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Browse Prior Art Database

Synchronous Polling

IP.com Disclosure Number: IPCOM000073868D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Liberman, RA: AUTHOR

Abstract

This circuit is directed to a data communication system which includes a monitor receiver for maintaining synchronization between a central station and a number of remote terminals. The monitor device located at each remote terminal maintains a running check on the carrier phase and bit timing of the data transmitted from the next most remote terminal in the data communication system, to allow further data transmission from the remote terminal without the need for transmitting a new synchronization polling sequence from the central station.

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Synchronous Polling

This circuit is directed to a data communication system which includes a monitor receiver for maintaining synchronization between a central station and a number of remote terminals. The monitor device located at each remote terminal maintains a running check on the carrier phase and bit timing of the data transmitted from the next most remote terminal in the data communication system, to allow further data transmission from the remote terminal without the need for transmitting a new synchronization polling sequence from the central station.

This data communication system includes a central control station 100 and a number of remote terminals 110, 120, 130, 140, etc., each of which includes a transmitting device 114, 124, 134, 144, and a receiving device 112, 122, 132, 142 and a monitor device 220, 230, 240, for monitoring the carrier phase and bit timing of the synchronization sequence to maintain the data communication system in synchronization.

A polling sequence is transmitted by central location transmitting device 102 along DATA OUT lines 300 to the most remote terminal 110 (terminal 1) and is received by receiving device 112. If remote terminal 110 has data to transmit, the data is transmitted by transmitting device 114 along DATA IN lines 310 to central location receiving device 104.

As data is transmitted by transmitting device 114, each monitor device 220, 230 and 240 monitors the carrier phase and bit timing of the signals from the central control location and transmits carrier phase error and bit timing error signa...