Nortel Enterprise 1000 Reference Manual
Succession Communication Server for
Enterprise 1000
Circuit Card Reference Guide
Document Number: 553-3023-211
Document Release: Standard 1.00
Date: June 2001
Year Publish FCC TM
Copyright © 2001 Nortel Networks
All Rights Reserved
Printed in Canada
Information is subject to change without notice. Nortel Networks reserves the right to make changes in design
or components as progress in engineering and manufacturing may warrant. This equipment has been tested
and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC rules, and the
radio interference regulations of Industry Canada. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This equipment
generates, uses and can radiate radio frequency energy, and if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user will be required to correct the
interference at their own expense.
Succession Communication Server for Enterprise 1000 is a trademark of Nortel Networks.
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
4
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Revision history
June 2001
Standard, 1.00. This document is issued for Succession Communication
Server for Enterprise 1000 Release 1.00.
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553-3023-211 Standard 1.00 June 2001
Contents
Contents Page 5 of 236
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Succession System Controller card . . . . . . . . . . . 13
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
NTDK20FA Succession System Controller card . . . . . . . . . . . . . . . . . 13
Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
100BaseT IP daughterboards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
NTAK20 clock controller daughterboard . . . . . . . 25
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Clocking modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Faceplate LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Phase difference detector circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Digital phase lock loops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Digital to analog converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
CPU-MUX bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Signal conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Sanity timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
External timing interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Hardware integrity and regulatory environment . . . . . . . . . . . . . . . 33
ITG Line 2.1 NTVQ55AA card . . . . . . . . . . . . . . . . . 35
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
ITG Line 2.1 card description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
ITG Line 2.1 controls, indicators and connectors . . . . . . . . . . . . . . . . 36
Faceplate components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Backplane interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Assembly description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
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ITG Line 2.1 card functional description . . . . . . . . . . . . . . . . . . . . . . . 39
ITGL Gateway functional description . . . . . . . . . . . . . . . . . . . . . . 39
Virtual TNs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Terminal Proxy Server description . . . . . . . . . . . . . . . . . . . . . . . . . 40
Virtual Terminal Manager (VTM) description . . . . . . . . . . . . . . . . 41
Analog Trunk Cards - NT8D14
Universal Trunk Card . . . . . . . . . . . . . . . . . . . . . . . 43
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Card interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Card control functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Loop start operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Ground start operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Direct inward dial operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Two-way, loop dial repeating, tie trunk operation . . . . . . . . . . . . . 63
Senderized operation for DID and two-way loop DR trunks . . . . . 71
Outgoing automatic, incoming dial operation . . . . . . . . . . . . . . . . . 74
Recorded Announcement trunk operation . . . . . . . . . . . . . . . . . . . 79
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Foreign and surge voltage protection . . . . . . . . . . . . . . . . . . . . . . . 85
Environmental specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Connector pin assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Jumper strap settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Service change entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Paging trunk operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Music operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
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NT8D15 E&M Trunk Card . . . . . . . . . . . . . . . . . . . . 97
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Card interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Card control functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Maintenance features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Signaling and call control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Trunk interface electrical characteristics . . . . . . . . . . . . . . . . . . . . . 121
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Environmental specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Foreign and surge voltage protection . . . . . . . . . . . . . . . . . . . . . . . 122
Connector pin assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Jumper settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Software service entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Paging trunk operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
NTAK09 1.5 Mb DTI/PRI card . . . . . . . . . . . . . . . . . 133
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
NTAK09 DTI/PRI power on self-test . . . . . . . . . . . . . . . . . . . . . . . 137
NTAK20 power on self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
NTAK93 self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
DTI/PRI local self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Foreign and surge voltage protection . . . . . . . . . . . . . . . . . . . . . . . 139
Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
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Signaling interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Interconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Digital pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
D-channel interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
DS-1 Carrier interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Clock controller interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Clock rate converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
NTAK10 2.0 Mb DTI card . . . . . . . . . . . . . . . . . . . . 145
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
DS-30X interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Signaling interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Carrier interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Clock controller interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
