Nortel Networks Circuit Card 311 - Manual (Page 679)

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
.