Nortel Networks NN43001-301 User Manual

Nortel Communication Server 1000

ISDN Primary Rate Interface Installation and Commissioning

NN43001-301

Document status: Standard Document version: 02.03 Document date: 7 December 2007

Sourced in Canada LEGAL NOTICE 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.

New in this release 9

Other 9

How to get help 11

Getting help from the Nortel web site 11 Getting help over the telephone from a Nortel Solutions Center 11 Getting help from a specialist by using an Express Routing Code 11 Getting help through a Nortel distributor or reseller 12

Introduction 13

Subject 13 Applicable systems 13 Intended audience 14 Related information 14

ISDN Primary Rate Interface equipment overview 15

Contents 15 Introduction 17 Primary Rate Interface (PRI) hardware requirements 17 ISDN Signaling Link (ISL) hardware 18 D-Channel Handler description 20 NT6D11 DCH 20 QPC757 DCH 21 NT6D80 MSDL 23 NTBK51 Downloadable D-Channel Daughterboard 25 Standard PRI cards 25 NT8D72 PRI2 25 QPC720 PRI 30 Disk drive hardware 34 NT5D97 Dual-port DTI2/PRI2 card 34 NT5D12 Dual-port DTI/PRI 57

Revision History 9

DCH installation 79

Contents 79 Install the NT6D11AB, NT6D11AE, NT6D11AF DCH 79 Set up the NT6D11AB, NT6D11AE, NT6D11AF DCHI 80

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4 Contents

Install the NT6D11AB, NT6D11AE, NT6D11AF DCHI 85 Remove the NT6D11AB, NT6D11AE, NT6D11AF DCH 86 Install the QPC757 DCH 87

NTBK51 DDCH installation and removal 91

Contents 91 Introduction 91 Install NTBK51 DDCH on NT5D97 dual-port DTI2/PRI2 card 91 Remove NTBK51 DDCH from NT5D97 dual-port DTI2/PRI2 card 92 Install NTBK51 DDCH on NT5D12 dual-port DTI/PRI 93 Remove NTBK51 DDCH from NT5D12 dual-port DTI/PRI 94

MSDL installation for all systems 95

Contents 95 Install the MSDL 95 Replace the MSDL 98

NT8D72 and QPC720 PRI card installation 101

Contents 101 Introduction 101 PRI circuit pack locations 101 Cable requirements 102 Switch settings 120 Install NT8D72 and QPC720 PRI cards on Large Systems 123 Remove NT8D72 and QPC720 PRI cards from Large Systems 124 Install an additional network shelf 125

NT5D97 Dual-port DTI2/PRI2 installation and removal 127

Contents 127 Introduction 127 NT5D97 circuit card locations 127 Port deﬁnitions 128 Case Scenarios for replacing a digital trunk NT8D72BA, QPC536E, or NTCK43

by a DDP2 card 128 NT5D97AA/AB DIP switch settings 129 NT5D97AD DIP switch settings 134 Install the NT5D97 DDP2 139 Remove the NT5D97 DDP2 140 Conﬁgure the NT5D97 DDP2 141

NT5D12 Dual-port DTI/PRI card installation 143

Contents 143 Introduction 143 NT5D12 circuit card locations 143 Port deﬁnitions 144 Scenarios for replacement of a digital trunk card (QPC720/QPC472) by a DDP

card 144

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Contents 5

NT5D12 switch settings 145 Install the NT5D12 DDP 150 Remove the NT5D12 DDP 152 Conﬁgure the NT5D12 DDP 153

Clock Controller description and installation 155

Contents 155 Introduction 156 Description 156 Installation procedures 168

ISL installation 179

Contents 179 ISL conﬁgurations 179 DCHI switch settings 180 MSDL switch settings 181 Dedicated mode using leased line 183 Dedicated mode using dialup modem 184 ISL installation 189

Echo canceller installation 191

Contents 191 Introduction 191 Echo canceller operating parameters 191 Echo canceller initialization procedures 191 PRI to Echo canceller pin assignments 192 Electromagnetic Interference 192

