Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Patent
1996-02-06
1998-07-21
Olms, Douglas W.
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
370352, 370394, 370411, H04J 302
Patent
active
057843740
ABSTRACT:
An ATM switch is provided with two stages of crossbar switches with internal blocking paths between the stages. To define priorities of input ports, switches of stage 1 calculate the effective serial numbers of the input ports based on their physical serial numbers and global offset values. To provide dynamic modification of the input port priorities, the global offset values can be changed in each cell cycle of the ATM switch. A sequence of encoded requests for access to required output ports are sent from each switch of stage 1 to each switch of stage 2. Contention arbitration logic in each switch of stage 2 determines which requests may be granted so as to avoid blocking paths between stages 1 and 2, and to prevent out-of-order cell delivery. Signals that acknowledge acceptance of cells and provide information required to establish the serial numbers of the accepted input ports are sent back from each switch of stage 2 to each switch of stage 1. Based on these signals, the cells that will be accepted are routed through the switches of stages 1 and 2 to required output ports. The rejected cells may be queued for transmitting in the next cell cycle.
REFERENCES:
patent: 5157654 (1992-10-01), Cisneros
patent: 5357506 (1994-10-01), Sugaware
patent: 5404537 (1995-04-01), Olnowich et al.
patent: 5444705 (1995-08-01), Olnowich et al.
patent: 5511070 (1996-04-01), Lyles
"A High Speed Integrated Services Switch Based on 4 X 4 Switching Elements," IEEE Infocom '90, Ninth Annual Joint Conference of the IEEE Computer and Communications Societies, The Multiple Facets of Integration, Jun. 3-7, 1990, San Francisco, CA, USA, IEEE Computer Society Press, Los Alamitos, CA.
Advanced Micro Devices , Inc.
Hom Shick
Olms Douglas W.
LandOfFree
Contention resolution system in ATM switch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Contention resolution system in ATM switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Contention resolution system in ATM switch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1654122