Nortel 1000 User Manual

Nortel Communication Server 1000

Circuit Card Reference

Release: 5.5 Document Revision: 02.06

www.nortel.com

NN43001-311

Nortel Communication Server 1000 Release: 5.5 Publication: NN43001-311 Document status: Standard Document release date: 27 August 2008

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.

Contents

New in this release 13

Other 13

How to get help 15

Getting help from the Nortel web site 15 Getting help over the telephone from a Nortel Solutions Center 15 Getting help from a specialist by using an Express Routing Code 15 Getting help through a Nortel distributor or reseller 16

Overview 17

Contents 17 Line cards 18 Trunk cards 45 Installation 46 Operation 47 Serial Data Interface (SDI) cards 55

Revision History 13

Circuit card installation 59

Contents 59 Card slots - Large System 59 Circuit and installation 60 Precautions 63 Installing a circuit card 64

Acceptance tests 69

Contents 69 Introduction 69 Conference cards 69 Digitone receiver cards 72 Line cards 72 Multifrequency sender cards 73 Multifrequency signaling cards 74 Network cards 74 Trunk cards 75 Tone and digit switch cards 76

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Option settings 79

Contents 79 Circuit card grid 80 NT1R20 Off-Premise Station card 81 NT5D12 Dual DTI/PRI (DDP) card 82 NT6D42 Ringing Generator DC 87 NT6D80 Multi-purpose Serial Data Link card 89 NT8D14 Universal Trunk card 90 NT8D15 E and M Trunk card 92 NT8D17 Conference/TDS card 93 NT8D21 Ringing Generator AC 94 NT8D22 System Monitor 94

NT8D22 jumper settings 98 NT8D41BA Quad Serial Data Interface Paddle Board 99 QPC43 Peripheral Signaling card 101 QPC414 Network card 101 QPC441 3-Port Extender cards 101 QPC841 4-Port Serial Data Interface card 104

NT1R20 Off-Premise Station Analog Line card 107

Contents 107 Introduction 107 Physical description 109 Functional description 111 Electrical specifications 123 Operation 126 Connector pin assignments 131 Configuring the OPS analog line card 132 Application 136

NT4N39AA CP Pentium IV Card 151

Contents 151 Introduction 151 Physical description 151 Functional description 154 Front panel connector pin assignments 155

NT5D11 and NT5D14 Lineside T1 Interface cards 159

Contents 159 Introduction 159 Physical description 160 Functional description 167 Electrical specifications 176 Installation and configuration 179

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Clocking Requirement 214

Connecting MGC DECT Clock Reference Cable 214 Man-Machine T1 maintenance interface software 217 Applications 247

NT5D33 and NT5D34 Lineside E1 Interface cards 255

Contents 255 Introduction 255 Physical description 256 Functional description 260 Electrical specifications 264 Installation and Configuration 266 Installation 272 Clocking Requirement 282

Connecting MGC DECT Clock Reference Cable 282 Man-Machine E1 maintenance interface software 284 Applications 307

NT5D60/80/81 CLASS Modem card (XCMC) 311

Contents 311 Introduction 311 Physical description 312 Functional description 312 Electrical specifications 316 Configuration 317

NT5D97 Dual-port DTI2 PRI2 card 319

Contents 319 Introduction 319 Physical description 320 Functional description 335 Architecture 345 Operation 350

NT5K02 Flexible Analog Line card 357

Contents 357 Introduction 357 Applications 358

NT5K21 XMFC/MFE card 359

Contents 359 Introduction 359 MFC signaling 359 MFE signaling 361 Sender and receiver mode 362 Physical specifications 364

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NT6D70 SILC Line card 367

Contents 367 Introduction 367 Physical description 368 Functional description 369

NT6D71 UILC line card 377

Contents 377 Introduction 377 Physical description 378 Functional description 378

NT6D80 MSDL card 383

Contents 383 Introduction 383 Physical description 384 Functional description 385 Engineering guidelines 390 Installation 395 Maintenance 402 Replacing MSDL cards 408 Symptoms and actions 409 System disabled actions 409

