Nortel Communication Server 1000 User manual

Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571
.

Document status: Standard
Document version: 02.01
Document date: 7 December 2007
Copyright © 2007, Nortel Networks
All Rights Reserved.
Sourced in Canada
While the information in this document is believed to be accurate and reliable, except as otherwise expressly agreed
to in writing NORTEL PROVIDES THIS DOCUMENT "AS IS" WITHOUT WARRANTY OR CONDITION OF ANY
KIND, EITHER EXPRESS OR IMPLIED. The information and/or products described in this document are subject
to change without notice.
Nortel, the Nortel Logo, the Globemark, SL-1, Meridian 1, and Succession are trademarks of Nortel Networks.
All other trademarks are the property of their respective owners.

3
Contents
New in this Release 7
Features 7
Other changes 7
Revision history 7
How to get help 9
Getting help from the Nortel Web site 9
Getting help over the telephone from a Nortel Solutions Center 9
Getting help from a specialist by using an Express Routing Code 9
Getting help through a Nortel distributor or reseller 10
Introduction 11
Subject 11
Applicable systems 11
Intended audience 12
Related information 12
Overview 15
Contents 15
Introduction 15
Application principles 17
Channels 19
Interworking with other signaling systems 21
Numbering plans for DASS2 routes 22
Hardware requirements 33
Contents 33
DASS2 hardware requirements 33
Basic configuration 39
Contents 39
Introduction 39
Configuring basic capabilities 42
Configuring call charging information 51
Configuring Calling Line Identity 51
Attendant Through Dialing Networkwide 53
Contents 53
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

4Contents
Introduction 53
Operating parameters 55
Feature interactions 56
Feature packaging 57
Feature implementation 58
Feature operation 59
DASS2/DPNSS1 INIT Call Cut Off 61
Contents 61
Introduction 61
Operating parameters 62
Feature interactions 62
Feature packaging 62
Feature implementation 62
Feature operation 63
Virtual Network Services in the UK with DASS2/DPNSS1
Bearers 65
Contents 65
Feature description 65
Operating parameters 65
Feature interactions 66
Feature packaging 69
Feature implementation 70
Feature operation 73
Integrated Digital Access (IDA) equipment 75
Contents 75
DASS2 hardware requirements 75
NT5K35, NT5K75 and NT6D11AE DCHI cards 81
NT8D72 PRI 83
NT5D97AD Dual-port DTI2/PRI2 card 85
Hardware required for DDP2 configuration 108
Clock Controller 109
Schematics 111
Cabling requirements 113
DCHI installation and removal 119
Contents 119
Setting up the NT5K35 119
Setting up the NT5K75 123
Setting up the NT6D11AE/AF 128
Installing the DCHI 134
Removing the DCHI 135
Setting up the NTAG54AA 135
NTAG54 installation and removal 135
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

Contents 5
PRI installation and removal 139
Contents 139
Non DPRI 139
NT5D97AD Dual-port DTI2/PRI2 installation and removal 144
Clock Controller installation and removal 157
Contents 157
Setting up the QPC775 157
QPC441 3PE card switch settings 159
Installing or replacing the QPC775 or NTRB53 on
Half Group and Single Group Systems 160
Installing or replacing the QPC775 or NTRB53 on Multi Group System 161
IDA status check and start-up 167
Contents 167
Description 167
IDA status check 168
IDA start-up 169
IDA trunk maintenance commands and messages 170
Clock synchronization 172
Clock Controller maintenance commands 172
Resident fault monitoring 173
Diagnostic error messages 175
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

6Contents
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

7
New in this Release
The following sections detail what’s new in DASS2 (NN43001-571) for
release 5.5.
•"Features" (page 7)
•"Other changes" (page 7)
Features This release contains no new features.
Other changes
See the following sections for information about changes that are not
feature-related:
Revision history
December 7, 2007 Standard 02.01. This document is up-issued to
support Communication Server 1000 Release
5.5.
June 2007 Standard 01.02. This document is up-issued
to remove the Nortel Networks Confidential
statement, and for changes in technical content,
including . the section Configuring Calling Line
Identity.
May 30, 2007 Standard 01.01. This document is issued to
support Communication Server 1000 Release 5.0
This document contains information previously
contained in the following legacy document, now
retired: DASS2 (553-3001-371). No new content
has been added for Communication Server 1000
Release 5.0. All references to Communication
Server 1000 Release 4.5 are applicable to
Communication Server 1000 Release 5.0.
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

8New in this Release
July 2006 Standard 4.00. This document is up-issued
for changes in technical content, including
descriptions and range values for new overload
protection counters.
August 2005 Standard 3.00. This document is up-issued for
Communication Server 1000 Release 4.5.
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.
This new document consolidates information
previously contained in the following legacy
documents, now retired:
•DASS2 Product Overview Guide
(553-3911-100)
•DASS2 Installation Guide (553-3911-200)
•DASS2 Features and Services Guide
(553-3911-300)
•DASS2 Maintenance Guide (553-3911-500)
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