NTBK50 2.0 Mb PRI card . . . . . . . . . . . . . . . . . . . . 155
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
DS-30X interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Signaling interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Carrier interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Carrier grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
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CEPT transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Slip control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
D-channel support interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Card-LAN interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
NTAK79 2.0 Mb PRI card . . . . . . . . . . . . . . . . . . . . . 167
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
NTAK79 switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
DS-30X interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Signaling interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Carrier interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Carrier grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
CEPT transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Slip control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
D-channel support interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Card-LAN interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Clock controller interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
NTAK93 D-channel handler
interface daughterboard . . . . . . . . . . . . . . . . . . . . . 181
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
Features and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
Faceplate LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
Power consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
Microprocessors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
DMA controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
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Random Access Memory (RAM) . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Read Only Memory (ROM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
LAPD Data Link/Asynchronous Controller . . . . . . . . . . . . . . . . . . 184
Counter/Timer controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Software interface circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
DPNSS/DCHI Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
D-Port – SDTI/PRI interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
NTBK51 Downloadable D-channel Handler
daughterboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
Features and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Microprocessors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Main Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Shared Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
EPROM Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Flash EPROM Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
EEPROM Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Serial Communication Controller . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Sanity Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
Bus Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
Download Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
System Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
Card enabling or application enabling . . . . . . . . . . . . . . . . . . . . . . 191
Card reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
Background audit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
NTRB21 DTI/PRI/DCH TMDI card . . . . . . . . . . . . . . 193
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
553-3023-211 Standard 1.00 June 2001
Contents Page 11 of 236
NTRB21 TMDI card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Foreign and surge voltage protection . . . . . . . . . . . . . . . . . . . . . . . 200
Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Signaling interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Interconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Digital pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
D-channel interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
DS-1 Carrier interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
NTAK20 Clock Controller (CC) daughterboard . . . . . . . . . . . . . . . 204
NTAK02 SDI/DCH card . . . . . . . . . . . . . . . . . . . . . . 207
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
NTAK02 SDI/DCH card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Connecting to the ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Characteristics of the low speed port . . . . . . . . . . . . . . . . . . . . . . . . 211
Characteristics of the high speed port . . . . . . . . . . . . . . . . . . . . . . . 214
Analog line cards . . . . . . . . . . . . . . . . . . . . . . . . . . 215
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
NT1R20 Off-Premise Station Analog Line Card . . . . . . . . . . . . . . . . . 216
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
Self Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
Card interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
Card functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
Incoming calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
Outgoing calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
Off-premise Station application . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
Page 12 of 236 Contents
Other applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223
Transmission considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223
NT1R20 OPS analog line card installation . . . . . . . . . . . . . . . . . . . 226
NT5K02 Flexible Analog Line Card . . . . . . . . . . . . . . . . . . . . . . . . . . 226
NT8D03 Analog Line Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
NT8D09 Analog Message Waiting Line Card . . . . . . . . . . . . . . . . . . 228
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Technical summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
Analog line interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234
Foreign and surge voltage protections . . . . . . . . . . . . . . . . . . . . . . 234
Overload level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234
Supported Applications . . . . . . . . . . . . . . . . . . . . . 235
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24
Page 13 of 236
Succession System Controller card
Contents
This section contains information on the following topics:
NTDK20FA Succession System Controller card . .. . . . . . . . . . . . . . . . 13
Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
100BaseT IP daughterboards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
This chapter describes the NTDK20FA Succession System Controller (SSC)
card used with the Succession Communication Server for Enterprise
(CSE) 1000 system.
NTDK20FA Succession System Controller card
The NTDK20FA Succession System Controller card is used in the
Succession CSE 1000 Call Server and Media Gateway. It controls call
processing, stores system and customer data, and prov ides various 100BaseT
IP interfaces. The NTDK20FA card is the minimum vintage of SSC that can
be used in the Succession CSE 1000 Call Server and Media Gateway. See
Figure 5 on page 20.
