Nortel DMS-100 Series Operating and maintenance instructions

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

DMS-100 Family
DMS-100 Ringing System
General Description
Publication number: 297-1001-131
Product release: BASE15 and up
Document release: Standard 06.01
Date: October 2000
Copyright © 1990, 1991, 1993, 1994, 1995, 1996, 1998, 1999, 2000 Nortel Networks,
All Rights Reserved
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holder is granted no rights to use the information contained herein.
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Nortel Networks.

DMS-100 Family DMS-100 Ringing System BASE15 and up
iii
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
• changed description of Japan ringing type C3D from feature AU3458
• included an illustration of United Kingdom distinctive ringing cadences
• added a ringing generator configuration change procedure

iv
297-1001-131 Standard 06.01 October 2000
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
August 1995 BCS36 Standard 03.04 incorporated editorial changes
April 1995 BCS36 Standard 03.03
• added note in chapter 1 for setting office parameters
IMMEDIATE_RING_ENABLE and
ALLOW_RINGING_ON_TIP_SIDE with regard to immediate ringing
functionality.
• added information about response to the QUERYPM command at the
MAP terminal for LCMs when in no-display mode. The switch provides
operating company personnel the status of the ringing generators in a
posted LCM.
December 1993
BCS36 Standard 03.02
• incorporated editorial changes
• removed low-level software descriptions of ringing functionality

v
DMS-100 Family DMS-100 Ringing System BASE15 and up
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
• added NT2X27AE ringing generator interface (RGI) to the list of RGIs in
the Line Module/Remote Line Module description.
• added statement indicating that an NT2X27AB is required when using
CODED C30 ringing and an NT2X27AA is required when using CODED
C ringing.

DMS-100 Ringing System
vii
Contents
About this document xi
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
1 DMS-100 ringing overview 1-1
Introduction 1-1
Normal and immediate ringing 1-2
ANI and coin functions 1-5
Types of ringing 1-5
Frequency selective ringing 1-5
Superimposed ringing 1-9
Coded ringing 1-15
Distinctive ringing 1-20
Ringing characteristics 1-32
Provisioning ringing generators 1-39
Ringer configurations 1-39
Audible ring back signal 1-41
Ringing in the UEN 1-42
2 Ringing in Series I peripherals 2-1
Ringing types supported by LM and RLM 2-1
LM and RLM ringing configuration 2-1
LM and RLM ringing hardware 2-2
Ring generator interface 2-2
Line module power converter 2-3
Ring multiplexer 2-3
Ring bus 2-3
LM and RLM ringing process 2-3
LM and RLM processors associated with ringing 2-4
SP and RGI interactions 2-5
Ringing takeover 2-6
Ringing take back 2-7

viii Contents
297-1001-131 Standard 06.01 October 2000
Ringing generator capacity 2-8
Ringing generator takeover and take back 2-9
LM and RLM ringing generator parameters 2-9
3 Ringing in Series II peripherals 3-1
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
SCM-100R ringing hardware 3-7
RCT ringing hardware 3-8
Ringing generator capacity 3-9
Ringing generator takeover 3-9
SCM-100S 3-9
Ringing types supported by SCM-100S 3-9
SCM-100S ringing configuration 3-9
SCM-100S ringing hardware 3-10
RCS hardware 3-11
Ringing generator takeover 3-11
LCM ringing functional description 3-11
Ringing generator capacity 3-14
Types of ringing supported 3-14
Ringing configuration 3-14
Detailed ringing schematic 3-17
Ringing signals 3-19
ANI/coin signals 3-21
Ringing process 3-22
Ringing synchronization task 3-22
Ringing generator output zero-crossing detection 3-22
Ringing schedule task 3-22
Ringing and ANI/coin messaging 3-23
Ringing sequence flowchart 3-24
Ringing generator configuration change procedure 3-26
Dual LCM configuration 3-26
Single LCM configuration 3-37
Ringing in the Universal Edge 9000 3-45
Ringing in the Remote Line Concentrating Module 3-47
Ringing in the Outside Plant Module and OPAC 3-47
Ringing in the Remote Switching Center 3-47
4 Administration of DMS ringing 4-1
Assigning ringing to line modules 4-1
Assigning ringing type to PM 4-1
Ringing generators 4-2
Ringing generator interface 4-2
Line cards 4-2
Table LMRNG 4-3

