Device for connecting a subscriber line to a selected internal l

Details Device for connecting a subscriber line to a selected internal l Device for connecting a subscriber line to a selected internal l

1990-03-13

1992-09-01

Dwyer, James L.

Telephonic communications

Telephone line or system combined with diverse electrical...

Remote control

379286, 379342, H04M 1100, H04M 300, H04M 100

Patent

active

051446529

ABSTRACT:
Device for connecting one out of a plurality of internal lines (34,36) to an information exchange subscriber line, such as a telephone, facsimile or telex line, provided with decoding means (28,1-16) to detect dialling disc pulses (a), preferably on base of the time period between edges (b',b") of these pulses, timing means (9,10,12) to determine a time interval after an edge in which the next edge should occur and a test means (13) to ascertain whether said next edge occurred indeed in said interval.

REFERENCES:
patent: 3879583 (1975-04-01), Rooks
patent: 3935392 (1976-01-01), Smith et al.
patent: 4013838 (1977-03-01), Tsai
patent: 4319091 (1982-03-01), Meri
patent: 4618742 (1986-10-01), Castro
patent: 4771450 (1988-09-01), Castro et al.
patent: 4821312 (1989-04-01), Horton et al.
patent: 4868873 (1989-09-01), Kamil

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