NT8D02 and NTDK16 Digital Line cards 413

Contents 413 Introduction 413 Physical description 415 Functional description 419 Electrical specifications 433 Digital line interface specifications 433 Connector pin assignments 439 Configuration 442

NT8D09 Analog Message Waiting Line card 449

Contents 449 Introduction 449 Physical description 452 Functional description 455 Connector pin assignments 473 Configuration 474

NT8D14 Universal Trunk card 483

Contents 483 Introduction 483 Physical description 488

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Functional description 493 Operation 501 Electrical specifications 592 Connector pin assignments 602 Configuration 606 Applications 627

NT8D15 E and M Trunk card 633

Contents 633 Introduction 633 Physical description 637 Functional description 641 Operation 665 Electrical specifications 691 Connector pin assignments 696 Configuration 702 Applications 713

NT8D41BA Quad Serial Data Interface Paddle Board 721

Contents 721 Introduction 721 Physical description 722 Functional description 722 Connector pin assignments 724 Configuring the QSDI paddle board 725 Applications 729

NTAG26 XMFR card 739

Contents 739 Physical specifications 742 Introduction 742

NTAK02 SDI/DCH card 747

Contents 747 Introduction 747 NTAK02 SDI/DCH card 747

NTAK09 1.5 Mb DTI/PRI card 757

Contents 757 Introduction 757 Physical description 758 Functional description 765 Architecture 767

NTAK10 2.0 Mb DTI card 777

Contents 777 Introduction 777

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Physical description 778 Functional description 781 Architecture 783

NTAK20 Clock Controller daughterboard 803

Contents 803 Introduction 803 Physical description 809 Functional description 810

NTAK79 2.0 Mb PRI card 823

Contents 823 Introduction 823 Physical description 824 Functional description 832 Architecture 833

NTAK93 D-channel Handler Interface daughterboard 853

Contents 853 Introduction 853 Physical description 855 Functional description 856

NTBK22 MISP card 861

Contents 861 Introduction 861 Physical description 861 Functional description 862

NTBK50 2.0 Mb PRI card 867

Contents 867 Introduction 867 Physical description 868 Functional description 873 Architecture 875

NTBK51 Downloadable D-channel Handler daughterboard 889

Contents 889 Introduction 889 Physical description 890 Functional description 892 Download operation 897

NTCK16 Generic Central Office Trunk cards 901

Contents 901 Introduction 901 Physical description 902 Functional description 903

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Operation 903 Electrical specifications 905 Connector pin assignments 906 Configuration 906 Applications 914

NTDK20 Small System Controller card 917

Contents 917 Introduction 917 Memory 919 100BaseT IP daughterboards 920 PC card interface 923 Security device 924 SDI ports 924 Conferencing 925 Media Gateway/Media Gateway Expansion card slot assignment 925

NTDW60 Media Gateway Controller Card 929

Contents 929 Introduction 929 Processor 932 Ethernet ports 932

External connections 932

Internal connections 932 Expansion daughterboards 932 Backplane interface 932 Serial data interface ports 933

TTY default settings 933

MGC serial port configuration change 933 Faceplate LED display 933

Faceplate LED display 934

NTDW61 and NTDW66 Common Processor Pentium Mobile Card 935

Contents 935 Introduction 935 Cabinet/chassis support 938 Media storage 939

Fixed media drive 939

Removable media drive 939

Hard disk drive 939 Memory 939 Ethernet interfaces 939

ELAN 939

HSP 939

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TLAN 939 Serial data interface ports 940

TTY parameters 940 USB 2.0 port 940 Security device 940 Faceplate 941 Faceplate buttons 943

Reset 943

Init 943 DIP switch 943 LED indicators 943

Status LED 943

Active CPU LED 943

Ethernet LEDs 944

Removable and fixed media drive LEDs 944

NTDW62 and NTDW64 Media Gateway Controller Daughterboards 945

Contents 945 Introduction 945 Media Gateway Controller card 945

Daughterboard configurations 946

NTDW65 Voice Gateway Media Card 949

Contents 949 Introduction 949 Ethernet ports 950

External connections 950

Internal connections 950 Backplane interfaces 950 Serial data interface ports 951

