Page 1 All Rights Reserved Produced in Canada Information is subject to change without notice. Nortel Networks reserves the right to make changes in design or components as progress in engineering and manufacturing may warrant. SL-1, Meridian 1, and Succession are trademarks of Nortel Networks.
Page 3 Page 3 of 210 Revision history September 2004 Standard 2.00. This document is up-issued for Communication Server 1000 Release 4.0. October 2003 Standard 1.00 This document is a new NTP for Succession 3.0. It was created to support a restructuring of the Documentation Library, which resulted in the merging of multiple legacy NTPs.
Page 4 Page 4 of 210 Revision history 553-3001-517 Standard 2.00 September 2004...
Page 5: Table Of Contents
Page 5 of 210 Contents About this document ..... . . Subject ..........Applicable systems .
Page 6 Page 6 of 210 Contents PRI status check ......... . PRI startup .
Page 7 Contents Page 7 of 210 Replace the clock controller ....... . . Clock controller cabling .
Page 8 Page 8 of 210 Contents System PRI maintenance tools ......2.0 Mb ISL maintenance ..... 207 Contents .
Page 9: About This Document
Page 9 of 210 About this document This document is a global document. Contact your system supplier or your Nortel Networks representative to verify that the hardware and software described are supported in your area. Subject This document provides maintenance procedures for ISDN Primary Rate Interface (PRI) capability on Meridian 1, CS 1000S, and CS 1000M systems.
Page 10 Page 10 of 210 About this document • Communication Server 1000M Multi Group (CS 1000M MG) • Communication Server 1000E (CS 1000E) • Meridian 1 PBX 11C Chassis (Meridian 1 PBX 11C Chassis) • Meridian 1 PBX 11C Cabinet (Meridian 1 PBX 11C Cabinet) •...
Page 11: Intended Audience
Communication Server 1000M and Meridian 1: Large System Upgrade Procedures (553-3021-258) • Communication Server 1000S: Upgrade Procedures (553-3031-258) Intended audience This document is intended for individuals responsible for maintaining ISDN PRI capability on Meridian 1, CS 1000S, and CS 1000M systems.
Page 12: Related Information
The following NTPs are referenced in this document: • Software Input/Output: System Messages (553-3001-411) • Software Input/Output: Maintenance (553-3001-511) Online To access Nortel Networks documentation online, click the Technical Documentation link under Support on the Nortel Networks home page: http://www.nortelnetworks.com/ 553-3001-517 Standard 2.00 September 2004...
Page 13 About this document Page 13 of 210 CD-ROM To obtain Nortel Networks documentation on CD-ROM, contact your Nortel Networks customer representative. ISDN Primary Rate Interface Maintenance...
Page 14 Page 14 of 210 About this document 553-3001-517 Standard 2.00 September 2004...
Page 15: Pri Fault Clearing
Page 15 of 210 PRI fault clearing Contents This section contains information on the following topics: PRI Red alarm (local alarm) ....... . . PRI Yellow alarm (remote alarm).
Page 16 Page 16 of 210 PRI fault clearing System software checks every 0-15 minutes (programmable) to see if a clock-controller or reference-clock error has occurred. If the 0-15 minute check finds the PRI in local alarm was a primary clock source, the software switches the clock controller to the secondary reference. Channel restoration When the alarm condition improves, the PRI is restored to service as follows: The local alarm is cleared.
Page 17 PRI fault clearing Page 17 of 210 Figure 1 PRI alarm timers Near end: Red alarm (local) detected Red alarm condition clear 2.5 ± 0.5 s Yellow alarm (remote) sent to far end Yellow alarm clear 50 ms 10.5 s ± 0.5 s Trunks taken out of service Trunks restored Far end:...
Page 18: Pri Yellow Alarm (Remote Alarm)
Page 18 of 210 PRI fault clearing PRI Yellow alarm (remote alarm) A remote alarm on the system indicates the far end is out of service. The fact that the PRI is receiving the remote-alarm pattern indicates that there is transmission integrity, but the far end is not ready.
Page 19: Pri Problems
PRI fault clearing Page 19 of 210 PRI problems The PRI can have any of the following problems. Determine the cause of the problem and follow the recommended actions provided in Table 2 on page ISDN Primary Rate Interface Maintenance...
Page 20 Page 20 of 210 PRI fault clearing Table 2 PRI problem solving (Part 1 of 2) Symptom Action No connection to far end. (If the 1.5 Mb/2Mb transmission cable is not Use the Error Counter to verify the physically connected to the far end, 1.5 Mb/2.0 Mb digital transmission directly frame-alignment errors occur.
Page 21 PRI fault clearing Page 21 of 210 Table 2 PRI problem solving (Part 2 of 2) Symptom Action Cannot enable the PRI. Two reasons follow: The far-end PRI is disabled, indicated by: Contact personnel at the far-end site to resolve the problem. •...
Page 22: D-Channel Problems
Page 22 of 210 PRI fault clearing D-channel problems D-channel problems are indicated when the D-channel Handler Interface (DCHI) releases after being enabled. This applies to both primary and backup D-channels. For example: Command Response Description LD 96 ENL DCH N DCH 1003 MDL error DCH 1006...
Page 23 PRI fault clearing Page 23 of 210 Procedure 3 D-channel status check Step Action Response Check the status of the D-channel's PRI. Clear any PRI problems. Contact the far end. If the far-end D-channel is down, the DCH1006 message is printed. Test the DCHI using tests 100, 101, 200 and 201 (the tests must be run in sequential order).
Page 24 Page 24 of 210 PRI fault clearing 553-3001-517 Standard 2.00 September 2004...
Page 25: Quick Reference To Pri Operations
Page 25 of 210 Quick reference to PRI operations Contents This section contains information on the following topics: PRI commands (LD 60) ........PRI messages.
Page 26: Pri Commands (Ld 60)
Page 26 of 210 Quick reference to PRI operations This chapter provides a quick-reference source for PRI maintenance operations. PRI commands (LD 60) Table 3 is a quick reference list of important PRI commands. For a more extensive list of PRI commands, see the section describing PRI maintenance. Table 3 PRI commands (quick reference) (Part 1 of 2) Command...
Page 27: Pri Messages
Quick reference to PRI operations Page 27 of 210 Table 3 PRI commands (quick reference) (Part 2 of 2) RMST loop Perform self-test on loop. RMST l ch Perform self-test on specified channel (2.0 Mb/s DTI/PRI only). RLBK loop Close loop at carrier interface point for testing. RLBK l ch Close channel ch at carrier interface point.
Page 28: D-Channel Commands (Ld 96)
Page 28 of 210 Quick reference to PRI operations D-channel commands (LD 96) Table 4 is a partial list of DCHI and D-channel commands. For a complete list of DCHI and D-channel commands, see the Software Input/Output: Maintenance (553-3001-511). Table 4 DCHI and D-channel commands (quick reference) (Part 1 of 3) Command Action...
Page 29 Quick reference to PRI operations Page 29 of 210 Table 4 DCHI and D-channel commands (quick reference) (Part 2 of 3) ENL MSGO x FEAT CPNW Enable outgoing monitoring for the Network CPNW ISDN messages on D Channel x. ENL SERV x Enable service messages on D-channel x.
Page 30: Dch Messages
Page 30 of 210 Quick reference to PRI operations Table 4 DCHI and D-channel commands (quick reference) (Part 3 of 3) STAT NCAL <DCH#> <conn_ID> List information pertaining to a specific call-independent connection. STAT MON (x) Display the incoming and outgoing monitoring status of one or all D-channels.
Page 31: Maintenance Service Messages
Quick reference to PRI operations Page 31 of 210 Table 5 MSDL D-channel commands (Part 2 of 2) ENL RLB x Enable remote loopback mode on MSDL DCH x ENL TEST x Enable TEST mode on MSDL DCH x PCON DCH x Print configuration parameters on MSDL DCH x PTRF DCH x Print traffic report on MSDL DCH x...
Page 32: Service Message Function
Page 32 of 210 Quick reference to PRI operations Near-end and far-end subcategories are defined for each maintenance status. See Table 6 for possible combinations of near and far-end status and the channel capability for each status. When the near-end status and far-end status do not match, the more severe maintenance status takes effect over the less severe maintenance status.
Page 33: Service Message Commands
Quick reference to PRI operations Page 33 of 210 D-channel sanity polling If a D-channel has been idle for 30 seconds, a service message is sent to poll the sanity of the link. The service message is sent regardless of whether the near end is configured as a master or a slave.
