Case Communications 3200 Operation Manual

X723-300151 0-1 Issue 2

3200 Digital Multiplexer

Operation Manual

© Case Communications Ltd 1997

Unit 15, Riverside Business Centre, Victoria Street, High Wycombe, Bucks HP11 2LT
Web: www.casecomms.com Email: [e-mail]
Tel (UK): 08700 263 740 Tel (International): [phone]
Fax (UK): 08700 263 741 Fax (International): [phone]

X723-3001510-2Issue 2

STATUTORY NOTICES

Case Communications Ltd. declare that this product conforms with the requirements of the European
Communities Council Directive of 73/23/EEC on the harmonisation of the laws of Member States to electrical
equipment designed for use within certain voltage limits.

Case Communications Ltd declare that this product conforms with the protection requirements of Council
Directive 89/336/EEC on the approximation of the laws of the member states relating to electromagnetic
protection.

This equipment has been tested using shielded cables supplied by Case Communications Ltd. These cables, or
equivalents, must be used to ensure compliance with this declaration.

All PCB assemblies contain Electrostatic Sensitive Devices (ESDs) which may be permanently damaged if
incorrectly handled. This equipment must be handled in accordance with BS5783 code of practice for the
handling of electrostatic sensitive devices.

The System Control Board DT300 contains a Nickel-Cadmium (NiCad) battery which contains toxic
substances. The following instructions must be followed when handling or disposing:

(i) Non-conductive anti-static bags must be used for transportation and storage of the board

assembly.

(ii) Care must be taken not to short-circuit the battery.

(iii) The battery must not be disposed of on an open fire.

The earth stud on the rear of the equipment must be connected to earth.
The mains powered power shelf must be connected to earth via the power lead. Protective covers on this

unit should only be removed by authorised personnel.
The DC powered power shelves must be connected to earth via the marked earth terminal.
The 3400 and 3800 must not be transported with the power supply units fitted to the chassis since this can

cause dislocation of the card guides if the unit is subjected to impact

Case Communications Limited has made all reasonable efforts to ensure the accuracy of the content of this document but the information
contained herein does not constitute a warranty of performance of the equipment and/or software described and no specifications given
form part of any contract. This document does not constitute a licence to use or copy any software described herein and any such
software must only be used in accordance with the terms of the licence supplied herewith.

Case Communications Limited reserves the right to make alterations to the equipment and software described without notice and assumes no
liability for any loss or damage caused as a result of use of this document whether because of out of date or inaccurate information or
otherwise.

Product and manufacturers' names referred to in this document are used for identification purposes only and Case Communications Limited
acknowledges the intellectual property rights of their respective owners in the same.

This document is the copyright of Case Communications Limited and may not be reproduced, copied or stored in any computerised retrieval
system by any means without the express written permission of Case Communications Limited.

Published by Case Communications Technical Publications Department

X723-300151 0-3 Issue 2

STATUTORY NOTICES

APPROVAL

The approval number for the 3200 multiplexer is NS/3660/12/H/452538.
The 3200 equipment is approved for indirect connection to the PSN via the 4 wire E&M (SSDC5) PABX tie line

ports and G.703 2048 kbit/s PABX ports and for direct connection to G.703 2048kbit/s and X.21 Nx64kbit/s
'Private circuits' subject to the following conditions:-

1)WARNING. Interconnection directly, or by way of other apparatus, of ports marked:­'WARNING. Connect only apparatus complying with BS6301 to this port'
or
'WARNING. Connect only apparatus complying with BS6301 to these ports'
with ports not so marked may produce hazardous conditions on the network. Advice should be obtained from

a competent engineer before such a connection is made.

2)All ports are marked as shown in para 1, and other than those connected to Public Telecommunication
Networks, may only have equipment complying with BS6301 connected to them.

3) Connection of power supply. This apparatus may only be used with Type 3000 power supply equipment.
Other usage will invalidate any approval given to this apparatus if as a result it ceases to comply with
BS6301:1982.

4)The primary DC power source for the equipment must be from a power supply complying with BS6301.

5)For voice frequency circuits the total power to line level must not exceed -13dBm.

6) Voice frequency circuits provided on channel interface cards DTE90 to DTE95 and DT515 may be indirectly
connected via the isolation barrier DT290 to the PSTN or 'Leased lines'. This connection must be made in
accordance with the instructions contained in the relevant operators manual for these cards.

7) Direct connections may only be made to NTTP ports from 2048 kbit/s PCM interfaces utilising the Dual Line
Interface card DT310. The Dual V.11 Card DTE50 and the Dual Nx64k Card DT585, may be directly
connected to 'Private circuits'.

8) Prevention of access by user. If a Ringing Generator is fitted in the chassis o r an external ringing supply is
connected or 2Wire Loop Disconnect cards are fitted, the following applies: This apparatus is intended to be
accessible only to authorised personnel. This apparatus must be installed in a locked room or similar
environment. Failure to prevent such user access will invalidate any approval given to this apparatus.

