Nortel Networks Video Gaming Accessories 553-3001-211 Manual De Usuario
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.
line interface units.
Table 63
OPS analog line card – electrical characteristics
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
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
tip-to-ground, ring-to-ground
AC induction rejection
10 V rms, tip-to-ring,
tip-to-ground, ring-to-ground
tip-to-ground, ring-to-ground