[19187] in North American Network Operators' Group
Re: FR Tidbit [was: 56k modems/frame/ptp revisited (LONG)]
daemon@ATHENA.MIT.EDU (Owen DeLong)
Wed Sep 2 03:14:01 1998
From: owen@DeLong.SJ.CA.US (Owen DeLong)
To: scott@digisle.net
Date: Wed, 2 Sep 1998 00:06:07 -0700 (PDT)
Cc: dan.scott@msfc.nasa.gov, nanog@merit.edu, tim@clipper.net,
tech@clipper.net
In-Reply-To: <Pine.GSO.3.96.980901083913.22515C-100000@guinness.digisle.net> from "scott w" at Sep 1, 98 08:45:45 am
Depends on your telco. If the system is built correctly, CIR is always
guaranteed, because the sum of all CIRs on a given physical link should
never exceed the bandwidth of the link. However, many telcos oversell
CIR because they (and their customers) don't understand with CIR is
supposed to mean.
Owen
>
> On Tue, 1 Sep 1998, Scott, Dan wrote:
>
> [snip]
> > line and port, but the important parameter is the committed information rate
> > you purchase from the carrier. Most of Sprint's frame relay business may
> [snip]
> >from 0-56kbps. Can purchase 56kbps CIR, but it costs extra, would need
> [snip]
>
> CIR is guaranteed only under "normal" conditions. You won't get it under
> heavy congestion. Find out the MIR configured for your PVC. I don't know
> if they will tell you though...
>
> scott
>
>
>
