John,
Thanks a lot for your help, I am setting up a point to
point T1 link, most of the traffic will be file and
email access. With so many options available for
encapsulation how do you choose what's the best. I
have a cisco 7206 on one side and 1604 on the other.
Do you have any suggestions for me
--- John Neiberger <[EMAIL PROTECTED]> wrote:
> The discrepancy you're seeing has nothing to do with
> frame relay overhead,
> but more with the number of signalling bits present
> in the T1. To provide
> clocking, a T1 circuit using ESF (extended super
> frames) and B8ZS (binary
> eight-zero substitution) coding will insert bits
> into the stream, I believe
> one on every frame, as a timing reference. Because
> that one bit per frame
> is used for clocking and not data, it reduces your
> actual throughput to 1536
> Mbps.
>
> I don't believe that frame relay has any more
> overhead than a point to point
> circuit running HDLC, for instance. Both circuits
> encapsulate your data
> into another type of datalink format before sending
> it over the wire. Point
> to point HDLC, however, doesn't have FECN, BECN,
> LMI, etc., so I guess in a
> way it's true that there is more protocol-specific
> traffic on a frame relay
> circuit than there would be on a ptp.
>
> I hope that helps! Feel free to ask me any more
> questions. It helps me to
> remember this stuff if I have to explain it to
> someone else.
>
> Later,
> John Neiberger, CCNA/CCDA
>
> > Thank you for your help, I have one more question
> :
> > The bandwidth for a p-to-p connnection, should
> that be
> > 1544 Mbs as compared to 1536 Mbs since there is
> no
> > frame-relay overhead ?
> > --- "Feliz, Edgar" <[EMAIL PROTECTED]> wrote:
> > > John,
> > >
> > > If you order a T1 from A provider that is 1536
> Mbs
> > > you get that bandwidth
> > > all to yourself you DO NOT have to SHARE it
> with
> > > anyone. It is as if you,
> > > and the other side of the connection had a long
> > > cable between the two sites,
> > > and only those two site could used that cable.
> All
> > > of the data you transmit
> > > under normal circumstance (no errors) will get
> > > through. This comes at a
> > > price.
> > >
> > > Frame-Relay on the other hand is shared
> bandwidth.
> > > Yes! the provider will
> > > under normal conditions guarantee the bandwidth
> that
> > > you request (CIR =
> > > Committed Information Rate), say 256k, 512k
> etc. You
> > > will even be able to
> > > burst for a certain period of time if there is
> > > bandwidth available to your
> > > port speed. But if the network becomes
> congested
> > > some of your packets will
> > > not get to their destination because they could
> have
> > > met a condition (DE +
> > > Discard eligible) set in the core network, or
> by the
> > > subscriber, that
> > > required them to be dropped under certain
> > > circumstances, like high network
> > > congestion,(This varies as some carriers will
> not
> > > drop packets, but there
> > > may be longer delays). When I say that it is
> shared
> > > bandwidth I say this
> > > because in fact you are sharing the bandwidth
> in the
> > > Core Network of your
> > > provider with hundreds of other subscribers to
> the
> > > service.
> > >
> > > Hope this helps,
> > >
> > > EF
> > >
> > > -----Original Message-----
> > > From: John Zaggat [mailto:[EMAIL PROTECTED]]
> > > Sent: Tuesday, June 13, 2000 1:15 PM
> > > To: CiscoGroupstudy
> > > Subject: Diff between point to point T1 and T1
> with
> > > framerelay
> > >
> > >
> > > Can some clearly explain the difference, I have
> > > checked the Archives and not found a good
> > > explanation.
> > > Also if you have some sample configs, that
> would be
> > > a
> > > great help to me.
> > > Thank you.
> > >
> > > =====
> > > JZ
> > > [EMAIL PROTECTED]
> > >
> > >
> > >
> > >
> __________________________________________________
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> > =====
> > JZ
> > [EMAIL PROTECTED]
> >
> >
> >
> >
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=====
JZ
[EMAIL PROTECTED]
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