SAFETY

All interface ports in the multiplexer have a safety status of 'TNV' when a DT579, DTE063 or a DTE064 is

installed, or an external ringing supply is connected. In all other configurations the interface ports have a
safety status of 'SELV' This must be taken into account when connecting the equipment.

For Mains powered multiplexers, the socket outlet supplying this equipment shall be installed near the

equipment and shall be easily accessible.

Czech Republic Statutory Notice

Prístroj musí byt umísten v blizkosti sít’ové zásuvky. K odpojení prístroje od síte slouzi vidlice sít’ového
privodu.

X723-300151 0-4 Issue 2

X723-300151 0-5 Issue 2

Contents

1 Equipment Detail 1-1

1.1 General Description 1-1

1.2 3200 Facilities 1-5

1.2.1 Control of the 3200 1-5

1.2.2 Control Terminal Operating Modes 1-5

1.2.3 Configuration 1-6

1.2.4 Fault Reporting 1-11

1.2.5 Real Time Clock 1-12

1.2.6 Maintenance Facilities 1-12

1.3 Mechanical Description 1-13

1.4 Specifications 1-16

1.4.1 Common Equipment 1-16

1.4.2 Dual LIU Line Signal Characteristics 1-17

1.5 Product Codes 1-21

2 Installation and Commissioning 2-1

2.1 General 2-1

2.1.1 Modes of Operation 2-2

2.1.2 Commands and Control Characters 2-2

2.1.3 Special Input Control Characters 2-3

2.1.4 General Conventions for Verbose Prompts 2-3
and Messages

2.2 Installation 2-4

2.2.1 Unpacking 2-4

2.2.2 Mounting 2-4

2.2.3 Power Connections and Earth Bonding 2-5

2.2.4 Alarm and Control Wiring 2-5

2.2.5 PCM and G.703 Clock Connections 2-7

2.2.6 Data Wiring 2-7

2.2.7 Network Management Connections 2-8

2.2.8 Local Port Connections 2-8

2.2.9 Ringing Voltage Connections 2-9

X723-300151 0-6 Issue 2

2.3 Commissioning 2-11

2.3.1 Link and Switch Settings 2-11

2.3.2 Redundant System Control Card 2-12

2.3.3 Switch on Procedures 2-15

2.3.4 Initial Multiplexer Set-up 2-16

2.3.5 Alarm Indicators 2-16

3 Dual Line Interface Unit 3-1

3.1 General 3-1

3.1.1 TS0 'Not Frame Word' Routing 3-1

3.1.2 Clock Recovery and Selection 3-3

3.1.3 Jitter Attenuation 3-3

3.1.4 Frame Structure 3-3

3.1.5 G.703 Clock Output 3-4

3.1.6 Link Settings 3-4

3.1.7 Switch Settings 3-4

3.1.8 LED Indicators 3-4

3.2 Dual LIU Adaptors 3-5

3.2.1 DT315 75 Ohm I/O Adaptor 3-5

3.2.2 DT316 120 Ohm I/O Adaptor 3-6

4 Management Configuration 4-1

4.1 Introduction 4-1

4.2 System Controller Patchfield 4-2

4.3 Dual LIU Patchfield 4-3

4.3.1 Cross-connect Bits 4-3

4.4 Examples of Management Patchfields 4-4

5 Multiplexer Configuration 5-1

5.1 Menu Tree 5-1

5.1.1 Menu Operation 5-1

5.1.2 Root Menu 5-2

5.1.3 Time Menu 5-2

5.1.4 Mode Menu 5-2

5.1.5 Configuration Menu 5-3

5.2 Time Menu 5-4

5.2.1 Time and Date Setting 5-4

5.2.2 Time and Date Display 5-4

5.2.3 Timed Events 5-4

X723-300151 0-7 Issue 2

5.3 System Mode Menu 5-7

5.3.1 Brief and Verbose Mode Selection 5-7

5.3.2 Echo and Noecho Selection 5-7

5.3.3 Control Terminal Configuration 5-7

5.3.4 Install Menu. E

2

PROM Programming 5-8

5.3.5 Security Password Modification 5-12

5.4 Configuration Menu 5-13

5.4.1 Checking and Running Channel Configurations 5-13

5.4.2 Editing and Displaying Channel Configurations 5-13

5.4.3 DLIU Integrated Menu 5-14

5.4.4 Sync Source 5-21

5.4.5 Alarm Events, Route Alarms and
External Control Relays 5-22

5.4.6 Circuit Assignments 5-25

5.4.7 Circuit Controls 5-26

5.4.8 Smart Configurations 5-27

5.4.9 Fixed Code Table 5-27

5.4.10 Cross-connection Configuration 5-29

5.4.11 Fixed Data Assignment 5-33

5.4.12 Multipoint Timeslot Assignment 5-33

5.4.13 Cross-connect Broadcast Display 5-34

5.4.14 Edit Buffer 'Origin' Display 5-34

5.4.15 Checking and Running Management
Configurations 5-34

5.4.16 Management Configuration Linking 5-35

5.4.17 Equipment Map Editing 5-35

5.4.18 Default Configuration 5-37

5.5 Remote Menu 5-40

5.5.1 Operation (Non-Network Mode) 5-40

5.5.2 Operation (Networking Mode) 5-40

5.6 Smart Menu 5-41

6 Fault Reporting and Maintenance Facilities 6-1

6.1 Fault Reporting 6-1

