Telephonic communications – Plural exchange network or interconnection – Connection call model
Patent
1985-10-11
1987-04-07
Dwyer, James L.
Telephonic communications
Plural exchange network or interconnection
Connection call model
379243, H04M 700
Patent
active
046566589
ABSTRACT:
Circular paths in a multinode connection are avoided by passing an adaptive routing state, from node to node, which specifies the path options that the current node may use in its selection of a next step in the connection. The routing state, which is characterized by, for example, a single digit, is updated by the current node and is a function of the recent path history of the connection. The single-digit routing state controls the advancement of the connection by specifying whether the next selected step can be either a forward step, a null step or a backward step, or any combination thereof. A forward step advances the connection toward its destination, a null step does not advance the connection and a backward step causes the connection to step backward to a node not yet in the connected path. When a node selects a next step, it adapts the routing state digit to reflect its selection and passes the new routing state digit to the next node.
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Defense Communications Agency, Washington DC, DCA Circular 370-V120-1, Feb. 27, 1981.
"Analysis of Flow-Controls in Switched Data Network by a Unified Model", G. Pujolle, Institut de Recherche d'Informatique et d'Atomatique (IRIA) Laboria, 78150 LeChesnay, France, pp. 123-128.
"Methods, Tools, and Observations on Flow Control in Packet-Switched Data Networks, IEEE 1981, by Louis Pouzin, pp. 413-426.
American Telephone and Telegraph Company
AT&T Information Systems Inc.
Dwyer James L.
Luludis Frederick B.
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