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Electrical specifications 679
Characteristic
CO/FX/WATS
trunks
DID or TIE
trunks
RAN
trunks
Paging
trunks
Ground potential difference ±3 V ±1 V ±1 V
Low DC loop resistance
during outpulsing
<300 ohms N/A N/A N/A
High DC loop
resistance
ˇ
S
ˇ
S
ˇ
S
ˇ
S
Ground start
ˇ
S 30k ohms;
loop start
ˇ
S 5M ohms
N/A N/A N/A
Ring detection 17 to 33 Hz 40 to 120
V rms
N/A N/A N/A
Line leakage ˇ
S 30k ohms, tip-to-ring,
tip-to-ground, ring-to-ground
N/A N/A
AC induction rejection 10 V rms, tip-to-ring,
tip-to-ground, ring-to-ground
N/A N/A
Note 1: Selected in software.
Note 2: Selected by jumper strap settings on card. Refer to Table 255 "Jumper strap settings
- factory standard (NT8D14BA, NT8D14BB)" (page 698), Table 256 "Jumper strap settings -
extended range (NT8D14BA, NT8D14BB, NT8D14BB Release 10 and up)" (page 698), and Table
257 "Trunk types - termination impedance and balance network (NT8D14BA, NT8D14BB)" (page
699) for details.
Note 3: Loop start answer supervision introduced with vintage BA cards and release 19 software.
Note 4: For loop extender application, the maximum voltage applied between tip and ring is -105 V
±5%. The minimum dc loop resistance for this type of application is 1800 ohms.
Table 234 "Universal trunk card - trunk interface electrical characteristics"
(page 678) gives the electrical characteristics of the NT8D14 Universal
Trunk Card.
Table 235
NT8D14 Universal trunk card - trunk interface electrical characteristics
Characteristic
CO/FX/WATS
trunks
DID or tie
trunks
RAN
trunks
Paging
trunks
Terminal impedance 600 or 900 ohms (Note 1) 600/900
ohms
(Note 1)
600 ohms
Balance impedance 600 or 900 ohms (Note 1), 3COM, or 3CM2
(Note 2)
N/A N/A
Supervision type Ground or loop start
(Note 3)
Loop start (with ans
sup) (Note 3)
Continuou
s, level, or
pulse
N/A
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.