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PairGain HIGAIN HLU-232 Manual

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PAIRGAIN TECHNOLOGIES
Technical Practice
Engineering - PLANT Series
H
List #
1D
CONTENTS
A. GENERAL ......................................................... 2
1. DESCRIPTION AND FEATURES ................ 2
2. APPLICATIONS .......................................... 3
3. FUNCTIONAL OPERATION........................ 5
4. ALARMS ..................................................... 8
SETTINGS................................................. 11
SETTINGS................................................. 16
7. INSTALLATION......................................... 19
8. SPECIFICATIONS..................................... 20
9. CERTIFICATION ....................................... 21
10. WARRANTY .............................................. 21
11. TECHNICAL ASSISTANCE....................... 21
DOUBLERS ..................................................... 22
1. GENERAL ................................................. 22
2. POWER CONSUMPTION.......................... 22
3. LOOPBACK OPERATION ........................ 23
4. TESTING ................................................... 25
SCREENS ................................................. 39
DOUBLERS ..................................................... 49
1. GENERAL ................................................. 49
2. POWER CONSUMPTION.......................... 49
3. LOOPBACK OPERATION ........................ 51
4. TESTING ................................................... 53
SCREENS ................................................. 67
Revision history:
Revision 01-September 5, 1996
a) Initial release.
™
G
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INE
PairGain #
150-1246-14
PAGE
MODEL HLU-232
NIT
CLEI Code
T1L1GK03AA
Figure 1. HLU-232, List 1D Front Panel. The
PairGain HLU-232 is the local unit used in
conjunction with the HRU-412 remote unit to
provide a complete HiGain HDSL system with
protection switching capability.
CAUTION: T
SENSITIVE COMPONENTS
DISCHARGE PROCEDURES MUST BE FOLLOWED
Section 150-232-100
September 5, 1996
HLU2 3 2
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LINE UNIT
MARG IN
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SETUP
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STATUS
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SPAN
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SPAN
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HIS PRODUCT INCORPORATES STATIC
. P
ROPER ELECTROSTATIC
Revision 01
.
Page 1

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Summary of Contents for PairGain HIGAIN HLU-232

  • Page 1: Table Of Contents

    3. LOOPBACK OPERATION ......23 4. TESTING ........... 25 Figure 1. HLU-232, List 1D Front Panel. The 5. SYSTEM MAINTENANCE MENU PairGain HLU-232 is the local unit used in SCREENS ..........39 conjunction with the HRU-412 remote unit to C. APPLICATIONS USING HIGAIN provide a complete HiGain HDSL system with DOUBLERS .............

  • Page 2: General

    1. DESCRIPTION AND FEATURES 1.01 PairGain’s HiGain protection switch line unit Model HLU-232, List 1D is the Central Office (CO) side of a repeaterless T1 transmission system (see Figure 1). The line unit is designed for high reliability applications and is capable of providing a “hot standby”...

  • Page 3: Applications

    Section 150-232-100 Revision 01 2. APPLICATIONS 2.01 The primary application of the HLU-232 is to provide a “hot standby” backup unit when used in conjunction with another HLU-232. Both units require the use of an HSA-232 Shelf Adapter for all applications. The HSA-232 Shelf Adapter slides into a standard 220-type mechanics shelf, which provides access to the shelf card-edge connector.
  • Page 4 Section 150-232-100 Revision 01 HIGAIN 1 x 1 PROTECTION SWITCH HSA-232 HRE-422 HLU-232 HRU-412 PROTECT CONTROL CONTROL PROTECT PROTECT PRIMARY PRIMARY HRU-412 HLU-232 PRIMARY protsw Figure 2. HiGain Protection Circuit. Page 4...

