Nortel Meridian 1 Succession 1000 Manual page 159

Table 44
Return loss—in-service attenuation—A-Law (Part 2 of 2)
Connection from 4-wire
VNL tie trunk to:
4-wire non-VNL tie trunk
(terminal balance)
2-wire non-VNL tie trunk
(terminal balance)
CO or FX trunk
(terminal balance)
PBX line
(terminal balance)
Regular line
(terminal balance)
PBX line
(terminal balance)
Note 1: Reference impedance is 600/900 ¾ + 2.16 µF.
Note 2: Reference impedance is 900 ¾ + 2.16 µF.
Note 3: Switchable pads set for nominal loss of 1 dB.
Note 4: Switchable pads set for nominal loss of 3 dB.
Note 5: If facility loss is less than 2 dB or adequate impedance correction is not provided,
nominal loss has to be increased to 3 dB by switching in the 2 dB pad.
Transmission characteristics—A-Law
Circuit termination
600 ¾ + 2.16 µF at
distant PBX
600 ¾ + 2.16þµF at
distant PBX
900 ¾ + 2.16 µF at CO
600 ¾ + 2.16 µF
600 ¾
Set off-hook
Single-
Echo frequency
return loss return loss
> 22 > 15
> 18 > 10
> 18 > 10
> 24 > 18
> 24 > 18
> 12 > 8
Transmission Parameters
Page 159 of 236
Notes
1, 3
1, 5
2, 5
1, 4
1, 4
1, 4