TTY settings 951 Faceplate LED display 951

NTRB21 DTI/PRI/DCH TMDI card 953

Contents 953 Introduction 953 Physical description 955 Functional description 963 Software description 965 Hardware description 965 Architecture 967

NTVQ01xx Media Card 981

Contents 981 Physical description 981

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Hardware architecture 982 Functional description 984

QPC841 Quad Serial Data Interface card 985

Contents 985 Introduction 985 Physical description 986 Functional description 987 Connector pin assignments 988 Configuring the QSDI card 990 Applications 994

The TDS/DTR card 997

Contents 997 Introduction 997 Features 997

LAPB Data Link Control protocol 1009

Contents 1009 Introduction 1009 Operation 1009 Frame structure 1010 LAPB balanced class of procedure 1011 Commands and responses 1011 Description of procedure 1012

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New in this release

This technical document provides information about circuit cards for the CS 1000 Release 5.5. Non-supported circuit cards have been deleted from the document.

Other

Revision History

August 2008

December 2007

June 2007

May 2007

August 2005

September 2004

October 2003

Standard 02.06. This document is up-issued to include additional information in the section ’Jumper and switch settings’ for Release 5.5.

Standard 02.05. This document has been up-issued to support Communication Server Release 5.5.

Standard 01.02. This document has been up-issued to reflect changes in technical content for CoreNet shelf supporting CP PII and CP PIV function.

Standard 01.01. This document is up-issued to support Nortel Communication Server 1000 Release 5.0. This document contains information previously contained in the following legacy document, now retired, Circuit Card (553-3001-211).

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

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

Standard 1.00. This 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:

• Line Cards: Description, (553-3001-105)

• Trunk Cards: Description, (553-3001-106)

• Serial Data Interface Cards: Description, (553-3001-107)

• NT7D16 Data Access Card: Description and operation, (553-3001-191)

• Multi-purpose Serial Data Link: Description, (553-3001-195)

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14 New in this release

• Circuit Cards: Installation and Testing, (553-3001-211)

• Option 11C and 11C mini Technical Reference Guide, (553-3011-100)

(Content from Option 11C and 11C mini Technical Reference

Guide, (553-3011-100) also appears in Telephones and Consoles Fundamentals (NN43001-567)

• Circuit Card Reference, (553-3023-211)

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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:

ww.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 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:w

ww.nortel.com/callus

Getting help from a specialist by using an Express Routing Code

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:w

ww.nortel.com/erc

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16 How to get help

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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Overview

Contents

This section contains information on the following topics:

“Line cards” (page 18)

“Installation” (page 19) “Operation” (page 21) “Analog line interface units” (page 26) “Digital line interface units” (page 28) “Analog line call operation” (page 30) “Digital line call operation” (page 34) “Lineside T1 and E1 call operation” (page 34) “Voice frequency audio level” (page 43) “Off-premise line protection” (page 43) “Line protectors” (page 43) “Line protection grounding” (page 44) “Line and telephone components” (page 44)

“Trunk cards” (page 45)

“Host interface bus” (page 48) “Trunk interface unit” (page 53)

“Serial Data Interface (SDI) cards” (page 55)

“Uses” (page 56) “Features” (page 56) “Specifications” (page 56) “Installation” (page 57) “Maintenance” (page 58)

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18 Overview

Line cards

The following line cards are designed using the Intelligent Peripheral Equipment (IPE) architecture and are recommended for use in all new system designs.

Each of the line cards was designed to fit a specific system need. Table 1

"Line card characteristics" (page 18) lists the line card characteristics.

