Nortel DMS-100 Series General Description Manual
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Nortel DMS-100 Series General Description Manual

Ringing system
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297-1001-131
DMS-100 Family
DMS-100 Ringing System
General Description
BASE15 and up
Standard
06.01
October 2000

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Summary of Contents for Nortel DMS-100 Series

  • Page 1 297-1001-131 DMS-100 Family DMS-100 Ringing System General Description BASE15 and up Standard 06.01 October 2000...
  • Page 3 Except as expressly authorized in writing by Nortel Networks, the holder is granted no rights to use the information contained herein.
  • Page 5 Publication history October 2000 BASE15 Standard 06.01 • Added Universal Edge 9000 (UEN) ringing information. March 2000 BASE14 Standard 05.01 • Added United Kingdom ringing configuration changes September 1999 BASE12 Standard 04.04 • added a ringing generator configuration change procedure for single line concentrating module configurations August 1999 BASE12 Standard 04.03...
  • Page 6 July 1998 BASE08 Standard 04.02 • added description of United Kingdom ringing and a limit on Distinctive Ringing Enhancements August 1997 BASE08 Standard 04.01 • added C3C distinctive ringing pattern information for Malaysia and Australia from feature AR2137 • updated description of revertive ringing, noting that revertive ringing is not supported for FSR lines August 1996 BCS36 Standard 03.05 incorporated editorial changes...
  • Page 7 October 1993 BCS36 Preliminary 03.01 • rearranged chapters • incorporated technical and editorial changes • updated section on LCMs in chapter 3. March 1991 BCS32 Standard 02.01 • included streamline information • converted document to new format September 1990 BCS31 Standard 01.07 •...

  • Page 9: Table Of Contents

    Contents About this document When to use this document xi How to check the version and issue of this document xi References in this document xi What precautionary messages mean xii How commands, parameters, and responses are represented xiii Input prompt (>) xiii Commands and fixed parameters xiii Variables xiii Responses xiv...
  • Page 10 viii Contents Ringing generator capacity 2-8 Ringing generator takeover and take back 2-9 LM and RLM ringing generator parameters 2-9 Ringing in Series II peripherals Ringing in the subscriber carrier module 3-1 SCM-100U 3-1 SCM-100U/RCU ringing configuration 3-2 Ringing hardware 3-3 SCM-100R 3-5 SCM-100R/RCT ringing configuration 3-5 Ringing hardware 3-7...
  • Page 11 Contents ix Assigning ringing to line concentrating modules 4-3 Setting up the LCM or RLCM ringing generators 4-3 Line cards 4-4 Table LCMINV 4-4 Assigning ringing to SCM-100R 4-4 Ringing generators 4-4 Line cards 4-5 Table RCTINV 4-5 Assigning ringing to SCM-100S 4-5 Ringing generators and line cards 4-5 Table RCSINV 4-5 Assigning ringing to SCM-100U 4-6...

  • Page 13: About This Document

    About this document When to use this document This document describes the DMS-100 ringing system. It is intended as a general reference for operating company personnel responsible for engineering, administration, and maintenance of the DMS-100 ringing system. How to check the version and issue of this document The version and issue of the document are indicated by numbers, for example, 01.01.

  • Page 14: What Precautionary Messages Mean

    • DMS-100 Provisioning Manual, 297-1001-450 • Peripheral Modules Maintenance Guide, 297-1001-592 • SMS Maintenance Manual, 297-8231-550 • SMU Maintenance Manual, 297-8241-550 • Hardware Description Manual, 297-8991-805 • DMS-1 Urban System Description, 363-2051-100 • DMS-1 Urban Circuit Pack Description, 363-2051-101 • SERVORD Reference Manual •...

  • Page 15: How Commands, Parameters, And Responses Are Represented

    xiii WARNING Possibility of equipment damage DANGER Damage to the backplane connector pins Align the card before seating it, to avoid bending the backplane connector pins. Use light thumb pressure to align the card with the connectors. Next, use the levers on the card to seat the card into the connectors.

  • Page 16: Responses

    Responses Responses correspond to the MAP display and are shown in a different type: FP 3 Busy CTRL 0: Command request has been submitted. FP 3 Busy CTRL 0: Command passed. The following excerpt from a procedure shows the command syntax used in this document: Manually busy the CTRL on the inactive plane by typing >BSY...

  • Page 17: 1 Dms-100 Ringing Overview

    1 DMS-100 ringing overview Introduction The DMS-100 ringing system performs automatic number identification (ANI) and coin functions and supports the following three ringing systems used in North America: • Bell Canada • Bell operating company (BOC) • Rural Electrification Association (REA) The DMS-100 ringing signal is based on a 6-second (s) cycle.

  • Page 18: Normal And Immediate Ringing

    1-2 DMS-100 ringing overview Figure 1-1 Illustration of a DMS-100 ringing cycle LME ringing cycle Ringing cycle (6 s) Time slot (500 milliseconds[ms]) LCE ringing cycle Ringing cycle (6 s) Time slot (500 ms) Subcycle Subcycle Subcycle Subcycle SCM ringing cycle Ringing cycle (6 s) Time slot...
  • Page 19 DMS-100 ringing overview 1-3 applies power ringing at the start of the next available ringing cycle. If power ringing can not be applied during the first time slot of a ringing cycle, the DMS-100 switch will try to schedule power ringing during the first time slot of the next ringing cycle.
  • Page 20 1-4 DMS-100 ringing overview Figure 1-2 Normal versus immediate ringing on 1FR line Ringing request received Ringing cycle 1 Ringing cycle 2 Ringing Ringing applied applied 1 2 3 4 5 9 10 11 0 1 2 3 4 5 9 1011 Normal Time slot 0 available.