1.5 Mb PRI implementation 195

Contents 195 Overview 195 Hardware requirements 195 Hardware description 196 Install PRI hardware 203

1.5 Mb DTI implementation 219

Contents 219 Overview 219 Hardware requirements 219 Hardware description 220 Install DTI hardware 220 Software enable the DTI/PRI cards 222

1.5 Mb ISL implementation 227

Contents 227 Overview 227 Hardware requirements 227 Basic ISL implementation 232

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2.0 Mb DTI implementation 237

Contents 237 Overview 237 Hardware requirements 237 NTAK10 2.0 Mb DTI card 238 Install DTI hardware 238 DTI software implementation 241

2.0 Mb PRI implementation 257

Contents 257 Overview 257 Hardware requirements 257 Hardware description 258 Install the NTAK79 PRI card 261 Install the NTBK50 PRI card 266 PRI software implementation 272

2.0 Mb ISL implementation 283

Contents 283 Overview 283 ISL hardware requirements 283 ISL hardware installation 286 ISL software implementation 288

Nonstandard cables 295

Contents 295 Introduction 296 NT5K40AA, NT5K41AA, NT5K86AA 296 NT8D7206, NT8D7207 296 QCAD128 297 QCAD129 298 QCAD133 298 NT8D7205 299 QCAD328 300 NT8D74 Clock Controller to InterGroup cable 301 NT8D75 Clock Controller to Clock Controller cable 301 NT8D79 PRI/DTI to Clock Controller cable 301 NT8D83 PRI/DTI to I/O cable 301 NT8D85 Network to IPE cable 302 NT8D86 Network to I/O cable 302 NT8D97AX PRI/DTI I/O to MDF cable 302 NT9J93AD PRI/DTI Echo Canceller to I/O cable 303 NTND26 PRI to MSDL cables 303 NTND27 MSDL to I/O panel cables 303 NTND98 PRI to I/O panel cables 303

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Contents 7

Procedures

Procedure 1 Install the NT6D11AB, NT6D11AE, NT6D11AF DCH 85 Procedure 2 Remove the NT6D11AB, NT6D11AE, NT6D11AF DCH 86 Procedure 3 Install the QPC757 DCHI 87 Procedure 4 Remove the QPC757 DCH 90 Procedure 5 Install the NTBK51 on the NT5D97 dual-port DTI2/PRI2

card 92

Procedure 6 Remove the NTBK51 from the NT5D97 dual-port DTI2/PRI2

card 93

Procedure 7 Install the NTBK51 DDCH on the NT5D12 dual-port

DTI/PRI 94

Procedure 8 Remove the NTBK51 from the NT5D12 dual-port DTI/PRI

card 94 Procedure 9 Install the MSDL card 95 Procedure 10 Replace the MSDL card 98 Procedure 11 Install the NT8D72 and QPC720 PRI on Large Systems 123 Procedure 12 Procedure 13 Install an additional network shelf on Half Group and Single

Procedure 14 Install the NT5D97 on Large Systems 139 Procedure 15 Remove the NT5D97 from Large Systems 141 Procedure 16 Install the NT5D12 on Large Systems 151 Procedure 17 Remove the NT5D12 DDP 152 Procedure 18 Install a clock controller for Half Group and Single Group

Procedure 19 Install a Clock Controller on a Single Group and Multi Group Procedure 20 Remove old equipment 175

Procedure 21 Installing new equipment 176 Procedure 22 Install ISL in dedicated mode 189 Procedure 23 Install ISL in shared mode 189 Procedure 24 Mounting the NTAK20 daughterboard on the NTRB21 203 Procedure 25 Inserting the NTRB21 TMDI card 205 Procedure 26 Removing the NTRB21 TMDI card 206 Procedure 27 Mounting the daughterboards on the NTAK09 206 Procedure 28 Removing the daughterboards from the NTAK09 207 Procedure 29 Installing the NTAK09 209 Procedure 30 Connecting the cables 209 Procedure 31 Enabling the NTRB21 TMDI card 210 Procedure 32 Enabling the NTAK09 DTI/PRI card 211 Procedure 33 Implementing basic PRI 212 Procedure 34 Enabling the NTRB21 TMDI card 222 Procedure 35 Enabling the NTAK09 card 222 Procedure 36 Implementing DTI 223 Procedure 37 Installing ISL hardware 230 Procedure 38 Implementing dedicated mode 232 Procedure 39 Connecting the cables 240 Procedure Procedure 40 Connecting the cables 264

