Nortel Networks 553-3001-211 manual 5000 ft, 3COM1 3COM2

			Option settings	Page 119 of 894
Table 32
NT8D14 vintages BA/BB jumper strap settings—extended range
			Jumper strap settings
Trunk types	Loop length
		J1.X	J2.X	J3.X	J4.X
CO/FX/WATS	> 1524 m (5000 ft)	Off	Off	1–2	2–3
2-way tie (LDR)
2-way tie (OAID)
DID	> 600 ohms	On	On	1–2	2–3
RAN: pulse start or	Not applicable: RAN	Off	Off	2–3	1–2
level start modes	trunks should not leave
	the building.

Note: Jumper strap settings J1.X, J2.X, J3.X, and J4.X apply to all eight units; “X” indicates the unit number, 0–7. “Off” indicates that no jumper strap is installed on a jumper block.

Table 33

NT8D14 vintages BA/BB trunk types—termination impedance and balance network (Part 1 of 2)

	Terminating	Balance network for loop lengths (Note 2)
Trunk types	impedance	Zero–915 m	915–1524 m	> 1524 m
	(Note 1)	(zero–3000 ft)	(3000–5000 ft)	(> 5000 ft)
CO/FX/WATS	600 or 900	600 ohms	3COM1	3COM2
	ohms
2-way tie (LDR)	600 or 900	600 ohms	3COM1	3COM2
	ohms

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 is jumper selectable between 3COM1 and 3COM2.

Circuit Card Description and Installation