Automatic synchronous/asynchronous modem

Details Automatic synchronous/asynchronous modem Automatic synchronous/asynchronous modem

1986-07-03

1987-12-22

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375111, 375117, 379 93, 379 97, H04L 2702

Patent

active

047150440

ABSTRACT:
There is disclosed an arrangement which enables a single modem port to be used for either synchronous or asynchronous data transmission, with no manual changes required. The modem determines whether the incoming call is synchronous or asynchronous by detecting the presence (or absence) of SYNC characters in the data stream immediately after handshaking. Once a determination has been made, the modem options itself accordingly for synchronous or asynchronous data handling. This arrangement eliminates the need for separate central office lines for synchronous and asynchronous data applications.

REFERENCES:
patent: 3139607 (1964-06-01), Grondin
patent: 3961138 (1976-06-01), Fellinger
patent: 4007421 (1977-02-01), Lien
patent: 4035580 (1977-07-01), Dieter
patent: 4079188 (1978-03-01), Kinch, Jr. et al.
patent: 4542517 (1985-09-01), Goss et al.
patent: 4586159 (1986-04-01), Thomas et al.
Data Set 212A Interface Specification, PUB41214, Publisher's Data Center Incorporated, P.O. Box C738, Pratt Street Station, Brooklyn, New York.

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