  • Page 5: Functional Operation

    1.568 Mbps between the two units. 3.05 A block diagram of the HLU-232 is shown in Figure 3. The HiGain HLU-232 receives a 1.544 Mbps DS1 data stream from the DSX-1 digital cross connect interface. The HLU contains a DS1 frame synchronizer controlled by an 8-bit micro controller that determines the type of framing on the DS1 stream and synchronizes to it.
  • Page 6 R IN G 2 A L R M Figure 3. HLU-232, List 1D Block Diagram. PairGain’s HDSL technology provides full-duplex services at standard T1 rates over copper wires between an HLU and an HRU, which comprise one HiGain system. Note : The HLU-232 List 1D requires the use of an HSA-232 Shelf Adapter for both normal and protection applications.
  • Page 7 Section 150-232-100 Revision 01 3.10 The reconstructed HDSL data channel is buffered in a first-in-first-out buffer (FIFO) within the multiplexer. A frequency synthesizer in conjunction with the FIFO regulates the output bit rate and reconstructs the DS1 clock at the exact rate received from the remote end. The HiGain system operates at DS1 rates of 1.544 Mbps with up to ±200 bps of offset.

  • Page 8: Alarms

    Section 150-232-100 Revision 01 4. ALARMS 4.01 The normally open alarm contacts available across pins 12 and 14 (Figure 3) comprise the HLU-232’s Minor Alarm output and are available at the 220 shelf back plane across pins 20 and 21 respectively (Figure 5). These alarm contacts close for any of the following alarm conditions, and the alarm type is shown on the HLU-232 List 1D front panel display.
  • Page 9 Section 150-232-100 Revision 01 Figure 4. HLU-232, List 1D DB-9 Pin-Outs. A standard RS-232 DB-9, female connector on the front panel provides access to the menu interface feature via a dumb terminal. 4.02 The HLU 232’s STATUS LED flashes RED for the duration of a minor alarm condition. The H1(2)ES and DS1 alarms can be inhibited by selecting NONE for the ESAL system option.
  • Page 10 Section 150-232-100 Revision 01 4.03 Note that when both HDSL loops detect a Loss of Sync Word (LOSW), a minor alarm condition exists but because the HLU enters a self test mode, the front panel LED lights yellow instead of red and the “SELF...TEST” message is displayed instead of the “ALRM”...

  • Page 11: Normal System Options Settings

    Section 150-232-100 Revision 01 5. NORMAL SYSTEM OPTIONS SETTINGS 5.01 When the two HLU-232 plugs are to be used as normal, stand-alone line units, the configuration switch on the HSA-232 Shelf Adapter must be set to NORMAL. For more details, refer to the HSA-232 Technical Practice #100-232-100.
  • Page 12 Section 150-232-100 Revision 01 5.07 The following three user options can only be set using an ASCII terminal: CIRCUIT ID, DS0 BLOCKING and MARGIN ALARM THRESHOLD. 5.08 The CIRCUIT ID option is set by selecting the “H” option from the terminal’s main menu shown in Figure 7. The message “enter circuit ID # (24 characters max):”...
  • Page 13 HLU during these out of sync intervals, to exhibit occasional BPVs on the HLU DS1 output. 5.16 The PairGain HCS-417 and -418 shelves and some 220-configuration shelves deployed in remote cabinets do not have external equalizers. Therefore, the “EXT” setting of the EQL option is never used in these applications.
  • Page 14 Section 150-232-100 Revision 01 TABLE 2. SYSTEM OPTION SETTINGS Mode Selection Description EXT* Replaces the internal equalizer with a 12 Vp/p driver for external equalizers. Sets Equalizer to DSX-1 for 0-133 feet. Sets Equalizer to DSX-1 for 133-266 feet. Sets Equalizer to DSX-1 for 266-399 feet. Sets Equalizer to DSX-1 for 399-533 feet.
  • Page 15 Section 150-232-100 Revision 01 TABLE 2. SYSTEM OPTION SETTINGS (CONTINUED) Mode Selection Description FRMG AUTO* Configures HiGain to operate in an auto-framing (AUTO) mode in which it continuously searches the input DS1 bit stream for a valid SF or ESF frame pattern. This feature is required for fractional DS1 applications (DS0 blocking) where it insures proper channel time slot alignment.

