Nortel Networks 311 ユーザーズマニュアル
Configuration
705
Balance network for loop lengths (Note 2)
Trunk types
Terminating
impedance
(Note 1)
impedance
(Note 1)
0–915 m
(0–3000 ft)
(0–3000 ft)
915–1524 m
(3000–5000 ft)
(3000–5000 ft)
> 1524 m
(> 5000 ft)
(> 5000 ft)
RAN: continuous
operation mode
operation mode
600 or 900
ohms
ohms
600 or 900 ohms
N/A
N/A
Paging
600 ohms
600 ohms
N/A
N/A
Note: The terminating impedance of each trunk unit is software selectable in LD 14 and should
match the nominal impedance of the connecting equipment.
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).
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 loop resistance and loss
Cable loop resistance (ohms)
Cable loop loss (dB)
(nonloaded at 1kHz)
(nonloaded at 1kHz)
Cable length
22 AWG
24 AWG
26 AWG
22 AWG
24 AWG
26 AWG
915 m (3000 ft)
97
155
251
0.9
1.2
1.5
1524 m (5000 ft)
162
260
417
1.6
2.0
2.5
2225 m (7300 ft)
236
378
609
2.3
3.0
3.7
3566 m (11700 ft)
379
607
977
3.7
4.8
6.0
5639 m (18500 ft)
600
960
1544
5.9
7.6
9.4
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):
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):
•
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).
basis of the port type selected in LD 16; only the port type is set by the
user (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).
service assigned in LD 14. Transmission properties can be Via Net Loss
(VNL) or non-Via Net Loss (non-VNL).
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
01.04
Standard
Release 5.0
23 May 2008
Copyright © 2003-2008, Nortel Networks
.