124

Group systems 125

Systems. 171

System 173

261

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Procedure

266 Procedure 41 Inspecting the NTBK50 circuit card 266 Procedure 42 Installing the NTAK02 286 Procedure 43 Setting up the D-channel 287

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New in this release

There have been no updates to the document in this release

Other

Revision History

December 2007

August 2007

June 2007 Standard 01.02. This document is up-issued to remove the Nortel

May 2007

August 2005

September 2004

October 2003

Standard 02.03. This document has been up-issued to support Communication Server Release 5.5.

Standard 01.03. This document has been up-issued to support a change request.

Networks Confidential statement. 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: ISDN Primary Rate Interface Installation and Commissioning (NN43001-301). 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.

Standard 3.00. This document is up-issued to support Communication Server 1000 Release 4.5.

Standard 2.00. This document is up-issued for Communication Server 1000 Release 4.0.

Standard 1.00. This document is a new technical document for Succession 3.0. It was created to support a restructuring of the Documentation Library, which resulted in the merging of multiple legacy technical documents. This new document consolidates information previously contained in the following legacy documents, now retired:

ISDN Primary Rate Interface Installation and Commissioning

•

ISDN Primary Rate Interface: Installation (553-2901-201)

•

1.5Mb DTI/PRI: Description, Installation and Maintenance (553-3011-310) (Content from 1.5Mb DTI/PRI: Description, Installation and Maintenance (553-3011-310) also appears in ISDN Primary Rate Interface Maintenance (NN43001-717).)

Nortel Communication Server 1000

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10 New in this release

•

2.0Mb DTI/PRI: Description, Installation and Maintenance (553-3011-315) (Content from 2.0Mb DTI/PRI: Description, Installation and Maintenance (553-3011-315) also appears in ISDN Primary Rate Interface Maintenance (NN43001-717).)

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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:

ttp://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

•

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 TechnicalSupport 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:

ttp://www.nortel.com/callus

Getting help from a specialist by using an Express Routing Code

Toaccess 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:

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12 How to get help

http://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.

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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

Note on legacy products and releases

This technical document 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 Training on the Nortel home page:

ww.nortel.com

Applicable systems

This document applies to the following systems:

Technical Documentation link under Support &

•

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

•

Meridian 1 PBX 11C Chassis

•

Meridian 1 PBX 11C Cabinet

•

Meridian 1 PBX 61C CP PII, CP PIV

•

Meridian 1 PBX 81C CP PII, CP PIV Note: When upgrading software, memory upgrades may be required on

the Signaling Server, the Call Server, or both.

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14 Introduction

System migration

When particular Meridian 1 systems are upgraded to run CS 1000 software and conﬁgured to include a Signaling Server, they become CS 1000 systems. Table 1 "Meridian 1 systems to CS 1000 systems" (page 14) lists each Meridian 1 system that supports an upgrade path to a CS 1000 system.

Table 1 Meridian 1 systems to CS 1000 systems

This Meridian 1 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

Intended audience

This document is intended for individuals responsible for installing and conﬁguring ISDN PRI.

Related information

This section lists information sources that relate to this document.

Technical Documents

The following technical documents are referenced in this document:

•

Features and Services Fundamentals (NN43001-106)

•

Software Input Output Administration (NN43001-611)

•

Software Input Output Reference — Maintenance (NN43001-711)

Maps to this CS 1000 system

Online

To access Nortel documentation online, click the Technical Documentation link under Support & Training on the Nortel home page:

ww.nortel.com

CD-ROM

To obtain Nortel documentation on CD-ROM, contact your Nortel customer representative.