Page 34: Pri Status Check
Page 34 of 210 Quick reference to PRI operations PRI status check This status check is used to verify that a PRI is working normally. It assumes the PRI and DCHI are properly installed (for example, correctly cabled) and operational. If the PRI status is not as shown in the steps below, complete the check and proceed to PRI fault clearing procedures.
Page 35 Quick reference to PRI operations Page 35 of 210 Procedure 4 PRI status check (Part 2 of 3) Step Action Response Check the status of the DCHI port using: LD 96 STAT DCH x Check the status of all PRIs using: Sample response: LD 60 STAT (L) PRI LOOP L - ENBL...
Page 36 Page 36 of 210 Quick reference to PRI operations Procedure 4 PRI status check (Part 3 of 3) Step Action Response List PRI alarm counters using: PRI LOOP L LD 60 MNT NNDC NNC OOS LCNT (L) BVP- FAP- (Check the out-of-service counters to SLP- determine the number of out-of-service CRC-...
Page 37: Pri Startup
Quick reference to PRI operations Page 37 of 210 PRI startup This procedure provides the steps required to take the PRI and DCH from a disabled to an operational state. Procedure 5 PRI status check (Part 1 of 2) Step Action Response Check the status of all PRI cards.
Page 38: Network Call Trace
Page 38 of 210 Quick reference to PRI operations Procedure 5 PRI status check (Part 2 of 2) Step Action Response Enable all PRIs using: PRI000 Correct version ID LD 60 DTA005 remote alarm ENLL L DTA007 remote alarm cleared (provided the far end is DTA023 PRI loop is up...
Page 39: Enhanced Trace Command Output
Quick reference to PRI operations Page 39 of 210 A network call can be traced by dialing a Special Prefix (SPRE) code and the NCT feature code (9912) before the network number. When this is done, call setup and status information is output to the system terminal as the call tandems through the network.
Page 40: Trace A Call
Page 40 of 210 Quick reference to PRI operations Trace a call A call can be traced from any attendant console or a telephone with CLTA class of service. To trace a call, dial the following: SPRE + 9912 + xx + yyy... where SPRE = special function access code (defined in LD 15) 9912 = NCT feature code...
Page 41 Quick reference to PRI operations Page 41 of 210 FCI x—free calling area index FRL x—facility restriction level IFC xxx—outgoing D-channel interface (LD 17 prompt IFC) D100 = Meridian DMS-100 D250 = Meridian DMS-250 ESS4 = AT&T ESS4 ESS5 = AT&T ESS5 SL1 = Meridian SL-1 S100 = Meridian SL-100 SS12 = Norwegian SYS-12...
Page 42: Example 1: Successful Call With Trace Function 01
Page 42 of 210 Quick reference to PRI operations RING = call ringing SEIZ = trunk seized STYP xx—terminating station type 500 = single line telephone (LD 10) BCS = multi-line telephone (LD 11) ATT = attendant console (LD 12) TKTP TIE,COT,WAT...—incoming or outgoing trunk type TKTN loop ch, l s c u—incoming or outgoing B-channel, ISL trunk TN TN l s c u...
Page 43: Example 2: Unsuccessful Call With Trace Function 01
Quick reference to PRI operations Page 43 of 210 RTE 24 TKTP TIE TKTN 18 22 DGT 6000 --- STATE --- STAT PROC **** NCT # 22 **** NODE ORIG (SL1) SID 0 RLS 17 53 --- OUT --- DCH 5 RTE 24 TKTP TIE TKTN 18 22...
Page 44: Trace Function 02
Page 44 of 210 Quick reference to PRI operations Trace function 02 Call trace function 02 provides the information from the active (main) call register, the incoming call state, and the outgoing call state (if any). Trace function 02 is intended as a debugging tool for system designers. The information output by function 02 includes the following: NODE ORIG,TAND,TERM,TBD SID xxxx—system identifier...
Page 45: Feature Requirements
Quick reference to PRI operations Page 45 of 210 Feature requirements Network Call Trace is limited to basic ISDN PRI/ISL calls across system private networks. NCT collects information only during initial call setup. It does not report on further call modification, such as Call Transfer. Network call information is lost and the call trace ceases when any of the system nodes in which the call is being traced is initialized or any of the D-channels fails.
Page 46 Page 46 of 210 Quick reference to PRI operations 553-3001-517 Standard 2.00 September 2004...
Page 47: Primary Rate Interface Maintenance
Page 47 of 210 Primary Rate Interface maintenance Contents This section contains information on the following topics: PRI commands (LD 60) ........PRI alarm commands .
Page 48: Pri Commands (Ld 60)
Page 48 of 210 Primary Rate Interface maintenance PRI commands (LD 60) Primary Rate Interface (PRI) diagnostic commands are used to maintain both PRI and clock-controller operation. See Table 7 for a list of the PRI card and channel commands in LD 60. The commands are organized as follows: •...
Page 49 Primary Rate Interface maintenance Page 49 of 210 Table 7 PRI card and channel commands in LD 60 (Part 2 of 4) Command Description STAT loop Get status of digital loop. Sample output: AAA TRK LOOP x - BBBB SERVICE RESTORE: YES/NO YEL ALM PROCESS: YES/NO ALARM STATUS: NO ALARM/RED(local) ALARM Where: AAA may be:...
Page 50 Page 50 of 210 Primary Rate Interface maintenance Table 7 PRI card and channel commands in LD 60 (Part 3 of 4) Command Description IDLE = Hardware of specified digital loop is idle When AAA = TIE, IDLE ISPC indicates that the channel is an established ISPC link ready to be used by any end users having access to the associated ISPC route.
Page 51: Pri Alarm Commands
Primary Rate Interface maintenance Page 51 of 210 Table 7 PRI card and channel commands in LD 60 (Part 4 of 4) Command Description Where: SERVICE RESTORE may be: YES = restore service automatically if alarm is removed NO = loop can only be manually enabled Where: YEL ALARM PROCESS may be: YES = Yellow alarm processing is enabled NO = Yellow alarm processing is disabled...
Page 52 Page 52 of 210 Primary Rate Interface maintenance Table 8 PRI alarm commands in LD 60 (Part 2 of 3) Command Description LCNT L Prints content of all alarm counters of PRI loop L. The counters are: BPV Bipolar violation bit error rate counter. Indicates the number of times the loop has entered state due to excessive bipolar violations.
Page 53: Pri Test Commands
Primary Rate Interface maintenance Page 53 of 210 Table 8 PRI alarm commands in LD 60 (Part 3 of 3) Command Description RCNT L Resets all alarm counters of PRI loop L. PRI test commands See Table 9 for a list of the PRI test commands and a corresponding description of these commands.
Page 54: Pri Tests
Page 54 of 210 Primary Rate Interface maintenance Table 9 PRI test commands in LD 60 (Part 2 of 2) Command Description RMST L Performs self-test on loop L, providing the far end is in the remote loopback mode. RMST L CH Performs self-test on channel CH, providing the far end is in the remote loopback mode.
Page 55: Pri Automatic Loop Test
Primary Rate Interface maintenance Page 55 of 210 PRI automatic loop test The automatic loop test checks the same functions as the self-test. Unlike the self-test, the loop test can be run automatically, as part of the midnight routines. With the ATLP command set to one, follow Procedure 7. Procedure 7 PRI automatic loop test Step...
Page 56 Page 56 of 210 Primary Rate Interface maintenance Link diagnostic test The link-diagnostic test, also called the far-end loopback test, does not test the local PRI. It puts the PRI in loopback mode so a remote loopback test can be performed on equipment at the far end.
Page 57 Primary Rate Interface maintenance Page 57 of 210 Procedure 8 Remote loopback test (Part 2 of 2) Ask for loopback mode at that facility. When loopback mode at the far end is confirmed: Disable the DCHI using: LD 96 DIS DCH N Disable the PRI loop and run loopback test using: LD 60 DISL L...
Page 58: Pri Error Detection
Page 58 of 210 Primary Rate Interface maintenance PRI error detection Bit error rate Bit-error-rate monitoring detects errors in transmission. See Figure 3. Bipolar violation (BPV) tracking In a bipolar pulse stream, pulses alternate in polarity. A bipolar violation has occurred if, after transmission, two pulses of the same polarity are received in succession (this could be caused by an electrical disturbance such as noise).
