On Sun, 29 Oct 2000, Chuck Larrieu wrote:
> Speaking of evil test creators, the one I've always wondered about is actual
> T1/DS1 throughput. I believe serial lines are full duplex. So NOW what is
> the REAL bit rate? ;->
1.536Mbps is the actual usable bit rate of a clear channel t1. 8 bits is
used for framing. Yes that is in each direction. But if a circuit has
1Mbps incoming and 1Mbps outgoing, you still usually just call it a 1Mbps
fdx, instead of 2Mbps........at least I do. I know some peole refer to
100bT fdx as 200Mbps........but I think its more accurate to say 100Mb/s
fdx.
Brian
>
> Chuck
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
> Brian
> Sent: Saturday, October 28, 2000 4:52 PM
> To: Patrick Bass
> Cc: [EMAIL PROTECTED]
> Subject: Re: total bit rate for BRI
>
> On Sat, 28 Oct 2000, Patrick Bass wrote:
>
> > In Cisco internetworking Technology Overview it states...
> >
> > "BRI also provides for framing control and other overhead, brining its
> > total bit rate to 192 kbps."
> >
> > In Cisco Internetwork Design it states...
> >
> > "The D channel signaling protocol comprises Layers 1 through 3 of the OSI
> > reference model, brining its total bit rate to 144 kbps."
> >
> > If I'm taking a Cisco certification exam and the question is "What is the
> > total bit rate of a BRI" and the answers are a) 128 b) 144 c) 192 d)
> > whatever.......what's the correct answer? Is it 144 kbps or 192 kbps?
>
> You won't have those two answers :)
>
> This is sort of like the argument is a T1 1.544 or 1.536. Only the most
> evil test creator would put both those answers on a test...........
>
> You seem to understand it quite well. 192 is with framing, 144 is just
> 2B+D. You can actually use the D channel, but you can't use the framing
> bits.
>
> >
> > I realize that it is 192 kbps when you take the 48 kbps for framing into
> > account.... but considering the fact that two Cisco sources give different
> > totals for "total bit rate" what am I to answer if I wish to get the
> answer
> > correct?
> >
> >
> > _________________________________
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>
> -----------------------------------------------
> Brian Feeny, CCNP, CCDP [EMAIL PROTECTED]
> Network Administrator
> ShreveNet Inc. (ASN 11881)
>
> _________________________________
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-----------------------------------------------
Brian Feeny, CCNP, CCDP [EMAIL PROTECTED]
Network Administrator
ShreveNet Inc. (ASN 11881)
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