6.1.1 Fault Logging Modes 6-2

6.1.2 Fault Store Listing and Clearance 6-2

6.1.3 Displaying Active Faults 6-2

6.1.4 Inhibiting Circuit Alarms 6-2

6.1.5 Received Attention 6-3

6.1.6 Fault Tables and Alarm Responses 6-5

X723-300151 0-8 Issue 2

6.1.7 Statistical Reports 6-9

6.2 Maintenance Facilities 6-11

6.2.1 Current Status Monitoring 6-12

6.2.2 Setting Data and Signalling 6-13

6.2.3 Displaying Data, Signalling and Peak Codes 6-14

6.2.4 Loops - Setting and Clearing 6-14

6.2.5 Running Self Test 6-17

6.2.6 Alarm Relay Setting and Clearing 6-18

6.2.7 System LED Test 6-18

6.2.8 Equipment Type and Version Display 6-19

6.2.9 Manual A/B Switching 6-19

6.3 Network Problems 6-20

6.4 Built-in Test Facilities 6-21

6.5 NCS Fault Levels 6-23

7 Channel Interface Cards 7-1

7.1 General Information 7-2

7.2 Approvals 7-3

7.3 Interface Card Reference Numbers 7-3

8 3000 Power Supply Equipment 8-1

8.1 General Description 8-1

8.2 Mechanical Layout 8-1

8.3 Specifications 8-3

8.4 Power Wiring 8-5

8.5 Commissioning 8-7

8.6 Maintenance 8-8

Appendix A Patchfield Electrical Diagrams A-1

A.1 General Information A-1

System Controller Patchfield DT990C A-2
Dual LIU Patchfield DT995D A-6

X723-300151 0-9 Issue 2

Figures

1-1 Typical System Block Diagram 1-4
1-2 Typical Multipoint Configuration 1-11
1-3 Front View of the 3200 Chassis (Typical Configuration) 1-14
1-4 Rear View of the 3200 Chassis 1-15

2-1 External Ringing Supply Connections 2-9
2-2 Ringing Voltage Backplane Links 2-10

4-1 Management Patching Block Diagram 4-7
4-2 Network Management Patchfield Example 4-10
4-3 Local/Remote Patchfield Example 4-10

5-1 Timeslot Check Diagram for Nx64k Operation 5-32

6-1 Position of Loops and Data Test Points 6-17

8-1 Front view of the 3000 Power Supply Shelf 8-2
8-2 Rear view of the 3000 Power Supply Shelf 8-2

Tables

2-1 Alarm Connector Pin Connections 2-6
2-2 Network Port Pin Connections 2-8
2-3 Local Port Pin Connections 2-8
2-4 Ringing Voltage Isolation Links 2-10
2-5 System Controller SW1 Switch Settings 2-11
2-6 Local Port Baud Rate Switch Settings 2-11

4-1 System Controller Patchfield DT990C 4-8
4-2 Dual LIU Patchfield DT995D 4-9

X723-300151 0-10 Issue 2

X723-300151 1-1 Issue 2

1 Equipment Detail

1.1 General Description

This manual applies to 3200 units fitted with operating firmware DT981/6.
The 3200 multiplexer is a software controlled multiplexer and switch

providing multiplexing of voice and 64kbit/s data circuits in to 2048kbit/s
or 1544kbit/s PCM streams, and Nx64kbit/s X.21 lines. The unit is
capable of accessing up to four PCM streams via Port 1 and Port 2,
allowing multiplexing of data on to any stream and cross-connection
between streams. The unit may be operated as a 30 channel system in
CAS mode or as a 31 channel transparent system in CCS mode.
Multiplexing and cross-connection is performed on a timeslot basis.
Additional PCM streams can be provided with some restrictions on cross­connectivity due to backplane bandwidth limitations in Port 3 and Port 4.

Automatic re-routing of essential traffic may be accomplished by utilising
the 14 configurations available and the Network Management System.

The 3200 utilises a microprocessor based system control card for data
cross-connection, synchronisation, general supervision, and the user
interface. The user interface takes the form of a menu tree presented on a
standard RS-232 port.

Interface connections to the 3200 are by Dual Line Interface Units for
2048kbit/s, T1 Line cards for 1544kbit/s or Dual Nx64kbit/s cards for
aggregate PCM lines, and by a range of channel interface cards for voice
and data circuits. Information on all interface cards is contained in
separate manuals for each card. Some channel cards are also
microprocessor based and have a user interface which is presented via the
system control card. Such cards are called 'Smart' channel cards, and the
user gains access to these through a 'Smart' interface option provided by
the system control card.

