Nortel Networks 553-3001-211 manual NT8D14 Universal Trunk card Page 609

NT8D14 Universal Trunk card Page 609 of 894

Table 188

Trunk types – termination impedance and balance network (NT8D14BA, NT8D14BB)

	Terminating	Balance network for loop lengths (Note 2)
Trunk types	impedance	0–915 m	915–1524 m	> 1524 m
	(Note 1)	(0–3000 ft)	(3000–5000 ft)	(> 5000 ft)
CO/FX/WATS	600 or 900	600 ohms	3COM	3CM2
	ohms
2-way TIE (LDR)	600 or 900	600 ohms	3COM	3CM2
	ohms
2-way TIE	600 or 900	600 ohms	3COM	3CM2
(OAID)	ohms
DID (loop length	600 or 900	600 ohms	3COM	3CM2
< 600 ohms)	ohms
DID (loop length	600 or 900	600 ohms	N/A	3CM2
Š 600 ohms)	ohms
RAN: continuous	600 or 900	600 or 900 ohms	N/A	N/A
operation mode	ohms
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.

Circuit Card Description and Installation