Avaya Nortel Communication Server 1000 Reference page 426

NT8D14 Universal Trunk card
loop length, some typical resistance and loss values for the most common cable lengths are
given in Table 179: Cable loop resistance and loss
obtained from actual measurements.
Table 178: Trunk types - termination impedance and balance network (NT8D14BA,
NT8D14BB)
Trunk types
CO/FX/WATS
2-way TIE (LDR)
2-way TIE (OAID) 600 or 900
DID (loop length
< 600 ohms)
DID (loop length
Š 600 ohms)
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.
Table 179: 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.)
426 Circuit Card Reference
Terminating Balance network for loop lengths (Note 2)
impedance
0–915 m (0–3000
(Note 1)
ft)
600 or 900 600 ohms
ohms
600 or 900 600 ohms
ohms
600 ohms
ohms
600 or 900 600 ohms
ohms
600 or 900 600 ohms
ohms
600 or 900 600 or 900 ohms
hms
600 ohms 600 ohms
Cable loop resistance (ohms)
22 AWG 24 AWG
97 155
162 260
236 378
379 607
600 960
Comments? infodev@avaya.com
on page 426 for comparison with values
915–1524 m
(3000–5000 ft)
3COM
3COM
3COM
3COM
N/A
N/A
N/A
Cable loop loss (dB)
(nonloaded at 1kHz)
26 AWG 22 AWG 24 AWG
251 0.9 1.2
417 1.6 2.0
609 2.3 3.0
977 3.7 4.8
1544 5.9 7.6
> 1524 m (> 5000
ft)
3CM2
3CM2
3CM2
3CM2
3CM2
N/A
N/A
26 AWG
1.5
2.5
3.7
6.0
9.4
July 2011