  • Page 21: Ani And Coin Functions

    DMS-100 ringing overview 1-5 For example, in the following figure, ringing is enabled on the LCE, the first ringing burst applies at the beginning of time slot 1 and continues to the end of time slot 4. The initial ringing burst is 2 s. ANI and coin functions The DMS-100 ringing bus also provides voltages for ANI and coin functions.
  • Page 22 1-6 DMS-100 ringing overview The treatments for FSR revertive calls are defined in table TMTCNTL, subtable LNT, in the following tuples: • originator revertive multiparty frequency with three or more parties (ORMF) • originator revertive frequency with two parties (ORAF) •...
  • Page 23 DMS-100 ringing overview 1-7 The frequencies used in the frequency selective ringing scheme are as follows: • harmonic ringing: 16-2/3 Hz, 25 Hz, 33-1/3 Hz, 50 Hz, 66-2/3 Hz • synchromonic ringing (20 Hz base): 20 Hz, 30 Hz, 42 Hz, 54 Hz, 66 Hz •...
  • Page 24 1-8 DMS-100 ringing overview Harmonic ringing The following figure illustrates the relationship of the harmonic ringing signals with the ringing cycle. Figure 1-5 Harmonic ringing FrequencyA 2 2 5 5 H H z z (1 party) 1 1 . . 9 9 5 5 s s 3 3 3 3 - - - -1 1 / / 3 3 H H z z (seenote) FrequencyB...

  • Page 25: Superimposed Ringing

    DMS-100 ringing overview 1-9 Note: Available frequencies are 20 Hz, 30 Hz, 40 Hz, 50 Hz, and 60 Hz. Any four of these, in any order, can be assigned to frequencies A through D. Superimposed ringing Superimposed ringing is a form of selective ringing which uses a positive or negative biased 20 Hz ringing signal and polarizing devices, such as gas tubes, at the receiving end for full or semi-ringer selection.
  • Page 26 1-10 DMS-100 ringing overview Revertive calls (calls from a subscriber on a multiparty line to another subscriber on the same party line) are permitted in the superimposed scheme. The calling party receives revertive ringing while the called party is being rung if the calling party is on the opposite side, tip or ring, of the called party, or the calling party is on the same side but with the opposite polarity of the called party.
  • Page 27 DMS-100 ringing overview 1-11 Figure 1-8 Call on multiparty superimposed ringing line 1. Calling party (party 2) goes off-hook and dials called party (party 4). (see note 1) Party 1 Party 2 Ring Party 3 Party 4 2. The called party (party 4) receives negative-biased ringing signal. Party 1 Party 2 Ring...
  • Page 28 1-12 DMS-100 ringing overview The dc component of the superimposed ringing signal determines the ringer selection. The following table lists the values of both the ac and dc components of the superimposed ringing signals. Table 1-1 Superimposed ringing signal - ac and dc components> Frequency (Hz) The following figures illustrate the relationship between the ringing signal and the DMS-100 ringing cycle.
  • Page 29 DMS-100 ringing overview 1-13 Figure 1-10 LCE superimposed revertive ringing with immediate ring enabled 0.48 s 0.46 s 0.92 s 10 11 Even LSGs 1, 2 party 3, 4 party Negativerevertive splash Positive revertive splash ANI/coin (Any available slot) 10 11 Figure 1-11 LCE superimposed revertive ringing with no immediate ring 0.5 s --48V 1FR,...
  • Page 30 1-14 DMS-100 ringing overview Figure 1-12 LCE superimposed revertive ringing with immediate ring enable 0.5 s --48V 2FR code 1 +48V 2FR code 1 --48V multi- party code 2 +48V multi- party code 2 Revertive splash --48V Revertive splash +48V ANI/coin For the LCM of the LCE frame/cabinet with coded immediate ringing and the central control (CC) Patch TLA67, power ringing will be applied within 0.5 s...

  • Page 31: Coded Ringing

    DMS-100 ringing overview 1-15 Figure 1-13 LCE superimposed revertive ringing with immediate ring enable 0.5 s (Ring pty) Note 1: CC Patch TLA67 does not allow the use of NT6X17 line cards for 2-party lines in the office. Note 2: ANI/coin will use any available slots. Coded ringing Coded ringing is used on multiparty lines to distinguish individual parties from other parties on the tip or ring side of the line.
  • Page 32 1-16 DMS-100 ringing overview Figure 1-14 Ringing on multiparty coded ringing line I I n n c c o o m m i i n n g g c c a a l l l l t t o o p p a a r r t t y y 1 1 Party 1 Party 2 Party 3 Party 4 Ring...
  • Page 33 DMS-100 ringing overview 1-17 OFCENG. Office parameter REVRING is described in Office Parameters Reference Manual. The following figure illustrates the sequence of events that occurs when a revertive call is made on a coded ringing, multiparty line. Figure 1-15 Revertive call on coded ringing multiparty line 1.
  • Page 34 1-18 DMS-100 ringing overview The following ringing codes are used in the coded ringing scheme: • ring party, 1R, 2FR • tip party, 2FR • multiparty, code 1 • multiparty, code 2 • multiparty, code 3 distinctive ring • multiparty, code 4 •...

