Page428 of 544 NT1R20Off Premise Station (OPS) analog line card
553-3011-100 Standard14.00 January 2002
Port-to-port loss configurationThe loss plan for the OPS analog line card determines port-to-port loss for connections between an OPS analog line card unit (port) and other Meridian 1 PE or IPE ports.The transmission properties of each line unit are characterized by the OPS or ONS class-of-service assigned in the Single-line Telephone Administration program (LD10).Table 1 33
OPS analog line card configuration
Application On-premise station (ONS) Off-premise station (OPS)
Class of service ONS OPS
Loop resistance 0 - 460 ohm 0 - 2300 ohm
Jumper strap set-
tingbBoth JX. 0 and JX 1 off Both JX. 0 and JX.
1 off
Both JX. 0 and JX.
1 on
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 treatment eNo Yes
a. Configured in the Single line Telephone Administration program (LD 10).
b. Jumper strap settings JX 0 and JX. 1 apply t o all eight units; “X” in dicates the unit number, 0-7. “OF F”
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 CLS OPS CLS
TIMP: 600 ohm 600 ohm
BIMP: 600 ohm 3COM2
e. Gain treatment, such as a vo ice frequency repeat er (VFR) is required to li mit the actual OPS loop loss
to 4.5 dB, maximum. VFR t reatment of metalli c loops having untr eated loss greater t han 15dB
(equivalent to a maximum signaling range of 2300 ohm on 26 AWG wire) is not recommended.