Page 59: Bit Error Rate Thresholds
Primary Rate Interface maintenance Page 59 of 210 The CRC error counter is displayed with the LCNT L command in LD 60 provided that loop L has been defined with ESF as a framing format. The framing format (D2, D3, D4, or ESF) is selected in LD 17 when the loop is configured.
Page 60: Frame Slip
Page 60 of 210 Primary Rate Interface maintenance For example, if the default BIPV thresholds are used, DTA011 is output when the number of errors exceed 15.4 per second. DTA012 is output when the number of errors exceeds 154 per second. When the error rate improves two levels, the PRI is restored to service unless the 24-hour out-of-service counter was exceeded.
Page 61 Primary Rate Interface maintenance Page 61 of 210 Tracking mode There are two thresholds set in LD 73. When a threshold is reached, a DTA message is, as follows: DTA015: Maintenance limit for frame slips in tracking mode. DTA016: Out-of-service limit for frame slips in tracking mode. Figure 5 DTA messages DTA021—loss of frame alignment...
Page 62 Page 62 of 210 Primary Rate Interface maintenance DTA028: Slip rate improvement criterion is met. Trunks are brought back into service. Reset improvement timer. (Duration of timer selected in LD 73.) DTA029: Slip rate improvement criteria is met. Trunks being returned to service.
Page 63: Frame Alignment
Primary Rate Interface maintenance Page 63 of 210 Frame alignment Loss of frame alignment monitoring detects out-of-frame conditions on the DS-1 bit stream. See Figure 7. Loss of frame alignment thresholds PRI hardware detects out-of-frame conditions. Running the midnight routines prints the number of occurrences when frame alignment was lost and clears the counters.
Page 64 Page 64 of 210 Primary Rate Interface maintenance There are three frame alignment thresholds set in LD 73. When a maintenance or out-of-service threshold is reached, a DTA message is output as follows: DTA019: Frame alignment maintenance limit DTA020: Frame alignment out-of-service limit Figure 7 Frame alignment DTA 019—...
Page 65: Tn-To-Channel Number Conversion
Primary Rate Interface maintenance Page 65 of 210 If the loss of frame alignment condition clears for at least 15 seconds, the PRI is automatically restored to service. The following DTA message is generated: DTA021: Loss of frame alignment has persisted for 3 seconds. Figure 8 Frame alignment loss DTA021—loss of frame alignment...
Page 66 Page 66 of 210 Primary Rate Interface maintenance Terminal numbers are identified in software by Loop (L), Shelf (S), Card (C), and Unit (U) numbers. Each TN is applied to an individual channel on the PRI card. See Table 11. Table 11 PRI channel numbers and equivalent terminal numbers (Part 1 of 2) D3, D4,E SF format...
Page 67: Use The Error Counter
Primary Rate Interface maintenance Page 67 of 210 Table 11 PRI channel numbers and equivalent terminal numbers (Part 2 of 2) D3, D4,E SF format Channel number D2 format TN (S C U) TN (S C U) 2 8 0 2 4 0 0 4 0 2 5 0...
Page 68 Page 68 of 210 Primary Rate Interface maintenance Procedure 9 Using the error counter CAUTION To prevent injury from voltage on the span, always connect the patch cord into the test set before connecting the other end to the external signal source.
Page 69 Primary Rate Interface maintenance Page 69 of 210 Monitor the error counter LED indicators as described in Table 12 and Table 13. Table 12 Error counter switch functions Switch Function Display Enable When held down, the switch enables the counter display and the GOOD and O/R LED displays.
Page 70: Replace The Pri
Page 70 of 210 Primary Rate Interface maintenance Replace the PRI Procedure 10 Replacing the PRI circuit card CAUTION Firmly touch the metal frame of the cabinet to discharge static electricity from your body before handling circuit cards. Disable the D-channel using the following: LD 96 DIS DCH x Disable the PRI loop using the following:...
Page 71: Pulsed E&M Dti2 Signaling
Primary Rate Interface maintenance Page 71 of 210 Pulsed E&M DTI2 signaling Error messages DTA322 loop channel start-bits pulsed-bits end-bits duration An invalid pulsed signal has been received from the DTI. loop = the loop number the signal was received on channel = the channel number the signal was received on start-bits = the bit pattern before analysis of the pulse pulsed-bits = the ABCD bit pattern which was possibly part of a pulsed...
Page 72: Diagnostics
Page 72 of 210 Primary Rate Interface maintenance loop = the loop number of the trunk which sent the forward release channel = the channel number of the trunk which sent the forward release. DTA205 loop e The CI-1 firmware has encountered a problem. Refer to DTIOO9 for CI-1 microprocessor error codes (e).
Page 73: D-Channel Maintenance
Page 73 of 210 D-channel maintenance Contents This section contains information on the following topics: DCH commands (LD 96) ........DCH tests .
Page 74: Dch Commands (Ld 96)
Page 74 of 210 D-channel maintenance DCH commands (LD 96) Table 14 contains the basic D-channel (DCH) commands in LD 96. Table 14 D-channel commands, LD 96 (Part 1 of 5) Command Description DIS AUTO x Disable automatic recovery for DCH x. DIS DCH x Disable DCH x.
Page 75 D-channel maintenance Page 75 of 210 Table 14 D-channel commands, LD 96 (Part 2 of 5) Command Description DIS MSGO <dch> debg CH <loop><channel> Disable the debugging of all monitored outgoing messages from D-channel card. A maximum of 5 channels are monitored at a time. Only one channel number can be entered in one command.
Page 76 Page 76 of 210 D-channel maintenance Table 14 D-channel commands, LD 96 (Part 3 of 5) Command Description ENL MSGI <dch> debg CH <loop><channel> Enable the debugging of all monitored incoming messages from D-channel card. A maximum of 5 channels are monitored at a time. Only one channel number can be entered in one command.
Page 77 D-channel maintenance Page 77 of 210 Table 14 D-channel commands, LD 96 (Part 4 of 5) Command Description ENL MSGO <dch> debg MSG msg1 msg2 msg3 Enable the debugging of all monitored outgoing messages from D-channel. This command can be entered more than once. Only 3 message mnemonics can be given in one command.
Page 78: Dch Tests
Page 78 of 210 D-channel maintenance Table 14 D-channel commands, LD 96 (Part 5 of 5) Command Description SET MSGO x MON (0)-2 Set monitor output format level for outgoing messages on D-channel x. SLFT TMDI x Invoke self-test x STAT DCH (x) Get status of one or all D-channels STAT ISPC l ch...
Page 79 D-channel maintenance Page 79 of 210 The DCH tests 100 and 101 are hardware tests, while the 200 and 201 test the DCH software. DCH tests 100 and 101 DCH tests 100 and 101 are isolated hardware tests. See Figure 10 on page 80.
Page 80 Page 80 of 210 D-channel maintenance Figure 10 DCH tests 100 and 101 INTERRUPT SIGNAL Meridian SL-1 DCHI Command Register Transmit Buffer D-Channel Firmware Maintenance Receive Overlay Buffer Status Register TEST 100: Interrupt generation Meridian SL-1 DCHI Command Register Transmit Buffer Receive Buffer...
Page 81 D-channel maintenance Page 81 of 210 DCH tests 200 and 201 DCH tests 200 and 201 are software tests. See Figure 11 on page 82. Test 200 monitors the DCHI interrupt handler. Test 201 checks the interrupt handler-to-link interface path. If either test fails, software problems are indicated.
Page 82 Page 82 of 210 D-channel maintenance Figure 11 DCH tests 200 and 201 Interrupt signal Large system Meridian SL-1 DCHI Interrupt DCHI Interrupt Handler TEST 200: Interrupt handler Input Buffer DCHI Work Interrupt Scheduler Handler Interface Event Handler TEST 201: Interrupt handler-to-link interface 553-1382 553-3001-517 Standard 2.00...
Page 83: Dch Traffic (Ld 2)
D-channel maintenance Page 83 of 210 DCH traffic (LD 2) Traffic report TFS009 provides accumulated D-channel statistics. This report can be included in the scheduled traffic report, or printed on demand as described below. To enable D-channel measurement in the scheduled traffic reports, use the Set System Traffic Options (SOPS) command.
