Nortel Networks Circuit Card 311 - Manual (Page 677)

Electrical specifications 677
Table 233
Universal trunk card - trunk interface electrical characteristics
Trunk Types
Characteristic CO / FX / WATS DID / TIE RAN Paging
Terminal impedance 600 or 900 ohms
(Note 1) 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) 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) Continuous,
level, or pulse N/A
DC signaling loop
length (max) 1700-ohm loop with
near-end battery of
–42.75 V 2450-ohm loop
with near-end
battery of –44 V 600/900-ohm
loop 600 ohm
loop
Far-end battery –42 to –52.5 V
(Note 4) –42 to –52.5 V –42 to –52 V N/A
Minimum detected
loop current 20 mA 10 mA 10 mA N/A
Ground potential
difference ±3 V ±3 V ±1 V ±1 V
Low DC loop
resistance during
outpulsing <300 ohms N/A N/A N/A
High DC loop
resistance Ground start
ˇ
S 30k ohms;
loop start
ˇ S 5M ohms
N/A ˇ S N/A N/A
Ring detection 17 to 33 Hz 40 to
120 V rms N/A N/A N/A
Note 1: Selected in software.
Note 2: Selected by jumper strap settings on card. Refer to Table 250 "Jumper strap settings -
factory standard (NT8D14BA, NT8D14BB)" (page 691) , Table 251 "Jumper strap settings - extended
range (NT8D14BA, NT8D14BB, NT8D14BB)" (page 692) , and Table 252 "Trunk types - termination
impedance and balance network (NT8D14BA, NT8D14BB)" (page 692) for details.
Note 3: 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.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.