The 2048kbit/s PCM line signal interfaces to a Dual LIU in the 3200. This
card can operate as either a Smart channel card when fitted in Port 3 or
Port 4, or integrate with the system control card to present one user

X723-300151 1-2 Issue 2

interface when fitted in Port 1 or Port 2. (A separate manual contains
information on the Dual LIU operating as a Smart card.)

The Dual LIU works in conjunction with a G.703 I/O (75R or 120R)
adaptor to provide interfaces to two G.703/G.704 line signals with optional
bypass facilities. A G.703 synchronisation port is also provided.

The G.703 I/O adaptors used with the Dual LIU provide the option of
supporting a PCM and clock bypass. This is used to link the two line
signals in the event of a power failure or a fault in the 3200.

The 3200 chassis may be equipped with up to fifteen channel cards,
however two of these positions are generally used for Dual LIUs.

Channel cards are used to interface to 64kbit/s data circuits or voice
circuits. A variety of channel cards are available including 2/4 wire voice
cards V.11, V.35, X.21, Nx64k and RS-232 interfaces. Each channel card
circuit can be assigned to any timeslot, and cross-connected to any other
timeslot. Additional PCM interface cards are available for the connection
of tributary PCM streams. All channel cards for the 3200 are fully
interchangeable with other Series 3000 products and Series 2000 with a
few operation restrictions in some cases.

The 3200 is divided into four sections called ports 1, 2, 3 and 4. Each port
can be cross-connected to any other port. Ports 1 and 2 each have one
physical card slot, and 3 x 32 timeslot backplane busses allocated to them.
In Port 1 these backplane streams are referred to as P1, S1 and S2 for
configuration purposes. In Port 2 these backplane streams are referred to
as P2, S3 and S4 for configuration purposes. When a Dual LIU or Dual
Nx64Kbit/s card is inserted in to Port 1 or Port 2, they automatically use
S1, S2 or S3, S4 busses in Port 1 and 2 respectively. This allows access for
cross-connection on the system controller of all 4 x 31 timeslots of 4 x
2Mbit/s PCM stream when a Dual LIU is fitted in Port 1 and 2 for
example. When standard channel cards are fitted in Port 1 and Port 2,
they automatically use P1 or P2 busses in Port 1 and Port 2 respectively.
In this case, they have 32 timeslots available for cross connection at the
system controller.

Port 3 has seven physical card slots in a 3200. Port 3 has 1 x 32 timeslot
backplane bus allocated to it which is referred to as P3 for configuration
purposes.

Port 4 has six physical card slots. Port 4 in all chassis has 1 x 32 timeslot
backplane bus allocated to it which is referred to as P4 for configuration
purposes.

X723-300151 1-3 Issue 2

A typical system block diagram is shown in Figure 1-1. If further PCM
line interfaces are required, it is possible to fit Dual LIU cards in Ports 3
and 4, with the restriction of 31 timeslot access in each port.

The 3200 chassis can also incorporate up to four 2048kbit/s G.703 to
optical fibre conversion modules. Details of these modules can be found in
the relevant Technical manual for the FOLD.

A Series 3000 multiplexer power supply unit is required to power the 3200
chassis. This is described in Chapter 8 of this manual.

X723-300151 1-4 Issue 2

7 CHAN CARD SLOTS

PORT 3

32

Timeslots

P3

CROSS

CONNECT

SWITCH

D
U
A
L

L
I
U

S1

P1

S2

PCM 1

PCM 2

D
U
A
L

L
I
U

S3

P2

S4

PORT 2

PCM 1

PCM 2

P4

6 CHAN CARD SLOTS

PORT 4

32

Timeslots

SIG

SIG

PORT 1

A B C D E F

G

A B C D E F

Figure 1-1 Typical System Block Diagram

X723-300151 1-5 Issue 2

1.2 3200 Facilities

1.2.1 Control of the 3200

The system controller supports an RS-232 port for connection to a
standard ASCII VT100 VDU. This is used for local control and
maintenance purposes. Password protection can be used with this port for
increased security.

Two or more multiplexers may be operated in Local/Remote mode where
control of all multiplexers may be carried out from a VDU connected to one
3200, this is termed the 'local unit'. Control of the 'remote unit' is usually
via spare bit capacity in TS0 or by V.28 connections and a suitable data
link between the two units.

The Network Control System (NCS) may be used to control up to 500
nodes in a network, and also provides node to node control and messaging
facilities.

The system control card supports non-volatile battery backed RAM and a
Real Time Clock, with a retention time of approximately 2 weeks for
storage of cross-connect mappings, fault logs etc. In addition an E

2

PROM
is used for long term storage of the multiplexer ‘Mode Instal’ setting. Note
that if the Firmware level is changed, the contents of the RAM may be
lost.

1.2.2 Control Terminal Operating Modes

The 3200 may be set to operate with a wide range of RS-232 terminals e.g.
Wyse 50 compatible VDUs, Teletypes, Personal Computers etc. A Brief
and Verbose operating mode is available.

