Data communications equipment interface leads to signal half-dup

Details Data communications equipment interface leads to signal half-dup Data communications equipment interface leads to signal half-dup

1992-12-17

1995-03-07

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

H04L 514, H04L 516

Patent

active

053964861

ABSTRACT:
The Electronic Industry Association (EIA) RS-232 interface signals are manipulated to additionally convey operating mode information from a piece of data communications equipment (DCE) to its respective data terminal equipment (DTE). In particular, in establishing a data connection, the data communications equipment may transmit information in either half-duplex mode or full-duplex mode. In order to convey which mode of transmission is being used, the data communications equipment manipulates the EIA RS-232 interface signals to provide a notification signal, which is representative of the particular mode, to the data terminal equipment. As a result of receiving this notification signal, the data terminal equipment can then switch to the same mode of operation.

REFERENCES:
patent: 4599719 (1986-07-01), Breen et al.
patent: 4653044 (1987-03-01), Kudo
patent: 4771417 (1988-09-01), Maxwell et al.
patent: 4893305 (1990-01-01), Fernandez et al.
patent: 4897831 (1990-01-01), Negi et al.

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