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US 4,506,358 AGranted
Time stamping for a packet switching system
AssigneeAT&T Bell Laboratories
InventorWarren A. Montgomery
Life of this patent
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AssigneeAT&T Bell Laboratories
InventorWarren A. Montgomery
Estimating the term…
A communication method and packet switching system in which packets comprising logical addresses and voice/data information are communicated through the system by packet switching networks which are interconnected by high-speed digital trunks with each of the latter being directly terminated on both ends by trunk controllers. During initial call setup of a particular call, central processors associated with each network in the desired route store the necessary logical to physical address information in the controllers which perform all logical to physical address translations on packets of the call. Each network comprises stages of switching nodes which are responsive to the physical address associated with a packet by a controller to communicate this packet to a designated subsequent node. The nodes provide for variable packet buffering, packet address rotation techniques, and intranode and internode signaling protocols. Each packet has a field which is automatically updated by the controllers for accumulating the total time delay incurred by the packet in progressing through the networks. Each processor has the capability of doing fault detection and isolation on the associated network, trunks, and controllers by the transmission of a single test packet. The testing is done solely in response to the test packet and no preconditioning of controllers or networks is necessary.
A system for communicating packets each comprising a time delay field for accumulating delay encountered by each of said packets, comprising:
A system for communicating packets comprising:
A system for switching packets between a plurality of customer terminals comprising:
A system for switching packets comprising:
A method of determining the total transmission time delay experienced by packets during transmission through a packet switching system, each of said packets comprising a first field for storing a first set of signals representing the total transmission time delay encountered by the packet, said packet switching system comprises first and second external transmission means, a network interconnecting a first and a second interface facility, said first and said second interface facilities are connected to said first and second external transmission means, respectively, and comprises the steps of:
A system for communicating transmission packets each comprising a time delay field for accumulating delay encountered by each and internetwork packets, said system comprising:
Dependencies are inferred from the claim text.