The Succession CSE 1000 Call Server supports up to 640 i2000 series
telephones. More than one Call Server can be installed on a network.
The NTDK20FA SSC card is comprised of the following components and
features:
• NTTK13 Flash daughterboard memory, NTAK19 SIMM module
(16 MB) DRAM, and Backup memory
• up to two 100BaseT IP daughterboards
• two PCMCIA sockets
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
Page 14 of 236 Succession System Controller card
• three Serial Data Interface (SDI) ports
• 32 channels of Conferencing (64 if one dual port 100BaseT IP
daughterboard is present, or 96 if two dual port 100BaseT IP
daughterboards are present)
• one 10BaseT port
• 30 channels of Ton e and Digit Switch (TDS) and a combination of eight
Digitone Receivers (DTR) or Extended Tone Detectors (XTD)
• additional tone service ports (four units of M F C/MFE/MFK5/MFK6/
MFR or eight DTR/XTD units)
Memory
The majority of system and customer configured data is both controlled and
stored on the NTDK20FA SSC card’s Flash ROM. An active and backup
copy of customer data is also kept on the Flash ROM.
The NTDK20FA SSC card also retains a copy of customer files in the event
of data loss, in an area called the Backup flash drive. The NTDK20FA SSC
card is equipped with 8 MB of temporary memory space called DRAM.
DRAM func tions much like RAM on a computer system, storing stor es and
processes temporary automated routines and user-programmed commands
while the system is running. The DRAM on the SSC card stores operating
system files, user files, overlay data, patch codes, and the active copy of the
customer database.
The NTDK20FA SSC card’s Flash daughterboard, the NTTK13, performs
most of the system software storage and data processing for the Succession
CSE 1000.
NTTK13 daughterboard
The NTTK13 is a 48 MB daughterboard comprised of Flash ROM and
Primary Flash drive. It is required in the Call Server and Media Gateway.
• The Flash ROM holds 32 MB of ROM memory, comprising operating
system data and overlay programs. Flash ROM is expandable using an
expansion flash daughterboard.
553-3023-211 Standard 1.00 June 2001
Succession System Controller card Page 15 of 236
• The Primary Flash drive contains 16 MB of storage space. Most of the
data storage is allocated to the Primary Flash drive - the main storage
area of customer configured data.
Other system data such as the Secure Storage Area (SSA) also resides in the
Flash drive. The SSA holds data that must survive power interruptions.
The Boot ROM is a 2 MB storage device located on the NTDK20FA SSC
card. The Boot ROM contains the bo ot code, sy stem d ata, patc h data and t he
backup copy of the Primary Flash drive’s customer database.
100BaseT IP daughterboards.
A 100BaseT IP Daughterboard mounted on the NTDK20FA SSC card allows
the connection of the Call Server to a Media Gateway. See Figure 5 on
page 20.
Each daughterboard increases the number of conference chann els by 32. The
maximum number of conference ports is 96. Table 1 on page 18 provides the
ports, cables and connection data on the IP daughterboards.
The NTDK83 (dual-port) 100BaseT IP daughterboard mounts on the
NTDK20FA SSC card in the Call Server. It provides connectivity to two
Media Gateways, and their associated Media Gateway Expansions, located
within 100 m of the Call Server. An optional secon d NTDK83 daughterboard
can be mounted on the NTDK20FA SSC car d in th e C all Server . Adding the
second NTDK83 daughterboard provides support for up to four Media
Gateways and their associated Media Gateway Expansions. See Figure 1 on
page 16.
The NTDK99AA (single-port) daughterboard is mounted on the SSC card in
the Media Gateway to provide connectivity to the Call Server. See Figure 2
on page 16.
Note: Third party media conversion devices can be used to extend the
range of Media Gateways from the Succession CSE 1000 Call Server.
