Terminal apparatus having a function for preventing unnecessary

Details Terminal apparatus having a function for preventing unnecessary Terminal apparatus having a function for preventing unnecessary

1989-03-15

1990-07-03

Ng, Jin F.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379 93, 379442, H04M 100, H04M 1100

Patent

active

049397770

ABSTRACT:
Terminal apparatus is disclosed which alternatively connects a data terminal apparatus by a first switching unit to a line. The terminal apparatus includes a telephone, on-hook transmit circuit, and second switching unit for connecting the telephone set and on-hook transmit circuit alternatively to the line via the first switching unit. The on-hook transmit circuit includes a unit responsive to an on-hook transmit operation to switch the second switching unit to an on-hook transmit circuit, unit responsive to a dial signal transmit operation to transmit the dial signal to the line, direct current closing unit which continues to be connected to the line with the second switching unit switched to the on-hook transmit circuit, line release detection unit and control unit. The line release detection unit generates a line release detection signal when the line release detection unit detects the line as being released. Upon the generation of the line release detection signal, the control unit supplies a switching control signal to the second switching unit to switch the second switching unit from an on-hook transmit circuit to a telephone set.

REFERENCES:
patent: 4506112 (1985-03-01), Bitsch
patent: 4741021 (1988-04-01), Kotani et al.
patent: 4764951 (1988-08-01), Kotani et al.
patent: 4807278 (1989-02-01), Ross
patent: 4825461 (1989-04-01), Kurita et al.

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