A menu tree is used to control the set-up and configuration of the
equipment which is normally used in verbose mode displaying all text. In
brief mode, all menus operate normally except for the text output which is
restricted to prompts, and fault numbers during fault reporting. Brief
mode is provided for factory test purposes, or fast access by experienced
users using pre-prepared configuration scripts controlling a
communication package running on a Personal Computer for example.

An 'Install' set-up facility is provided to configure the equipment to suit
each installation. This contains items such as the 'power-on' default
settings, whether the NCS is to be used and other operational parameters.

X723-300151 1-6 Issue 2

1.2.3 Configuration

1.2.3.1 Configuration Fields

The 3200 supports Channel, Smart and Management configurations.
Channel configurations cover the set-up of all the channel cards, the Dual

LIUs when fitted in Ports 1 and 2, synchronisation plus the cross-connect
mappings on the system controller.

There are 14 channel configurations which are stored in non-volatile RAM
and edited in an edit buffer. A default configuration is programmed into
the software to ensure a valid fall back configuration is always available.
Any one of the 14 configurations may be selected and run.

Smart configurations are used by smart channel cards to store their
configuration data. This data is produced by the smart card but stored in
the system controller's non volatile RAM. Each smart card can generate 2
or 4 smart configurations. For each channel configuration a smart card
can be instructed to run any one of its configurations.

Management configurations are used to control the routing of the Network
Management data across PCM TS0 not frame word, and to the system
controllers V.28 network ports and management UARTS.

Fourteen management configurations are provided, each can select
different routing options for management data from the PCM TS0 not
frame word on the Dual LIU or V.28 ports on the system controller. A
management bus is used to allow all the cards in the system to exchange
management data. The management routing is controlled by a series of
pre-programmed patchfields on the system controller and Dual LIU, which
may be selected to provide the required configuration.

1.2.3.2 Equipment Map

A feature of the 3200 is the 'Equipment map'. This is provided to allow the
equipment to register which channel cards are fitted. In addition, the
equipment map is used to raise an alarm if a mapped channel card is
removed or replaced with an incompatible card. Channel Cards which are
not mapped in have fault reporting suppressed by the system controller
but will still function.

X723-300151 1-7 Issue 2

1.2.3.3 Dual LIU Configuration Options

When fitted in port 1 or 2, the Dual LIU is configured from the channel
configuration options.

The following are selectable for each PCM line:
Multipoint mode: when selected, timeslots are connected directly

between the 2 line interfaces on the dual LIU,
by-passing the cross-connection of the system
controller. This can be useful in minimising
delays in a network. Individually selected
timeslots from either line may be
dropped/inserted to the cross connect switch in
either duplex or multipoint.

Terminal mode: when selected provides two independent PCM

trunks to the cross connect switch.

A/B mode: when selected provides a route protection

scheme for the line signal.

Signalling mode: this selects Channel Associated Signalling

(CAS), or 31 timeslot mode transparent to
Common Channel Signalling (CCS).

Fault logging: unused lines may have their alarms inhibited to

avoid unnecessary fault logging. When
inhibited the fault responses to the line (remote
frame and multiframe alarm bits) will not be
affected.

TS0 routing: it is possible to route the spare bits in TS0

either to the management patchfield or to the
cross-connect switch to provide management
routing and Remote alarm bit routing.

PCM Bypass: this allows the Dual LIU to be taken out of

service by activating the bypass relays on the
I/O adaptor. This facility may be used where a
standby LIU is fitted but not in service.

CRC4: Provides error performance monitoring using

CRC4. It may be enabled or disabled.

Low error rate threshold: this allows thresholds of 1 in 10

-4

, 1 in 10-5, or 1

in 10

-6

to be used to raise an alarm. Note that

X723-300151 1-8 Issue 2

this does not affect the detection of 1 in 10

-3

error rate required for line service monitoring.

1.2.3.4 Synchronisation Options

The Series 3000 can be synchronised to a 2MHz or two 8KHz, known as
8k1 and 8k2, internal clock busses which are generated by certain channel
cards by recovering a phase locked clock from external interfaces. Access
to the 2MHz clock bus is fully controlled by the system controller.
However, access to the 8KHz busses are not. This is controlled by link
selection on the channel cards. Thus, care should be taken to ensure only
one channel card is connected to each of the 8KHz clock busses at any one
time. The Dual LIU supports the 2MHz clock bus which allows the
multiplexer to be synchronised to a PCM stream or external G.703 clock.

A prioritised list may be set up to give a primary sync source plus 4
fallback sources. The lowest priority source is always the internal free-run
oscillator. All clock sources are checked for frequency, and internal timers
may be invoked to avoid spurious switching between intermittent sources.
Sync sources from the PCM line signal recovered timing are also qualified
against various line signal fail options.

Note: A PCM line signal should not normally be used as the sync source if
it has its fault logging inhibited since failure of the line will not be
reported.

