Connectionless ATM data services

Details Connectionless ATM data services Connectionless ATM data services

1991-12-16

1995-07-11

Hsu, Alpus

Multiplex communications

Wide area network

Packet switching

370 941, H04J 324, H04L 1256

Patent

active

054327776

ABSTRACT:
In a system using the Asynchronous Transfer Mode (ATM) for data transfers, each cell is usually routed in response to VPI/VCI values identifying a previously established connection. A connectionless transfer mode is disclosed by which to each requesting user, a unique routing identifier (RI) is allocated. All RIs allocated in the whole network are kept in a table of a routing identifier management function (RIMF). When a source user wants to send a message to a destination user, it requests the destination RI from the RIMF and inserts the received RI into each transmitted cell in the VCI field. The RI may, include a switching node identifier (SI) and a port identifier (PI). In that case, each switching node has a permanent table of all SIs plus respective routing information, and a changing table of all currently allocated PIs of locally connected users plus the respective user port names.

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