Page 84 Page 84 of 210 D-channel maintenance Table 15 TFS009 D-channel report format (Part 2 of 2) ffff ssss gggg hhhh tttt iiii jjjj uuuu yyyy kkkk (MSDL only) vvvv (MSDL only) llll (MSDL only) wwww (MSDL only) mmmm (MSDL only) xxxx (MSDL only) tat1 (MSDL only) tat2 (MSDL only)
Page 85 D-channel maintenance Page 85 of 210 Table 16 Legend for TFS0009 report (Part 2 of 4) eeee average number of incoming bytes per message ffff accumulated real time a D-channel was busy transferring incoming messages in half-millisecond units (Divide the reported number by 2 for a result in milliseconds.
Page 86 Page 86 of 210 D-channel maintenance Table 16 Legend for TFS0009 report (Part 3 of 4) ssss accumulated real time a D-channel was busy transferring outgoing messages in half-millisecond units (Divide the reported number by 2 for a result in milliseconds. For example: divide a reported number of 200 by 2 for a result of 100 milliseconds.) tttt number of times a message with no End of Message (EOM) mark was...
Page 87: Msdl Local Loopback Test (Nt6D80)
D-channel maintenance Page 87 of 210 Table 16 Legend for TFS0009 report (Part 4 of 4) DIV_NEW number of optimization successful with the diversion trigger: a new path is used DIV_OLD number of optimization successful with the diversion trigger but the old path has been retained FLOW To prevent any application from tying up buffer resources due to its...
Page 88 Page 88 of 210 D-channel maintenance To start the local loopback test on the Multi-purpose Serial Data Link (MSDL) card, use the x command, where x is the logical DCH ENL LLB number. Then perform the following test: TEST LLB x The test checks both MSDL expedited and normal (ring) interfaces.
Page 89 D-channel maintenance Page 89 of 210 Figure 12 Local loopback test (NT6D80) System software DCH Handler MSDL Handler CPU Bus MSDL card software Interface Module (Base Code) Loopback path MSDL DCH software Physical Layer (Layer 1) Handler (PRI trunk) ISDN Primary Rate Interface Maintenance...
Page 90: Msdl Remote Loopback Tests (Nt6D80)
Page 90 of 210 D-channel maintenance MSDL remote loopback tests (NT6D80) Before beginning this test, verify the following: • D-channels on both switches are configured on MSDL cards • DCH links on both switches are set to TEST mode • DCH at Switch B is in remote loopback mode (RLB) •...
Page 91 D-channel maintenance Page 91 of 210 If the card passed the test, the problem may lie in incompatible software. Refer to Circuit Card: Description and Installation (553-3001-211). After the test is complete, remove both sides from the test state: DIS TEST x DIS TEST y End of Procedure See Figure 13 on...
Page 92 Page 92 of 210 D-channel maintenance Figure 13 Remote loopback tests (NT6D80) Switch A Switch B System System software software DCH Handler DCH Handler MSDL card MSDL card MSDL Handler MSDL Handler software software System System CPU Bus CPU Bus System Interface System Interface Module...
Page 93: Protocol Log (Plog)
D-channel maintenance Page 93 of 210 Protocol log (PLOG) The count of D-channel errors is stored in the Protocol Log (PLOG). The PLOG is printed by using LD 96 as shown in the PLOG status check below. Protocol errors can be the result of: •...
Page 94 Page 94 of 210 D-channel maintenance If there is no problem with the PRI but there are a large number of protocol errors, report a protocol problem. End of Procedure Table 17 Protocol log (Part 1 of 3) Format DCH : XX MAINT CONFIRM TIME: <time of day> COUNTERVALUE Protocol counters count of missing PRI handshakes...
Page 95 D-channel maintenance Page 95 of 210 Table 17 Protocol log (Part 2 of 3) count of layer 1 reports of no external clock being received count of aborted frames count of SABME frames received with incorrect C/R bit count of supervisory frames received with F = 1 count of unsolicited DM responses with F = 1 count of unsolicited UA responses with F = 1 count of unsolicited UA responses with F = 0...
Page 96 Page 96 of 210 D-channel maintenance Table 17 Protocol log (Part 3 of 3) count of layer 3 messages from system containing an undefined message type count of layer 3 messages from system missing mandatory IE(s) count of layer 3 messages from system containing unsupported IE(s) count of layer 3 messages from system containing invalid operational IE(s) count of layer 3 messages from system containing invalid mandatory IE(s) count of layer 3 messages from system with IE(s) out of order...
Page 97: Replace The Dchi
D-channel maintenance Page 97 of 210 Replace the DCHI CAUTION Firmly touch the metal frame of the cabinet to discharge static electricity from your body before handling circuit packs. Procedure 15 Replacing the DCHI Step Action Disable the D-channel using: LD 96 DIS DCH N Disable the asynchronous port on the DCHI card (if equipped) using:...
Page 98: Ld 60 - Loop Maintenance For Sys-12, Axe-10, Swe, Swissnet, Numeris, Euroisdn, Neax-61, Asia-Pacific
Page 98 of 210 D-channel maintenance LD 60 - Loop Maintenance for SYS-12, AXE-10, SWE, SWISSNET, NUMERIS, EuroISDN, NEAX-61, Asia-Pacific If there is a loop configured with a SYS-12, AXE-10, SWE, SWISSNET, NUMERIS, EuroISDN, NEAX-61, or Asia-Pacific D-channel, LD 60 adds the D-channel type to the printout displayed upon entering the overlay.
Page 99: Clock Controller Maintenance
Page 99 of 210 Clock controller maintenance Contents This section contains information on the following topics: Clock operation ......... . . Tracking mode .
Page 100 Page 100 of 210 Clock controller maintenance As shown in Figure 14, a system with a dual CPU can have two clock con- trollers (CC0 and CC1). One clock controller acts as a backup to the other. The clock controllers should be locked to the reference clock. Figure 14 Clock controller primary and secondary tracking Clock...
Page 101 Clock controller maintenance Page 101 of 210 • the primary and secondary references are disabled • the primary and secondary references are in local alarm Reference clock errors System software checks every 0-15 minutes (programmable) to see if a clock-controller or reference-clock error has occurred. In tracking mode, at any one time, there is one active clock controller which is tracking on one reference clock.
Page 102: Clock Controller Commands (Ld 60)
Page 102 of 210 Clock controller maintenance Note: If the system was put into free-run mode intentionally by the craftsperson, it resumes tracking on a reference clock at this time. This occurs unless the clock-switching option has been disabled (LD 60, command MREF), or the reference clock has been “undefined”...
Page 103 Clock controller maintenance Page 103 of 210 Table 19 Clock controller commands in LD 60 (Part 2 of 2) Command Description MREF Disables automatic switching and recovery of the primary and secondary reference clocks when loops associated with these clocks are automatically disabled or in local alarm.
Page 104: Replace The Clock Controller
Page 104 of 210 Clock controller maintenance Replace the clock controller Task summary list The following is a summary of the tasks in this section: Replace the clock controller. Refer to Procedure 16 on page 104. CAUTION Firmly touch the metal frame of the cabinet to discharge static electricity from your body before handling circuit packs.
Page 105 Clock controller maintenance Page 105 of 210 Procedure 16 Replacing the clock controller (Part 2 of 2) Step Action Set the ENB/DIS switch to DIS on the clock-controller card being added. Make sure that the switch settings are correct. Install new clock-controller card in same slot as the defective card. Reconnect cable(s) to clock-controller faceplate.
Page 106: Clock Controller Cabling
Page 106 of 210 Clock controller maintenance Set switches Before installing a clock controller, set the switches as shown in Tables 20 and 21. Table 20 displays the settings for different vintages of the QPC471. Table 21 shows the settings for the QPC775. Table 20 Clock controller switch settings for QPC471 vintage H System...
Page 107 Clock controller maintenance Page 107 of 210 Figure 15 Clock controller cabling: Half Group systems NT8D79AA to PRI Card (Secondary reference) NT8D72AA PRI Card (Primary reference) NT8D79AA REF1 QPC471 Clock Controller No connection REF2 No connection QCAD328A QPC757 D-CH DCHI NT8D85AB Network LOOP...
Page 108 Page 108 of 210 Clock controller maintenance Figure 16 Clock controller cabling: Single Group systems NT8D79AA to PRI Card (Secondary reference) NT8D72AA NT8D79AA PRI Card NT8D79AA (Primary reference) NT8D79AA QPC775 REF1 Clock Controller NT8D79AA REF2 QPC775 Clock Controller QCAD125 QCAD328A QPC757 D-CH DCHI...
