Page 164 of 894 NT1R20 Off-Premise Station Analog Line card

Analog line interface

Table 63 lists the electrical characteristics of NT1R20 OPS analog line card line interface units.

Table 63

OPS analog line card – electrical characteristics

Characteristic

Specification

 

 

Terminal impedance (TIMP)

600 or 900 ohms

 

 

Balance impedance (BIMP)

600 or 900 ohms, 3COM, or 3CM2

 

 

DC signaling loop length (max)

2300 ohm loop (including resistance

 

of telephone) with nominal battery of

 

–48 V dc

 

 

Battery supply voltage

–42 to –52.5 V dc

 

 

Minimum detected loop current

16 mA

 

 

Ground potential difference

± 3 V

 

 

Line leakage

> 30k ohms, tip-to-ring,

 

tip-to-ground, ring-to-ground

 

 

AC induction rejection

10 V rms, tip-to-ring,

 

tip-to-ground, ring-to-ground

 

 

553-3001-211 Standard 2.00 September 2004

Page 164
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Nortel Networks 553-3001-211 manual Analog line interface