Nt1R20 Off-Premise Station Card - Nortel Circuit Card Installation Manual

Page 104 of 906

NT1R20 Off-Premise Station card

Table 14
OPS analog line card configuration (Part 1 of 3)
Application
Class of Service
(CLS) (Note 1)
Loop resistance
(ohms)
Jumper strap
setting (Note 6)
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:
553-3001-211 Standard 3.00
Option settings
Table 14 lists option settings for the NT1R20 Off-Premise Station analog
card.
On-premise station (ONS)
ONP
0–460
Both JX.0 and JX.1
off
OPX CLS
600 ohms
3COM2
Jumper pin
Jumper block
August 2005
Off-premise station (OPS)
0–2300 (Note 2)
Both JX.0 and JX.1
off
Jumper strap
553-5924
OPX
Both JX.0 and JX.1
on