  • Page 35: Distinctive Ringing

    DMS-100 ringing overview 1-19 Figure 1-16 LME/LCE coded ringing patterns - immediate ring disabled 10 11 Ring party, 1R, 2FR Tip party, 2FR Multiparty, code 1 Multiparty, code 2 Multiparty, code 3 Distinctive ringing Multiparty, code 4 Multiparty, code 5 Rev splash ring party Rev splash tip party ANI/coin...
  • Page 36 1-20 DMS-100 ringing overview Figure 1-17 LME/LCE coded ringing patterns with immediate ring enabled 10 11 Ring party, 1R, 2FR Tip party, 2FR Multiparty, code 1 Multiparty, code 2 Multiparty, code 3 Distinctive ringing Multiparty, code 4 Multiparty, code 5 Rev splash ring party Rev splash tip party ANI/coin...
  • Page 37 DMS-100 ringing overview 1-21 Distinctive ringing is supported by the coded ringing, decimonic scheme at 20 Hz, and the REA frequency selective scheme at 30 Hz. The following figures illustrate the relationship between the distinctive ringing signals and the DMS-100 ringing cycle for the coded ringing and frequency selective ringing schemes.
  • Page 38 1-22 DMS-100 ringing overview Figure 1-19 Distinctive ringing patterns - frequency selective scheme 0.5 s 1.5 s 10 11 1 party, 1FR Code 3 Code 4 Code 5 ANI/coin 10 11 Note: Coded 30 Hz ringing for LMEs does not support 2/4/8/10 multiparty or revertive ringing.
  • Page 39 DMS-100 ringing overview 1-23 Figure 1-20 Distinctive ringing patterns for the C3C ringing type 0.20 s O O n n O O f f f f O O n n O O f f f f Standard 0.4 s 0.2 s 0.4 s 2.0 s O O n n...
  • Page 40 1-24 DMS-100 ringing overview In the teen ringing configuration, a primary directory number (PDN) and up to three secondary directory numbers (SDN) are assigned to a subscriber's line. When the PDN is called, standard 1FR ringing is applied to the line (2-s ring, 4-s silence).
  • Page 41 DMS-100 ringing overview 1-25 Figure 1-22 Teen ringing - coded ringing scheme 2 2 s s PDN (1FR) 1 1 s s 1 1 s s SDN 1 0 0 . . 5 5 s s 1 1 s s 0 0 .
  • Page 42 1-26 DMS-100 ringing overview ringing and feature ringing. Note that some values of ON and OFF have a +/-0.0625 second range caused by hardware use in the LCM layer. The earlier C3D ring patterns change as a result of the conversion to the new time slot format.
  • Page 43 DMS-100 ringing overview 1-27 Figure 1-24 Ringing patterns 0.25 s O O n n O O f f f f O O n n O O f f f f 1.0 s 2.0 s 1.0 s 2.0 s O O f f f f O O n n O O n n O O f f f f...
  • Page 44 1-28 DMS-100 ringing overview Figure 1-25 Ringing patterns (cont'd) 0.25 s N N O O T T U U S S E E D D O O n n Continuous N N O O T T U U S S E E D D O O n n O O f f f f O O n n...
  • Page 45 DMS-100 ringing overview 1-29 United Kingdom ringing United Kingdom ringing is ring type C3C, based on a total cycle time of 3.0 s. Standard United Kingdom ringing is ring code 0, shown in the following table. Table 1-3 Standard United Kingdom Ringing Ring code 0.4 s 0.2 s...
  • Page 46 1-30 DMS-100 ringing overview Figure 1-26 United Kingdom Ringing patterns 0.2s O O n n O O n n O O f f f f 0.4 s 0.4 s 2.0 s O O n n O O n n O O f f f f 0.8 s 0.2 s 1.
  • Page 47 DMS-100 ringing overview 1-31 Figure 1-27 United Kingdom distinctive ringing patterns 0.2s O O n n O O n n O O f f f f 0.8 s 0.2 s 1.8 s O O n n O O n n O O f f f f 0.7 s 0.7 s...

