Time-division multiplex serial loop

Details Time-division multiplex serial loop Time-division multiplex serial loop

1981-06-30

1983-06-21

Robinson, Thomas A.

Multiplex communications

Wide area network

Packet switching

H04J 602, G08B 500

Patent

active

043897215

ABSTRACT:
A loop controller transmits data to and receives data from a plurality of I/O ports on a TDM serial loop by generating a plurality of frames which include a frame control field followed by a plurality of dedicated time slot fields. Each time slot field includes an inbound data control bit or bits followed by a data field followed by an outbound data control bit or bits. The I/O port inputs and outputs data in its dedicated data field as dictated by the respective data control bit. The loop controller and I/O ports monitor the data control bit to request data, indicate insertion of data, indicate receipt of the data and acknowledge the receipt indication to achieve a complete handshake. During an initialization frame, the I/O ports set themselves into primary and secondary data modes based on sensing a prior I/O port with the same dedicated time slot. Separate primary, secondary, inbound and outbound data control bits permit interleaved communication by the loop controller to and from plural ports with the same dedicated time slot.

REFERENCES:
patent: Re28811 (1976-05-01), Pierce
patent: 4287592 (1981-09-01), Paulish et al.

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