Technical information

Installation
21
Installation
Fiber
Interface
Module
Interfaces control node
with DSU and peripheral
nodes.
1 Maximum Permitted Loss in
Fiber:
6 dB, using 62.5/125 µm optical
cable with a numerical aperture
of 0.275 inches.
Maximum Length:
Approximately 1 km (0 to 5 km
based on the sum of the cable
loss and connector and/or splice
losses. Total loss cannot exceed
6 dB.).
LS/GS trunk
card
Ground start CO trunks
Loop start CO trunks
8 not applicable
ONS and
ONS
CLASS/CLIP
Line Card
DTMF (2500) telephones
Rotary (500) telephones
Night bells
16 External loop resistance:
600 ohms
External wire resistance:
400 ohms
External loop length:
22 AWG (23 IWG) - 3800 m
(12350 ft.)
26 AWG (27 IWG) - 1500 m
(4875 ft.)
OPS Line
Card
DTMF (2500) telephones
Rotary (500) telephones
8 External loop resistance:
1800 ohms
External wire resistance:
1600 ohms
External loop length:
22 AWG (22 IWG) - 15240 m
(50000 ft.)
26 AWG (27 IWG) - 5853 m
(19200 ft.)
Table 2: Peripheral Interface Cards (Cont’d)
Card Devices Supported Circuits Maximum Loop
Resistance/LoopLengths
(Sheet 2 of 2)