Error control for digital multipoint circuits

H - Electricity – 04 – L

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354/222

H04L 12/00 (2006.01) H04L 25/20 (2006.01) H04Q 5/00 (2006.01) H04H 9/00 (2006.01)

Patent

CA 1079407

ERROR CONTROL FOR DIGITAL MULTIPOINT CIRCUITS Abstract of the Disclosure A multipoint synchronous data network is formed by junction units which provide signal paths that inter- connect incoming branch lines to a common outgoing branch. The junction unit is arranged to combine the branches so that data words on one branch are propagated up the common branch, subject to the condition that only one branch can send to the common branch at a time. Each data word includes a designation whether the word carries message information or control information (such as an idle branch condition). Control words are blocked by the junction unit so that message words from a sending branch are not garbled by control words from idle branches. The junction unit passes each message word from a sending branch to the common branch if the junction unit had not priorly passed any message word to the common branch (presumably because all branches were idle) or if a message word priorly passed was from the sending branch whereby error conditions on idle branches simulating message words are not passed to garble the data from the sending branch. This control is maintained by the sending branch for a plurality of word intervals after it has terminated sending data. - i -

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