Case Communications 3200 User 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
Tel (UK): 08700 263 740 Tel (International): +44 (0) 1494 833 740
Fax (UK): 08700 263 741 Fax (International): +44 (0) 1494 833 741

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 ofCouncil
Directive 89/336/EEC on the approximation of the laws ofthe member states relating toelectromagnetic
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 awarranty of performance of the equipment and/or software described and nospecifications given
form part of any contract. This document does not constitute alicence 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 andassumes no
liability for any loss or damage caused asaresult 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 or 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. E2PROM 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 cross-
connectivity 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 E2PROM
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.
Table of contents
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