[19403] in North American Network Operators' Group
Re: Inter-CO signaling?
daemon@ATHENA.MIT.EDU (Jared Mauch)
Thu Sep 10 16:54:29 1998
Date: Thu, 10 Sep 1998 16:37:09 -0400
From: Jared Mauch <jared@puck.nether.net>
To: "Robert E. Seastrom" <rs@bifrost.seastrom.com>, cskidmor@nwnexus.net
Cc: nanog@merit.edu
In-Reply-To: <199809101909.PAA07293@bifrost.seastrom.com>; from Robert E. Seastrom on Thu, Sep 10, 1998 at 03:09:45PM -0400
someone here in our office was saying you can extract this out
of the modem after and during the call. Consult your modem manual
for specific directions, but I think they said it was at&v1
- jared
On Thu, Sep 10, 1998 at 03:09:45PM -0400, Robert E. Seastrom wrote:
>
> RBS is often run on B8ZS/ESF too.
>
> The reason it is not commonly run on inter-office trunks is because of
> a remarkable new innovation called SS7. Perhaps you have heard of it.
>
> Anyway, since the bits in robbed-bit signaling are "robbed" from the
> superframe not from your DS0, it is irrelevant to your throughput.
>
> From: Chad Skidmore <cskidmor@nwnexus.net>
>
> RBS is often times run on on AMI D4 circuits. Also, RBS is generally
> not run on inter-office trunks.
>
> At least that was the case a few months ago when I worked on a DMS-500.
>
> > From: Robert E. Seastrom [mailto:rs@bifrost.seastrom.com]
> > of course, robbed bit signalling and AMI have nothing to do
> > with one another...
> >
> >
> > From: Chad Skidmore <cskidmor@nwnexus.net>
> >
> > Try making an ISDN call from one to the other at a 64k
> > rate. If you can
> > get through then there are at least some trunks setup as
> > ESF B8ZS clear
> > channel. I suspect that they are probably some older
> > trunks running AMI
> > D4.
> >
> > > From: Dan Hollis [mailto:goemon@sasami.anime.net]
> > >
> > >
> > > Is there any way to determine if inter-telco links are using
> > > robbed bit
> > > signaling? Eg from GTE to USwest in the Seattle area.
> > >
> > > I suspect RBS may be causing lots of v.90 problems in
> > GTE country in
> > > Seattle. But id like to know how to confirm this. And just
> > > maybe, get it
> > > fixed.
--
Jared Mauch | pgp key available via finger from jared@puck.nether.net
| http://puck.nether.net/~jared/
