From: Michael Spencer (labmich2002@xxxxxxxxx)
Date: Tue Aug 27 2002 - 02:54:11 GMT-3
Hi Scott and Dmitry,
Thanks for you help.
--- "Volkov, Dmitry (Toronto - BCE)"
<dmitry_volkov@ca.ml.com> wrote:
> There is one good link with some pdfs about T1,
> etc.:
>
>
http://www.acterna.com/united_states/technical_resources/white_papers/index.
> html
>
>
> Dmitry
>
> -----Original Message-----
> From: Michael Spencer [mailto:labmich2002@yahoo.com]
> Sent: Monday, August 26, 2002 2:00 PM
> To: swm@emanon.com; 'Richard Foltz';
> ccielab@groupstudy.com
> Subject: RE: T1 line
>
>
> Hi Group,
>
> Thanks for your help. One more question, what could
> be
> the best definition of T1.
>
> TIA
>
>
> --- Scott Morris <swm@emanon.com> wrote:
> > Simple math actually...
> >
> > 24 channels x 64k per channel = 1536Kbps or
> > 1.536Mbps of actual
> > BANDWIDTH
> >
> > Now, when we look at the actual bits that are
> sent.
> > Within a T-1 frame,
> > there are 8 bits per channel (24 * 8 = 192 bits).
> > However, there's a
> > single framing bit too, used for synchronization
> and
> > other functions.
> > So 193 bits per frame, at 8,000 frames per second
> > gives us 1.544 Mbps of
> > actual BIT RATE.
> >
> > Some serial interfaces (and it actually depends on
> > the model of router
> > and version of IOS) actually count the full bit
> > rate!
> >
> > Hope that helps!
> >
> > Scott
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com
> > [mailto:nobody@groupstudy.com] On Behalf Of
> > Richard Foltz
> > Sent: Monday, August 26, 2002 8:41 AM
> > To: Michael Spencer; ccielab@groupstudy.com
> > Subject: Re: T1 line
> >
> >
> > Minor correction. A T1 has 24 channels. If you use
> a
> > PRI then you are
> > using one of the channels for signalling (D
> > Channel). But a T1 itself is
> > 24 channels.
> >
> > Richard Foltz, CCIE#8339
> >
> > ----- Original Message -----
> > From: "Michael Spencer" <labmich2002@yahoo.com>
> > To: <ccielab@groupstudy.com>
> > Sent: Monday, August 26, 2002 6:46 AM
> > Subject: T1 line
> >
> >
> > > The speed of T1 line is 1.544Mbps. The T1 is
> > consists of 23B(64K)
> > > channels
> > and one D channel(64K). If we do the simple
> > arithmetic then it comes out
> > to be 1.536Mbps. Then why the serial interfaces
> are
> > configured as
> > default 1.544Mbps.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > ---------------------------------
> > > Do You Yahoo!?
> > > Yahoo! Finance - Get real-time stock quotes
> > >
> >
>
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