Frame relay switching apparatus and router

Details Frame relay switching apparatus and router Frame relay switching apparatus and router

1994-08-02

1998-03-31

Ton, Dang

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

370401, H04L 1256

Patent

active

057346542

ABSTRACT:
A frame relay switching apparatus in a frame relay network employs a frame format used in a frame relay communication between a plurality of terminals, performed by identifying a destination by a data link connection identifier (DLCI) in an address field. Priority or non-priority information for an identifier provided in a frame being transmitted for identifying a destination terminal is registered for each DLCI so that a zone assigned to each of them is not overflown, to prevent a frame having a priority DLCI from being discarded. In case of congestion, all frames having identical non-priority DLCIs are discarded at the same time. The switching apparatus includes a plurality of transmitting buffers provided at each outgoing line, and a common buffer, which can be shared by a plurality of lines. A congested line writes a received frame in the common buffer and takes the frame out from the common buffer to write it in a respective transmitting buffer when the congestion has been resolved. When performing inter-LAN communication, a router sets a priority level, which is determined in accordance with a destination address on a LAN and a LAN protocol, in the address field of a frame relay frame and sends it out to the frame relay network.

REFERENCES:
patent: 5130984 (1992-07-01), Cisneros
patent: 5140417 (1992-08-01), Tanaka et al.
patent: 5140584 (1992-08-01), Suzuki
patent: 5224099 (1993-06-01), Corbalis et al.
patent: 5237564 (1993-08-01), Lespagnol et al.
patent: 5355372 (1994-10-01), Sengupta et al.
patent: 5390184 (1995-02-01), Morris
patent: 5398235 (1995-03-01), Tsuzuki et al.

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