Nortel Networks 553-3001-211 manual 3COM, Oaid

Page 606 of 894 NT8D14 Universal Trunk card

Table 187

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.

Jumper strap settings

For most applications, the jumper strap settings remain set to the standard configuration as shipped from the factory. See Table 185 on page 604.

The jumper strap settings must be changed, as shown in Table 186 on page 605, for the following:

•For CO/FX/WATS or TIE trunk loops exceeding 1524 meters (5000 ft.)

553-3001-211 Standard 2.00 September 2004