Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
1985-09-18
1988-01-05
Rubinson, Gene Z.
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
379355, 375 8, H04M 1100
Patent
active
047180820
ABSTRACT:
A modem for interfacing digital data communications between a data processing terminal and a telephone link contains, in the modem front panel, a control switch configuration for effecting automatic dialling of a previously stored telephone number, thereby enabling the automatic placement of a call for either an asynchronous or synchronous terminal which cannot perform modem command language. As an additional feature the modem of the present invention provides the capability of allowing an asynchronous terminal, using the command language of the modem via a first asynchronous interface, to place a call for either a synchronous terminal or an asynchronous terminal which cannot support the modem command language and, as a result, is connected to a second interface. The first interface is coupled to a modem control processor through which communication commands for the operation of the modem are effected. The second interface is coupled directly (thereby bypassing the control processor) to a modulator/demodulator or "data pump" for directly interfacing data between the telephone link and the device that is coupled to the second interface, which device, in effect, takes over control of the communication through that port.
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Backus Data Systems, pamphlet, Jun. 1985.
Parker Scott S.
Scheffler Timothy H.
Schirmer Paul W.
Ark Electronics
Connors Matthew E.
Rubinson Gene Z.
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