  • Page 16: Protection System Option Settings

    Section 150-232-100 Revision 01 6. PROTECTION SYSTEM OPTION SETTINGS 6.01 When the two HLU-232 plugs are to be used for the Protection function, the configuration switch on the HSA- 232 Shelf Adapter must be set to PROTECT. For more details, refer to the HSA-232 Technical Practice #100-232- 100.
  • Page 17 Section 150-232-100 Revision 01 The Lock-In thresholds provide a mechanism to prevent repetitive switchover/reverts in the event of recurring intermittent fault conditions. These thresholds are set by the G, H & I options in the Protection Switch Configuration menu shown in Figure 16. After G switchovers in H minutes, the switchover to the protect circuit remains (does not revert) for I hours.
  • Page 18 Section 150-232-100 Revision 01 TABLE 3. PROTECTION SYSTEM OPTION SETTINGS Mode Selection Description Protection Mode MDIS Invokes the Manual Disable mode. This keeps the Primary circuit on- line and inhibits switch-over to the Protection circuit. MPRO Invokes the Manual Protect mode to switch to the Protection circuit and locks the Protection circuit on-line.

  • Page 19: Installation

    PairGain Technologies. 7.02 The HLU-232 mounts into a PairGain HSA-232 Shelf Adapter. This combined assembly is then installed into a 220-configuration Office Repeater Bay (ORB) shelf or equivalent Small Cross Section Shelf (SXSS), Kentrox T- Term, Wescom 342-30 shelves, or PairGain HCS-418 (19”) or HCS-417 (23”) shelves.

  • Page 20: Specifications

    Section 150-232-100 Revision 01 8. SPECIFICATIONS ELECTRICAL SPECIFICATIONS HDSL Line Code 784 kbps 2B1Q full duplex HDSL Output +13.5 dBm ± 0.5 dBm at 135 ohms HDSL Line Impedance 135 ohms Maximum Provisioning Loss 35 dBm at 196 kHz, 135 ohms Line Clock rate Internal Stratum 4 clock HDSL Startup Time...

  • Page 21: Certification

    10. WARRANTY 10.01 PairGain Technologies warrants this product to be free of defects and to be fully functional for a period of 60 months from the date of original shipment, given proper installation. PairGain will repair or replace any unit without cost during this period if the unit is found to be defective for any reason other than abuse, improper use, or improper installation.

  • Page 22: Applications Without Using Higain Doublers

    Section 150-232-100 Revision 01 B. APPLICATIONS WITHOUT USING HIGAIN DOUBLERS 1. GENERAL 1.01 This section addresses HLU-232 List 1D operation when used without doublers. For applications without Doublers, the HLU-232 List 1D is directly connected to the HRU-412 by the two HDSL cable pairs. 2.

  • Page 23: Loopback Operation

    Section 150-232-100 Revision 01 3. LOOPBACK OPERATION 3.01 The HiGain system has a family of loopback options. The most important of these is the “Smart-Jack” loopback which enables the HRU-412 to respond to the standard (2/3 in 5) Smart-Jack in-band loopback codes and thus emulate the functions of a standard Network Interface Device (NID).
  • Page 24 Section 150-232-100 Revision 01 3.07 When T1 loopback tests are performed on the HiGain system with metallic loopback connections at either end, the DS1 code that exists at the metallic loopback interface may be different from the DS1 code being received at the opposite end when the DS1 user code is set to AUTO.