  • Page 48: Ringing Characteristics

    1-32 DMS-100 ringing overview Ringing characteristics The following tables provide a summary of DMS-100 switch ringing characteristics according to PM type. Table 1-4 Summary of ringing in peripheral modules (Sheet 1 of 2) PM type RG PEC Ring type supported Maximum lines ring LMC RLM NT2X27...
  • Page 49 DMS-100 ringing overview 1-33 Table 1-4 Summary of ringing in peripheral modules (Sheet 2 of 2) PM type RG PEC Ring type supported Maximum lines ring NTNP44 20 Hz single party 16 ADSL DMT Combo Line cards per shelf/ 4 loops each for a total of Coded 64 loops in shelf.
  • Page 50 1-34 DMS-100 ringing overview Table 1-5 Ringing generator parameters - NT2X27 (Sheet 2 of 2) Ringing type RG PEC Frequency Voltage Maximum ring lines Synchromonic 16 NT2X27AD 20 Hz 87 V ac 16 Hz 105 V ac 30 Hz 110 V ac 42 Hz 115 V ac 54 Hz...
  • Page 51 DMS-100 ringing overview 1-35 Table 1-6 Ringing generator parameters - NT6X30 (Sheet 2 of 2) Ringing type RG PEC Frequency Voltage Maximum ring lines Harmonic NT6X30AA 20 Hz 87 V ac 16.67 Hz 105 V ac 25 Hz 110 V ac 33.33 Hz 115 V ac 50 Hz...
  • Page 52 1-36 DMS-100 ringing overview The following table provides a summary of NT6X60 ringing generator parameters. Table 1-7 Ringing generator parameters - NT6X60 (Sheet 1 of 2) Ringing type RG PEC Frequency Voltage Maximum ring line Bell (86 V) NT6X60AA 20 Hz -52 V dc 24 - 28 20 Hz...
  • Page 53 DMS-100 ringing overview 1-37 Table 1-7 Ringing generator parameters - NT6X60 (Sheet 2 of 2) Ringing type RG PEC Frequency Voltage Maximum ring line Synchromonic NT6X60AA 20 Hz 87 V ac 20 Hz 105 V ac 30 Hz 110 V ac 42 Hz 115 V ac 54 Hz...
  • Page 54 1-38 DMS-100 ringing overview The following table provides a summary of ringing generator power specifications in the NTNP50 POTS 32 line card. Table 1-9 Ringing generator power specifications - NTNP50 Parameter Minimum Nominal Maximum Units Supply Voltage V dc Supply Current Amps The following table provides a summary of the compatibility of DMS-100 ringing types.

  • Page 55: Provisioning Ringing Generators

    DMS-100 ringing overview 1-39 Provisioning ringing generators This section describes considerations that must be given to ringing when provisioning DMS-100 lines peripherals. You can find guidelines for provisioning lines peripheral modules by referring to the Provisioning Manual. When assigning lines to line peripherals, pay close attention to the number and type of lines assigned to each peripheral to prevent ringing generator overload conditions.
  • Page 56 1-40 DMS-100 ringing overview Figure 1-28 Ringer configurations B B r r i i d d g g e e d d r r i i n n g g i i n n g g Ringing voltage appears across tip and ring leads T T i i p p r r i i n n g g i i n n g g Ringing voltage appears across tip...

  • Page 57: Audible Ring Back Signal

    DMS-100 ringing overview 1-41 Audible ring back signal Audible ring back indicates to the calling party the called party is being rung. For all calls, the ring back signal is generated by the tone card in the peripheral unit hosting the calling party. The ring back signal in the DMS-100 switch operates on a 6-s cycle, which is similar to but independent of the ringing cycle.

  • Page 58: Ringing In The Uen

    1-42 DMS-100 ringing overview Figure 1-30 Timing of audible and power ringing signals - immediate ringing enabled 1 ringing cycle 1 2 3 4 5 91011 0 1 2 3 4 5 9 1011 Power ring (LME coded and superimposed ringing or LCM coded ringing) Power ring...

  • Page 59: Ringing In Series I Peripherals

    2 Ringing in Series I peripherals Ringing types supported by LM and RLM As mentioned previously, Series I peripherals are nonconcentrating. This class of peripherals includes the line module (LM) and the remote line module (RLM). This part of this document describes the ringing system in the LM and RLM.

  • Page 60: Lm And Rlm Ringing Hardware

    2-2 Ringing in Series I peripherals Figure 2-1 Series I peripheral ringing system architecture Bay 0 Bay 1 Signal processor Signal processor RGI 0 RGI 1 RGI 0 RGI 1 RGI–0 RGI–1 RGI–0 RGI–1 LC 0 LC 31 LC 0 LC 31 Line drawer 0–19 Line drawer 0–19...

  • Page 61: Line Module Power Converter

    Ringing in Series I peripherals 2-3 • synchromonic MF - NT2X27AE • 20 Hz BOC coded ringing (105 V RMS) - NT2X27AF The RGI card also monitors ring generator output levels and reports any problems to the line module controller (LMC) through the signaling processor (SP).

  • Page 62: Lm And Rlm Processors Associated With Ringing

    2-4 Ringing in Series I peripherals LM and RLM processors associated with ringing The following LM/RLM processors are associated with ringing: • master processor • CC message processor • signal processor The following figure illustrates a simplified block diagram of the relationship of these processors with the ringing function of the LM and RLM.

  • Page 63: Sp And Rgi Interactions

    Ringing in Series I peripherals 2-5 Master processor The LM and RLM master processor is the main processor. It contains the software that performs the tasks requested by the DMS-100 CC. Under the direction of the DMS-100 CC, the master processor directs the activities of the subordinate processors in the LM and RLM.

  • Page 64: Ringing Takeover

    2-6 Ringing in Series I peripherals maintained as long as the signal processor and RGI in each bay operate properly. Ringing takeover If a fault occurred in the signal processor or RGI in either bay, the mate bay would take over the ringing control function in both bays. If a fault occurred in the RGI of bay 1, for example, the LM or RLM would report the fault to the DMS-100 CC.

  • Page 65: Ringing Take Back

    Ringing in Series I peripherals 2-7 Figure 2-4 Takeover configurations in LM/RLM S S t t a a t t e e 2 2 Bay 0 takes over Bay 1. RG 1 (Bay 1) is in-service Bay 0 Bay 1 RGI card RGI card NOT IN USE...

