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Hi,
It would be nice to know what the worst case link delays or ring RTT could be supported by the fairness algorithm
at 155Mbps.
thanks,
robert
> -----Original Message-----
> From: Mike Takefman [mailto:tak@xxxxxxxxx]
> Sent: Thursday, January 15, 2004 10:18 AM
> To: goy@xxxxxxxxxxxxxxxx
> Cc: stds-802-17@xxxxxxxx
> Subject: Re: [RPRWG] RPR over wireless links
>
>
>
> Geir,
>
> I have not really heard of anyone planning RPR over Wireless
> but in theory there is no reason why it could not work.
>
> Right now, the slowest SONET PHY that RPR supports is
> 155 Mb/s. Which fits into the range you were looking at.
>
> However, the design of the MAC was assuming
> fiber media, which had a very low bit error rate. I am
> aware that SONET radio links do exist and often include
> FEC coding schemes to decrease the error performance
> of the links.
>
> As to the additional link delays that could occur due
> to coding schemes, there are simulation models for
> RPR that could be modified to include such effects.
> If the delays were large enough, there could be
> issues with fairness.
>
> I cannot comment on Silicon Providers plans / products.
>
> cheers,
>
> mike
>
> goy@xxxxxxxxxxxxxxxx wrote:
> >
> >
> >
> >
> > Hello
> > Currently I'm study the applicability of using the RPR standard and
> > functionality over
> > wireless ring structures, or as a combination of fiber links.
> > This means that the typical data rates would be from STM-1
> - 4*STM-1.
> > Even data rates as low as 100 Mbit/s could be interesting
> in the entreprice
> > access market.
> >
> > So the I would like to ask the subscribers if anyone has planns or
> > any other comments on using the RPR over a wireless media
> and with such low
> > data rates?
> >
> > Question of interest:
> > Could wireless link quality be any problem?
> > Loss rate and faiding charcteristics?
> > Delay/hop requierement for low capacity links to maintain the RPR
> > functionality?
> > Silicon providers for low capacity?
> >
> >
> > Geir Åge Øye
> > Nera Research
> > Research Scientist
> > Phd Applied Mathemathics
> > Phone +47 55225559
> > Fax +47 55225299
> > goy@xxxxxxxxxxxxxxxx
> > (Embedded image moved to file: pic21003.gif)
> >
> >
> >
> --------------------------------------------------------------
> ----------
> >
>
>
> --
> Michael Takefman tak@xxxxxxxxx
> Distinguished Engineer, Cisco Systems
> Chair IEEE 802.17 Stds WG
> 3000 Innovation Dr, Ottawa, Canada, K2K 3E8
> voice: 613-254-3399 cell:613-220-6991
>