Thread View: comp.dcom.lans.fddi
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Started by Michael Lo Ho Fung
Wed, 06 Jan 1993 16:59
Giga switch
Author: Michael Lo Ho Fung
Date: Wed, 06 Jan 1993 16:59
Date: Wed, 06 Jan 1993 16:59
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I read the newletter of our computer service center. They are installing a Giga switch connect five FDDI ring together. And the speed will upgrade from 100Mbps to 3.5Gbps. Anyone can tell me what is Giga switch ? Why is can achive such high speed ? ------------------------------------------------------------------------------ | Lo Ho Fung Michael Comp 'N' | == Internet e-mail address == | | Department of | University : ee_hflo@stu.ust.hk | | Electrical & Electronic Engineering | Oversea BBS : mlo@nyx.cs.du.edu | | The Hong Kong University | Local BBS : michaelo@gnct.com | | of Science & Technology | Radio Call Sign : VR2YJR | ------------------------------------------------------------------------------
Re: Giga switch
Author: Louis Meadows
Date: Fri, 08 Jan 1993 01:09
Date: Fri, 08 Jan 1993 01:09
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In article <1993Jan6.165934.7185@uxmail.ust.hk>, ee_hflo@uxmail.ust.hk (Michael Lo Ho Fung) writes: > I read the newletter of our computer service center. They are installing >a Giga switch connect five FDDI ring together. And the speed will upgrade >from 100Mbps to 3.5Gbps. > > Anyone can tell me what is Giga switch ? Why is can achive such high >speed ? > > When I was at Interop in October Digital had such a switch. This switch used new "ATM" protocol. This switch had 2.2 Gbit rate. It could handle ten 100 mbit FDDI connections. "ATM" protocol is wonderfull. It gives may advantages to other methods of interconnect. "ATM" can handle voice, data, and video !!! It has a interesting way of making this happen. This is done by multiplexing small packets all of the same size. If you need assured bandwith, ATM can handle this by given you X number of slots to equal the bandwith needed. Let me know if you need to know more. Louis
Re: Giga switch
Author: waters
Date: Fri, 08 Jan 1993 14:05
Date: Fri, 08 Jan 1993 14:05
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In article <1993Jan8.010951.17172@tandem.com>, louis@cpd.Tandem.COM (Louis Meadows) writes:
|> In article <1993Jan6.165934.7185@uxmail.ust.hk>, ee_hflo@uxmail.ust.hk (Michael Lo Ho Fung) writes:
|> > ... They are installing a Giga switch connect five FDDI ring together.
|> > And the speed will upgrade from 100Mbps to 3.5Gbps.
|> > Anyone can tell me what is Giga switch? Why is can achive such high speed?
|>
|> When I was at Interop in October Digital had such a switch. This switch
|> used new "ATM" protocol. This switch had 2.2 Gbit rate. It could handle
|> ten 100 mbit FDDI connections. "ATM" protocol is wonderfull.
Some of that is misleading.
GIGAswitch(tm), to be sold later this year, starts out as a 22-port
FDDI bridge, growing later to 34 ports. Its backplane can handle
3.6 Gbit/s and 6.25 million packets/s. The switch transparently handles
all existing IEEE 802.2 LAN protocols. The ATM line cards for the
GIGAswitch are optional, and will become available some time after the
FDDI bridging function.
To answer Michael's question, the peak aggregate data rate on five
FDDI rings that may send packets to each other is nearly 5 * 100 Mb/s.
Hong Kong Univ. would have to install 22 FDDI rings in order to
approach a peak aggregate rate of 2.2 Gb/s, or 34 rings for 3.4 Gb/s.
Any packets that need to cross rings will pass through the GIGAswitch.
(GIGAswitch is a trademark of Digital Equipment Corp.)
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