Page 109 Clock controller maintenance Page 109 of 210 Figure 17 Clock controller cabling Multi Group systems QCAD130 to PRI Card PRI Card (Secondary reference) (Primary reference) QCAD130 QPC471 REF1 Clock Controller SCG0 QPC417 QCAD110 Junctor SCG1 QCAD130 QPC471 REF2 Clock Controller QCAD328A to DCHI or NTND26 to MSDL D-CH...
Page 110 Page 110 of 210 Clock controller maintenance 553-3001-517 Standard 2.00 September 2004...
Page 111: Isdn Signaling Link Maintenance
Page 111 of 210 ISDN Signaling Link maintenance Contents This section contains information on the following topics: ISL status formats ......... Print programs (LD 20, 21, 22) .
Page 112 Page 112 of 210 ISDN Signaling Link maintenance The display format is the same for both programs. See Table 22. Table 22 ISL status check in LD 32 and 36 Command Response STAT L S C UNIT 00 = IDLE ISL TRK D-CH <ch #>...
Page 113: Isl Startup
ISDN Signaling Link maintenance Page 113 of 210 • LD 21 prints route information • LD 22 prints configuration record information Table 24 ISL prompts in LD 20, LD 21, and LD 22 Program Prompt Description LD 20 CHID nn Channel ID LD 21 MODE ISL/PRI...
Page 114: Isl Recovery
Page 114 of 210 ISDN Signaling Link maintenance Dedicated D-channel using DTI or PRI When the D-channel is configured in the dedicated mode using a DTI or PRI trunk, an Asynchronous Data Module (ADM), an Asynchronous/ Synchronous Interface Module (ASIM), or a High Speed Data Module (HSDM) is required between the DCHI or MSDL cards and the Data Line Card (DLC).
Page 115 ISDN Signaling Link maintenance Page 115 of 210 The system handles these possibilities in the following way: The system CPU schedules a data link diagnostics program, which runs in background mode. If this program finds that the link is not established, it requests the maintenance program to reestablish the data link by reinitializing the hotline connection.
Page 116 Page 116 of 210 ISDN Signaling Link maintenance 553-3001-517 Standard 2.00 September 2004...
Page 117: 1.5 Mb Dti/Pri Maintenance
Page 117 of 210 1.5 Mb DTI/PRI maintenance Contents This section contains information on the following topics: Overview ..........Monitor DTI/PRI operation.
Page 118: Monitor Dti/Pri Operation
Page 118 of 210 1.5 Mb DTI/PRI maintenance Monitor DTI/PRI operation Maintenance messages The following sections describe the maintenance messages that may appear on the system maintenance TTY as a result of DTI or PRI operation. D-channel status and error conditions are reported as DCH messages. PRI status and error conditions are shown in Table 26.
Page 119 1.5 Mb DTI/PRI maintenance Page 119 of 210 The status reported by the service and service acknowledge messages for B- channels and ISL channels are: • in-service • maintenance • out-of-service Near-end and far-end sub-categories are defined for each maintenance status. See Table 27 for possible combinations of near-end and far-end statuses, and the channel capability for each status.
Page 120 Page 120 of 210 1.5 Mb DTI/PRI maintenance • B-channel or ISL channel status change • Channel status audit D-channel establishment When the D-channel establishes, the B-channel status is supported by sending service messages for each B-channel controlled by a D-channel. This messaging allows the far end to synchronize its channel states.
Page 121 1.5 Mb DTI/PRI maintenance Page 121 of 210 Activating service messages Activate the service messages in LD 96 on a per D-channel basis. The backup D-channel (if equipped) automatically operates in the same mode as the primary D-channel. The commands are listed in Table 28. Table 28 D-channel messages Command...
Page 122: Dti/Pri Maintenance Tools
Page 122 of 210 1.5 Mb DTI/PRI maintenance Each time a Yellow alarm is generated, a counter is incriminated. When the Yellow alarm 24-hour threshold (prompt RALM in LD 73) is reached, the PRI/DTI circuit card must be restored to service manually. DTI/PRI Red alarm (local alarm) A Red alarm (local alarm) indicates that the digital trunks or B-channels have been taken out-of-service (OOS) due to a loss of frame alignment lasting...
Page 123 1.5 Mb DTI/PRI maintenance Page 123 of 210 WARNING Extreme care must be taken when enabling the D- channel message monitoring option due to the possible heavy volume of messages during normal traffic. Use this command only during very light or no traffic conditions for trouble-shooting purposes.
Page 124 Page 124 of 210 1.5 Mb DTI/PRI maintenance Table 30 D-channel commands (LD 96) (Part 1 of 2) Command Action DIS DCH N Disable DCHI port N. DIS MSGI N Disable monitoring of incoming D-channel messages on link N. Monitor remains active until disabled.
Page 125 1.5 Mb DTI/PRI maintenance Page 125 of 210 Table 30 D-channel commands (LD 96) (Part 2 of 2) Command Action STAT MSGO (N) Print outgoing message monitor status. TEST-100/101/200/201 See DCH tests in NTP. STAT SERV Print the current service and service acknowledge message for DCHI N.
Page 126 Page 126 of 210 1.5 Mb DTI/PRI maintenance Table 31 Downloadable D-channel (DDCH) commands (LD 96) (Part 2 of 2) Command Action PMES DCH X Print incoming layer 3 messages on MSDL DCH X. PTRF DCH X Print traffic report on MSDL DCHX. TEST LLB X Start local loop back test on MSDL DCH X.
Page 127 1.5 Mb DTI/PRI maintenance Page 127 of 210 Table 32 TMDI maintenance commands (Part 2 of 2) Command Description ENL TMDI x (FDL) Enable TMDI card x and force a download. This command only works if TMDI is disabled (loop also disabled). It attempts to force download all required applications to TMDI card and then re-enable the card.
Page 128 Page 128 of 210 1.5 Mb DTI/PRI maintenance D-channel monitoring on the TMDI card Table 33 D-channel monitoring commands Command Action DIS TMDI x MSGI Disable monitoring of incoming D-channel messages on TMDI card x. DIS TMDI x MSGO Disable monitoring of outgoing D-channel messages on TMDI card x.
Page 129 1.5 Mb DTI/PRI maintenance Page 129 of 210 Table 34 Clock controller commands (LD 60) (Part 2 of 2) Command Action SSCK N Status of clock controller N. TRCK XXXX N Set clock controller tracking. Where xxxx = PCK = Track primary clock reference source. SCLK = Track secondary clock reference source.
Page 130 Page 130 of 210 1.5 Mb DTI/PRI maintenance NTAK20 power on self-test The clock controller daughterboard LED is the second LED from the bottom on the faceplate of the NTAK09 DTI/PRI card. When power is applied to the NTAK20 clock controller, the LED is initially off for two seconds.
Page 131 1.5 Mb DTI/PRI maintenance Page 131 of 210 Procedure 17 Self-testing the DTI/PRI card To perform a self-test on the entire DTI/PRI card: Enter the following command in LD 96 to disable the DCHI: DIS DCH N Enter the following command in LD 60 to disable the DTI/PRI card and run the self-test: DISL C SLFT C (entire card)
Page 132 Page 132 of 210 1.5 Mb DTI/PRI maintenance Remote loopback and remote self-test The remote loopback and the remote self-test are performed manually per loop (or per system card). Remote loopback The RLBK C command puts the DTI/PRI into loopback toward the far end so a remote self-test can be performed on equipment at the far end.
Page 133 1.5 Mb DTI/PRI maintenance Page 133 of 210 To run the remote self-test (external loopback test) through a loopback on the far-end system: Call a technician at the far end. Ask for remote loopback mode on the facility to be tested. When loopback mode at the far end is confirmed, enter the following command in LD 96 to disable the DCHI (for PRI DCHL or BCHL): DIS DCH N...
Page 134 Page 134 of 210 1.5 Mb DTI/PRI maintenance Figure 18 DTI/PRI link diagnostic and remote loopback tests Near-end Switch Far-end Switch NTAK09 NTAK93 RMST L RLBK L Running remote In loop-back mode loop-back test Link Diagnostic test) Note: The remote loop-back Note: The switch must be test cannot be performed put into link diagnostic...
