Nortel Networks Circuit Card 311 User Manual
Page 680
680
NT8D14 Universal Trunk card
Characteristic
CO/FX/WATS
trunks
DID or tie
trunks
RAN
trunks
Paging
trunks
DC signaling loop length
(max)
1700-ohms loop with
near-end battery of
–42.75 V
2450-ohms loop with
near-end battery of
–44 V
600/
900-ohms
loop
600 ohms
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
±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
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
257 "Trunk types - termination impedance and balance network (NT8D14BA, NT8D14BB)" (page
699)
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.
Electrical characteristics of the Universal Trunk Card are listed in
"Universal Trunk Card electrical characteristics" (page 680)
Table 236
Universal Trunk Card electrical characteristics
Characteristic
DID trunk
CO trunk
Terminal impedance
600 or 900 ohms (selected by
software)
600 or 900 ohms (selected by
software)
Signaling range
2450 ohms
1700 ohms
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
01.04
Standard
Release 5.0
23 May 2008
Copyright © 2003-2008, Nortel Networks
.