Nortel Networks Video Gaming Accessories 553-3001-211 Manual De Usuario

 NT8D15 E&M Trunk card

Note: * – CO ground start: the trunk is idled and the network taken 
down, but the incoming tie trunk is controlled by the originating end.

Table 197 lists the electrical characteristics of the trunk interface on the E&M 
trunk card.

 

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

Š20K¾

Š20K¾

Effective loss

See pad table (Table 204 on 

)

See pad table (Table 204 on 

Terminating impedance

600 ohms

600 ohms

Balance impedance

N/A

600 ohms

Nominal impedance

600 or 900 ohms, (selected 
by software)

600 or 900 ohms, (selected 
by software)

Signaling range

2450 ohms

1700 ohms