Nortel Networks Circuit Card - Manual (Page 174)

Page 174 of 906 NT1R20 Off-Premise Station Analog Line card
553-3001-211 Standard 3.00 August 2005
Configuring the OPS analog line card
The line type, terminating impedance, and balance network configuration for
each unit on the card is selected by software service change entries at the
system terminal and by jumper strap settings on the card.
Jumper strap settings
Each line interface unit on the card is equipped with two jumper blocks that
are used to select the proper loop current depending upon loop length. See
Table 71.
For units connected to loops of 460 to 2300 ohms, both jumper blocks for that
unit must have jumper blocks installed. For loops that are 460 ohms or less,
jumper blocks are not installed. Figure 24 on
page 176 shows the location of
the jumper blocks on the OPS analog line card.
Table 71
OPS analog line card – configuration (Part 1 of 2)
Application On-premise station (ONS) Off-premise station (OPS)
Class of Service
(CLS) (Note 1) ONP OPX
Loop resistance
(ohms) 0–460 0–2300 (Note 2)
Jumper strap
setting (Note 6) Both JX.0 and JX.1
off Both JX.0 and JX.1
off Both JX.0 and JX.1
on
Loop loss (dB)
(Note 3) 0–1.5 >0–3.0 >2.5–3.0 0–1.5 >1.5–2.5 >2.5–4.5 >4.5–15
TIMP
(Notes 1, 4) 600
ohms 600
ohms 600
ohms 600
ohms 600
ohms 600
ohms 600
ohms
BIMP
(Notes 1, 4) 600
ohms 3COM 3CM2 600
ohms 3COM 3CM2 3CM2