Table 1 Line card characteristics

Part Number Description Lines

NT1R20 Off-premise

station analog line card

NT5D11 Lineside T1

Interface card

NT5D33/34Lineside E1

Interface card

Supervised Line Type

Analog Interrupted dial

T1 None Yes IPE

E1 None Yes IPE

Message Waiting

tone

Analog

Lines Architecture

Yes IPE

NT8D02 Digital Line

card (16 voice/16 data)

NT8D09 Analog

Message Waiting Line card

NT1R20 Off-Premise Station Analog Line card

The NT1R20 Off-Premise Station (OPS) Analog Line card is an intelligent eight-channel analog line card designed to be used with 2-wire analog terminal equipment such as analog (500/2500-type) telephones and analog modems. Each line has integral hazardous and surge voltage protection to protect the system from damage due to lightning strikes and accidental power line connections. This card is normally used whenever the phone lines leave the building in which the switch is installed. The OPS line card supports message waiting notification by interrupting the dial tone when the receiver is first picked up. It also provides battery reversal answer and disconnect analog line supervision and hook flash disconnect analog line supervision features.

Digital Message

waiting signal forwarded to digital phone for display

Analog Lamp No IPE

No IPE

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Line cards 19

NT5D11 and NT5D14 Lineside T1 interface card

The NT5D11/14 Lineside T1 Interface card is an intelligent 24-channel digital line card that is used to connect the switch to T1-compatible terminal equipment on the lineside. The T1-compatible terminal equipment includes voice mail systems, channel banks containing FXS cards, and key systems such as the Nortel Norstar. The Lineside T1 card differs from trunk T1 cards in that it supports terminal equipment features such as hook-flash, transfer, hold, and conference. It emulates an analog line card to the system software.

NT5D33 and NT5D34 Lineside E1 Interface card

The NT5D33/34 Lineside E1 Interface card is an intelligent 30-channel digital line card that is used to connect the switch to E1-compatible terminal equipment on the lineside. The E1-compatible terminal equipment includes voice mail systems. The lineside E1 card emulates an analog line card to the system software.

NT8D02 Digital Line card

The NT8D02 Digital Line card is an intelligent 16-channel digital line card that provides voice and data communication links between a CS 1000E, CS 1000M, and Meridian 1switch and modular digital telephones. Each of the 16 channels support voice-only or simultaneous voice and data service over a single twisted pair of standard telephone wire.

NT8D09 analog message waiting line card

The NT8D09 Analog Message Waiting Line card is an intelligent 16-channel analog line card designed to be used with 2-wire terminal equipment such as analog (500/2500-type) telephones, modems, and key systems. This card can also provide a high-voltage, low-current signal on the Tip and Ring pair of each line to light the message waiting lamp on phones equipped with that feature.

Installation

This section provides a high-level description of how to install and test line cards.

IPE line cards can be installed in any slot of the NT8D37 IPE module.

Figure 1 "IPE line cards shown installed in an NT8D37 IPE module" (page

20) shows where an IPE line card can be installed in an NT8D37 IPE

module.

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20 Overview

Figure 1 IPE line cards shown installed in an NT8D37 IPE module

When installing line cards, follow these general procedures:

Step Action 1 Configure the jumpers and switches on the line card (if any) to

meet system needs.

2 Install the line card into the selected slot. 3 Install the cable that connects the backplane connector on the

IPE module to the module I/O panel.

4 Connect a 25-pair cable from the module I/O panel connector to

the Main Distribution Frame (MDF).

5 Connect the line card output to the selected terminal equipment

at the MDF.

6 Configure the individual line interface unit using the Analog

(500/2500-type) Telephone Administration program LD 10 for analog line interface units and Multi-line Telephone Administration program LD 11 for digital line interface units.

--End--

Once these steps are complete, the terminal equipment is ready for use.

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Operation

This section describes how line cards fit into the CS 1000E, CS 1000M, and Meridian 1architecture, the busses that carry signals to and from the line cards, and how they connect to terminal equipment. These differences are summarized in Table 2 "IPE module architecture" (page 21).

