
NT8D14 Universal Trunk card
Page 621 of 906
Circuit Card
Description and Installation
Table 193
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
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.
Summary of Contents for Circuit Card
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Page 4: ...Page 4 of 906 Revision history 553 3001 211 Standard 3 00 August 2005...
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