Nortel Circuit Card 311 Reference page 705

Trunk types
RAN: continuous
operation mode
Paging
Note: The terminating impedance of each trunk unit is software selectable in LD 14 and should
match the nominal impedance of the connecting equipment.
Note: The balance network of each trunk unit is software selectable between resistive 600 or
900 ohms or 3COM and jumper selectable between 3COM and 3CM2. Jumper selection for
3COM/3CM2 restriction does not apply to NT8D14BB (Release 10 and later).
Table 262
Cable loop resistance and loss
Cable length
915 m (3000 ft)
1524 m (5000 ft)
2225 m (7300 ft)
3566 m (11700 ft)
5639 m (18500 ft)
Port-to-port loss configuration
Loss parameters are selected on the NT8D14 Universal Trunk card by a
switchable pad controlled by codec emulation software. For convenience,
the pads settings are called "in" and "out." Pad settings are determined by
the two factors listed below (the first is under direct user control; the second
is controlled indirectly):
•
•
The transmission properties of each trunk are characterized by the class of
service assigned in LD 14. Transmission properties can be Via Net Loss
(VNL) or non-Via Net Loss (non-VNL).
Copyright © 2003-2008, Nortel Networks
.
Terminating
impedance 0–915 m
(Note 1) (0–3000 ft)
600 or 900 600 or 900 ohms
ohms
600 ohms 600 ohms
Cable loop resistance (ohms)
22 AWG 24 AWG
97 155
162 260
236 378
379 607
600 960
Class of Service is assigned in LD 14 (under direct user control).
Port-to-port connection loss is automatically set by software on the
basis of the port type selected in LD 16; only the port type is set by the
user (controlled indirectly).
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Balance network for loop lengths (Note 2)
915–1524 m
(3000–5000 ft)
N/A
N/A
Cable loop loss (dB)
(nonloaded at 1kHz)
26 AWG 22 AWG
251 0.9
417 1.6
609 2.3
977 3.7
1544 5.9
Configuration 705
> 1524 m
(> 5000 ft)
N/A
N/A
24 AWG 26 AWG
1.2 1.5
2.0 2.5
3.0 3.7
4.8 6.0
7.6 9.4