Nortel Circuit Card Installation Manual page 164

Page 164 of 906
Table 63
OPS analog line card configuration
Application
Class of service
Loop resistance
Jumper strap
b
setting
c
Loop loss dB
TIMP
BIMP
e
Gain treatment
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.
553-3001-211 Standard 3.00
NT1R20 Off-Premise Station Analog Line card
See Software Input/Output: Administration (553-3001-311) for LD 10
service change instructions.
On-premise station (ONS)
ONS
0 - 460 ohm
Both JX. 0 and JX 1 off
0-1.5 >1.5-2.
5
600 600
ohm ohm
600 3COM
ohm
August 2005
Off-premise station (OPS)
Both JX. 0 and JX.
1 off
>2.5-3. 0-1.5
0
600 600
ohm ohm
3CM2 600
ohm
No
OPS
0 - 2300 ohm
Both JX. 0 and JX.
1 on
>1.5-2. >2.5-4.
5 5
600 600
ohm ohm
3COM 3CM2
>4.5-15
600
ohm
3CM2
Yes