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ISDN Primary Rate Interface equipment overview

The section contains information on the following topics:

"Introduction" (page 17) "Primary Rate Interface (PRI) hardware requirements" (page 17) "ISDN Signaling Link (ISL) hardware" (page 18)

"64 Kbit/s Clear Data Hardware" (page 20) "D-Channel Handler description" (page 20) "NT6D11 DCH" (page 20)

"Power requirements" (page 20)

"DCH/PRI interface" (page 20)

"DCH faceplate" (page 20)

"QPC757 DCH" (page 21)

"Power requirements" (page 21)

"DCH/PRI interface" (page 21)

"QPC757 faceplate" (page 22) "NT6D80 MSDL" (page 23)

"Power requirements" (page 23)

"MSDL/PRI interface" (page 24)

"MSDL faceplate" (page 24) "NTBK51 Downloadable D-Channel Daughterboard" (page 25) "Standard PRI cards" (page 25) "NT8D72 PRI2" (page 25)

"Power requirements" (page 25)

"NT8D72 faceplate" (page 25)

"Cable requirements" (page 27)

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16 ISDN Primary Rate Interface equipment overview

"Carrier interface" (page 27)

"Echo canceller interface" (page 28)

"QMT21 High Speed Data Module" (page 28)

"QPC720 PRI for 1.5/2.0 Mb gateway" (page 28)

"Clock operation for the NT8D72" (page 28) "QPC720 PRI" (page 30)

"Power requirements" (page 30)

"QPC720 faceplate" (page 31)

"QPC720 Cable requirements" (page 32)

"Carrier interface" (page 32)

"Echo Canceller interface" (page 32)

"64 T-link version 2 protocol" (page 33) "Disk drive hardware" (page 34) "NT5D97 Dual-port DTI2/PRI2 card" (page 34)

"External D-Channel Interface DCH or MSDL" (page 34)

"NT5D97 faceplate" (page 35)

"System capacity and performance" (page 39)

"Testability and diagnostics" (page 40)

"Cable requirements" (page 40)

"Cable diagrams" (page 47)

"Clock for the NT5D97" (page 49) "NT5D12 Dual-port DTI/PRI" (page 57)

"D-Channel and MSDL interface" (page 58)

"NT5D12 faceplate" (page 59)

"System capacity and performance" (page 64)

"Power requirements" (page 65)

"Testability and diagnostics" (page 65)

"NT5D12 Cable requirements" (page 65)

"Trunk Tip/Ring cables" (page 66)

"Reference clock cables" (page 68)

"MSDL/DCHI cables" (page 68)

"Cable diagrams" (page 69)

"Clock" (page 70)

"Reference clock errors" (page 71)

"Automatic clock recovery" (page 72)

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Primary Rate Interface (PRI) hardware requirements 17

"Automatic clock switching" (page 72)

"Clock configurations" (page 72)

Introduction

This chapter describes the basic hardware needed to equip ISDN PRI on CS 1000 and Meridian 1 systems.

Primary Rate Interface (PRI) hardware requirements

The following hardware is required to equip ISDN PRI on a Large System:

•

NT6D11(AB/AE/AF) D-Channel Interface (DCH) card (for 2.0 Mb PRI)

•

QPC757 D-channel Interface (DCH) for (1.5 Mb PRI)

•

NT6D80 Multipurpose Serial Data Link (MSDL) card

•

NTBK51 Downloadable D-Channel Daughterboard (DDCH), the NT5D97 dual-port DTI2/PRI2 card, or the NT5D12 dual-port 1.5 Mb DTI/PRI card

•

NT8D72 (AB/BA) PRI2 card

• NT5D97 dual-port DTI2/PRI2 card

•

QPC720 1.5 Mb PRI card

•

NT5D12 dual-port 1.5 DTI/PRI card

•

QPC775 or NTRB53 Clock Controller Note: The NTRB53 Clock Controller cannot be combined with a

QPC775 or a QPC471 card in one system

Additional hardware is also required for PRI capability and applications. Installation instructions are given in other Nortel publications, or supplied by the manufacturer. This additional hardware includes:

•

QPC414 Network card

•

Channel Service Unit (CSU)

•

Echo canceller

•

ROM circuit card requirements: — the QPC939A for a CS 1000M HG — the QPC939A for CS 1000M SG

Note: CS 1000M MG ROM requirements are fulﬁlled by the NT6D66 Call Processor (CP) card.