Contents ix
DMS-100 Ringing System
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
Ringing generator 4-6
Line cards 4-6
Table RCUINV 4-6
Assigning ringing to the OPM 4-6
Assigning ringing to the RSC 4-6
Assigning ringing to lines 4-6
Setting immediate ring enable 4-7
Revertive ringing 4-7
Teen ringing tables 4-7
Distinctive ringing tables 4-7
Table OFCOPT 4-7
Table CUSTSTN 4-7
Table LMRNG 4-8
Table LCMINV 4-8
5 Ringing system maintenance 5-1
Ringing user interface 5-1
Ringing generator overload control 5-1
RG overload control - Series I peripherals 5-1
RG overload control - Series II peripherals 5-2
Troubleshooting 5-2
Log reports associated with ringing 5-2
Ringing generator status 5-5
Ringing generator alarms 5-6
Replacing ring generators 5-6
Ringing maintenance and troubleshooting 5-6

DMS-100 Family DMS-100 Ringing System BASE15 and up
xi
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.
The first two digits indicate the version. The version number increases each
time the document is updated to support a new software release. For example,
the first release of a document is 01.01. In the next software release cycle, the
first release of the same document is 02.01.
The second two digits indicate the issue. The issue number increases each time
the document is revised but rereleased in the same software release cycle. For
example, the second release of a document in the same software release cycle
is 01.02.
To determine which version of this document applies to the software in your
office and how documentation for your product is organized, check the release
information in Product Documentation Directory, 297-8991-001.
This document is written for all DMS-100 Family offices. More than one
version of this document may exist. To determine whether you have the latest
version of this document and how documentation for your product is
organized,checkthe releaseinformation inProductDocumentation Directory,
297-8991-001.
References in this document
The following documents are referred to in this document:
•Product Documentation Directory, 297-8991-001
•Subscriber Carrier Module-100 Rural General Description,
297-1001-064

xii
297-1001-131 Standard 06.01 October 2000
•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
•Office Parameters Reference Manual
•Log Report Reference Manual
•Translations Guide
•Card Replacement Procedures
•Customer Data Schema Reference Manual
What precautionary messages mean
The types of precautionary messages used in NT documents include danger,
warning, and caution messages. Danger, warning, and caution messages
indicate possible risks.
Examples of the precautionary messages follow.
DANGER
Possibility of personal injury
DANGER
Risk of electrocution
Do not open the front panel of the inverter unless fuses F1,
F2, and F3 have been removed. The inverter contains
high-voltage lines. Until the fuses are removed, the
high-voltage lines are active, and you risk being
electrocuted.

xiii
DMS-100 Family DMS-100 Ringing System BASE15 and up
WARNING
Possibility of equipment damage
CAUTION
Possibility of service interruption or degradation
How commands, parameters, and responses are represented
Commands, parameters, and responses in this document conform to the
following conventions.
Input prompt (>)
An input prompt (>) indicates that the information that follows is a command:
>BSY
Commands and fixed parameters
Commands and fixed parameters that are entered at a MAP terminal are shown
in uppercase letters:
>BSY CTRL
Variables
Variables are shown in lowercase letters:
>BSY CTRL ctrl_no
The letters or numbers that the variable represents must be entered. Each
variable is explained in a list that follows the command string.
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.
CAUTION
Possible loss of service
Before continuing, confirm that you are removing the card
from the inactive unit of the peripheral module.
Subscriber service will be lost if you remove a card from
the active unit.

xiv
297-1001-131 Standard 06.01 October 2000
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:
1Manually busy the CTRL on the inactive plane by typing
>BSY CTRL ctrl_no
and pressing the Enter key.
where
ctrl_no
is the number of the CTRL (0 or 1)
Example of a MAP response :
FP 3 Busy CTRL 0: Command request has been submitted.
FP 3 Busy CTRL 0: Command passed.

DMS-100 Family DMS-100 Ringing System BASE15 and up
1-1
1 DMS-100 ringing overview
IntroductionThe 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. The cycle is
divided into 12 time slots, which are the smallest divisions of the ringing cycle.
The duration of each time slot is software controlled and is typically set to 0.5
s. In many DMS-100 peripherals, the ringing cycle is further divided into
larger divisions consisting of one or more time slots.
The DMS-100 line module equipment (LME), line concentrating equipment
(LCE), and Subscriber Carrier Module (SCM) each use a distinctive ringing
cycle format. For example, each subdivides the ringing cycle differently.
The ringing cycle in the LME is divided into 12 time slots, which are typically
set to 0.5 s each. The ringing cycle in the Line Concentrating Module (LCM),
like the LME, is also divided into 12 time slots. However, the LCM ringing
cycle is further divided into four subcycles. The subcycles consist of one or
more time slots.
The ringing cycle in the SCM, like the LME and LCM, is divided into 12 time
slots. It is further subdivided into three phases consisting of four time slots of
2 s each.
A diagram of each of the DMS-100 ringing cycle formats is shown in the
following figure.

