1977-01-17
1978-06-06
Claffy, Kathleen H.
H04M 342
Patent
active
040938263
ABSTRACT:
A circuit is provided for improving the manner in which tone signaling-to-dial pulse converters interface with prior art dial pulse registers. Instead of allowing the converter to operate the register's line supervisory relay, the converter directly operates the dial pulse counting relays of the register. In this way, changes in battery and ground potential and impedance which may be noticeable each time the conversion apparatus pulses the line relay are eliminated, and the line relay in the register is allowed, uninterruptedly, to supply battery and ground to the multifrequency signaling station throughout the duration of signaling. The direct operation of the pulse counting relays permits faster pulsing speeds because neither the distributed capacitance of the line nor the lumped capacitors used in connection with the line relay are in the pulsing path.
REFERENCES:
patent: 2875278 (1959-02-01), Lueders
patent: 3453391 (1969-07-01), Hubbell
patent: 3818144 (1974-06-01), Druyff et al.
patent: 3917913 (1975-11-01), Patten
American Telephone and Telegraph Inc.
Claffy Kathleen H.
Myers Randall P.
Popper Howard R.
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