  • Page 66: Ringing Generator Capacity

    2-8 Ringing in Series I peripherals If operating company personnel repair the RGI fault and return the unit to service, the DMS-100 CC, upon seeing that the RGI is now in-service, issues a take back command to the LM or RLM controller. In response, the LM or RLM controller disconnects the bay 0 RGI link to the bay 1 ringing generator over the crossover link and reconnects it to the other ringing generator in its own bay.

  • Page 67: Ringing Generator Takeover And Take Back

    Ringing in Series I peripherals 2-9 Ringing generator takeover and take back Both ringing generators in each bay provide ringing signals for the lines in the LM or RLM bay. The signal processor and RGI program the ringing generators and, through the ring multiplexer, connect each ringing generator output to the appropriate line.

  • Page 69: Ringing In Series Ii Peripherals

    3 Ringing in Series II peripherals Ringing in the subscriber carrier module This chapter describes the ringing systems in DMS-100 peripherals belonging to the subscriber carrier module (SCM) and the line concentrating module (LCM) families. The SCM is a family of lines peripherals that provides a digital interface between the DMS-100 and the subscriber loop concentrator of the subscriber carrier system.

  • Page 70: Scm-100U/Rcu Ringing Configuration

    3-2 Ringing in Series II peripherals The SCM-100U was introduced into the DMS-100 by feature package NTX387. You can find documentation on the SCM-100U by referring to the SMU Maintenance Manual Ringing types supported by SCM-100U The SCM-100/RCU system supports the following types of ringing: •...

  • Page 71: Ringing Hardware

    Ringing in Series II peripherals 3-3 Ringing hardware The SCM-100U/RCU ringing system involves the hardware components listed in the following table. Table 3-1 SCM-100U ringing hardware Peripheral Component PEC Component Name SCM-100U NTMX77 Unified processor NT6X80 Ring/pad NT6X85 DS-1 interface NT3A86 DS-1 interface NT3A31...
  • Page 72 3-4 Ringing in Series II peripherals RCU components associated with ringing A detailed functional description of the circuit cards in the RCU is in DMS-1 Urban Circuit Pack Descriptions. A very brief description of the RCU components associated with ringing is in the following table. Table 3-3 RCU ringing hardware component description Component Description...

  • Page 73: Scm-100R

    Ringing in Series II peripherals 3-5 In the event that the monitor circuit detects a fault, the monitor and alarm circuit raises a ringing generator alarm and operates the switchover relays to switch the standby ringing generator to the active ringing generator. The monitor and alarm circuit then activates a shut-down circuit in the faulty ringing generator, which disconnects the faulty generator from the power source and lights the shut-down light-emitting diode (LED) on the ringing...
  • Page 74 3-6 Ringing in Series II peripherals Figure 3-2 SCM-100R/RCT ringing configuration S S C C M M - - 1 1 0 0 0 0 R R Master Ring/pad processor Protection link R R C C T T Protection link Protection switch Digroup A/B Digroup A/B RCT control...

  • Page 75: Ringing Hardware

    Ringing in Series II peripherals 3-7 Ringing hardware The SCM-100R/RCT hardware is listed in the following table. Table 3-4 SCM-100R/RCT ringing hardware Peripheral Component PEC Component Name SCM-100R NT6X45 Unified processor NT6X80 Ring/pad NT6X50 DS-1 interface QPP436, QPP437 DS-1 repeaters QPP428, QPP498 Protection switch QPP419...

  • Page 76: Rct Ringing Hardware

    3-8 Ringing in Series II peripherals Table 3-5 SCM-100R ringing hardware component description (Sheet 2 of 2) Component Description NT6X80 Ring/pad. The ring/pad circuit card provides PCM samples of ringing signals. The control complex, upon determining the type of ringing required for a given line, accesses the sample PCM signal from the ring/pad card memory.

  • Page 77: Ringing Generator Capacity

    Ringing in Series II peripherals 3-9 Ringing generator capacity Following are the capacities for the RCT ringing generators. • QPP426—20 ringers/5 lines at a time • QPP435—21 ringers/5 lines at a time • QPP430—20 ringers/5 lines at a time Ringing generator takeover The RCT can be provisioned with backup ringing generators and power converters.

  • Page 78: Scm-100S Ringing Hardware

    3-10 Ringing in Series II peripherals Figure 3-3 SCM-100S/RCS ringing configuration S S C C M M - - 1 1 0 0 0 0 S S Master R R C C S S processor Protection link Ring/pad SCM-100S ringing hardware The SCM-100S/RCS hardware is listed in the following table.

  • Page 79: Rcs Hardware

    Ringing in Series II peripherals 3-11 The following table contains brief functional descriptions of the ringing hardware associated with the SCM-100S/RCS ringing. A detailed description of the SCM-100S hardware can be found in the SMS Maintenance Manual Table 3-8 SCM-100R ringing hardware component description Component Description NT6X45...
  • Page 80 3-12 Ringing in Series II peripherals Also on each shelf is a control complex made up of a power converter, processor, and digroup control card; the term unit is used to describe this control complex. When both units are in-service, unit 0 supports the even-numbered logical drawers in the LCM.
  • Page 81 Ringing in Series II peripherals 3-13 Figure 3-4 LCE frame Ringing generator0 Ringing generator1 NT6X30 NT6X30 Fuses RA and RB Baffle Unit 1 +15V –48V RA RB Drwr 11 Drwr 13 Drwr 15 Drwr 17 Drwr 19 Drwr 10 Drwr 12 Drwr 14 Drwr 16 Drwr 18 Shelf 55...

