Nortel Networks Circuit Card - Manual (Page 104)

Page 104 of 906 Option settings
553-3001-211 Standard 3.00 August 2005
NT1R20 Off-Premise Station card
Table 14 lists option settings for the NT1R20 Off-Premise Station analog
card.
Table 14
OPS analog line card configuration (Part 1 of 3)
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
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 OPX CLS
TIMP: 600 ohms 600 ohms
BIMP: 600 ohms 3COM2
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:
553-5924
Jumper block
Jumper strap
Jumper pin