9
How to get help
This chapter explains how to get help for Nortel products and services.
Getting help from the Nortel Web site
The best way to get technical support for Nortel products is from the Nortel
Technical Support Web site: www.nortel.com/support
This site provides quick access to software, documentation, bulletins, and
tools to address issues with Nortel products. From this site, you can:
•download software, documentation, and product bulletins
•search the Technical Support Web site and the Nortel Knowledge Base
for answers to technical issues
•sign up for automatic notification of new software and documentation
for Nortel equipment
•open and manage technical support cases
Getting help over the telephone from a Nortel Solutions Center
If you do not find the information you require on the Nortel Technical Support
Web site, and you have a Nortel support contract, you can also get help
over the telephone from a Nortel Solutions Center.
In North America, call 1-800-4NORTEL (1-800-466-7835).
Outside North America, go to the following Web site to obtain the telephone
number for your region:
www.nortel.com/callus
Getting help from a specialist by using an Express Routing Code
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

10 How to get help
To access some Nortel Technical Solutions Centers, you can use an Express
Routing Code (ERC) to quickly route your call to a specialist in your Nortel
product or service. To locate the ERC for your product or service, go to:
www.nortel.com/erc
Getting help through a Nortel distributor or reseller
If you purchased a service contract for your Nortel product from a distributor
or authorized reseller, contact the technical support staff for that distributor
or reseller.
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

11
Introduction
This document is a global document. Contact your system supplier or your
Nortel representative to verify that the hardware and software described
are supported in your area.
Subject The DASS2 document provides:
•information on DASS2 components and functionality, including features,
application protocols, hardware components and schematics, hardware
and software requirements
•procedures to install and administer features through overlay programs,
and to maintain DASS2 links
•lists of applicable system error messages
Note on legacy products and releases
This NTP contains information about systems, components, and features
that are compatible with Nortel Communication Server 1000 Release 5.5
software. For more information on legacy products and releases, click the
Technical Documentation link under Support & Training on the Nortel
home page:
www.nortel.com
Applicable systems
This document applies to the following systems:
•Communication Server 1000E (CS 1000E) CP PII, CP PIV and CP PM.
•Communication Server 1000M Single Group (CS 1000M SG) CP PII,
CP PIV
•Communication Server 1000M Multi Group (CS 1000M MG) CP PII,
CP PIV
Note: When upgrading software, memory upgrades may be required on
the Signaling Server, the Call Server, or both.
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

12 Introduction
System migration
When particular Meridian 1 systems are upgraded to run CS 1000 5.5
software and configured to include a Signaling Server, they become CS
1000M systems. Table 1 "Meridian 1 systems to CS 1000M systems" (page
12) lists each Meridian 1 system that supports an upgrade path to a CS
1000M system.
Table 1
Meridian 1 systems to CS 1000M systems
This Meridian 1 system... Maps to this CS 1000M system
Meridian 1 PBX 11C Chassis CS 1000E
Meridian 1 PBX 11C Cabinet CS 1000E
Meridian 1 PBX 61C CS 1000M Single Group
Meridian 1 PBX 81C CS 1000M Multi Group
For more information, see one or more of the following NTPs:
•Communication Server 1000M and Meridian 1: Small System Upgrade
Procedures (NN43011-459)
•Communication Server 1000M and Meridian 1: Large System Upgrade
Procedures (NN43021-458)
•Communication Server 1000S: Upgrade Procedures (NN43031-458)
•Communication Server 1000E: Upgrade Procedures (NN43041-458)
Intended audience
The intended audience of this document is as follows.
•network data managers, design personnel, marketing personnel, and
anyone requiring information about DASS2
•network data administrators and technicians responsible for DASS2
connections
•individuals responsible to install DASS2 networks
•technical staff responsible to maintain DASS2 networks
Related information
This section lists information sources that relate to this document.
NTPs
The following NTPs are referenced in this document:
•Features and Services (NN43001-106)
•Software Input/Output: Administration (NN43001-611)
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

Related information 13
•Software Input/Output: Maintenance (NN43001-711) )
Online
To access Nortel documentation online, click the Technical Documentation
link under Support & Training on the Nortel home page:
www.nortel.com
CD-ROM
To obtain Nortel documentation on CD-ROM, contact your Nortel customer
representative.
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

14 Introduction
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

15
Overview
Contents This section contains information on the following topics:
"Feature implementation" (page 70)
"Application principles" (page 17)
"Channels" (page 19)
"Interworking with other signaling systems" (page 21)
"Numbering plans for DASS2 routes" (page 22)
IntroductionBritish Telecom’s Digital Access Signaling System No.2 (DASS2) is the
signaling protocol defined for PBX access to the Integrated Services Digital
Network (ISDN). In the United Kingdom, DASS2 provides:
•digital access to (U.K.) ISDN for voice and data calls
•supplementary facilities, such as Call Charge Indication and Calling
Line Identity
•TIE line user-to-user signaling facility, allowing semi-permanent private
networking connections to be established between PBXs, via ISDN
Note: DASS2 is supported only in the Media Gateway 1000S (MG
1000S) and the Option 11C. It is not supported in the MG 1000S
Expansion or Option 11C Expander.
DASS2 is the standard UK protocol for 2Mbit/s connections between PBXs
and British Telecom’s ISDN. In keeping with the product development
philosophy of Nortel, full interworking is provided between DASS2 and the
following signaling interfaces:
•Q.931 MCDN interface
•Q.931 public ISDN access interface
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