The IMC Networks Ethernet Compatible Media Converter with a
McLIM Tx/Fx-SM/Plus module was tested by Nortel Networks. It
provided acceptable transmission between the Call Server and the Media
Gateway located up to 40 kms apart.
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
Page 16 of 236 Succession System Controller card
Figure 1
NTDK83AA dual-port 100BaseT IP daughterboard
Figure 2
NTDK99A single-port 100BaseT IP daughterboard
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Succession System Controller card Page 17 of 236
Figure 3
Call Server connection to Media Gateways
Call Server connection to Media Gateways
Call Server Media Gateways
Software
Daughterboard
Software
Daughterboard
Dual Port
100BaseT
Daughterboard
Dual Port
100BaseT
Daughterboard
LAN
Single Port
100BaseT
Daughterboard
The Call Server connects to the LAN via
dual port daughterboards.
One 100BaseT connection is required for
each Media Gateway.
Each Media Gateway contains an SSC with
a single port IP daughterboard and a
software daughterboard.
The single port IP daughterboard connects
to the LAN via 100BaseT.
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
553-CSE0001
Page 18 of 236 Succession System Controller card
Call Servers can be connected to Media Gateways in the following ways:
• use 100BaseT to connect to the LAN for voice distribution over a data
network
• use 100BaseT cable if connected point-to-point (directly) to the Media
Gateway. The NTTK34AA crossover cable must be used. Media
Gateways can be located up to 100 meters from the Call Server.
• use Media Conversion devices (third party converters) to convert
100BaseT to fiber for distances from 100 m to 40 km.
See Figure 3 on page 1 7.
Table 1
Expansion Daughterboards
Daughterboard
NTDK99 (used in
Media Gateway)
NTDK83 (used in
Call Server
Number
of ports
one NTDK8305
two
Cable type
100BaseT 2m
extension cable –
provides external
access to the
100BaseT port, and
EMC containment.
Use the supplied
NTTK4AA UTP CAT 5
RJ45 2 m cross-over
cable to connect the
Call Server and Media
Gateway using the
100BaseT
daughterboards.
The NTTK34AA crossover cable must be
used with the
NTDK8305 2 m
extension cable if
connecting point-topoint.
Max. distance between Call
Server and Media Gateways
Media Gateways can be
located up to100 m (328 ft.)
from the Call Server if
connected point-to-point, or
up to 40 km (24 miles) from
the Call Server if a third party
converter is used to convert to
fiber.
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Succession System Controller card Page 19 of 236
EMC grounding clip
For Media Gateways connected with 100BaseT cable, the cable must be
routed though the EMC grounding clip. This ensures electrical contact
between the ground rail and 100BaseT cable for EMC containment.
The NTTK43AA EMC grounding clip is used on the Media Gateway.
Figure 4
EMC Grounding Clip on the Media Gateway
100BaseT cables
secured with a cable tie
100BaseT Cable
EMC Grounding Clip
CAUTION
Use of the EMC grounding clip is required for EMC compliance.
For further information or installation instructio ns, refer to Succession
Communication Server for Enterprise 1000 Planning and Installation Guide
(553-3023-210).
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
Page 20 of 236 Succession System Controller card
Figure 5
NTDK20FA SSC card and Expansion Daughterboard in the Succession CSE 1000 Call Server
Flash ROM Drive
Security Device
PCMCIA Drive
100BaseT Daughterboard
Ports 1 & 3 for first two
Media Gateways
Connector for 2nd
100BaseT Daughterboard.
Ports 2 and 4 for third and
fourth Media Gateways
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Succession System Controller card Page 21 of 236
PCMCIA interface
The NTDK20FA SSC card has a PCMCIA interface through a socket located
on its faceplate. The PCMCIA socket can accommodate a Software Delivery
card used for software upgrading and as backup media.
Security device for the Succession CSE 1000
The SSC card in each Media Gateway must contain a NTDK57DA Security
device which is keyed to match the NTDK57AA Secur ity device on the Call
Server.
This maintains the requirement of a single keycode for each Succession CSE
1000 system. Refer to Figure 5 on page 20 for the location of the device.
