Nortel Networks 1000 - Manual (Page 121)

Functional description 121
LD 10 is also used to select unit terminating impedance and balance
network impedance at the TIMP and BIMP prompts, respectively. The
message waiting interrupted dial tone and call forward reminder tone
features are enabled by entering data into the customer data block using
LD 15.
See Software Input/Output Reference — Administration (NN43001-611) for
LD 10 and LD 15 service change instructions.
Table 48
OPS analog line card configuration
Application On-premise station (ONS) Off-premise station (OPS)
Class of
service
ONS OPS
Loop resist
ance
0 - 460 ohm 0 - 2300 ohm
Jumper strap
setting b
Both JX. 0 and JX 1 off Both JX. 0 and JX.
1 off
Both JX. 0 and JX.
1 on
Loop loss dB c 0-1.5 >1.5-2.5 >2.5-3.0 0-1.5 >1.5-2.5 >2.5-4.5 >4.5-15
TIMP 600
ohm
600
ohm
600
ohm
600
ohm
600
ohm
600
ohm
600
ohm
BIMP 600
ohm
3COM 3CM2 600
ohm
3COM 3CM2 3CM2
Gain treatm
ent e
No Yes
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.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.