loop length, some typical resistance and loss values for the most common cable lengths are
given in
Table 179: Cable loop resistance and loss
on page 426 for comparison with values
obtained from actual measurements.
Table 178: Trunk types - termination impedance and balance network (NT8D14BA,
NT8D14BB)
Trunk types
Terminating
impedance
(Note 1)
Balance network for loop lengths (Note 2)
0–915 m (0–3000
ft)
915–1524 m
(3000–5000 ft)
> 1524 m (> 5000
ft)
CO/FX/WATS
600 or 900
ohms
600 ohms
3COM
3CM2
2-way TIE (LDR)
600 or 900
ohms
600 ohms
3COM
3CM2
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
Š 600 ohms)
600 or 900
ohms
600 ohms
N/A
3CM2
RAN: continuous
operation mode
600 or 900
hms
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.
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
Cable loop resistance (ohms)
Cable loop loss (dB)
(nonloaded at 1kHz)
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
NT8D14 Universal Trunk card
426 Circuit Card Reference
July 2011
Summary of Contents for 1000 Series
Page 1: ...Circuit Card Reference Nortel Communication Server 1000 7 0 NN43001 311 04 04 July 2011 ...
Page 20: ...20 Circuit Card Reference July 2011 ...
Page 30: ...Introduction 30 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 116: ...Option settings 116 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 143: ...Figure 25 CP PIV card front Physical description Circuit Card Reference July 2011 143 ...
Page 148: ...NT4N39AA CP Pentium IV Card 148 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 287: ...Figure 86 Clock Controller Option 3 Operation Circuit Card Reference July 2011 287 ...
Page 302: ...NT5K21 XMFC MFE card 302 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 346: ...NT6D80 MSDL card 346 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 353: ...Figure 96 NTDK16 DLC Functional description Circuit Card Reference July 2011 353 ...
Page 461: ...Figure 147 Paging trunk operation Applications Circuit Card Reference July 2011 461 ...
Page 462: ...NT8D15 E and M Trunk card 462 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 500: ...NTAK09 1 5 Mb DTI PRI card 500 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 512: ...NTAK10 2 0 Mb DTI card 512 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 534: ...NTAK79 2 0 Mb PRI card 534 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 550: ...NTBK22 MISP card 550 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 560: ...NTBK50 2 0 Mb PRI card 560 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 595: ...Figure 165 MGC block diagram Introduction Circuit Card Reference July 2011 595 ...
Page 662: ...NTRB21 DTI PRI DCH TMDI card 662 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 668: ...NTVQ01xx Media Card 668 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 700: ......