Page 135 1.5 Mb DTI/PRI maintenance Page 135 of 210 DTI/PRI error detection Bit error rate Bit error rate monitoring detects errors in transmission (see Figure 19). There are two methods of bit error monitoring: bipolar violation tracking and Cyclic Redundancy Check (CRC). If the D2, D3, or D4 framing format is selected in LD 17 prompt DLOP, then bipolar violation tracking is implemented.
Page 136 Page 136 of 210 1.5 Mb DTI/PRI maintenance Cyclic Redundancy Check The ESF contains a checksum of all data in the frame. The receiving side uses the checksum to verify the data. The primary difference between BPV and cyclic redundancy check (CRC) is that bipolar violation tracking indicates errors in the local span, while CRC indicates errors on an end-to-end span.
Page 137 1.5 Mb DTI/PRI maintenance Page 137 of 210 Figure 20 BIPV and BIPC thresholds DTA 011--maintenance threshold A warning message is printed BIPV 1-(3)-4 1-(2)-4 DTA 012--out-of-service threshold The PRI is taken out of service and red alarm (local alarm) is raised. The PRI is restored automatically when performance improves (indicated by DTA 014)
Page 138 Page 138 of 210 1.5 Mb DTI/PRI maintenance Frame slip Digital signals must have accurate clock synchronization for data to be interleaved into, or extracted from, the appropriate timeslot during multiplexing and de-multiplexing operations. A frame slip is defined as the repetition or deletion of the 193 data bits of a DS-1 frame due to a sufficiently large discrepancy in the read and write rates at the buffer (clocks aren't operating at exactly the same speed).
Page 139 1.5 Mb DTI/PRI maintenance Page 139 of 210 Types of synchronization Clock synchronization can be either tracking on the primary or secondary reference clock or free run (non-tracking). In LD 73 (prompts PREF and SREF), the DTI/PRI which supports the clock controller daughterboard is defined as the primary clock reference.
Page 140 Page 140 of 210 1.5 Mb DTI/PRI maintenance Figure 21 Frame slip tracking thresholds DTA 015--maintenance threshold A warning message is printed SRTK 1-(5)-24 1-(30)-3600 DTA 016--out-of-service threshold. The PRI is taken out of service and red alarm (local alarm) is raised. The Slip Rate Improvement monitoring (SRIM and SRMM) will be invoked.
Page 141 1.5 Mb DTI/PRI maintenance Page 141 of 210 Free run (non-tracking) mode A maintenance threshold and an out-of-service threshold are set in LD 73 as described below. Also, see Figure 22 on page 142 for additional information. LD 73 — SRNT prompt Prompt Response Description...
Page 142 Page 142 of 210 1.5 Mb DTI/PRI maintenance Figure 22 Frame slip non-tracking thresholds DTA 017--maintenance thresholdA warning message is printed SRNT 1-(15)-1024 1-(3)-1024 DTA 018--out-of-service threshold.The PRI is taken out-of-service and red alarm (local alarm) is raised.The Slip Rate Improvement (SRIM and SRMM) monitoring is invoked.
Page 143 1.5 Mb DTI/PRI maintenance Page 143 of 210 There are two thresholds set in LD 73 as described in Table 38. LD 73 — SRIM and SRMM prompts Prompt Response Description SRIM (1)-127 Slip Rate Improvement time in minutes. After the tracking or non-tracking mode frame slippage out-of-service threshold is exceeded, the slip rate is monitored for improvement.
Page 144 Page 144 of 210 1.5 Mb DTI/PRI maintenance Table 38 Frame slip improvement timers (Part 2 of 2) DTA 029 - Frame slip improvement timer has expired, Slip Rate Improvement Criteria has been met. Trunks are being returned to service. SRMM 1-(2)-127 Frame alignment...
Page 145 1.5 Mb DTI/PRI maintenance Page 145 of 210 There are three frame alignment thresholds set in LD 73. When a maintenance or out-of-service threshold is reached, a DTA message is output as shown in Figure 23. Table 39 DTA message output DTA019 Frame alignment maintenance limit.
Page 146 Page 146 of 210 1.5 Mb DTI/PRI maintenance If a loss of frame alignment condition persists for three seconds, the affected DTI/PRI card is taken out-of-service and a Red alarm (local alarm) is raised. See Figure 24. If the loss of frame alignment condition clears at least 15 seconds, the DTI/ PRI is automatically restored to service.
Page 147 1.5 Mb DTI/PRI maintenance Page 147 of 210 Tracking mode In tracking mode, one or possibly two DTI/PRI cards supply a clock reference to a clock controller daughterboard. When operating in tracking mode, one DTI/PRI is defined as the primary reference source for clock synchronization, while the other is defined as the secondary reference source (PREF and SREF in LD 73).
Page 148 Page 148 of 210 1.5 Mb DTI/PRI maintenance Reference clock errors System software checks every 15 minutes to see if a clock controller or reference clock error has occurred. In tracking mode, the clock controller tracks on one reference clock. If a clock controller error is detected, or if there is a problem with the reference clocks, the system switches to free-run mode.
Page 149 1.5 Mb DTI/PRI maintenance Page 149 of 210 Note: EREF and MREF commands in LD 60, which control the enabling and disabling of automatic clock recovery, are not supported on the system. Procedure 19 Replacing equipment Use the following procedure before reseating any one or more of the following: the NTAK09, the NTAK20, or the NTAK93.
Page 150 Page 150 of 210 1.5 Mb DTI/PRI maintenance Figure 26 Wrist strap connection to the cabinet INTER J1 J2 J4 J5 J6 J7 J8 J9 J10 wrist strap 553-8289.EPS To remove the NTAK20 Clock Controller daughterboard, grasp the NTAK20 at opposite corners and gently “wiggle” it back and forth until all four corners are free.
Page 151: 1.5 Mb Isl Maintenance
Page 151 of 210 1.5 Mb ISL maintenance Contents This section contains information on the following topics: Overview ..........ISL maintenance tools.
Page 152 Page 152 of 210 1.5 Mb ISL maintenance D-channel status and error conditions are reported as DCH messages. PRI status and error conditions are reported in the messages found in Table 41. Additional information on DCH and PRI messages can be found in the Software Input/Output: System Messages (553-3001-411).
Page 153 1.5 Mb ISL maintenance Page 153 of 210 Service and service acknowledge messages for B-channels and ISL channels report the following status types: • in-service • maintenance • out-of-service Near-end and far-end sub-categories are defined for each maintenance status. See Table 42 for possible combinations of near-end and far-end status and the channel capability for each status.
Page 154 Page 154 of 210 1.5 Mb ISL maintenance D-channel establishment When the D-channel establishes, the B-channel status is supported by sending service messages for each B-channel controlled by a D-channel. This allows the far end to synchronize its channel states. These services messages are sent when the D-channel is brought up automatically by the system or manually in LD 96.
Page 155: Isl Maintenance Tools
1.5 Mb ISL maintenance Page 155 of 210 Activate service messages Activate the service messages in LD 96 on a D-channel basis. The commands are listed in Table 43. Table 43 D-channel messages Command Description ENL SERV N Turns on the support of service and service acknowledge messages for DCH link N.
Page 156 Page 156 of 210 1.5 Mb ISL maintenance IMPORTANT! Extreme care must be taken when enabling D-channel message monitoring option due to the possible heavy volume of messages during normal traffic. Use this command only during very light or no traffic conditions for trouble-shooting purposes.
Page 157 1.5 Mb ISL maintenance Page 157 of 210 Table 44 D-channel commands (LD 96) (Part 2 of 2) Command Action RST DCH N Reset D-channel N. STAT DCH (N) Print D-channel status (link status). STAT MSGI (N) Print incoming message monitor status. STAT MSGO (N) Print outgoing message monitor status.
Page 158 Page 158 of 210 1.5 Mb ISL maintenance Figure 27 ISL back-to-back connection Port 1, DCHI Y NTAK02 Port 3, DCHI X In LD 17: DCHI X DCHI Y INTERNAL CLOCK EXTERNAL CLOCK SLAVE MASTER 553-8293 553-3001-517 Standard 2.00 September 2004...
Page 159: 2.0 Mb Dti Maintenance
Page 159 of 210 2.0 Mb DTI maintenance Contents This section contains information on the following topics: Overview ..........Replacing the NTAK10 2.0 Mb DTI circuit card .
