Nortel Meridian 1 Option 11C Planning And Installation Manual page 195

Table 24
OPS analog line card configuration
Application
Class of ser-
vice
(Note 1)
Loop resis-
tance
Jumper strap
setting
(Note 6)
Loop loss dB
(Note 3)
TIMP
(Note 1, 4)
BIMP
(Note 1, 4)
Gain treatment
(Note 5)
Note 1: Configured in the Single line 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:
ONS CLSOPS CLS
TIMP: 600 ohms 600 ohms
BIMP: 600 ohms 3COM2
Note 5: 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 ohms on 26 AWG wire) is not recommended.
Note 6: 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)
ONS
0 - 460 ohms
Both JX. 0 and JX.1 off
0-1.5 >1.5-2.5
600¾ 600¾
600¾ 3COM1
Installing the circuit cards Page 195 of 408
Off-premise station (OPS)
Both JX. 0 and
JX. 1 off
2.5-3.0 0-1.5
600¾ 600¾
3COM2 600¾
No
Option 11C
OPS
0 - 2300 ohms
Both JX. 0 and
JX. 1 on
1.5-2.5 2.5-3.0
600¾ 600¾
3COM 3COM
1 2
Planning and Installation Guide
4.5-15
600¾
3COM
2
Yes