  • Page 25: Testing

    Section 150-232-100 Revision 01 4. TESTING 4.01 Table 4 through Table 9 provide step-by-step test procedures for the HLU-232 List 1D as a function of the loopback option selected. These procedures allow verification of the integrity of the HDSL channels at every module location as well as the DS1 channels to the customer and the local DSX-1 interface.
  • Page 26 Section 150-232-100 Revision 01 Figure 6. HLU-232 non-Doubler Loopback Configurations. The most important of the HiGain family of loopback options is the Smart-Jack loopback, which emulates the functions of a standard NID. Page 26...
  • Page 27 Section 150-232-100 Revision 01 TABLE 4. HLU-232 GNLB TEST PROCEDURES Step Action Have the CO tester send the HRU-412 (3 in 7) in-band loop-up code for five seconds. Observe that the HLU-232 List 1D displays the “NREM” message indicating an HRU loopback is in effect. Have the CO tester transmit a T1 test signal into the HLU-232 List 1D and verify that the returned (looped) signal is error free.
  • Page 28 Section 150-232-100 Revision 01 TABLE 5. HLU-232 A1LB TEST PROCEDURES Step Action Send into the HLU-232 List 1D the in-band ARMING and NI LPBK code 11000 for at least five seconds, or at least four repetitions of the 16-bit ESF Data Link ARMING code 1111 1111 0100 1000 (FF48). (Left bit arrives first) Monitor the output of the HLU-232 List 1D for return of the pattern.
  • Page 29 Section 150-232-100 Revision 01 TABLE 5. HLU-232 A1LB TEST PROCEDURES (CONTINUED) Step Action Using the following codes, a network tester can activate loopbacks NLOC or NREM or SMJK (if enabled) shown in Figure 6. A customer tester can activate loopbacks CLOC or CREM. ADDRESSABLE 1 (A1LB) REPEATER LOOPBACK COMMANDS ARMING or NI LPBK (in-band) Arming code...
  • Page 30 Section 150-232-100 Revision 01 TABLE 6. HLU-232 A2LB TEST PROCEDURES Step Action Send into the HLU-232 List 1D the in-band ARMING and NI LPBK code 11000 for at least five seconds, or at least four repetitions of the 16-bit ESF Data Link ARMING code 1111 1111 0100 1000 (FF48). (Left bit arrive first).
  • Page 31 Section 150-232-100 Revision 01 TABLE 6. HLU-232 A2LB TEST PROCEDURES (CONTINUED) Step Action Using the following codes, a network tester can activate loopbacks NLOC or NREM or SMJK (if enabled) shown in Figure 6. A customer tester can activate loopbacks CLOC or CREM. ADDRESSABLE 2 (A2LB) REPEATER LOOPBACK COMMANDS ARMING or NI LPBK (in-band) Arming code...
  • Page 32 Section 150-232-100 Revision 01 TABLE 7. HLU-232 A3LB TEST PROCEDURES Step Action The HiGain Line Unit can be looped back (NLOC in Figure 6) by sending the Addressable Office Repeater (AOR) LPBK activation code 1111 1111 0001 1110 (FF1E) for at least five seconds. This causes the HLU- 232 List 1D to enter its NLOC state shown in Figure 6.
  • Page 33 Section 150-232-100 Revision 01 TABLE 8. HLU-232 A4LB TEST PROCEDURES Step Action The HiGain Line Unit can be looped back (NLOC in Figure 6) by sending the Addressable Office Repeater (AOR) LPBK activation code 1111 1111 0001 1110 (FF1E) for at least five seconds. This causes the HLU- 232 List 1D to enter its NLOC state shown in Figure 6.
  • Page 34 Section 150-232-100 Revision 01 TABLE 9. HLU-232 A5LB TEST PROCEDURES Step Action Send into the HLU-232 List 1D the in-band ARMING and NI (Network Interface) LPBK code 11000 for at least five seconds, or at least four repetitions of the 16-bit ESF Data Link ARMING code 1111 1111 0100 1000 (FF48).
  • Page 35 Section 150-232-100 Revision 01 TABLE 9. HLU-232 A5LB TEST PROCEDURES (CONTINUED) Step Action Using the following codes, a network tester can activate loopbacks NLOC or NREM or SMJK (if enabled) shown in Figure 6. A customer tester can activate loopbacks CLOC or CREM. ADDRESSABLE 5 (A5LB) REPEATER LOOPBACK S ARMING or NI LPBK (in-band) Arming code...
  • Page 36 Section 150-232-100 Revision 01 TABLE 10. HLU-232, LIST 1D 4-CHARACTER FRONT PANEL MESSAGES Message Full Name Description CREM Customer Remote Signal from customer is looped back to customer at HLU-232. Loopback NLOC Network Local DSX signal is looped back to DSX at HLU. Loopback CLOC Customer Local...
  • Page 37 Section 150-232-100 Revision 01 TABLE 10. HLU-232, LIST 1D 4-CHARACTER FRONT PANEL MESSAGES (CONTINUED) Message Full Name Description Power Feed Open Indicates an open circuit in the T&R of either HDSL pair. FEED OPEN POFF Power Feed Off HDSL span power has been turned off by setting the PWRF option to DIS. Power Feed Off HDSL span power has been turned off from the use of the A1LB/A2LB/A5LB Intellegent Office Repeater (IOR) power down code (see Tables 5, 6, and 9).
  • Page 38 Section 150-232-100 Revision 01 TABLE 11. ADDITIONAL HLU 4-CHARACTER FRONT PANEL MESSAGES FOR PROTECTION OPERATION Message Full Name Description PROT Switched Displayed on Protection HLU only. This minor alarm indicates that the protection line unit State has switched states and the DS1 data is transported over the protection circuit. PROR Protection Displayed on Protection HLU only.

