Nortel Circuit Card Installation Manual page 105

Table 14
OPS analog line card configuration (Part 2 of 3)
Application
Class of Service
(CLS) (Note 1)
Loop loss (dB)
(Note 3)
TIMP
(Notes 1, 4)
Note 1: Configured in the Analog (500/2500-type) Telephone Administration program (LD 10).
Note 2: The maximum signaling range supported by the OPS analog line card is 2300 ohms.
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: Default software impedance settings are:
ONP CLS
TIMP: 600 ohms
BIMP: 600 ohms
Note: 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: 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 as shown below:
On-premise station (ONS)
ONP
0–1.5 >1.5–2.5
600 600
ohms ohms
OPX CLS
600 ohms
3COM2
Jumper pin
Jumper block
Off-premise station (OPS)
>2.5–3.0 0–1.5
600 600
ohms ohms
Jumper strap
553-5924
Circuit Card
Option settings Page 105 of 906
OPX
>1.5–2.5 >2.5–4.5
600 600
ohms ohms
Description and Installation
>4.5–15
600
ohms