Nortel Networks 553-3001-211 manual Analog line interface

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