Nortel Circuit Card Installation Manual page 653

Table 202
Electrical characteristics of E&M trunk cards (Part 2 of 2)
Characteristic
Effective loss
Terminating impedance
Balance impedance
Table 203
Electrical characteristics of trunk cards
Characteristic
Nominal impedance
Signaling range
Signaling type
Far-end battery
Near-end battery
Minimum loop current
Ground potential difference
Low DC loop resistance
during outpulsing
High DC loop resistance
Line leakage
Effective loss
NT8D15 E&M Trunk card
4-wire trunk
See pad table (Table 209 on
page 662)
600 ohms
N/A
DID Trunk
600 or 900 ohms, (selected
by software)
2450 ohms
Loop
-42 to -52.5 V
N/A
N/A
+ 10 V
N/A
N/A
Equal to or greater than 30
kS (Tip to Ring, Tip to GND,
Ring to GND).
See pad table
2-wire trunk
See pad table (Table 209 on
page 662)
600 ohms
600 ohms
CO trunk
600 or 900 ohms, (selected
by software)
1700 ohms
Ground or loop start
-42 to -52.5 V
-42.75 to -52.5 V
20 mA
+ 3 V
300 ohms
Ground start equal to or
greater than 30 kS. Loop start
equal to or greater than 5 MS
Equal to or greater than 30
kS (Tip to Ring, Tip to GND,
Ring to GND)
See pad table
Circuit Card Description and Installation
Page 653 of 906