Nortel Networks 1000 User Manual
Page 616
616
NT8D14 Universal Trunk card
Table 231
Trunk types - termination impedance and balance network (NT8D14BA, NT8D14BB) (cont’d.)
Balance network for loop lengths (Note 2)
Trunk types
Terminating
impedance
(Note 1)
0–915 m
(0–3000 ft)
915–1524 m
(3000–5000 ft)
> 1524 m
(> 5000 ft)
2-way TIE (OAID)
600
or
900
ohms
600 ohms
3COM
3CM2
DID (loop length
< 600 ohms)
600
or
900
ohms
600 ohms
3COM
3CM2
DID (loop length
ˇ
S 600 ohms)
600 or 900
ohms
600 ohms
N/A
3CM2
RAN: continuous
operation mode
600 or 900
ohms
600 or 900 ohms
N/A
N/A
Paging
600 ohms
600 ohms
N/A
N/A
Note 1: The terminating impedance of each trunk unit is software selectable in LD 14 and should
match the nominal impedance of the connecting equipment.
Note 2: 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 232
Cable loop resistance and loss
Cable loop resistance (ohms)
Cable loop loss (dB)
(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
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.