1.2.3.5 Alarm Event Options

An 'Alarm Event' may be used to trigger a change of configuration in
response to failure of either the incoming data paths or to a failed channel
card. These are used to provide automatic re-routing of services affected
by any failures.

For each multiplexer configuration each alarm event source can be
programmed to run a different multiplexer configuration, in the event of
failure, allowing recovery plans to be set-up for multiple failures.

1.2.3.6 Configuring Channel Cards

Channel cards in each port are identified by a letter e.g. P1A, (Port 1 card
A), P3G (Port 3 card G). Each channel card can support up to four
independent circuits numbered 1 to 4 e.g. P4D2 (Port 4 card D circuit 2).
Some channel cards can provide eight circuits and circuit allocation is
described in the relevant Equipment Manual.

X723-300151 1-9 Issue 2

Cards with only 1 circuit will only support circuit 1, and dual cards will
only support circuits 1 and 2.

1.2.3.7 Timeslot Assignment

Each channel card circuit may be assigned a timeslot(s) from the 32
available in each port stream (P1, 2, 3 and 4).

Each port stream timeslot has associated with it a 'TS control' byte, which
is used to control the gain of the A-D D-A converters on VF channel cards
for setting the analogue interface levels. It is not used on data cards.

Timeslot assignment is not required for a Dual LIU in ports 1 or 2. The
Dual LIU automatically connects line 1 timeslots to S1(3) timeslots, and
line 2 timeslots to S2(4) on a fixed one-to-one basis, i.e. line timeslot 1, 2,

3,......31 to S bus timeslots 1, 2, 3,......31.

1.2.3.8 Circuit Controls

Each channel card circuit supports two 8 bit control ports. These are used
to control operating modes, data rates and loops etc. The settings of these
control ports will vary from card to card.

1.2.3.9 Smart Configurations

Smart cards support 2 or 4 configurations. The channel configuration
maps which configuration any individual smart card will run for each of
the 3200 configurations.

1.2.3.10 Fixed Codes

Fixed codes are used when cross-connection of data and signalling is not
required or not possible e.g. due to line failures etc.

A table of 16 combinations of user programmable fixed data and signalling
codes is maintained. Each source timeslot may call up any one of these
codes to be used to replace its data and associated signalling.

1.2.3.11 Cross Connect Assignments

The cross-connect path may be set up for each outgoing timeslot from the
cross connect block on the system controller. Note all backplane data
streams are terminated or sourced from the cross connnect block on the
system controller. In each case the source stream/port, timeslot, mode,
and fixed code is defined. Alternatively a fixed data mode may be used
without any cross-connections.

X723-300151 1-10 Issue 2

Cross-connection modes supported are:
Simplex: for uni-directional and broadcast data.
Duplex: for bi-directional data.
Multipoint: for point to multipoint services.
To 'undo' a cross-connection it is necessary to allocate fixed data to the

outgoing timeslot. If the connection was in duplex it is necessary to
individually allocate fixed data to each outgoing timeslot, this is because a
duplex connection, for example P3, TS 1 to P4, TS2 sets up 2 simplex
connections for the two outgoing timeslots, P3 TS1 to P4, TS2 and P4 TS2
to P3 TS1.

Multipoint allows timeslots from Port 3 (P3) to be 'AND'ed together with
incoming data from any backplane stream, the result is then inserted into
the outgoing backplane stream. This allows timeslots, hence circuits that
support Multipointing, to be cascaded together such that all of them can
insert and drop data from one timeslot. The end of the chain is referred to
as the master and is connected to many slave cards. The master usually
broadcasts data to all slaves. For correct operation, only one slave may be
active i.e. inserting data at a time. While inactive, the slave should insert
'all ones' towards the ‘AND’ gate, thereby allowing data from the active
slave to pass through.

Currently, multipoint cards exist for X.21, Dual V.24 and 2/4 wire voice
circuits. For multipointing to operate a channel card must

NOT be fitted in

port 1; it may be fitted with a Dual LIU or left empty.
Programmable fixed codes are not available for multipoint mode. In these

cases an 'all ones' data pattern will be generated under fault conditions in
each timeslot affected.

X723-300151 1-11 Issue 2

123

TS1

TS

S1

S2

*

* Incomin

g

timeslot broadcasts

to all source timeslots.

PORT 4

&

&

&

TS1

S3

To/From

Master

Slave(s)

S4

Slave(s)
PORT 3

Figure 1-2 Typical Multipoint Configuration

1.2.4 Fault Reporting

The 3200 has comprehensive fault reporting facilities. All faults are
logged as messages in a fault store (capable of storing the last 64 faults) to
show the fault history, as well as being held in an active faults list to show
current faults.

Fault messages from smart channel cards will also appear in the fault
store, however the smart card also maintains its own active fault list.
Smart channel cards also control the system controller alarm relays.

Fault stores may be accessed locally by the RS-232 port, or remotely with
the NCS.

All faults have associated alarm LED, and relay actions. The alarm relay
responses can be inhibited by the user acknowledging the alarms with
'Receive Attention' facilities.

