Functional description 133
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 blockusing LD 15.
See Software Input/Output Reference — Administration (NN43001-611) for
LD 10 and LD 15 service change instructions.
Tabl e 62
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
settingbBoth JX. 0 and JX 1 off Both JX. 0 and JX.
1 off Both JX. 0 and JX.
1on
Loop loss dBc0-1.5 >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 eNo 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.
Individual line interface units on the OPS analogline card are configured
to either OPS (for OPS application) or ONS (for ONS application) Class of
Service (CLS) in the Single-line TelephoneAdministration program (LD10)
(see Table62 "OPS analog line card configuration" (page 133)). LD10
is also used to select unit terminating impedance and balance network
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23May 2008
Copyright© 2003-2008, Nor tel Networks
.