The main objectives of this security scheme are to:
• allow the system to operate as a single system when all links are up.
• allow the Media Gateway to continue operating with its existing
configuration in the event of a failure of the Succession CSE 1000 Call
Server, or the failure of the link to the Succession CSE 1000 Call Server
from the Media Gateway.
• prevent users from configuring or using unauthorized TNs or features.
The Media Gateway security device provides the following capabilities for
the Media Gateway:
• System software can be in stalled but no calls can be processed or features
activated until communication with the Succession CSE 1000 Call
Server has been established and a match between the security ID of the
Succession CSE 1000 Call Server and the Media Gateway has been
confirmed.
• System software can be upgraded.
• Local data dump, LD 43 commands, and LD 143 commands are not
permitted.
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
Page 22 of 236 Succession System Controller card
SDI ports
The NTDK20FA SSC card in both the Call Server and the Media Gateways
contains three SDI ports used to connect on-site terminals or remote terminals
through a modem. Table 2 on page 22 shows the port default settings.
Table 2
Default SDI port settings on the NTDK20 SSC card
TTY Port Baud rate
0 Set by a DIP switch 8 1 None MTC/SCH/BUG
1 1200 8 1 None MTC/SCH/BUG
2 1200 8 1 None MTC/SCH/BUG
Data
bits
Stop
bits
Parity Use
Conferencing
Thirty-two conference channels are provid ed by the NTDK20FA SSC car d’s
conference devices. Conference capability can be increased by mounting
expansion daughterboards on the NTDK20FA SSC card. Each dual IP
daughterboard increases the total number of conference channels by 32: the
maximum number of conference ports is 96.
Each conference device provides 32 ports of conferencing capabilities (one
conference participant for each port). A conference call can have three to six
participants. For example, you can have a maximum of six 5-party
conferences for each device, or four 6-party conferences plus two 3-party
conferences. It is not possible to conference between conference devices.
10BaseT port
The Call Server provides one 10BaseT connection to a Local Area Network
(LAN) to interface with Management software applications such as OTM and
CallPilot. The Media Gateway SSC 10BaseT port is disabled by default. To
use the 10BaseT port, the port must be assigned a unique IP address and the
port must be enabled from the Call Server.
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Succession System Controller card Page 23 of 236
The Media Gateway 10BaseT port can run in Normal mode o r Survival mode.
In Normal mode, the Media Gateway does not provide access to maintenance
or alarm management.
External connections to the 10BaseT port are provided by a 15-pin connector
located on the backplanes of the Call Server and Media Gateways.
Media Gateway/Expansion card slot assignment
The Media Gateway and Media Gateway Expansion contain physical card
slots, numbered 1 to 10.When configuring the Succession CSE 100 0 system,
the physical card slot numbers must be transposed to “logical” card slot
numbers. For example, to configure a card ph ysically located in Slot 2 of the
first Media Gateway, use logical Slot 12. To configure a card physically
located in Slot 2 of the second Media Gateway, use logical Slot 22.
See Table 3.
Table 3
Media Gateway and Media Gateway Expansion slot assignments
Media
Gateway
Media
Gateway
Expansion
First
Media Gateway/
Media Gateway
Expansion
Physical
card
slot
Logical
card
slot
Second
Media Gateway/
Media Gateway
Expansion
Physical
card
slot
Logical
card
slot
Third
Media Gateway/
Media Gateway
Expansion
Physical
card
slot
Logical
card
slot
Fourth
Media Gateway/
Media Gateway
Expansion
Physical
card
slot
1 11 1 21 1 31 1 41
2 12 2 22 2 32 2 42
3 13 3 23 3 33 3 43
4
5
6
not supported
not supported
not supported
4
5
6
not supported
not supported
not supported
4
5
6
not supported
not supported
not supported
4
5
6
not supported
not supported
not supported
7 17 7 27 7 37 7 47
8 18 8 28 8 38 8 48
9 19 9 29 9 39 9 49
10 20 10 30 10 40 10 50
Logical
card
slot
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
Page 24 of 236 Succession System Controller card
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34
Page 25 of 236
NTAK20 clock controller daughterboard
Contents
This section contains information on the following topics:
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Clocking modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Faceplate LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Phase difference detector circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Digital phase lock loops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Digital to analog converter . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
CPU-MUX bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Signal conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Sanity timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Microprocessor . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
External timing interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Hardware integrity and regulatory environment . . . . . . . . . . . . . . . . . . 33
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
Page 26 of 236 NTAK20 clock controller daughterboard
Overview
Digital trunking requires synchronized clocking so that a shift in one clock
source results in an equivalent shift in all parts of the network. In the
Succession Communication Server for Enterprise (CSE) 1000 system,
synchronization is accomplished with an NTAK20 clock controller
daughterboard located in each Media Gateway that contains a digital trunk
card.
