NT8D15 E&M Trunk card Page 641 of 894
Circuit Card Description and Installation
Power requirements
Table 199 lists the power requirements for the E&M trunk card.
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 199
Power requirements
Voltage Tolerance Max current
+15.0 V dc ±5% 200 mA
–15.0 V dc ±5% 200 mA
+8.5 V dc ±2% 200 mA
–48.0 V dc ±5 % 415 mA
Table 198
Electrical characteristics of trunk cards (Part 2 of 2)
Characteristic DID Trunk CO trunk