1-2 DMS-100 ringing overview
297-1001-131 Standard 06.01 October 2000
Figure 1-1 Illustration of a DMS-100 ringing cycle
Note: The time slot duration for LCE ringing varies with the ringing
scheme. If ringing is superimposed or coded, all time slot durations are 500
ms. If frequency selective ringing (FSR) is used, time slot 0 is 60 ms, time
slot 1 is 65 ms, time slot 2 is 75 ms, and the remainder of the time slots are
45 ms each. The total duration for the ringing cycle remains 6 s.
Operating company personnel can define the time slot and subcycle durations
according to the type of ringing scheme being used.
Normal and immediate ringing
The DMS-100 switch applies power ringing to a line in either normal or
immediate ringing mode. In the normal ringing mode, the DMS-100 switch
LME ringing cycle
Ringing cycle
(6 s)
Time slot
(500 milliseconds[ms])
012 34 5 6 7 891011
012 3456 7 891011
012 3456 7 891011
Ringing cycle
(6 s)
Time slot
(500 ms)
Subcycle
0123
Subcycle Subcycle Subcycle
Ringing cycle
(6 s)
Time slot
(500 ms)
Phase 1 Phase 2 Phase 3
LCE ringing cycle
SCM ringing cycle

DMS-100 ringing overview 1-3
DMS-100 Family DMS-100 Ringing System BASE15 and up
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. This can cause delays in power ringing of up to 6 s
in LCMs and up to 8 s in line modules (LM). To reduce these delays, an
immediate ringing mode is available.
In the immediate ringing mode, the DMS-100 switch applies power ringing
during the next available time slot of the ringing portion of the ringing cycle.
If power ringing cannot be applied during the first time slot of the ringing
portion of a ringing cycle, the DMS-100 switch will try to schedule power
ringing during the next time slot of the ringing portion of the same ringing
cycle. The DMS-100 switch attempts to schedule power ringing during each
time slot of the ringing portion of a ringing cycle until power ringing can be
applied, or the ringing portion of the ringing cycle expires. If power ringing
can not be applied during this ringing cycle, the DMS-100 will try the next
ringing cycle.
Immediate ringing is enabled or disabled by office parameter
IMMEDIATE_RING_ENABLE in table OFCENG.
Note: When changing the office parameter
IMMEDIATE_RING_ENABLE intableOFCENGtoY,consideration must
be given to the value datafilled for office parameter
ALLOW_RINGING_ON_TIP_SIDE. When this office parameter is set to
Y, a considerable amount of ring slots are reserved for tip side ringing
functionality. This may delay the next available time slot in the ringing
portion of the ring cycle. For more information on office parameter
ALLOW_RINGING_ON_TIP_SIDE, refer to Office Parameters Reference
Manual.
An illustration of normal and immediate ringing for a 1FR (1 flat rate is a
standard line option) is shown in the following figure. This illustration is not
specific to any ringing type. It illustrates the differences in normal and
immediate ringing on a 1FR line when time slot 0 of the ringing cycle is
unavailable.

1-4 DMS-100 ringing overview
297-1001-131 Standard 06.01 October 2000
Figure 1-2 Normal versus immediate ringing on 1FR line
The effects of immediate ringing on the power ringing signal differ between
LME and LCE. In LME, when immediate ringing is enabled, the DMS-100
schedules power ringing during the next available time slot in the ringing
portion of the ringing cycle. Ringing is removed at the end of the last time slot
in the ringing portion of the ringing cycle.
For example, in Figure 1-2, "Normal versus immediate ringing on 1FR
line." immediate ringing is enabled on the LME, the first power ringing burst
applies at the start of time slot 1 and continues to the end of time slot 3. This
results in a ringing burst truncated to 1.5 s rather than a complete 2-s burst.
In LCE, like LME, when immediate ringing is enabled, the DMS-100
schedules power ringing during the next available time slot in the ringing
portion of the ringing cycle. Ringing is removed when the 2-s burst has
completed.
Ringing request received
Apply power ringing
Ringing cycle 1 Ringing cycle 2
Ringing
applied
Ringing
applied
Time slot 0 not available.
Try cycle 2. Time slot 0 available. Apply
power ringing at Time slot 0.
Normal
ringing
(immediate
ringing
disabled) 6-s delay
Time slot 0 not available. Try time slot 1. Time slot 1
available. Apply power ringing at slot 1.
Immediate
ringing
enabled
Apply power ringing
0.5-s delay
01 2 3 4 5 7 86 9 1011 0 1 2 3 4 5 7 86 9 1011
12345 786 9 10 11 0 1 2 3 4 5 7 86 9 10110
12345 786 9 10 11 0 1 2 3 4 5 7 86 9 10110