  • Page 82: Types Of Ringing Supported

    3-14 Ringing in Series II peripherals Ringing generator control The LCM is provisioned with two ringing generators. Each unit of the LCM can connect to either ringing generator. The SWRG command available at the MAP terminal switches a unit or both units from one ringing generator to the other.
  • Page 83 Ringing in Series II peripherals 3-15 The following paragraphs describe the function of LCM hardware components only as they relate to the LCM ringing system. NT6X51 processor The NT6X51 processor card schedules ringing and controls the relays on the power converter card (NT6X53), the bus interface card (NT6X54), and the line card.
  • Page 84 3-16 Ringing in Series II peripherals NT6X54 bus interface The NT6X54 bus interface card (BIC) multiplexes and demultiplexes PCM samples and control messages to and from the LCM line cards over the 32-channel digroups. It also contains relays that switch ringing or ANI/coin voltages to the line cards.

  • Page 85: Detailed Ringing Schematic

    Ringing in Series II peripherals 3-17 Detailed ringing schematic The schematic in theFigure 3-6, "Detailed ringing schematic" on page 3-18 shows the signal path from the ringing generators to the line drawers located in both units of the LCM. This signal path includes the NT6X53AA power converters in both LCM units and the NT6X54AA BICs in the line drawers.
  • Page 86 NT6X54AA in drawers 10–19 6X53AAin Unit 1 K4 K9 Ring bus Odd LSG K3 K2 –48V +48V Ring bus –130V Even LSG +130V Current 50A–54A detector 50B–54B 55A–59A 55B–59B NT6X54AA in drawers 0–9 Ring bus 6X53AAin Unit 0 Odd LSG K4 K9 Ring bus Even LSG...

  • Page 87: Ringing Signals

    Ringing in Series II peripherals 3-19 Ringing signals Ringing and ANI/coin voltages enter the LCM through the NT6X53 power converter. Relays on the power converter provide a control function for ringing that is completely independent of the power supply function. Relay K4 on the NT6X53 power converter selects between the ringing voltages provided by the two ringing generators (see Figure 3-6, "Detailed ringing schematic.").
  • Page 88 3-20 Ringing in Series II peripherals This normally low bit goes high to indicate a low ringing voltage condition. This occurrence indicates a trouble condition to which the system will respond. RG 0 provides ANI/coin voltages to the even-numbered units (unit 0 of both LCMs) in the LCE frame.

  • Page 89: Ani/Coin Signals

    Ringing in Series II peripherals 3-21 ANI/coin signals ANI/coin signals are transmitted from the NT6X53 on a two-wire bus, but, unlike bridged ringing signals, they are not returned in the loop. Instead ANI/coin signals are directed to ground at the subscriber premises and current is recovered at the ground window of the central office.

  • Page 90: Ringing Process

    3-22 Ringing in Series II peripherals Ringing process The LCM/RLCM ringing process performs the following tasks: • ringing synchronization • ringing generator output zero-crossing detection • ringing scheduling Ringing synchronization task The ringing synchronization task performs the following functions: • waits for messages from the ringing schedule task to operate or release ringing relays •...

  • Page 91: Ringing And Ani/Coin Messaging

    Ringing in Series II peripherals 3-23 Upon receiving a ANI/coin cancel message, the ringing schedule task sends a message to the ringing synchronization task instructing it to release the ANI/coin voltage relay from the line. Ringing and ANI/coin messaging Ringing and ANI/coin requests that are queued by the ringing schedule task are processed by a ringing state machine or ANI/coin state machine that is driven by the ringing schedule task.

  • Page 92: Ringing Sequence Flowchart

    3-24 Ringing in Series II peripherals to the time slot corresponding to the subcycle transition. This ensures that the time slot transitions are synchronized with the subcycle transitions. Ringing sequence flowchart This section describes the sequence of events that occur in the ringing processes of the LCM during normal operation (non-ESA).
  • Page 93 Ringing in Series II peripherals 3-25 Figure 3-8 LCM ringing sequence diagram D D M M S S - - 1 1 0 0 0 0 C C C C L L C C M M Sends ringing request Ringing schedule task verifies request is directed to message indicating line valid line and channel is associated with line to be rung...

