Nortel Networks Circuit Card 311 - Manual (Page 145)

Configuring the OPS analog line card 145
Note 3: Loss of untreated (no gain devices) metallic line facility. Upper loss limits correspond to
loop resistance ranges for 26 AWG wire.
Note 4: The following are the default software impedance settings:
Termination Impedance (TIMP):
Balanced Impedance (BIMP):
ONP CLS
600 ohms
600 ohms OPX CLS
600 ohms
3CM2
Note 1: Gain treatment, such as a Voice Frequency Repeater (VFR) is required to limit the actual
OPS loop loss to 4.5 dB, maximum. VFR treatment of metallic loops having untreated loss greater
than 15 dB (equivalent to a maximum signaling range of 2300 ohms on 26 AWG wire) is not
recommended.
Note 2: Jumper strap settings JX.0 and JX.1 apply to all eight units; "X" indicates the unit number, 0
– 7. "Off" indicates that a jumper strap is not installed across both pins on a jumper block. Store
unused straps on the OPS analog line card by installing them on a single jumper. pin.
Before the appropriate balance network can be selected, the loop length
between the near-end and the far-end station must be known. To assist in
determining loop length,
"Port-to-port loss" (page 152) describes some
typical resistance and loss values for the most common cable lengths for
comparison with values obtained from actual measurements.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.