  • Page 39: System Maintenance Menu Screens

    Section 150-232-100 Revision 01 5. SYSTEM MAINTENANCE MENU SCREENS 5.01 Figure 7 is the Maintenance Terminal MAIN MENU Screen. Its ten sub-menus provide many useful provisioning, test and monitoring tools. Figure 8 shows the HLU-232 List 1D SPAN STATUS Screen. 5.02 Figure 9 shows the SET CLOCK menu.
  • Page 40 Section 150-232-100 Revision 01 TABLE 12. HLU-232 LIST 1D STATUS MENU MESSAGES Message Full Name Description ALARMS : NONE No Alarms LLOS Local Loss of Signal No signal from HLU-232 List 1D local T1 interface. RLOS Remote Loss of Signal No signal from HRU-412 remote T1 interface. LOSW1 Loss of Sync Word 1 HDSL loop 1 or 2 has lost sync.
  • Page 41 Section 150-232-100 Revision 01 TABLE 12. HLU-232 LIST 1D STATUS MENU MESSAGES (CONTINUED) Message Full Name Description HBER Excessive HDSL Bit This minor alarm is generated on either the Primary or Protection line unit Error Rate whenever the line unit determines that its current BER has exceeded the minimum BER threshold set by the user.
  • Page 42 Section 150-232-100 Revision 01 TABLE 13. GLOSSARY OF HIGAIN TERMS Term Definition MARGIN Indicates the excess signal to noise ratio, at either the HRU-412 or HLU-232 List 1D HDSL ports, relative to a 10 Bit Error Rate. 1st value is current margin, 2nd value is minimum margin since (C)leared last, 3rd value is maximum value since cleared.
  • Page 43 Section 150-232-100 Revision 01 Figure 7. HLU-232 List 1D Main Menu for the Primary Line Unit. Figure 8. HLU-232 List 1D non-Doubler Span Status. Page 43...
  • Page 44 Section 150-232-100 Revision 01 Figure 9. Set Clock Menu. Figure 10. HLU-232 List 1D System Settings Main Menu. Page 44...
  • Page 45 Section 150-232-100 Revision 01 Figure 11. HLU-232 List 1D non-Doubler Loopback Menu. Figure 12. HLU-232 List 1D non-Doubler Performance Data. Page 45...
  • Page 46 Section 150-232-100 Revision 01 Figure 13. HLU-232 List 1D non-Doubler Performance Data History. Figure 14. HLU-232 List 1D non-Doubler Alarm History. Page 46...
  • Page 47 Section 150-232-100 Revision 01 Figure 15. HLU-232 List 1D Main Menu for the Protection Line Unit. Figure 16. Protection Switch Configuration Menu for the Protection Line Unit. Page 47...
  • Page 48 Section 150-232-100 Revision 01 Figure 17. Protection Mode Menu for the Protection Line Unit Figure 18. View Switchover History for the Protection Line Unit. Page 48...

