Table 260 – Nortel Networks 1000 User Manual
Page 692
692
NT8D15 E and M Trunk card
Table 260
Electrical characteristics of trunk cards
Characteristic
DID Trunk
CO trunk
Nominal impedance
600 or 900 ohms, (selected by
software)
600 or 900 ohms, (selected by
software)
Signaling range
2450 ohms
1700 ohms
Signaling type
Loop
Ground or loop start
Far-end battery
-42 to -52.5 V
-42 to -52.5 V
Near-end battery
N/A
-42.75 to -52.5 V
Minimum loop current
N/A
20 mA
Ground potential difference
+ 10 V
+ 3 V
Low DC loop resistance during
outpulsing
N/A
300 ohms
High DC loop resistance
N/A
Ground start equal to or greater
than 30 kS. Loop start equal to
or greater than 5 MS
Line leakage
Equal to or greater than 30 kS
(Tip to Ring, Tip to GND, Ring
to GND).
Equal to or greater than 30 kS
(Tip to Ring, Tip to GND, Ring
to GND)
Effective loss
See pad table
See pad table
Table 261 "Electrical characteristics" (page 692)
lists the electrical
characteristics of the trunk interface on the E and M Trunk card.
Table 261
Electrical characteristics
Characteristic
4-wire trunk
2-wire trunk
Signaling range
Type I
150 ohms
Type II
300 ohms loop
Type I
150 ohms
Signaling type
Type I, Type II
Type I
Far-end battery
–42 to –52.5 V dc
–42 to –52.5 V dc
Near-end battery
–42.75 to –52.5 V dc
–42.75 to –52.5 V dc
Ground potential difference
±10 V dc
±10 V dc
Line leakage between E lead and
ground
ˇ
S20K
1
/
2
³20K
1
/
2
Effective loss
See pad table (
)
See pad table (
)
Terminating impedance
600 ohms
600 ohms
Balance impedance
N/A
600 ohms
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.