•

QMT8 Asynchronous Data Module (ADM)

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18 ISDN Primary Rate Interface equipment overview

See Figure 1 "PRI hardware (shown without downloadable PRI and DCH

cards)" (page 18) for a representation of the basic PRI system hardware.

Note: Figure 1 shows a basic conﬁguration, not the dual-port NT5D12 DTI/PRI card, nor the associated dual-port NTBK51AA Downloadable D-Channel daughterboard.

Figure 1 PRI hardware (shown without downloadable PRI and DCH cards)

ISDN Signaling Link (ISL) hardware

The following hardware is required for ISDN Signaling Link (ISL) capability and applications.

Equipment required for shared mode capability:

• NT6D11(AB/AE/AF) D-Channel (DCH) card (for 2.0 Mb PRI)

•

QPC757 D-channel (DCH) for (1.5 Mb PRI)

•

NT6D80 Multipurpose Serial Data Link (MSDL) card

• NTBK51 Downloadable D-Channel Daughterboard (DDCH), the NT5D97 dual-port DTI2/PRI2 card, or the NT5D12 dual-port 1.5 Mb DTI/PRI card

•

NT8D72 (AB/BA) PRI2 card

•

NT5D97 dual-port DTI2/PRI2 card

•

QPC720 1.5 Mb PRI card

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ISDN Signaling Link (ISL) hardware 19

•

NT5D12 dual-port 1.5 DTI/PRI card

•

QPC775 Clock Controller or NTRB53

Equipment required for dedicated mode using leased lines:

• NT6D11(AB/AE/AF) D-Channel (DCH) card (for 2.0 Mb PRI)

•

QPC757 D-channel (DCH) for (1.5 Mb PRI)

•

NT6D80 Multipurpose Serial Data Link (MSDL) card

• NTBK51 Downloadable D-Channel Daughterboard (DDCH), used as an option to the NT6D80 MSDL

•

modem set in synchronous mode

Equipment required for dedicated mode using a dialup modem:

•

NT6D11(AB/AE/AF) D-Channel (DCH) card (for 2.0 Mb PRI)

•

QPC757 D-channel (DCH) for (1.5 Mb PRI)

•

NT6D80 Multipurpose Serial Data Link (MSDL) card

•

NTBK51 Downloadable D-Channel Daughterboard (DDCH), used as an option to the NT6D80 MSDL

•

modem with autodial capability Note: This conﬁguration is the least reliable due to lockup problems

inherent in Smart Modems from power spikes and noisy lines. To increase the reliability on this conﬁguration, use a constant power source when powering the modems. Also, verify that TIE lines meet data grade speciﬁcations. Nortel takes no responsibility for ISL D-Channel outages due to modem lockup.

•

500 set line card

•

QPC71 2W TIE, or QPC237 4W TIE E&M

Equipment required for dedicated mode using a DTI/DTI2 trunk:

•

NT6D11(AB/AE/AF) D-Channel (DCH) card (for 2.0 Mb PRI)

•

QPC757 D-channel (DCH) for (1.5 Mb PRI)

•

NT6D80 Multipurpose Serial Data Link (MSDL) card

•

NTBK51 Downloadable D-Channel Daughterboard (DDCH), used as an option to the NT6D80 MSDL

•

NT5D97 dual-port DTI2/PRI2 card

• QPC472 1.5 Mb DTI card or NT5D12 dual-port 1.5 DTI/PRI card

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20 ISDN Primary Rate Interface equipment overview

•

QMT8 Asynchronous Data Module (ADM), QMT11 Asynchronous/Synchronous Interface Module (ASIM) or QMT21 High Speed Data Module (HSDM)

•

Data line card

64 Kbit/s Clear Data Hardware

The QMT21 High Speed Data Module (HSDM) is required in the clear-data pathway to support the 64Kbit/s clear-data function. One module is required at each system end of any connection.