  • Page 94: Ringing Generator Configuration Change Procedure

    3-26 Ringing in Series II peripherals Ringing generator configuration change procedure Follow this procedure to change the ringing configuration in host and remote line concentrating module (LCM) configurations. During this procedure, the LCM units enter an in-service trouble (ISTb) state because of ringing cadence differences.
  • Page 95 Ringing in Series II peripherals 3-27 Figure 3-9 Summary of Dual LCM ringing generator configuration change procedure This flowchart provides a Check the summary of the procedure. configurationin table LCMINV Use the instructions in the step-action procedure that follows this flowchart to Post the LCM perform the procedure.
  • Page 96 3-28 Ringing in Series II peripherals Procedure 3-1 Dual LCM ringing generator configuration change procedure At the MAP terminal To access table LCMINV, type > TABLE LCMINV and press the Enter key. To position on the tuple for the first LCM, type >...
  • Page 97 Ringing in Series II peripherals 3-29 To post the the first LCM in the frame or cabinet, type > POST LCM 0 0 and press the Enter key. Example of a MAP display: SysB ManB OffL CBsy ISTb InSv HOST 00 0 InSv Links_OOS: CSide 0 , PSide...
  • Page 98 3-30 Ringing in Series II peripherals SysB ManB OffL CBsy ISTb InSv HOST 00 0 InSv Links_OOS: CSide 0 , PSide Unit0: InSv Takeover /RG: 0 Unit1: ManB /RG: 0 RG: Pref 1 InSv Drwr: Stby 0 InSv bsy unit 1 LCM HOST 00 1 Unit 1 Bsy Passed Note: It is necessary to busy the unit so that the mate unit enters a...
  • Page 99 Ringing in Series II peripherals 3-31 Note: Perform this step for each LCM unit that needs to use RG-0. The result of switching ringing generators will result in a MAP terminal display like the following. Example of a MAP display: SysB ManB OffL...
  • Page 100 3-32 Ringing in Series II peripherals Top view 12345678 12345678 12345678 12345678 Locking lever tabs N N o o t t e e : “On” and “Off” settings for DIP Faceplate switches can differ among ringing generators. Reseat RG-1 and restore power. At the MAP terminal To quit the PM level of the MAP terminal, type >...
  • Page 101 Ringing in Series II peripherals 3-33 Enter Y to continue processing the change request and press the Enter key. Example of a MAP responce: LCMTYPESEL: LCM Example of a MAP responce: Press the Enter key to leave this entry as it is. Example of a MAP responce: RGEQUIP: Y Press the Enter key to leave this entry as it is.
  • Page 102 3-34 Ringing in Series II peripherals To exit table LCMINV, type > QUIT ALL and press the Enter key. To enter the PM level of the MAP terminal, type > MAPCI;MTC;PM and press the Enter key. To post the first LCM and return it to service, type >...
  • Page 103 Ringing in Series II peripherals 3-35 To post the first LCM, type > POST LCM 0 0 and press the Enter key. Are the units in the LCM aliged to use RG-1? If both LCM units are aligned and both use RG-1 Step 38 are not aligned or both do not Step 37...
  • Page 104 3-36 Ringing in Series II peripherals At the LCE frame/cabinet WARNING Static electricity damage Before removing any cards, put on a wrist strap and connect it to the wrist strap grounding point on the left side of the frame supervisory panel of the LCM.

  • Page 105: Single Lcm Configuration

    Ringing in Series II peripherals 3-37 To test the LCM units, type > POST LCM 0 0 and press the Enter key. > TST UNIT 0 and press the Enter key. > POST LCM 0 1 and press the Enter key. >...
  • Page 106 3-38 Ringing in Series II peripherals Figure 3-10 Summary of Single LCM ringing generator configuration change procedure This flowchart provides a Check the summary of the procedure. configurationin table LCMINV Use the instructions in the step-action procedure that follows this flowchart to Post the LCM perform the procedure.
  • Page 107 Ringing in Series II peripherals 3-39 Procedure 3-2 Single LCM ringing generator configuration change procedure At the MAP terminal To access table LCMINV, type > TABLE LCMINV and press the Enter key. To position on the tuple for the LCM, type >...
  • Page 108 3-40 Ringing in Series II peripherals SysB ManB OffL CBsy ISTb InSv RLCM 00 0 InSv Links_OOS: CSide 0 , PSide Unit0: InSv /RG: 0 Unit1: InSv /RG: 0 RG: Pref 0 InSv Drwr: Stby 1 InSv Both units use ringing generator 0 (RG-0). Are the units in the LCM aligned to use RG-0? If both LCM units are aligned and both use RG-0...
  • Page 109 Ringing in Series II peripherals 3-41 At the frame WARNING Static electricity damage Before removing any cards, put on a wrist strap and connect it to the wrist strap grounding point on the left side of the frame supervisory panel of the LCM. This protects the equipment against damage caused by static electricity.
  • Page 110 3-42 Ringing in Series II peripherals Reseat RG-1 and restore power. At the MAP terminal To quit the PM level of the MAP terminal, type > QUIT ALL and press the Enter key. To access table LCMINV, type > TABLE LCMINV and press the Enter key.
  • Page 111 Ringing in Series II peripherals 3-43 To exit table LCMINV, type > QUIT ALL and press the Enter key. To access the PM level of the MAP terminal, type > MAPCI;MTC;PM and press the Enter key. To post and return to service the LCM unit, type >...
  • Page 112 3-44 Ringing in Series II peripherals At the frame WARNING Static electricity damage Before removing any cards, put on a wrist strap and connect it to the wrist strap grounding point on the left side of the frame supervisory panel of the LCM. This protects the equipment against damage caused by static electricity.

  • Page 113: Ringing In The Universal Edge 9000

    Ringing in Series II peripherals 3-45 Ringing in the Universal Edge 9000 The architecture of the POTS functionality in the Universal Edge 9000 (UEN) borrows heavily from the LCM. This is because the time division multiplexing (TDM) software functions the same as that of the LCM in the DMS-100 system.
  • Page 114 3-46 Ringing in Series II peripherals Figure 3-11 UEN shelf and line card layout UEN 3 00 01 02 03 04 05 06 07 09 10 11 12 13 14 15 UEN 2 00 01 02 03 04 05 06 07 09 10 11 12 13 14 15 UEN 1 00 01 02 03...

  • Page 115: Ringing In The Remote Line Concentrating Module

    Ringing in Series II peripherals 3-47 Ringing in the Remote Line Concentrating Module The Remote Line Concentrating Module (RLCM) is a repackaged LCM located remotely from the central office and connected to it by DS-1 links. The RLCM consists of the following components: •...

