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
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

BIMP
(Notes 1, 4)

600
ohms

3COM

3CM2

600
ohms

3COM

3CM2

Gain treatment
(Note 5)

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

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