D-Channel Handler description

This section provides descriptions of the D-Channel (DCH) cards, the MSDL card, and the Downloadable D-Channel Daughterboard.

NT6D11 DCH

Power requirements

The power requirements for the NT6D11AB/11AE/AF DCH are:

•

+5 volts at 3 amperes

•

+12 volts at 75 milliamperes

•

-12 volts at 75 milliamperes

DCH/PRI interface

The NT6D11AB/AE/AF DCHs connect to the PRI2 cards by means of a special RS422 cable, the QCAD328A, which is a special RS422 cable; refer to "QCAD328" (page 300) of the Cabling chapter for more details.

DCH faceplate

NT6D11AB/AE/AF DCHs have one Light Emitting Diode (LED), to indicate an active or inactive state, and two external connectors:

•

Port J1 is a standard asynchronous port providing an interface for non-PRI applications.

Note: This connection will not support an Add-on Data Module (ADM) terminal.

•

Port J2 is the D-Channel Interface port.

Figure 2 "NT6D11 DCH faceplate layout" (page 21) shows the faceplate

layout.

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Figure 2 NT6D11 DCH faceplate layout

QPC757 DCH 21

QPC757 DCH

Power requirements

The power requirements for the QPC757 DCH are:

•

+5 volts at 3 amperes

•

+12 volts at 50 milliamperes

•

–12 volts at 50 milliamperes

DCH/PRI interface

The QPC757 DCH connects to the QPC720 PRI via a RS-422 cable. The following signals are transmitted across the interface:

•

RCV DATA

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•

RCV CLOCK

•

XMIT CLOCK

•

XMIT READY

•

PRI READY

•

DCH READY

PRI READY and DCH READY are handshake signals.

QPC757 faceplate

The QPC757 DCH, as shown in Figure 3 "QPC757 DCH faceplate layout"

(page 23) has one LED to indicate an active or inactive state and two

external connectors as follows:

•

Port J1 is a standard asynchronous port in LD 48 Note: This connection does not support an Add-on Data Module (ADM)

terminal.

•

Port J2 is the D-Channel Interface port. Note: A QPC757 vintage C is required if the ISL Revert to Conventional

Signaling feature is conﬁgured. The QPC757 vintage D is recommended for combination ISL/PRI networks using NACD or Network Message Services and ISL networks using modems.

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Figure 3 QPC757 DCH faceplate layout

NT6D80 MSDL 23

NT6D80 MSDL

The NT6D80 MSDL card can be used in conjunction with, or independent of, the QPC757, or NT6D11AB/AE/AF DCH.

Power requirements

The NT6D80 MSDL power requirements are:

Voltage

(VAC)

+12 0.10 1.20 4.15

-12 0.10 1.20 4.15

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Current

(Amps)

3.20 16.00 55.36

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Power

(Watts)

Heat

(BTUs)

24 ISDN Primary Rate Interface equipment overview

MSDL/PRI interface

MSDL can connect to PRI trunks through RS-422 or RS-232 interfaces. The interfaces are switch conﬁgured.

MSDL faceplate

The NT6D80 MSDL has one LED to indicate an active or inactive state and four external connectors. Each port can be RS-422 or RS-232 connectors, with either DCE or DTE interfaces. Refer to Figure 4 "NT6D80 MSDL

faceplate layout" (page 24).

Figure 4 NT6D80 MSDL faceplate layout

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NTBK51 Downloadable D-Channel Daughterboard

The NTBK51 is a two port DownloadableD-Channel Daughterboard (DDCH) that has been introduced as an option to the NT6D80 MSDL, the NT5D97 dual-port DTI2/PRI2 card, or the NT5D12 dual-port 1.5 Mb DTI/PRI card.

