Nortel Networks Circuit Card 311 - Manual (Page 692)

692 NT8D14 Universal Trunk card
Table 251
Jumper strap settings - extended range (NT8D14BA, NT8D14BB, NT8D14BB)
Jumper strap settings (Note 1)
Trunk types Loop length J1.X J2.X J3.X
J4.X
(Note 2)
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 1: 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.
Note 2: For the NT8D14BB card, J4.X is not provided on the board. The J4.X jumper setting
specified in
Table 251 "Jumper strap settings - extended range (NT8D14BA, NT8D14BB,
NT8D14BB)" (page 692) does not apply.
Table 252
Trunk types - termination impedance and balance network (NT8D14BA, NT8D14BB)
Balance network for loop lengths (Note 2)
Trunk types
Terminating
impedance
(Note 1)
0–915 m
(0–3000 ft)
915–1524 m
(3000–5000 ft)
> 1524 m
(> 5000 ft)
CO/FX/WATS 600 or 900
ohms 600 ohms 3COM 3CM2
2-way TIE (LDR) 600 or 900
ohms 600 ohms 3COM 3CM2
2-way TIE (OAID) 600 or 900
ohms 600 ohms 3COM 3CM2
DID (loop length <
600 ohms) 600 or 900
ohms 600 ohms 3COM 3CM2
DID (loop length ˇ S
600 ohms)
600 or 900
ohms 600 ohms N/A 3CM2
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.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
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