  • Page 49: Applications Using Higain Doublers

    Section 150-232-100 Revision 01 C. APPLICATIONS USING HIGAIN DOUBLERS 1. GENERAL 1.01 One or two HDU-451, HDU-439, or HDU-437 Doublers may be used to extend the distance between the HLU- 232 Line Unit and the HRU-412 Remote Unit. Note that older List 1, 2, and 3 versions of the HDU-451 do not support protection switching.
  • Page 50 Powering -48 V New Bays (J98725P, J98725P, J98725P) SXSS (CO) (J98725CA) Original 220 Bays 3.43 (J98725A, B, C, D, E, F) Upgraded 220 Bays (J98725A, B, C, D, E, F) SXSS (80D Cabinet) Kentrox T-Term 220 PairGain HCS-417 Page 50...

  • Page 51: Loopback Operation

    Section 150-232-100 Revision 01 3. LOOPBACK OPERATION 3.01 The HiGain system has a family of loopback options. The most important of these is the Smart-Jack loopback which enables the HRU-412 to respond to the standard (2/3 in 5) Smart-Jack in-band loopback codes. This option can be enabled or disabled from either the front panel settings or the terminal SYSTEM SETTINGS Menu Screen.
  • Page 52 The HLU-232 List 1D and the HRU-412. The most complex HiGain system application includes the HLU-232 List 1D, HRU-412 & two in-line Doublers. Refer to the PairGain HiGain Intelligent Repeater Application Note # 910, Part # 325-910-100, for more SPLB details.