Smart channel card faults have a separate 'Receive Attention' facility.
Each fault has an associated fault level, which is used by the NCS to

process network faults, and is not available for display at the equipment.

X723-300151 1-12 Issue 2

Fault messages may be displayed directly on the local RS-232 terminal as
the faults occur, or an Alarm Service Request (ASR) mode may be selected.
In ASR mode, fault messages are not automatically displayed, instead an
ASCII BELL character is sent to the terminal every minute until the user
manually requests the new fault messages to be displayed. A printer may
be attached to the terminal to print out the faults as they are displayed.

Fault reporting from channel card circuits may be inhibited with a menu
facility, or by removing the channel card from the equipment map which
will inhibit all fault reporting for that card.

1.2.5 Real Time Clock

The 3200 is equipped with a Real Time Clock. This is used to time and
date stamp fault reports and also to log any messages received from the
NCS.

A timed event facility is provided. This facility allows the 3200 to
automatically change configuration at pre-determined time points,
allowing, for example, voice by day, data by night operation. The time
points may be on a weekly or daily basis over a 365 day period with the
provision to program up to 32 different event changes.

1.2.6 Maintenance Facilities

The 3200 supports comprehensive maintenance facilities as follows:-

Current Configuration and Channel Card Status Display

Each non Smart channel card circuit supports two 8 bit status ports.
These are used to indicate the channel card fault status, card identity code
and set -up. These ports can be useful in identifying the nature of any
active faults.

All configuration parameters may be displayed using the 'Configuration'
menu and in the 'Maintenance' menu, status port values for the channel
cards along with the current sync source and configuration running may
be displayed.

Set and Display Data

Any outgoing timeslot, or its associated signalling, may be set to a user
defined code, and any fixed incoming data or signalling may be displayed
on the local terminal. These are powerful facilities designed to easily test
circuit integrity in conjunction with various loopbacks.

X723-300151 1-13 Issue 2

Display Peak Codes

The data display can only display fixed unchanging data patterns which is
therefore not suitable for checking analogue encoded circuits. A 'Peak
codes' display allows the digital code of an analogue signal, and its
equivalent power level to be displayed for any incoming timeslot.

The circuit must be coded to CCITT G.711 A law for this to operate
correctly.

Loopbacks

Various loopback facilities are provided to aid circuit testing.
Local loops; loop the PCM line signal back to the 3200.
Incoming loops; loop the PCM line signal back to the line.
Timeslot loops; loop individual timeslots back to their source.
Circuit loops; activate loops on data channel cards. Generally these are bi-

directional loops to CCITT. X.150

1.3 Mechanical Description

The 3200 is housed in a 19 inch 6RU chassis assembly. The chassis is
fitted with a front panel which is designed to give protection against
electrostatic discharge and should be fitted at all times when the
equipment is in service. The 3200 requires an external power shelf, the
3000 redundant power supply shelf, which is housed in a 19 inch 3RU
chassis.

No electrical connections are required to the front of the unit during 'in
service' operation. Access is provided to the local V.24 port via a covered
cut out in the front panel. Two windows in the front panel allow viewing
of the equipment status LED indicators of the System Controller(s).

X723-300151 1-14 Issue 2

CHANNEL CARD PORT 4F

CHANNEL CARD PORT 4E

CHANNEL CARD PORT 4D

CHANNEL CARD PORT 4C

CHANNEL CARD PORT 4B

CHANNEL CARD PORT 4A

CHANNEL CARD PORT 3G

CHANNEL CARD PORT3F

CHANNEL CARD PORT 3E

CHANNEL CARD PORT 3D

CHANNEL CARD PORT 3C

CHANNEL CARD PORT 3B

CHANNEL CARD PORT 3A

DUAL LIU PORT 2

DUAL LIU PORT 1

SYSTEM CONTROL (Main)

SYSTEM CONTROL (Standby)

Figure 1-3 Front View of the 3200 Chassis (Typical Configuration)

X723-300151 1-15 Issue 2

Figure 1-4 Rear View of the 3200 Chassis

X723-300151 1-16 Issue 2

With the front panel removed the chassis provides for the mounting of up
to 17 printed circuit boards. The extreme two left hand positions are for
system control cards. These are marked S<SYS (Standby) and
CON>M (Main).

All input/output connections to the channel cards are made via connectors
on the rear of the unit. These connectors are designed to be optionally
fitted with a universal I/O adaptor (DT280) or DIN 41612 connectors (See
Section 2.2.6).

Up to 15 channel cards may be fitted in the positions marked P1, P2, P3A
to P3G and P4A to P4F. The rear of the unit provides for the fitting of
modules on the lower half of the chassis by removing blank panels. Four
positions are dedicated for the use of fibre optic line driver modules.

Front and rear views of the equipment are shown in Figures 1-3 and 1-4
respectively.