The NTBK51 supports all the features of the existing 4 port MSDL (NT6D80), and eliminates the need foran external DCH card and associated cables for MSDL applications. The NTBK51 can support a maximum of 32 (16*2) MSDL type D-Channels per system, unlike the MSDL which can support a maximum of 64.

Note 1: Only one version, the NTBK51AA, can be used with the NT5D97, or the NT5D12. The NTBK51BA version has only 30+30 pin connectors (instead of 40+30 pins in the AA version). The missing 10 pins in the BA version prohibits the use of port 0 on the NT5D97, or NT5D12 card.

Note 2: The software allocation for NTBK51AA DDCH is similar to the MSDL. It is both physical and logical, and supports D-Channel functionality only.

NT8D72 PRI2 25

Note 3: Port 0 has to be an even loop on the DDP2, and Port 1 has to be an odd loop. Port 2 and Port 3 should not be conﬁgured.

The connection between the dual-port cards and the DDCH daughterboard is made using two headers: one 30 pin and one 40 pin connector.

Standard PRI cards

This section provides a description of the standard ISDN PRI cards, namely the NT8D72 (AB/BA) PRI2 card, and the QPC720 1.5 Mb PRI card.

NT8D72 PRI2

Power requirements

The NT8D72AB and NT8D72BA PRI use power and ground connections from the backplane. Power requirements are:

+5 volts at 4 amperes +12 volts at 50 milliamperes

-12 volts at 50 milliamperes

NT8D72 faceplate

The NT8D72 contains ﬁve LEDs and six external connectors. Figure 5

"NT8D72 PRI faceplate layout" (page 26) shows the faceplate layout.

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Figure 5 NT8D72 PRI faceplate layout

Table 2 "NT8D72 PRI External connectors" (page 26) gives information

about the external connectors located on the NT8D72 PRI2 faceplate.

Table 2 NT8D72 PRI External connectors

Faceplate Destination Type Description

J1 9-pin female, D-connector Reference Clock 0 interface J2 9-pin female, D-connector Reference Clock 1 interface J3 36-pin connector Loop interface J4 15-pin male, D-connector External digital trunk J5 15-pin male, D-connector D-Channel interface J6 15-pin female, D-connector Echo Canceller/RS-232 interface

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NT8D72 PRI2 27

Faceplate Destination Type Description

RCV MON Miniature bantam jack Monitor DSI from network XMT MON Miniature bantam jack Monitor DSI from PRI

Cable requirements

Table 3 "NT8D72AB and NT8D72BA PRI: Cables and cable lengths" (page

27) lists the types of cable used and the lengths required for internal and

external NT8D72 PRI2 connections.

Note: No additional cabling is required fornB+D conﬁgurations. Multiple PRIs and the D-Channel are associated at the PRI prompt in LD 17.

Table 3 NT8D72AB and NT8D72BA PRI: Cables and cable lengths

Maximum length

Cable Type From To

(meters)

NT8D79AA PRI card Clock controller (CC-0) NT8D79AA PRI card Clock controller (CC-1) QCAD328A PRI card DCH card QCAD328B PRI card DCH card QCAD328C PRI card DCH card QCAD328D PRI card DCH card NTND26AA PRI card MSDL NTND26AB PRI card MSDL NTND26AC PRI card MSDL NTND26AD PRI card MSDL NT8D85AB PRI card Network Network Card RS-232 PRI card Echo canceller NT8D7207 PRI card I/O panel NT8D7205 I/O panel

crossconnect

Carrier interface

The NT8D72 PRI2 provides an interface to the 2Mb external digital line either directly or through an ofﬁce repeater, echo canceller or line terminating unit (LTU).

2.13

1.8

5.5

10.67

15.24

1.8

5.5

10.67

15.24

3.05

15.24

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Echo canceller interface

Echo cancellers are required only on satellite transmission circuits. The echo canceller detects the length of the loop, and then cancels out reﬂected transmission. (Callers will not hear echoes of their own voices reﬂecting back to them from the far end of the call.)