Host interface bus

Cards based on the IPE bus use a built-in microcontroller. The IPE microcontroller is used to do the following:

•

• configure the card according to instructions issued by the system

•

Table 2 IPE module architecture

Parameter IPE

Line cards 21

perform local diagnostics (self-test)

report back to the system information such as card identification (type, vintage, and serial number), firmware version, and programmed configuration status)

Card Dimensions 31.75 x 25.4 x 2.2 cm (12.5 x10.0 x 0.875

in.). Network Interface DS-30X Loops Communication Interface card LAN Link Microcontroller 8031/8051 Family Peripheral Interface card NT8D01 Controller card Network Interface card NT8D04 Superloop Network card Modules NT8D37 IPE module

Intelligent Peripheral Equipment

IPE line cards all share a similar architecture. Figure 2 "Typical IPE analog

line card architecture" (page 23) shows a typical IPE line card architecture.

The various line cards differ only in the number and types of line interface units.

The switch communicates with IPE modules over two separate interfaces. Voice and signaling data are sent and received over DS-30X loops, and maintenance data is sent over a separate asynchronous communication link called the card LAN link.

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22 Overview

Signaling data is information directly related to the operation of the telephone line. Some examples of signaling commands include:

•

off-hook/on-hook

•

ringing signal on/off

• message waiting lamp on/off

Maintenance data is data relating to the configuration and operation of the IPE card, and is carried on the card LAN link. Some examples of maintenance data include:

•

polling

• reporting of self-test status

• CP initiated card reset

•

reporting of card ID (card type and hardware vintage)

• reporting of firmware version

•

downloading line interface unit parameters

•

reporting of line interface unit configuration

•

enabling/disabling of the DS-30X network loop bus

• reporting of card status or T1 link status

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Figure 2 Typical IPE analog line card architecture

Line cards 23

DS-30X loops The line interfaces provided by the line cards connect

to conventional 2-wire (tip and ring) line facilities. IPE analog line cards convert the incoming analog voice and signaling information to digital form and route it to the Call Server over DS-30X network loops. Conversely, digital voice and signaling information from the Call Server is sent over DS-30X network loops to the analog line cards where it is converted to analog form and applied to the line facility.

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24 Overview

IPE digital line cards receive the data from the digital phone terminal as 512 kHz Time Compressed Multiplexed (TCM) data. The digital line card converts that data to a format compatible with the DS-30X loop and transmits it in the next available timeslot. When a word is received from the DS-30X loop, the digital line card converts it to the TCM format and transmits it to the digital phone terminal over the digital line facility.

A separate dedicated DS-30X network loop is extended between each IPE line/trunk card and the controller cards within an IPE module. A DS-30X network loop is composed of two synchronous serial data buses. One bus transports in the Transmit (Tx) direction towards the line facility and the other in the Receive (Rx) direction towards the CS 1000E, CS 1000M, and Meridian 1.

Each bus has 32 channels for Pulse Code Modulated (PCM) voice data. Each channel consists of a 10-bit word. See Figure 3 "DS-30X loop data

format" (page 25). Eight of the 10 bits are for PCM data, one bit is the call

signaling bit, and the last bit is a data valid bit. The eight-bit PCM portion of a channel is called a timeslot. The DS-30X loop is clocked at 2.56 Mbps (one-half the 5.12 MHz clock frequency supplied by the controller card). The timeslot repetition rate for a single channel is 8 kHz. The controller card also supplies a locally generated 1 kHz frame sync signal for channel synchronization.

Signaling data is transmitted to and from the line cards using the call signaling bit within the 10-bit channel. When the line card detects a condition that the switch needs to know about, it creates a 24-bit signaling word. This word is shifted out on the signaling bit for the associated channel one bit at a time during 24 successive DS-30X frames. Conversely, when the switch sends signaling data to the line card, it is sent as a 24-bit word divided among 24 successive DS-30X frames.

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Figure 3 DS-30X loop data format

DS-30Y network loops extend between controller cards and superloop network cards in the Common Equipment (CE). They function in a manner similar to DS-30X loops. See Figure 5 "Digital line interface unit block

diagram" (page 29).

Line cards 25

A DS-30Y loop carries the PCM timeslot traffic of a DS-30X loop. Four DS-30Y network loops form a superloop with a capacity of 128 channels (120 usable timeslots). See Communication Server 1000M and Meridian 1 Large System Planning and Engineering (NN43021-220) for more information on superloops.

