Data communication apparatus

Details Data communication apparatus Data communication apparatus

1996-01-23

1998-02-24

Ton, Dang

Multiplex communications

Duplex

Convertible to half duplex

H04B 320

Patent

active

057217319

ABSTRACT:
When a protocol signal by a full duplex communication is transmitted and received, an error termination due to the disabling of the full duplex communication in the course of the communication is minimized. When an acknowledge signal is not received within a predetermined period from the start of the sending of the protocol signal by a modem to a destination station, a control circuit switches the protocol from the execution of the V.8 or V.34 protocol by the full duplex communication to the execution of the V.21 protocol of the T.30 and continues the image communication. Further, when the protocol signal is transmitted and received by the full duplex communication, the error termination due to the disabling of the full duplex communication in the course of the communication is minimized. When the acknowledge signal is not received within the predetermined period from the start of the sending of the protocol signal to the destination station, the execution of the V.8 or V.34 protocol by the full duplex communication is terminated in error and the image communication is executed at redialing by the V.21 protocol of the T.30.

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