Cell Relay Archive

[jcrhodes <jeffrey.rhodes@attws.com>]

In article <3725EED8.EBF14@xedia.com>,
  Paul Koning <pkoning@xedia.com> wrote:
> jcrhodes wrote:
> > Is it possible for the control IP traffic to overwhealm the traffic
> > management such that only control packets are passed and no payload is
> > possible during such "meltdown"?
>
> What sort of meltdown?

The kind that usually follows an act of God, such as an earthquake or tidal
wave.

> I don't think this is likely.  Control traffic is normally a very
> small part of the total.  If the network is very unstable then it
> goes up.
>
> In fact, giving priority to control traffic is correct.  There have
> been documented cases of network meltdown caused by giving priority
> to DATA traffic at the expense of control traffic.  Doing so is a
> serious design error.
>
> > > The original note overstates the latency issue.
> >
> > Not really, since the original note claims that the synchronous data
networks
> > of the world need not be concerned with latency variations, since the
latency
> > is fixed for a given "talkpath" of synchronous circuits.
>
> The way I interpreted the original note is that it claimed ONLY
> synchronous data networks provide low enough jitter for good
> voice quality.  That's not true.  They certainly are good enough,
> but it is perfectly well possible to get low enough jitter on
> asynch networks.
>
> 	paul

No, the original note (mine) claims that a voice call on the sync network will
"sound" better when its control channel is in meltdown, I do not believe that
async networks will be able to establish such a track record for voice calls,
let alone "sound" OK when the control traffic is interfering with the DATA
traffic. IOW, I make the case that async networks will ALWAYS be dependent on
sync networks for "real time" communications, whenever the async networks get
into trouble from "data storms".  ;-)

Thanks for responding, regards, jcr

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