Excavating
Patent
1989-11-09
1991-06-25
Smith, Jerry
Excavating
371 3, 371 33, G06F 1100
Patent
active
050273582
ABSTRACT:
To provide robustness within the SMSI data communication protocol, a voice message system stores all message-waiting update (MW) messages that it sends to a communication switching system, and periodically transmits a properly-formatted MW message bearing intentionally-corrupted data to the switching system over their connecting data link. After each transmission the voice message system awaits the return on the data link of an invalid message-waiting (IMW) message. If the IMW message is returned within a predetermined time period following transmission of the corrupted MW message, the voice message system treats the data link as viable and clears the stored MW messages. If the IMW message is not returned within the predetermined time period following transmission of each of two corrupted MW messages, the voice message system treats the data link as not viable and, following repair of the link, re-sends the stored MW messages to the switching system.
REFERENCES:
patent: 4380088 (1983-04-01), Lipcon
patent: 4766596 (1988-08-01), Michels-Krohn
Interface Description-Interface Between Customer Premise Equipment--Simplified Message Desk-and Switching System-1AESS, Bell Communications Research Technical Reference TR-TSY-000283 (Jul. 1985).
"Unisys Multiplies Available SMDI Ports", Voice Processing, Jun. 15, 1989, pp. 7-8.
O'Dell Thomas M.
Overmyer Ricky L.
AT&T Bell Laboratories
Beausoliel Robert W.
Smith Jerry
Volejnicek David
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