The NTAK20 clock controller daughterboard mounts directly on the
following cards:
• NTAK09 1.5Mb DTI/PRI
• NTBK50 2.0 Mb PRI
• NTRB21 DTI/PRI/DCH TMDI
The NTAK20 clock controller card can support 1.5 Mb, 2.0 Mb, and 2.56 Mb
clock recovery rates.
IMPORTANT
Each Media Gateway that has a digital trunk must have a
clock controller clocked to an external reference clock.
Note: Clocking slips can occur between Media Gateways that are
clocked from different COs, if the COs are not synchronized. The slips
can cause degraded voice quality.
The clock controller circuitry synchr onizes the Succession CSE 1000 s ystem
to an external reference clock, and generates and distributes the clock to the
system. The Succession CSE 1000 can fun ction either as a slave to an external
clock, or as a clocking master. The NTAK20AD version of the clock
controller meets the AT&T Stratum 3 and Bell Canada Node Category D
specifications. The NTAK20BD version meets CCITT Stratum 4
specifications.
The NTAK20 card performs the following functions:
• phase lock to a reference, generatio n of the 10.24 Mhz system clo ck, and
distribution of the clock to the CPU through the backplane
553-3023-211 Standard 1.00 June 2001
• accepts one primary and one secondary reference
• primary-to-secondary switchover and auto-recovery
• chatter prevention due to repeated switching
• error-burst detection and correction, holdover, and free running
capabilities
• communication with software
• jitter filtering
• use of an algorithm to aid in detecting crystal aging and to qualify
clocking information
Clocking modes
The Succession CSE 1000 supports a single clock controller that can operate
in one of two modes: tracking or non-tracking (also known as free-run).
Tracking mode
In tracking mode, one or more DTI/PRI cards supply a clock reference to the
NTAK20 clock controller daught erboar d. When op erating in t racking mo de,
one DTI/PRI card is defined as the Primary Reference Source (PREF) for
clock synchronization. The other DTI/PRI card is defined as the Secondary
Reference Source (SREF). PREF and SREF are defined in LD 73.
NTAK20 clock controller daughterboard Page 27 of 236
There are two stages to clock controller tracking:
• tracking a reference
• locking on to a reference.
When tracking a reference, the clock controller uses an algorithm to match its
frequency to the frequency of the incoming clock. When the frequencies are
almost matched, the clock controller locks on to the reference. The clock
controller makes small adjustments to its own frequency until both the
incoming and system frequencies correspond.
If the incoming clock reference is stable, the internal clock controller tracks
it, locks on to it, and matches frequencies exactly. Occasionally,
environmental circumstances cause the external or internal clocks to vary.
When this happens, the internal clock controller briefly enters the tracking
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
Page 28 of 236 NTAK20 clock controller daughterboard
stage. The green LED flashes until the clock controller is locked on to the
reference again.
If the incoming reference is unstable, the internal clock controller
continuously tracks, and the LED continuously flashes green. This condition
does not present a problem. It shows that the clock controller is continually
attempting to lock onto the signal. If slips are occurring, it means that there is
a problem with the clock controller or the incoming line.