Page 160 Page 160 of 210 2.0 Mb DTI maintenance Procedure 20 Replacing the NTAK10 2.0 Mb DTI circuit card To replace a DTI circuit pack, follow the procedure below: Enter the following command in LD 60 to software disable the NTAK10 2.0 Mb DTI card(s): DISL N Where N is the 2.0 Mb DTI card number.
Page 161: Monitor System Dti Operation
2.0 Mb DTI maintenance Page 161 of 210 ENLL N Where N is the 2.0 Mb DTI card number. Enter the following command in LD 60 to software enable the clock controller: ENL CC 0 Enable clock tracking on primary digital loop by issuing the following command: TRCK PCK End of Procedure...
Page 162 Page 162 of 210 2.0 Mb DTI maintenance Grade-of-service messages Grade-of-Service messages (DTA XXX) provide near-end and far-end switch status. A summary of these status messages is given in Table 46. Table 46 Grade-of-service messages Status 2.0 Mb DTI capability Acceptable Both incoming and outgoing calls allowed...
Page 163 2.0 Mb DTI maintenance Page 163 of 210 Group II alarm types are listed from high to low priority. A Group II alarm type might not be reported when a greater type is detected. Alarm Indication Signal (AIS) — Far-end alarm Loss of Frame Alignment Signal (LFAS) —...
Page 164 Page 164 of 210 2.0 Mb DTI maintenance The primary difference between BPV and CRC is that bipolar violation tracking indicates errors in the local span, while CRC indicates errors on an end-to-end span. For example, on a satellite link, BPV detects errors only in the span between the system and the satellite connection.
Page 165 2.0 Mb DTI maintenance Page 165 of 210 Clock synchronization can be tracking, on the primary or secondary reference clock, or non-tracking (free-run). In LD 73 (prompts PREF and SREF), the 2.0 Mb DTI which supports the active clock controller is defined as the primary clock reference.
Page 166 Page 166 of 210 2.0 Mb DTI maintenance Alarm Indication Signal 64 Kilobit (AIS64). There are specific AIS requirements for CNET (France). The first requirement relates to the transmission of AIS in TS16. In that case, all “ones” should be transmitted in the event that abcd signaling is not supported.
Page 167 2.0 Mb DTI maintenance Page 167 of 210 Remote Yellow alarm (B6). Bit 6 of TS16 in Frame 0 is “1”. This alarm occurs when the far end has detected a loss of MFA. Alarm threshold recommendations for digital trunks If a digital trunk is present in an IP expansion cabinet/Media Gateway 1000S (MG 1000S), link outages due to data network degradation between a main cabinet/Call Server and an expansion cabinet/MG 1000S cause alarms on the...
Page 168: System Dti Maintenance Tools
Page 168 of 210 2.0 Mb DTI maintenance Table 48 NTAK10 faceplate LEDs (Part 2 of 2) State Definition No far-end alarm. On (Yellow) NTAK10 2.0 Mb DTI is in loopback mode. NTAK10 2.0 Mb DTI is not in loopback mode.
Page 169 2.0 Mb DTI maintenance Page 169 of 210 DTI commands Below is a quick reference list of important 2.0 Mb DTI commands in LD 60. LD 60 — DTI commands Command Action DLBK L Disable loopback mode for 2.0 Mb DTI. RLBK L Enable loopback mode for 2.0 Mb DTI.
Page 170 Page 170 of 210 2.0 Mb DTI maintenance LD 60 — Clock controller commands (Part 2 of 2) Command Action TRCK XXX Set clock controller tracking. XXX can be: - PCK = track primary clock - SCLK = track secondary clock - FRUN = free run mode Track primary clock (PCK) or secondary clock (SCLK) as the reference clock or go to free run (FRUN) mode.
Page 171 2.0 Mb DTI maintenance Page 171 of 210 SLFT L CH (for a specific channel For self-testing individual channels, follow the same procedure as above, but use the following commands: DSCH C CH SLFT C CH (specific channel) End of Procedure The self-test failure codes for NTAK10 2.0 Mb DTI are outlined in Table 49.
Page 172 Page 172 of 210 2.0 Mb DTI maintenance Table 49 Self-test failure codes for NTAK10 2.0 Mb DTI (Part 2 of 6) 09 = NI priority MESSIN queue is full. 10 = Bad MESSOUT number 10 encountered. 11 = TN = 0 read from regular queue. 12 = TN = 0 read from priority queue.
Page 173 2.0 Mb DTI maintenance Page 173 of 210 Table 49 Self-test failure codes for NTAK10 2.0 Mb DTI (Part 3 of 6) 128 = Message received by CI-1 through FIFO requested an undefined task. 129 = Request for a timed two-state pulse was received, with the TN of TS 0 or 16.
Page 174 Page 174 of 210 2.0 Mb DTI maintenance Table 49 Self-test failure codes for NTAK10 2.0 Mb DTI (Part 4 of 6) 143 = CI-2 micro responded to echo request message but response was in error. 144 = CI-2 micro failed to respond to request echo message.
Page 175 2.0 Mb DTI maintenance Page 175 of 210 Table 49 Self-test failure codes for NTAK10 2.0 Mb DTI (Part 5 of 6) DTI009C ch DTI009 error codes for CI microprocessor (M=C): 157 = CI-1, NI FIFO overflowed, and has been cleared. 128 message were lost.
Page 176 Page 176 of 210 2.0 Mb DTI maintenance Table 49 Self-test failure codes for NTAK10 2.0 Mb DTI (Part 6 of 6) 157 = CI-1, NI FIFO overflowed, and has been cleared. 128 message were lost. 255 = TS16-DS30X FIFO overflowed, and has been cleared.
Page 177 2.0 Mb DTI maintenance Page 177 of 210 Figure 30 Near-end trunk loopback Far-end switch Near-end switch NEAR END FAR END System Option 11 Far-end switch Far End Switch NTAK10 RMST l (per-loop - loop disabled) or RMST L (per loop— loop Placed in remote loopback Placed in remote loopback RMST L CH (per channel - channel...
Page 178 Page 178 of 210 2.0 Mb DTI maintenance The commands for a far-end per-loop loopback test are shown in Table 53. Table 53 LD 60 – Perform a far-end per-channel loopback test. Command Description Disable the 2.0 Mb DTI card. DSCH L CH Place the 2.0 Mb DTI card in RLBK L CH...
Page 179: 2.0 Mb Pri Maintenance
Page 179 of 210 2.0 Mb PRI maintenance Contents This section contains information on the following topics: Overview ..........Enable the 2.0 Mb PRI after installation .
Page 180 Page 180 of 210 2.0 Mb PRI maintenance Procedure 22 Enabling the NTAK79 PRI Enter the following command in LD 60 to software enable all 2.0 Mb PRI cards: ENLL N The DCHI enables automatically. Enter the following command in LD 60 to software enable the clock controller: ENL CC 0 Enter the following command to enable clock tracking on primary digital...
Page 181: Disable The 2.0 Mb Pri Before Removal
2.0 Mb PRI maintenance Page 181 of 210 TRCK PCK Within about 30, seconds the D-channel layer 3 should be established. You can request the current status of the D-channel by issuing the command STAT DCH. The system should respond DCH N EST in LD 96 (meaning that the D-channel is established and operational).
Page 182: Monitor System Pri Operation
Page 182 of 210 2.0 Mb PRI maintenance DIS MSDL N Enter the following command in LD 60 to software disable the clock controller: DIS CC 0 Enter the following command in LD 60 to software disable the PRI card: DISL N Where N is the PRI card number.
Page 183 2.0 Mb PRI maintenance Page 183 of 210 status, and channel capability for each status. When the status of the near-end and far end does not match, the more severe maintenance status takes effect. Table 54 Maintenance message status Near-end status Far-end status B channel capability In-service...
Page 184 Page 184 of 210 2.0 Mb PRI maintenance B-channel status change Whenever there is a status change for a B-channel or an ISL channel, the new status is reported to the far end in a service message. Status change can occur through service change or maintenance operations, such as the addition or deletion of a channel in LD 14, or the disabling of the associated loop, shelf, card or unit in LD 30, LD 32, LD 36, LD 41 or LD 60.
Page 185 2.0 Mb PRI maintenance Page 185 of 210 • Frame Bit Errors (FBER) • CRC-4 Word Errors (CRC) • Controlled Frame Slips Bipolar Violations (BPV) In an Alternate Mark Inversion (AMI) bipolar pulse stream, pulses alternate in polarity. A bipolar violation has occurred when two pulses of the same polarity are received in succession, as shown in Figure 32.