Card LAN link Maintenance communication is the exchange of control and status data between IPE line or trunk cards and the Call Server by way of the NT8D01 Controller card. Maintenance data is transported through the card LAN link. This link is composed of two asynchronous serial buses (called the Async card LAN link in Figure 2 "Typical IPE

analog line card architecture" (page 23)). The output bus is used by the

system controller for output of control data to the line card. The input bus is used by the system controller for input of line card status data.

A card LAN link bus is common to all of the line/trunk card slots within an IPE module. This bus is arranged in a master/slave configuration where the controller card is the master and all other cards are slaves. The module backplane provides each line/trunk card slot with a unique hardwired slot address. This slot address enables a slave card to respond when addressed by the controller card. The controller card communicates with only one slave at a time.

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26 Overview

Analog line interface units

In normal operation, the controller card continually scans (polls) all of the slave cards connected to the card LAN to monitor their presence and operational status. The slave card sends replies to the controller on the input bus along with its card slot address for identification. In its reply, the slave informs the controller if any change in card status has taken place. The controller can then prompt the slave for specific information. Slaves only respond when prompted by the controller; they do not initiate exchange of control or status data on their own.

When an IPE line card is first plugged into the backplane, it runs a self-test. When the self-test is completed, a properly functioning card responds to the next controller card poll with the self-test status. The controller then queries for card identification and other status information. The controller then downloads all applicable configuration data to the line card, initializes it, and puts it into an operational mode.

Once the 8-bit digital voice signal has been received by the analog line card, it must be converted back into an analog signal, filtered, converted from a 4-wire transmission path to a 2-wire transmission path, and driven onto the analog telephone line.

Figure 4 "Typical analog line interface unit block diagram" (page 27) shows

a typical example of the logic that performs these functions. Each part of the analog line interface unit is discussed in the following section.

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Figure 4 Typical analog line interface unit block diagram

Line cards 27

Coder/Decoder circuit

The Coder/Decoder (CODEC) performs Analog to Digital (A/D) and Digital to Analog (D/A) conversion of the line analog voiceband signal to and from a digital PCM signal. This signal can be coded and decoded using either the A-Law or the µ-Law companding algorithm.

On some analog line cards, the decoding algorithm depends of the type of CODEC installed when the board is built. On others, it is an option selected using a software overlay.

Variable gain filters

Audio signals received from the analog phone line are passed through a low-pass A/D monolithic filter that limits the frequency spread of the input signal to a nominal 200 to 3400 Hz bandwidth. The audio signal is then applied to the input of the CODEC. Audio signals coming from the CODEC are passed through a low-pass A/D monolithic filter that integrates the amplitude modulated pulses coming from the CODEC, and then filters and

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28 Overview

amplifies the result. On some of the line cards, the gain of these filters can be programmed by the system controller. This allows the system to make up for line losses according to the loss plan.

Balancing network

Depending on the card type, the balancing network provides a 600

/4, 3COM or 3CM2 impedance matching network. It also converts

900

/4,

the 2-wire transmission path (tip and ring) to a 4-wire transmission path (Rx/ground and Tx/ground). The balancing network is usually a transformer/analog (hybrid) circuit combination, but can also be a monolithic Subscriber Line Interface Circuit (SLIC) on the newer line cards.

Line interface and foreign voltage protection

The line interface unit connects the balancing network to the telephone tip and ring pairs. The off-premise line card (NT1R20) has circuitry that protects the line card from foreign voltage surges caused by accidental power line connections and lightning surges. This protection is necessary if the telephone line leaves the building where the switch is installed.

The line interface unit has a relay that applies the ringing voltage onto the phone line. See Figure 4 "Typical analog line interface unit block

diagram" (page 27). The RSYNC signal from the 20 Hz (nominal) ringing

voltage power supply is used to prevent switching of the relay during the current peak. This eliminates switching glitches and extends the life of the switching relay.

The off-hook detection circuit monitors the current draw on the phone line. When the current draw exceeds a preset value, the circuit generates an off-hook signal that is transmitted back to the system controller.