  • Page 117: Administration Of Dms Ringing

    4 Administration of DMS ringing Assigning ringing to line modules This section describes the administration of the DMS-100 ringing system. Administration of the ringing system involves assigning ringing types to peripheral modules (PM) by datafilling the inventory tables in the DMS-100 data store (DS).

  • Page 118: Ringing Generators

    4-2 Administration of DMS ringing Ringing generators Following is a list of the LME and RLE ringing generators and the ringing types each supports: • NT2X27AA - coded and superimposed • NT2X27AB - decimonic and coded (30 Hz) • NT2X27AC - harmonic •...

  • Page 119: Assigning Ringing To Line Concentrating Modules

    Administration of DMS ringing 4-3 the SERVORD Reference Manual. Information regarding the relationship between line cards and ringing types is summarized in the following table. Table 4-1 Line class codes by line card type and ring code Superimposed Frequency Ringers Coded ringing ringing selective...

  • Page 120: Line Cards

    4-4 Administration of DMS ringing Line cards As with the LM and RLM, the LCM and RLCM must contain line cards that support the ringing type assigned to them. The LCM and RLCM use the same line cards as the LM and RLM. The table "Line class codes by line card type and ring code"...

  • Page 121: Line Cards

    Administration of DMS ringing 4-5 Line cards The RCT uses the following line cards: • QPP405 - single party remote • QPP497 - universal remote • QPP409 - universal coin remote • QPP440 - frequency selective remote • QPP445 - superimposed remote •...

  • Page 122: Assigning Ringing To Scm-100U

    4-6 Administration of DMS ringing Assigning ringing to SCM-100U Assigning ringing to the SCM-100U involves installing the proper ringing generators and line cards at the DMS-100U and datafilling table RCUINV. Ringing generator The remote concentrator terminal (RCT) uses the NT3A39 ringing generator, which supports single-party 20 Hz ringing and multiparty coded ringing.

  • Page 123: Setting Immediate Ring Enable

    Administration of DMS ringing 4-7 cards on the appropriate PM and by using SERVORD to affect the changes. A description of SERVORD is in the SERVORD Reference Manual. Setting immediate ring enable Immediate ring enable can be enabled or disabled by setting parameter IMMEDIATE_RING_ENABLE in table OFCENG to Y (yes) or N (no).

  • Page 124: Table Lmrng

    4-8 Administration of DMS ringing Table LMRNG Table LMRNG defines the ringing type for each LM or RLM. Coded 30 Hz ringing is required for distinctive ringing. Entering the C30 in the LMRNG_SELECTOR field will provide the coded 30 Hz ringing for the LM or RLM.

  • Page 125: Ringing System Maintenance

    5 Ringing system maintenance Ringing user interface The DMS-100 user interface allows ringing generators to be serviced from the DMS-100 MAP terminal. Commands at the PM level of the MAP terminal allow the ringing generators of most line PMs to be posted, manually busied, tested, returned to service, and be made offline.

  • Page 126: Rg Overload Control - Series Ii Peripherals

    5-2 Ringing system maintenance RG overload control - Series II peripherals Series II peripherals are all of the LCM-based peripherals. As with the Series I peripherals, the ringing bus on the Series II peripherals is monitored by current and voltage monitors, which react when current and voltage thresholds on the ringing bus are exceeded.
  • Page 127 Ringing system maintenance 5-3 determine if the ringing trip was valid. If the line is found to be on-hook after ringing trip, the DMS-100 switch generates a pre-trip log report. To reduce the possibility of these spurious signals from being interpreted as a valid answer, the duration of the off-hook signal considered as a valid off-hook has been changed throughout the development of the DMS-100 switch.
  • Page 128 5-4 Ringing system maintenance When ringing occurs, the line card is instructed to encode the ringing waveform instead of the transmit voice signal. The line card then sends a digital representation of the ringing waveform through PCM data to the PM software.

  • Page 129: Ringing Generator Status

    Ringing system maintenance 5-5 situation, the ringing resources are tied up unnecessarily for the duration of RNG_TMEOUT_NO_OF_SEC, when other ringing requests may be blocked. To avoid this, set RNG_TMEOUT_NO_OF_SEC to as short a period as practical. Bad CP IO msg The bad-CP-IO-msg log accompanies LINE logs 205, 205, and 206.

  • Page 130: Ringing Generator Alarms

    5-6 Ringing system maintenance PM Type: LCM Int. No.: 2 Status index: 0 Node_No: 36 Memory Size - Unit 0: 256K , Unit 1: 256K Loadnames: LCMINV - BBB , Unit0: XLCM05AK, Unit1: XLCM05AK LCM HOST 00 0 is included in the list of LCM types scheduled for a REX test.
  • Page 131 Ringing system maintenance 5-7 In addition to the DMS-100 MAP terminal, feature package NTX215 allows a DMS-100 to be monitored by a No. 2 SES. This feature can be used to monitor calls through the DMS-100 to isolate intermittent ringing problems. DMS-100 Family DMS-100 Ringing System BASE15 and up...
  • Page 134 Nortel Networks and is strictly confidential. Except as expressly authorized in writing by Nortel Networks, the holder shall keep all information contained herein confidential, shall disclose the information only to its employees with a need to know, and shall protect the...

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