Nortel Networks Circuit Card - Manual (Page 164)

Page 164 of 906 NT1R20 Off-Premise Station Analog Line card
553-3001-211 Standard 3.00 August 2005
See Software Input/Output: Administration (553-3001-311) for LD 10
service change instructions.
Table 63
OPS analog line card configuration
Application On-premise station (ONS) Off-premise station (OPS)
Class of service ONS OPS
Loop resistance 0 - 460 ohm 0 - 2300 ohm
Jumper strap
setting
b
Both JX. 0 and JX 1 off Both JX. 0 and JX.
1 off
Both JX. 0 and JX.
1 on
Loop loss dB
c
0-1.5 >1.5-2.
5
>2.5-3.
0
0-1.5 >1.5-2.
5
>2.5-4.
5
>4.5-15
TIMP 600
ohm
600
ohm
600
ohm
600
ohm
600
ohm
600
ohm
600
ohm
BIMP 600
ohm
3COM 3CM2 600
ohm
3COM 3CM2 3CM2
Gain treatment
e
No Yes
a. Configured in the Analog (500/2500-type) Telephone Administration program (LD 10).
b. 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.
c. Loss of untreated (no gain devices) metallic line facility. Upper loss limits correspond to loop
resistance ranges for 26 AWG wire.
d. Default software impedance settings are:
ONS CLSOPS CLS
TIMP:600 ohm600 ohm
BIMP:600 ohm3COM2
e. 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 15dB (equivalent to a maximum signaling range of 2300 ohm on 26 AWG wire) is not
recommended.