Table 57 – Nortel Networks 1000 User Manual
Page 134
134
NT1R20 Off-Premise Station Analog Line card
Table 57
OPS analog line card - configuration
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
Loop loss (dB)
(Note 3)
0–1.5
>0–3.0
>2.5–3.0
0–1.5
>1.5–2.5
>2.5–4.5
>4.5–15
TIMP
(Notes 1, 4)
600
ohms
600
ohms
600
ohms
600
ohms
600
ohms
600
ohms
600
ohms
BIMP
(Notes 1, 4)
600
ohms
3COM
3CM2
600
ohms
3COM
3CM2
3CM2
Gain treatment
(Note 5)
No
Yes
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: The following are the default software impedance settings:
Termination Impedance
(TIMP):
Balanced Impedance (BIMP):
ONP CLS
600
ohms
600 oh
ms
OPX CLS
600
ohms
3CM2
Note 1: 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 2: 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.
Before the appropriate balance network can be selected, the loop length
between the near-end and the far-end station must be known. To assist
in determining loop length,
“Port-to-port loss” (page 142)
describes some
typical resistance and loss values for the most common cable lengths for
comparison with values obtained from actual measurements.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.