Nortel NT1R20 Description page 313

QPC578 Integrated Services Digital Line Card
(ISDLC)
configuration
jumper blocks 263, 264
software service changes 263
connector pin assignments 261, 262
description 7, 10, 32, 51, 253, 254
electrical specifications 258
environmental specifications 260
faceplate 254, 255
foreign and surge voltage protection 259
functions 256
card interfaces 257
circuit power 257
line interface units 257
multiplex control 257
power requirements 254, 257, 259
shelf requirements 254
QPC659 Dual-Loop Peripheral Buffer Card 17, 23
QPC789 16-port Message Waiting Analog Line
Card
configuration
jumper blocks 276, 277
software service changes 276
connector pin assignments 273, 274, 275
description 265
electrical specifications 270
environmental specifications 272
faceplate 266
foreign and surge voltage protection 272
functions 267
card interfaces 268
codecs 269
message waiting lamp logic 269
multiplex control 269
loop range (ringer limitations) 271
power requirements 271
QPC789 16-port Message Waiting Line Card
description 7, 10
R
related documentation 1
ringer limitations
NT1R20 Off-Premise Station (OPS) Analog
Line Card 62
QPC789 16-port Message Waiting Analog
Line Card 271
S
signaling words 20
SL-1 Network loops 16, 17, 26, 27, 28
SLIC (subscriber line interface circuit) 30, 268, 269
switches 14, 15
T
TCM (time compressed multiplexed) data 20, 26, 32
loop interfaces 33, 202, 203, 257
terminal equipment 5, 6
connecting line cards 14
testing
self-tests by IPE line cards 22
self-tests by NT1R20 OPS card 54
timeslots 20, 24, 26, 27
tip and ring facilities 9, 19, 26, 34
trunk cards 6
TS0 (timeslot zero) 27, 28
V
variable gain filters 30
voice-only communication 9, 10, 26, 253
voltage surge protection 8, 10, 30, 49
grounding 49
NT1R20 Off-Premise Station (OPS) Analog
Line Card 61
NT8D02 Digital Line Card 207
NT8D09 Analog Message Waiting Line Card
223
QPC192 Off-Premise Extension (OPX)
Analog Line Card 235
QPC452 Basic 500/2500 Analog Line Card
247
QPC578 Integrated Services Digital Line Card
(ISDLC) 259
QPC789 16-port Message Waiting Analog
Line Card 272
Page 289 of 290
Line cards