Electrical Specifications; Trunk Interface Electrical Characteristics - Nortel Enterprise 1000 Reference Manual

Electrical specifications

Trunk interface electrical characteristics

Table 22
Electrical characteristics of the E&M trunk interface
Characteristic
Signaling range
Signaling type
Far-end battery
Near-end battery
Ground potential difference
Line leakage between E lead
and ground
Effective loss
Terminating impedance
Balance impedance
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
This section lists the electrical specifications for the E&M trunk card.
Table 22 lists the electrical characteristics of the trunk interface on the E&M
trunk card.
4-wire trunk
Type I
Type II
Type I, Type II
–42 to –52.5 V dc
–42.75 to –52.5 V dc
+10 V dc
Š20K ohms
See pad table (Table 28 on
page 129)
600 ohms
N/A
NT8D15 E&M Trunk Card
150 ohms
300 ohms loop
Page 121 of 236
2-wire trunk
Type I 150 ohms
Type I
–42 to –52.5 V dc
–42.75 to –52.5 V dc
+10 V dc
Š20K ohms
See pad table (Table 28 on
page 129)
600 ohms
600 ohms