Solid state signal insertion circuit and method for use in a tel

Details Solid state signal insertion circuit and method for use in a tel Solid state signal insertion circuit and method for use in a tel

1983-12-27

1986-09-02

Rubinson, Gene Z.

179 18FA, 179 84R, H04M 302

Patent

active

046097821

ABSTRACT:
A solid state insertion circuit comprising an opto-coupler triac driver is activated by a solid state switch to insert a ringing signal onto a subscriber telephone path in order to ring, for instance, a telephone. The opto-coupler driver functions as a zero voltage crossing triac to apply the ringing signal onto the telephone line only at a zero voltage cross-over thereof to thereby inhibit noise transients from being generated.

REFERENCES:
patent: 3914556 (1975-10-01), Frazee
patent: 4119905 (1978-10-01), Head
patent: 4262172 (1981-04-01), Brolin
patent: 4361798 (1982-11-01), Tolmie, Jr.
"Electronic Line Pack with Opto-Electronic Line Isolation", M. A. Patten, IBM Technical Disclosure Bulletin, vol. 20, No. 1, Jun. 1977, pp. 375-376.
"One Chip Closes in on SLIC Functions", L. Brown et al., Electronic Design, Sep. 27, 1980, pp. 85-91.

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