Telecommunications subscriber line interface circuit and party i

Details Telecommunications subscriber line interface circuit and party i Telecommunications subscriber line interface circuit and party i

1988-04-22

1989-08-29

Ng, Jin F.

Telephonic communications

Polystation line system

Automatic or unattended

379377, 379399, H04M 1536

Patent

active

048624950

ABSTRACT:
The invention provides a tip party identification facility in association with a subscriber line interface circuit. The tip party identification facility takes advantage of a shutdown feature and the output of a common mode error amplifier of the subscriber line interface circuit. The use of this facility enables the central office to determine whether the tip party or ring party is off-hook for billing purposes.

REFERENCES:
patent: 3939308 (1976-02-01), Shaver et al.
patent: 4056690 (1977-11-01), Brolin et al.
patent: 4371755 (1983-02-01), Brolin
patent: 4476350 (1984-10-01), Aull et al.
"Modern Electronic Devices Circuit Design and Application", M. Rosenstein et al., Reston Publishing Comp., Reston, Virginia, pp. 251-253, 1985.

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