Nortel Networks Circuit Card - Manual (Page 121)

Option settings Page 121 of 906
Circuit Card Description and Installation
Table 33
NT8D14 vintages BA/BB jumper strap settings—extended range
Trunk types
Loop length
Jumper strap settings
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
level start modes Not applicable: RAN
trunks should not leave
the building. Off Off 2–3 1–2
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 34
NT8D14 vintages BA/BB trunk types—termination impedance and balance network
(Part 1 of 2)
Trunk types
Terminating
impedance
(Note 1)
Balance network for loop lengths (Note 2)
Zero–915 m
(zero–3000 ft)
915–1524 m
(3000–5000 ft)
> 1524 m
(> 5000 ft)
CO/FX/WATS 600 or 900
ohms 600 ohms 3COM1 3COM2
2-way tie (LDR) 600 or 900
ohms 600 ohms 3COM1 3COM2
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.