  • Page 53: Testing

    Section 150-232-100 Revision 01 4. TESTING 4.01 Table 16 through Table 21 provide step-by-step test procedures for the HLU-232 List 1D as a function of the loopback option selected. These procedures allow verification of the integrity of the HDSL channels at every module location as well as the DS1 channels to the customer and the local DSX-1 interface.
  • Page 54 Section 150-232-100 Revision 01 HRU-4 1 2 HDSL SPAN LO G IC TLO S HRU-4 1 2 HDSL SPAN 2 in 5 SMJK* AIS** HRU-4 1 2 LOO PB AC K S HLU-2 3 2 HDSL SPAN 3 in 7 TO WAR D S NREM N ETW O RK...
  • Page 55 Section 150-232-100 Revision 01 TABLE 16. HLU-232 GNLB TEST PROCEDURES Step Action Have the CO tester send the HRU-412 (3 in 7) in-band loop-up code for five seconds. Observe that the HLU-232 List 1D displays the “NREM” message indicating an HRU-412 loopback is in effect (Figure 19). Have the CO tester transmit a T1 test signal into the HLU-232 List 1D and verify that the returned (looped) signal is error free.
  • Page 56 Section 150-232-100 Revision 01 TABLE 17. HLU-232 A1LB TEST PROCEDURES Step Action Send into the HLU-232 List 1D the in-band ARMING and NI LPBK code 11000 for at least five seconds, or at least four repetitions of the 16-bit ESF Data Link ARMING code 1111 1111 0100 1000 (FF48). (Left bit arrives first).
  • Page 57 Section 150-232-100 Revision 01 TABLE 17. HLU-232 A1LB TEST PROCEDURES (CONTINUED) Step Action Using the following codes, a network tester can activate loopbacks NLOC or NREM or SMJK (if enabled) shown in Figure 19. A customer tester can activate loopbacks CLOC or CREM. ADDRESSABLE 1 (A1LB) REPEATER LOOPBACK COMMANDS ARMING or NI LPBK (in-band) Arming code...
  • Page 58 Section 150-232-100 Revision 01 TABLE 18. HLU-232 A2LB TEST PROCEDURES Step Action Send into the HLU-232 List 1D the in-band ARMING and NI LPBK code 11000 for at least five seconds, or at least four repetitions of the 16-bit ESF Data Link ARMING code 1111 1111 0100 1000 (FF48). (Left bit arrives first).
  • Page 59 Section 150-232-100 Revision 01 TABLE 18. HLU-232 A2LB TEST PROCEDURES (CONTINUED) Step Action Using the following codes, a network tester can activate loopbacks NLOC or NREM or SMJK (if enabled) shown in Figure 19. A customer tester can activate loopbacks CLOC or CREM. ADDRESSABLE 2 (A2LB) REPEATER LOOPBACK COMMANDS ARMING or NI LPBK (in-band) Arming code...
  • Page 60 Section 150-232-100 Revision 01 TABLE 19. HLU-232 A3LB TEST PROCEDURES Step Action The HLU-232 List 1D can be looped back by sending the Addressable Office Repeater (AOR) LPBK activation code 1111 1111 0001 1110 (FF1E) for at least five seconds. This causes the HLU-232 List 1D to enter its NLOC state shown in Figure 19.
  • Page 61 Section 150-232-100 Revision 01 TABLE 20. HLU-232 A4LB TEST PROCEDURES Step Action The HLU-232 List 1D can be looped back by sending the Addressable Office Repeater (AOR) LPBK activation code 1111 1111 0001 1110 (FF1E) for at least five seconds. This causes the HLU-232 List 1D to enter its NLOC state shown in Figure 19.
  • Page 62 Section 150-232-100 Revision 01 TABLE 21. HLU-232 A5LB TEST PROCEDURES Step Action Send into the HLU-232 List 1D the in-band ARMING and NI LPBK code 11000 for at least five seconds, or at least four repetitions of the 16-bit ESF Data Link ARMING code 1111 1111 0100 1000 (FF48). (Left bit arrives first).
  • Page 63 Section 150-232-100 Revision 01 TABLE 21. HLU-232 A5LB TEST PROCEDURES (CONTINUED) Step Action Using the following codes, a network tester can activate loopbacks NLOC or NREM or SMJK (if enabled) shown in Figure 19. A customer tester can activate loopbacks CLOC or CREM. ADDRESSABLE 5 (A5LB) REPEATER LOOPBACK COMMANDS ARMING or NI LPBK (in-band) Arming code...
  • Page 64 Section 150-232-100 Revision 01 TABLE 22. HLU-232, LIST 1D 4-CHARACTER FRONT PANEL MESSAGES Message Full Name Description CREM Customer Remote Signal from customer is looped back to customer at HLU-232. Loopback NLOC Network Local DSX signal is looped back to DSX at HLU. Loopback CLOC Customer Local...
  • Page 65 Section 150-232-100 Revision 01 TABLE 22. HLU-232, LIST 1D 4-CHARACTER FRONT PANEL MESSAGES (CONTINUED) Message Full Name Description POFF Power Feed Off HDSL span power has been turned off by setting the PWRF option to DIS. Power Feed Off HDSL span power has been turned off from the use of the A1LB/A2LB/A5LB Intellegent Office Repeater (IOR) power down code (see Tables 17, 18, and 21).
  • Page 66 Section 150-232-100 Revision 01 TABLE 23. ADDITIONAL HLU 4-CHARACTER FRONT PANEL MESSAGES FOR PROTECTION OPERATION Message Full Name Description PROT Switched State Displayed on Protection HLU only. This minor alarm indicates that the protection line unit has switched states and the DS1 data is transported over the protection circuit.

