Asynchronous addressable electronic key telephone system

Details Asynchronous addressable electronic key telephone system Asynchronous addressable electronic key telephone system

1985-07-26

1988-04-26

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 96, H04J 324, H04J 316

Patent

active

047409576

ABSTRACT:
A high rate of exchange of information between a control station and each one of multiple associated stations in a key telephone system is economically achieved by using a multipurpose computer in each station to provide the UART function. Serial transmission of asynchronous data is full duplex for the control station and half duplex for ech associated station, with the control station polling a first station and then obtaining that station's response. While the first station is responding, the control station polls a second station and continues in this manner until all the associated stations are polled. The UART function also allows the computer to process other tasks during the same period of time that the serial transmission or reception of data is occurring.

REFERENCES:
patent: 4583217 (1986-04-01), Kittel
patent: 4594705 (1986-06-01), Yahata et al.

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