value of co-location

Bilal Chinoy bac at
Mon Jan 22 18:36:28 UTC 1996

"The GIGAswitch System: A High-Performance Packet
Switching Platform".
Robert J. Souza et al (7 listed authors)
Digital Technical Journal, vol. 6, no. 1 1994.

The switch fabric is a non-blocking crossbar capable
of full 100 Mbps full duplex rates (actually, about 150 Mbps: 
a 25 Mhz clock with a 6 bit data path). Custom VLSI.

The FDDI cards have 1 MB/port that (i believe) is used for 
packet buffering. Both input and output buffering is
required. Cut through forwarding is supported.

Bottom line: about 270,000 pps per port, 14 microsec. 
forwarding latency AND superior reliability. The choice
for NAP designers everywhere :)-

				-- Bilal
> While we are on the subject of delay-bandwidth buffering in ATM switches.
> Does anyone know where I can get a router that has adequate buffering
> for those pesky little 1/4 Kbyte average size packets that keep
> floating around the net :).
> 	-joe
> PS. Also does someone have numbers for the amount of
> buffering in a DEC gigaswitch, and information on their buffer
> managment (i.e. variable length buffers vs fixed length buffers).

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