Page 186 Page 186 of 210 2.0 Mb PRI maintenance Frame bit errors The NTAK79/NTBK50 PRI CEPT PCM-30 stream is structured into a frame of 32 8-bit timeslots. To maintain alignment of this frame structure, alternate timeslot zeros have a specific frame alignment pattern (X0011011). A frame bit error is acknowledged when any bit in the received pattern is in error.
Page 187 2.0 Mb PRI maintenance Page 187 of 210 • Unavailable condition: This is reported when 10 severely errored seconds are received in 10 consecutive seconds. This is equivalent to an error rate worse than 10 with the default value. When this condition is reached, the 2.0 Mb PRI is put into an out-of-service condition until the Group I OOS guard timer expires and the error condition has ceased or improved.
Page 188 Page 188 of 210 2.0 Mb PRI maintenance LD 73 – Program group I thresholds (Part 2 of 2) Prompt Response Description N1 N2 Bipolar Violation thresholds Default: 128 122 N1 N2 Cyclic Redundancy Check thresholds Default: 201 97 FBER N1 N2 Frame Bit Errors Default: 28 1...
Page 189 2.0 Mb PRI maintenance Page 189 of 210 A 2.0 Mb PRI contains a buffer large enough to contain two full frames (256 x 2 = 512 bits), and is normally kept half full (1 frame). See Table 55 on page 189 for the impact of one slip on various types of data.
Page 190 Page 190 of 210 2.0 Mb PRI maintenance Frame slips have two alarm thresholds as defined in LD 73. They are as follows: • Slip — out-of-service threshold. When this threshold (variable count versus variable time) is reached, the PRI card is placed in an out-of- service state.
Page 191 2.0 Mb PRI maintenance Page 191 of 210 Yellow (far-end) alarms A Yellow alarm on the 2.0 Mb PRI card indicates that the card is receiving an alarm indication from the far end. This type of alarm may be received in two ways: Remote Alarm Indication (RAI) —...
Page 192 Page 192 of 210 2.0 Mb PRI maintenance For Group 2 Red alarm conditions, there are four definable time thresholds that can be set in LD 73 on a per-loop basis. The first parameter sets an aggregate time in multiples of 128 msec (default 20 = 2.5 sec). The next four parameters provide time thresholds for MAINT, NNDC, NNC, and OOS.
Page 193 2.0 Mb PRI maintenance Page 193 of 210 LD 73 — Define group 2 error thresholds (Part 2 of 2) Prompt Response Description NNC2 1-(15)-255s No New Calls threshold MNT2 1-(15)-255s Maintenance Threshold PERS Alarm persistence timer (in multiples of 2ms) CLRS Clearance persistence timer (in multiples of 2ms) OOSC...
Page 194 Page 194 of 210 2.0 Mb PRI maintenance Table 56 NTAK79 faceplate LEDs (Part 2 of 3) State Definition On (Green) The NTAK79 2.0 Mb PRI circuit card is in an active state. The NTAK79 2.0 Mb PRI is in a disabled state.
Page 195 2.0 Mb PRI maintenance Page 195 of 210 Table 56 NTAK79 faceplate LEDs (Part 3 of 3) State Definition The clock controller is switched off (by switch SW3). On (Red) DCHI is switched on and disabled. On (Green) DCHI is switched on and enabled, but not necessarily established.
Page 196 Page 196 of 210 2.0 Mb PRI maintenance Table 57 NTBK50 faceplate LEDs (Part 2 of 3) State Definition On (Red) A Red alarm state has been detected. This represents a local alarm state of Loss of Carrier (LOS), Loss of Frame (LFAS), or Loss of CRC Multiframe (LMAS).
Page 197 2.0 Mb PRI maintenance Page 197 of 210 Table 57 NTBK50 faceplate LEDs (Part 3 of 3) State Definition The clock controller is not equipped. On (Red) DCH is disabled. On (Green) DCH is enabled, but not necessarily established. DCH is not equipped. System PRI maintenance tools Table 58 2.0 Mb PRI commands (LD 60)
Page 198 Page 198 of 210 2.0 Mb PRI maintenance DCHI commands D-channel commands are found in LD 96. Table 59 provides a quick- reference list of D-channel commands. Table 59 DCHI commands Command Action DIS DCHI N Disable DCHI port N. ENL DCHI N Enable DCHI port N.
Page 199 2.0 Mb PRI maintenance Page 199 of 210 DDCH commands Downloadable D-channel commands are found in LD 96. Table 60 provides a quick-reference list of D-channel commands with minor modification. Table 60 DDCH commands Command Action DIS MSDL X (ALL) Disable DCHI card X.
Page 200 Page 200 of 210 2.0 Mb PRI maintenance D-channel status and error conditions are reported as DCH messages. These messages can be found in the Software Input/Output: Maintenance (553- 3001-511). Clock controller commands Clock controller (CC) commands are accessed in LD 60. Table 61 provides a quick-reference list of clock controller commands.
Page 201 2.0 Mb PRI maintenance Page 201 of 210 Self-test error codes Table 62 lists the self-test failure codes for the NTAK79/NTBK50 2.0 Mb PRI. These codes can be returned on card power-up in the form “DTA105 L X” (where X is the failure code), or during a self-test procedure in LD 60 as “DTI009 L X”...
Page 202 Page 202 of 210 2.0 Mb PRI maintenance Table 62 Self-test error codes (Part 2 of 2) Failure code Associated error Loop remote loopback failure. Channel remote loopback failure. Procedure 26 Self-testing the 2.0 Mb PRI This self-test can be run manually on a per-loop or per-channel basis using LD 60.
Page 203 2.0 Mb PRI maintenance Page 203 of 210 2.0 Mb PRI automatic loop test With ATLP command set to one and if all 30 channels are idle at midnight, the system software disables the card and performs a self-test on all channels. This causes a Yellow alarm to be generated to the far end.
Page 204 Page 204 of 210 2.0 Mb PRI maintenance Figure 33 2.0 Mb PRI link diagnostic (far-end loopback) test Near-end Far-end Far-end Switch Small System NTAK79 NTAK50 RMST L - test run from PRI2 end RLBK L - this end in loopback 553-A0146 Procedure 27 Running the link diagnostic test...
Page 205 2.0 Mb PRI maintenance Page 205 of 210 The 2.0 Mb PRI channel or loop (card) tested must be disabled. Figure 34 2.0 Mb PRI remote loopback test Near-end Far-end Far-end Switch Small System NTAK79 NTAK50 RLBK L - this end in loopback RLBK L - test run from this end 553-A0147 Coordinating the remote loopback tests...
Page 206 Page 206 of 210 2.0 Mb PRI maintenance 553-3001-517 Standard 2.00 September 2004...
Page 207 Page 207 of 210 2.0 Mb ISL maintenance Contents This section contains information on the following topics: Overview ..........ISL maintenance .
Page 208 Page 208 of 210 2.0 Mb ISL maintenance Table 63 D-channel commands (LD 96) (Part 2 of 2) Command Action PLOG DCHI N Print D-channel statistics log N. RLS DCH N Release D-channel N. SDCH DCH N Release a D-channel and switch D-channels. RST DCH N Reset D-channel N.
Page 209 2.0 Mb ISL maintenance Page 209 of 210 Note: Protocol converters AO378652 and AO381016 supplied with the system are not gender changers. Figure 35 ISL back-to-back connection Port 1, DCHI Y 25 pin female-to-female Gender changer NTAK02 NTAK19BA custom cable Port 3, DCHI X Port settings: •...
Page 210 Page 210 of 210 2.0 Mb ISL maintenance 553-3001-517 Standard 2.00 September 2004...
Page 212 Copyright © 2003–2004 Nortel Networks All Rights Reserved Information is subject to change without notice. Nortel Networks reserves the right to make changes in design or components as progress in engineering and manufacturing may warrant. SL-1, Meridian 1, and Succession are trademarks of Nortel Networks.

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Nortel Communication Server 1000S Maintenance Manual

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PRI Fault Clearing

Quick Reference to Pri Operations

Primary Rate Interface Maintenance

D-Channel Maintenance

Clock Controller Maintenance

ISDN Signaling Link Maintenance

1.5 Mb DTI/PRI Maintenance

1.5 Mb ISL Maintenance

2.0 Mb DTI Maintenance

2.0 Mb PRI Maintenance

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