Modem with automatic port reconfiguration apparatus

Details Modem with automatic port reconfiguration apparatus Modem with automatic port reconfiguration apparatus

1979-02-01

1981-05-26

Stewart, David L.

Multiplex communications

Wide area network

Packet switching

370112, H04J 316, H04J 602

Patent

active

042702020

ABSTRACT:
Circuitry for automatically and dynamically reconfiguring the channel or port configuration of a modem handling a plurality of ports. A standard signal such as DTR (data terminal ready) is used to provide a code to a master modem indicating the particular port configuration requested by cooperating apparatus. The requested configuration code is continuously compared to a code stored by a shift register controlling the actual modem port configuration. When the requested code changes, an indication of the code change is transmitted to a communicating slave modem and a control signal is sent, after a suitable delay, to the shift register to conform its contents to the newly requested configuration code. During the delay, the slave modem switches to the newly requested configuration. The circuitry follows a defined sequence of configuration switching, dropping channels successively and adding channels by passing through the state where all channels are active. In an alternative system operation, each of two communicating modems may be synchronized by the cooperating apparatus such that a configuration charge need not be communicated across the transmission line.

REFERENCES:
patent: Re28577 (1975-10-01), Schmidt
patent: 3700820 (1972-10-01), Blasbalg
patent: 3790715 (1974-02-01), Inose
patent: 3927268 (1975-12-01), Sciulli

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