16 Overview
•DPNSS1 private networking interface
DASS2 is specified in terms of the International Standards Organization
(ISO) reference model for Open Systems Interconnection (OSI). Level
1 (Physical) of the model is a 2.048 Mbit/s digital interface and level 2
(Data Link) is the Link Access Protocol (LAP) defined for DASS2. Level 3
(Network) is the message layer unique to DASS2. Figure 1 "How the OSI
Model works" (page 16) illustrates the OSI model.
Figure 1
How the OSI Model works
Each layer in the model depends on the services offered by the layer
below it and, in turn, builds on those services to perform a specific set of
communication functions. Protocols are the mechanism by which each layer
accomplishes its communication functions. It then offers these functions
to the layer above it in the form of its own set of services. Note that,
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

Application principles 17
while services are used between layers within a signaling entity (switch),
protocols operate within the same layer of the OSI model but between
different signaling entities.
The OSI layering approach effectively divides the complex task of
communication between network signaling entities into a series of more
easily manageable pieces, each of which can be modified without affecting
the other pieces. This allows more flexible evolution and compatibility with
the ongoing standards activities.
Figure 2 "The structure of the OSI Model together with the functions of
each layer" (page 17) shows the structure of the OSI Model and describes
the functions of each layer.
Figure 2
The structure of the OSI Model together with the functions of each layer
Application principles
Transmission system
The 2.048 Mbit/s digital transmission is divided into 32 timeslots, numbered
0-31. Timeslots 1-15 and 17-31 provide 30 traffic channels. Timeslot 0 is
used as a synchronization channel. DASS2 is a message-based signaling
system that uses a common signaling channel in timeslot 16. Each traffic
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

18 Overview
channel has an associated LAP. The LAPs operate in parallel over the
signaling channel. Various messages are defined; each message has
mandatory data elements and may include additional optional information.
Note: British Telecom (BT) numbers the traffic channels 1-30 (that is,
timeslot 17 and LAP 17 are associated with traffic channel 16), but in
the implementation the timeslot numbers are used to number the traffic
channels.
Each traffic channel, together with its LAP, represents one trunk and can
be used for a call independently of the other channels for an incoming or
outgoing call.
Each 2.048 Mbit/s link must be connected to an ISDN local public exchange.
Some channels on the link may be configured to support the TIE Line
Signaling facility, which allows a DPNSS1 connection to be established
between PBXs through the public ISDN.
Link designation
The ends of each inter-PBX link are labelled arbitrarily A and B, and the
ends of each DASS2 channel are designated X and Y. The X end has
priority if both ends attempt to use the channel at the same time.
PBX functions
A PBX that connects a DASS2 channel to or from a non-DASS2 device is
termed an end PBX. If that device is a trunk, then the PBX is termed a
gateway. A PBX connecting two DASS2 channels is a transit.
Configuration of trunks
DASS2 trunks are configured using the same route and member method
used for other trunks, thus:
•Any number of routes may be associated with the same link.
•A route may be associated with any number of links.
•Each route member must be assigned to one channel.
•Not all channels need to be associated with members. These
non-associated channels cannot, however, be used for calls.
•Members and channels must be numbered separately.
•Members are screened for outgoing calls using a linear search
(Sequential Line) or round robin (Cyclic Line). For DASS2 links, a linear
search should be used.
•Each route may be configured only for incoming calls, only for outgoing
calls, or for both.
•Each route must be configured with DASS2 channels only.
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

Channels 19
Figure 3 "A typical DASS2 system configuration" (page 19) shows a
typical DASS2 system configuration with a Q.931-to-DASS2 gateway, a
DPNSS1-to-DASS2 gateway, and the major public exchange types to which
DASS2 connectivity is supported.
Figure 3
A typical DASS2 system configuration
Channels Within the DASS2 intelligent networking environment, a channel is a circuit
that carries information between two PBXs via digital links. There are two
types of channels — Bearer channels (B-channels) and Data channels
(D-channels). The Bearer Channel (B-channel) is a digital trunk route
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.

20 Overview
carrying data/voice information — call processing signaling information is
not carried over a B-channel. Voice and data transmission over DASS2
links is done at a rate of 64 Kbit/s. There may be up to 30 B-channels per
D-channel.
The Data Channel (D-channel) carries call processing information between
PBXs for the associated B-channels (call set-up and tear-down information,
network feature activation information). The format is a High Level Data
Link Control frame. For DASS2 applications, the D-channel must be a 64
Kbit/s digital channel. It may exist on the same or different carrying medium
as the B-channels that it supports. One D-channel may support up to 30
B-channels.
Refer to Figure 4 "Channel configurations for DASS2" (page 20) for a
depiction of how channels are typically configured for a DASS2 system.
Figure 4
Channel configurations for DASS2
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Copyright © 2007, Nortel Networks
.