  • Page 67: System Maintenance Menu Screens

    Section 150-232-100 Revision 01 5. SYSTEM MAINTENANCE MENU SCREENS 5.01 Figure 20 is the Maintenance Terminal MAIN MENU Screen. Its ten sub-menus provide many useful provisioning, test and monitoring tools. 5.02 Figure 21 through Figure 24 show the HLU-232 List 1D SPAN STATUS screens for single and dual Doubler applications.
  • Page 68 Section 150-232-100 Revision 01 5.08 Figure 36 through Figure 38 show the ALARM HISTORY screens for Doubler applications. The alarms are defined in Section A Paragraph 4.01. The LOS and PWR system alarms are common to all spans. Only the LOSW, ES &...
  • Page 69 Section 150-232-174 Revision 01 TABLE 24. HLU-232 LIST 1D STATUS MENU MESSAGES Message Full Name Description ALARMS : LLOS Local Loss of No signal from HLU-232 List 1D local T1 interface. Signal RLOS Remote Loss of No signal from HRU-412 remote T1 interface. Signal LOSW1 Loss of Sync Word...
  • Page 70 Section 150-232-174 Revision 01 TABLE 24. HLU-232 LIST 1D STATUS MENU MESSAGES (CONTINUED) Message Full Name Description HBER Excessive HDSL This minor alarm is generated on either the Primary or Protection line unit Bit Error Rate whenever the line unit determines that its current BER has exceeded the minimum BER threshold set by the user.
  • Page 71 Section 150-232-174 Revision 01 TABLE 25. GLOSSARY OF HIGAIN TERMS Term Definition MARGIN Indicates the excess signal to noise ratio, at the HRU-412, HDU-451, or HLU-232 List 1D HDSL ports, relative to a 10 BER. 1st value is current margin, 2nd value is minimum margin since (C)leared last, 3rd value is maximum value since cleared.
  • Page 72 Section 150-232-174 Revision 01 Figure 20. HLU-232 List 1D Main Menu for the Primary Line Unit. Figure 21. HLU-232 List 1D Status Display - Span 1 (1 or 2 Doublers). Page 72...
  • Page 73 Section 150-232-174 Revision 01 Figure 22. HLU-232 List 1D Status Display - Span 2 (1 Doubler). Figure 23. HLU-232 List 1D Status Display - Span 2 (2 Doublers). Page 73...
  • Page 74 Section 150-232-174 Revision 01 Figure 24. HLU-232 List 1D Status Display - Span 3 (2 Doublers). Figure 25. HLU-232 List 1D Set Clock Menu. Page 74...
  • Page 75 Section 150-232-174 Revision 01 Figure 26. HLU-232 List 1D Systems Settings Menu. Figure 27. HLU-232 List 1D Doubler Loopback Menu. Page 75...
  • Page 76 Section 150-232-174 Revision 01 Figure 28. HLU-232 List 1D Performance Data - Span 1 (1 or 2 Doublers). Figure 29. HLU-232 List 1D Performance Data - Span 2 (1 Doubler). Page 76...
  • Page 77 Section 150-232-174 Revision 01 Figure 30. HLU-232 List 1D Performance Data - Span 2 (2 Doublers). Figure 31. HLU-232 List 1D Performance Data - Span 3 (2 Doublers). Page 77...
  • Page 78 Section 150-232-174 Revision 01 Figure 32. HLU-232 List 1D Performance Data History - Span 1 (1 or 2 Doublers). Figure 33. HLU-232 List 1D Performance Data History - Span 2 (1 Doubler). Page 78...
  • Page 79 Section 150-232-174 Revision 01 Figure 34. HLU-232 List 1D Performance Data History - Span 2 (2 Doublers). Figure 35. HLU-232 List 1D Performance Data History - Span 3 (2 Doublers). Page 79...
  • Page 80 Section 150-232-174 Revision 01 Figure 36. HLU-232 List 1D Alarm History - Span 1 (1 or 2 Doublers). Figure 37. HLU-232 List 1D Alarm History - Span 2 (1 or 2 Doublers). Page 80...
  • Page 81 Section 150-232-174 Revision 01 Figure 38. HLU-232 List 1D Alarm History - Span 3 (2 Doublers). Figure 39. HLU-232 List 1D Main Menu for the Protection Line Unit. Page 81...
  • Page 82 Section 150-232-174 Revision 01 Figure 40. Protection Switch Configuration Menu Figure 41. Protection Mode Menu Page 82...
  • Page 83 Section 150-232-174 Revision 01 Figure 42. View Switchover History Copyright © 1996, PairGain Technologies, Inc. PairGain is a registered trademark, and HiGain is a trademark of PairGain Technologies. Page 83...

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