Nortel Networks Circuit Card 311 - Manual (Page 94)

94 Option settings
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
2-way tie (LDR)
2-way tie (OAID)
> 1524 m (5000 ft) Off Off 1–2 2–3
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 33
NT8D14 vintages BA/BB trunk types-termination impedance and balance network
Balance network for loop lengths (Note 2)
Trunk types
Terminating
impedance
(Note 1)
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
2-way tie (OAID) 600 or 900 ohms 600 ohms 3COM1 3COM2
DID (loop < 600
ohms) 600 or 900 ohms 600 ohms 3COM1 3COM2
DID (loop ˇ S 600
ohms)
600 or 900 ohms 600 ohms N/A 3COM2
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 is jumper selectable between 3COM1 and 3COM2.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.