Nortel Circuit Card Installation Manual page 166

Page 166 of 906
Analog line interface
553-3001-211 Standard 3.00
NT1R20 Off-Premise Station Analog Line card
Table 64 lists the electrical characteristics of NT1R20 OPS analog line card
line interface units.
Table 64
OPS analog line card – electrical characteristics
Characteristic
Terminal impedance (TIMP)
Balance impedance (BIMP)
DC signaling loop length (max)
Battery supply voltage
Minimum detected loop current
Ground potential difference
Line leakage
AC induction rejection
August 2005
Specification
600 or 900 ohms
600 or 900 ohms, 3COM, or 3CM2
2300 ohm loop (including resistance
of telephone) with nominal battery of
–48 V dc
–42 to –52.5 V dc
16 mA
± 3 V
> 30k ohms, tip-to-ring,
tip-to-ground, ring-to-ground
10 V rms, tip-to-ring,
tip-to-ground, ring-to-ground