The message waiting circuit on message waiting line cards monitors the status of the message waiting signal and applies –150 V dc power to the tip lead when activated. This voltage is used to light the message waiting lamps on phones that are equipped with that feature. The high voltage supply is automatically disconnected when the phone goes off-hook. Newer line cards can sense when the message waiting lamp is not working and can report that information back to the system controller.

Digital line interface units

The NT8D02 Digital Line card provides voice and data communication links between a switch and modular digital telephones. These lines carry multiplexed PCM voice, data and signaling information as Time Compression Multiplexed (TCM) loops. Each TCM loop can be connected to a Nortel "Meridian Modular Digital" telephone.

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Line cards 29

The digital line interface card contains one or more digital line interface units. See Figure 5 "Digital line interface unit block diagram" (page 29). Each digital line interface unit contains a Digital Line Interface Circuit (DLIC). The purpose of each DLIC is to demultiplex data from the DS-30X Tx channel into integrated voice and data bitstreams and transmit those bitstreams as Bi-Polar Return to Zero, Alternate Mark Inversion (BPRZ-AMI) data to the TCM loop. It also does the opposite: receives BPRZ-AMI bitstreams from the TCM loop and multiplexes the integrated voice and data bitstream onto the DS-30X Rx channel.

The 4-wire to 2-wire conversion circuit converts the 2-wire tip and ring leads into a 4-wire (Tx and ground and RX and ground) signal that is compatible with the digital line interface circuit.

TCM loop interfaces

Each digital phone line terminates on the digital line card at a TCM loop interface circuit. The circuit provides transformer coupling and foreign voltage protection between the TCM loop and the digital line interface circuit. It also provides power for the digital telephone.

Figure 5 Digital line interface unit block diagram

To prevent undesirable side effects from occurring when the TCM loop interface cannot provide the proper signals on the digital phone line, the system controller can remove the ±15 V dc power supply from the TCM loop interface. This happens when either the card gets a command from the NT8D01 Controller card to shut down the channel, or when the digital line card detects a loss of the 1 KHz frame synchronization signal.

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30 Overview

Analog line call operation

Each TCM loop interface circuit can service loops up to 3500 ft. in length when using 24 gauge wire. The circuit allows for a maximum ac signal loss of 15.5 dB at 256 KHz and a maximum DC loop resistance of 210 ohms.

Signaling

The digital line interface units also contain signaling and control circuits that establish, monitor, and take down call connections. These circuits work with the system controller to operate the digital line interface circuits during calls. The circuits receive outgoing call signaling messages from the controller and return incoming call status information to the controller over the DS-30X network loop.

The applications, features, and signalling arrangements for each line interface unit are configured in software and implemented on the card through software download messages. When an analog line interface unit is idle, it provides a voltage near ground on the tip lead and a voltage near –48 V dc on the ring lead to the near-end station. (The near-end station is the telephone or device that is connected to the analog line card by the tip and ring leads.) An on-hook telephone presents a high impedance toward the line interface unit on the card.

Incoming calls

Incoming calls to a telephone that is connected to an analog line card can originate either from stations that are local (served by the PBX), or remote (served through the Public Switched Telephone Network (PSTN)). The alerting signal to a telephone is 20 Hz (nominal) ringing. When an incoming call is answered by the near-end station going off-hook, a low-resistance dc loop is placed across the tip and ring leads (towards the analog line card) and ringing is tripped. See Figure 6 "Call connection

sequence - near-end station receiving call" (page 31).

Outgoing calls

For outgoing calls from the near-end station, a line interface unit is seized when the station goes off-hook, placing a low-resistance loop across the tip and ring leads towards the analog line card. See Figure 7 "Call

connection sequence - near-end originating call" (page 32). When the card

detects the low-resistance loop, it prepares to receive digits. When the system is ready to receive digits, it returns dial tone. Outward address signaling is then applied from the near-end station in the form of loop (interrupting) dial pulses or DTMF tones.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311 02.06 Standard

27 August 2008

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