Cell Relay Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Re: Resilience of ATM
atwell@martegdm.demon.co.uk wrote: > > Does anyone know of any figures for the time to reroute over ATM. We > have tried this and it has taken around 35 seconds which is no good > for the real-time applications we are intersted in. > The setup we have is two ATM switches and a workstation at either end. > We connected two backbone cables between the ATM switches and timed > how long it took to reroute when one was disconnected. We are looking > for a figure of around 1 second. > Is this realistic? If not how is it possible to have redundancy over > ATM for real-time applications? We have 16 ATM switches (Cabletron 9A000 based on Fore 200BX), that make up our data backbone for the Port Kembla Steelworks. A 3 hop LAN Emulation established VC will be rerouted in less than 2 seconds. (We lose 1 ping packet). Most of the setup time is on the ATM Access modules, the VC setup is measured in 10s of milliseconds. (We are currently using Fore's proprietary SPANS signalling and LANE) Martin -- : Martin Visser : BHP Steel - Flat Products Division : Engineering Services - Computer Systems : PO Box 1854 Wollongong NSW 2500, AUSTRALIA : A.C.N. 000 019 625 : Phone +61-42-753852 : Fax +61-42-754141 : Email (Work) visser.martin.mc@bhp.com.au : (Home) mvisser@nspace.com.au : WWW (Home) http://www.nspace.com.au/~mvisser |
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