Free-run (non-tracking)
In free-run mode, the clock controller does not synchronize on any outside
source. Instead, it provides its own internal clock to the system. This mode
can be used when the Succession CSE 1000 is us ed as a m aster clock source
for other sy stems in the ne twork. Free-run mode is undesirable if the
Succession CSE 1000 is intended to be a slave to an external network clo ck.
Free-run mode can occur when both the primary and secondary clock sour ces
are lost due to hardware faults or if invoked using software commands.
Physical description
Faceplate LEDs
Each of the motherboards have five DTI/PRI LEDs and on e clock controller
LED. The clock controller LED is dual-color (red and green). The clock
controller LED states are described in Table 4.
Table 4
Faceplate LEDs
State Definition
On (Red) NTAK20 is equipped and disabled.
On (Green) NTAK20 is equipped, enabled, and is either locked to a reference or is in
Flashing (Green) NTAK20 is equipped and is attempting to lock (tracking mode) to a
Off NTAK20 is not equipped.
553-3023-211 Standard 1.00 June 2001
free run mode.
reference. If the LED flashes continuously over an extended period of time,
check the CC STAT in LD 60. If the CC is tracking this may be an
acceptable state. Check for slips and related clock controller error
conditions. If none exist, then this state is acceptable, and the flashing is
identifying jitter on the reference.
Functional description
The main functional blocks of the NTAK20 architecture include:
• phase difference detector circuit
• digital Phase Locked Loop (PLL)
• clock detection circuit
• digital-to-analog converter
• CPU MUX bus interface
• signal conditioning drivers and buffers
• sanity timer
• microprocessor
• CPU interface
• external timing interface
Phase difference detector circuit
This circuit, under firmware control, allows a phase difference mea surement
to be taken between the reference entering the PLL and the system clock.
NTAK20 clock controller daughterboard Page 29 of 236
The phase difference is used for making frequency measurements, and
evaluating input jitter and PLL performance.
Digital phase lock loops
The main digital PLL enables the clock controller to provide a system clock
to the CPU. This clock is both phase and frequency locked to a known
incoming reference.
The hardware has a locking range of +
for Stratum 4 (CCITT).
A second PLL on the clock controller provides the means for monitoring
another reference. Note that the error signal of this PLL is routed to the ph ase
difference detector circuit so the microprocessor can process it.
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
4.6 ppm for Stratum 3 and + 50 ppm
Page 30 of 236 NTAK20 clock controller daughterboard
System clock specification and characteristics
Since the accuracy requirements for C CITT and EIA Stratum 3 are dif ferent,
it is necessary to have two TCVCXOs which feature different values of
frequency tuning sensitivity.
Table 5
System clock specification and characteristics
Specifications CCITT EIA
Base Frequency 20.48 MHz 20.48 MHz
Accuracy + 3 ppm + 1 ppm
Operating Temperature 0 to 70 C + 1 ppm 0 to 70 C + 1 ppm
Drift Rate (Aging) + 1 ppm per year + 4 ppm in 20 years
Tuning Range (minimum) + 60 ppm min.
90 ppm max.
+
Input Voltage Range 0 to 10 volts, 5V center 0 to 10 volts, 5V center
+ 10 ppm min.
15 ppm max.
+
EIA/CCITT compliance
The clock controller complies with 1.5 Mb EIA Stratum 3ND, 2.0 Mb CCITT
or 2.56 Mb basic rate. The differences between these requirements mainly
affect PLL pull in range. Stratum 4 conforms to international markets (2.0
Mb) while Stratum 3 conforms to North American markets (1.5 Mb).
Monitoring references
The primary and secondary synchronization references are continuously
monitored in order to provide autorecovery.
Reference switchover
Switchover occurs in the case of reference degradation or loss of signal.
When performance of the reference degrades to a point where the system
clock is no longer allowed to follow the timing signal, then the reference is
out of specification. If the reference being used is out of specification and the
other reference is still within specification, an automatic switchover is
initiated without software intervention. If both references are out of
specification, the clock controller provides holdover.
553-3023-211 Standard 1.00 June 2001
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