Power is supplied to the chassis via a flying lead and this connects to the
3000 3RU power shelf mounted either above or below the 3200 chassis. A
terminal block is fitted to this panel for the connection of an external
ringing supply (See Section 2.2.9). Two connectors are mounted on the top
right hand rear of the unit. The top connector, a 9 pin D-type, is used for
V.28 Network Management (See Section 2.2.7). The lower connector, a 37
pin D-type, is used for Alarm inputs Control outputs and Alarm relay
contacts (See Section 2.2.4).

1.4 Specifications

1.4.1 Common Equipment

Complies with the relevant sections of:
CCITT G.703, G.704, G.706, G.732, G.736, G.823 (Blue Book).

BS6527 1988 Class A ) (Emissions)
EN55022 ) " "
IEC801 Part 2 Level 3 ESD (8kV)
IEC801 Part 3 Level 3 narrow-band susceptibility (10V/m)
IEC801 Part 2 Level 2 electrical fast transients/bursts (1KVAC Power,

0.5kVDC Power Signal and Control)

Note: I/O adaptors DT280 plus I/O blanking panels must be used for
EMC compliance.

X723-300151 1-17 Issue 2

1.4.2 Dual LIU Line Signal Characteristics

Line Rate: 2048kbit/s
Stability: ±25ppm over 5 years when free running
Line Code: HDB3
Transmit Signal Level: ±2.37V ±10% (75 ohms)

±3V ±10% (120 ohms)
Receive Signal Level: 0 to > 6dB line loss
Line Interface: 75 ohms unbalanced: BNC Coaxial

120 ohms balanced: 9 way 'D' Type connector

Jitter Transfer

When a Dual LIU (DTE241) recovered 2048 kHz timing signal is selected
as the system timing source, the jitter transfer from input to output does
not exceed the following limits:

20 dB/Decade

Jitter
Gain
(dB)

0

-25

5 10

178

100k

Frequency (Hz)

Power Consumption

The unit is powered by the 3000 power supply shelf mounted external to
the 3200 chassis. See Chapter 8 of this manual for full details.

One System Controller with one Power Supply Unit. 30 Watts
Two System Controllers with one Power Supply Unit. 36 Watts
One System Controller with two Power Supply Units. 51 Watts
Two System Controllers with two Power Supply Units. 57 Watts

Plus the power consumption of the Dual LIU cards and other channel
cards fitted (See relevant card manuals).

Alarms: 37-way D-Type plug

Alarm Outputs
Prompt: Isolated changeover relay contacts

X723-300151 1-18 Issue 2

Service: Isolated changeover relay contacts
System: Isolated changeover relay contacts

Alarm contact rating 1A @ 50VDC (Resistive) 50VA
External Status Inputs:
5 external status inputs are provided:

Characteristics:
General purpose inputs
Active: -60VDC < input voltage < 0.8VDC (Generally 0V)

Inactive: 1VDC < input voltage < 5VDC or open circuit
The external equipment must be capable of sinking 0.25mA when applying

0V, and 63mA when applying -60VDC.
External Control Relays

4 Relays are available for the control of external equipment. These
provide isolated changeover contacts:

Contact rating: 0.4A @ 125VAC

2A @ 30VDC

External Ringing Supply:

Frequency 17-50Hz
Ringing Voltage 50-150VAC RMS with station DC supply offset (-48V)
Ringer Start O/P Open collector WRT - station supply (-48V)

Max current = 50mA

NOTE: Any external ringing supply connected to the equipment must
conform to BS6301.

Local Port:

V.24, RS-232 (9 pin D-type connector)
(No handshaking)

X723-300151 1-19 Issue 2

Network Port:

Four V.28 inputs (9 pin D-type connector)
Four V.28 outputs

Gain

The gain through the system to or from the channel interface backplane
connector for a channel containing a voice encoded signal is fixed at 1.
Refer to the relevant VF channel card manual for gain contributions
attributable to the channel card.

Quantisation Distortion

The quantisation distortion through the system to or from the channel
interface backplane connector for a channel containing a voice encoded
signal is 0 qdu. Refer to the relevant VF channel card manual for the
quantisation distortion attributable to the channel card.

X723-300151 1-20 Issue 2

Delay

The delay through the system may be calculated from the following
diagram:-

Min 12 µs
Typ 98 µs

Max 184 µs

INPUT LINE INTERFACE

CROSSPOINT

MT 8980

Min 8 µs
Typ 125 µs
Max 133 µs

CROSSPOINT

MT 8980

CROSSPOINT

MT 8980

Port 3/4

Only

Port 3/4

Only

CODEC

MT 8965

270 µs

MT 8965

CODEC

210 µs

CHANNEL
CARD

DTE 90/91

SYSTEM
CONTROLLER

DUAL LIU

2048 kbit/s 2048 kbit/s

OUTPUT LINE INTERFACE

9 µs

DTE241

For delays attributable to
other line interface cards
see relevant technical manual

Backplane
Interface

VF input VF Output

Channel card shown is for example only. Refer to the relevant channel interface card manual for delays
attributable to other VF cards and data interfaces.

Mechanical:

Height 266mm
Width 485mm
Depth 385mm
Weight Max 20kg (Fully loaded)