The echo canceller’s control protocol must conform with that of the Tellabs Model 251. Both the echo canceller and the PRI circuit card act as Data Terminal Equipment (DTE).

QMT21 High Speed Data Module

The QMT21 High Speed Data Module supports the 64K Clear Data feature. (It allows data terminating equipment (DTE) to send and receive 64-Kb/s clear data.) The QMT21B is required for Large System to Large System conﬁgurations.

QPC720 PRI for 1.5/2.0 Mb gateway

Systems which are being used as a 1.5/2.0 Mb Gateway, one or more QPC720 (1.5 Mb) Primary Rate Interface circuit cards will also be needed.

Note: Older vintages of the QPC720 PRI cannot be used for Gateway applications. The 1.5/2.0 Mb Gateway feature requires the use of a QPC720 circuit card with ﬁrmware updated to provide modiﬁed PAD values.

Clock operation for the NT8D72

There are two types of clock operation—tracking mode and free-run mode.

Tracking mode

In tracking mode, the PRI loop supplies an external clock reference to a clock controller. Two PRI loops can operate in tracking mode, with one deﬁned as the primary reference source for clock synchronization, the other deﬁned as the secondary reference source. The secondary reference acts as a back-up to the primary reference.

As shown in Figure 6 "Clock controller primary and secondary tracking"

(page 29), a system with dual CPUs can have two clock controllers (CC-0

and CC-1). One clock controller acts as a back-up to the other. The clock controllers should be completely locked to the reference clock.

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Figure 6 Clock controller primary and secondary tracking

NT8D72 PRI2 29

Free run (non-tracking) mode

The clock synchronization of the system can operate in free-run mode if:

•

no loop is deﬁned as the primary or secondary clock reference,

•

the primary and secondary references are disabled, or

•

the primary and secondary references are in local alarm

Reference clock errors

The system software checks at intervals of 1 to 15 minutes to see if a clock controller or reference-clock error has occurred. (The interval of this check can be conﬁgured in LD 73.)

In tracking mode, at any one time, there is one active clock controller which is tracking on one reference clock. If a clock-controller error is detected, the system switches to the back-up clock controller, without affecting which reference clock is being tracked.

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A reference-clock error occurs when there is a problem with the clock driver or with the reference clock at the far end. If the clock controller detects a reference-clock error, the reference clocks are switched.

Automatic clock recovery

A command for automatic clock recovery can be selected in LD 60 with the command EREF.

A PRI loop is disabled when it enters a local-alarm condition. If the local alarm is cleared, the loop is enabled automatically. When the loop is enabled, clock tracking is restored in the following conditions:

1. If the loop is assigned as the primary reference clock but the clock controller is tracking on the secondary reference or in free-run mode, it is restored to tracking on primary.

2. If the loop is assigned as the secondary reference clock but the clock controller is in free-run mode, it is restored to tracking on secondary.

If the clock check indicates the switch is in free-run mode:

1. Tracking is restored to the primary reference clock if deﬁned.

QPC720 PRI

Power requirements

2. If the primary reference is disabled or in local alarm, tracking is restored to the secondary reference clock if deﬁned.

Note: If the switch is put into free-run mode by the craftsperson, it will resume tracking on a reference clock unless the clock-switching option has been disabled (LD 60, command MREF), or the reference clock has been "undeﬁned" in the database.

Automatic clock switching

If the EREF command is selected in LD 60, tracking on the primary or secondary reference clock is automatically switched in the following manner:

1. If software is unable to track on the assigned primary reference clock, it switches to the secondary reference clock and sends appropriate DTC maintenance messages.

2. If software is unable to track on the assigned secondary reference clock, it switches to free run.

The QPC720 PRI card is required for PRI operation in all machine types.

The QPC720 PRI uses power and ground from the backplane. This card does not require an intelligent bus. Power requirements are:

•

+5 volts at 6 amperes

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