exactly, I was wondering when someone would catch this. A T1 typically
uses ppp or hdlc encapsulation, whereas frame relay uses frame relay.
Frame relay to remote offices, when it is 56k, is sometimes deployed via a
DS0 circuit. Both frame relay and t1 can be 56kilobits to 1.544megabits.
Brian "Sonic" Whalen
Success = Preparation + Opportunity
On Thu, 28 Jun 2001, Rik Guyler wrote:
> Well, it's not necessarily true that a T1 circuit is a frame circuit. A T1
> is simply the layer 1 technology. In other words, just a piece of wire
more
> or less. Frame relay on the other hand is a layer 2 technology. It will
> typically run on T1 layer 1 technology but not always. There is a 56k
> flavor of frame available and this is not run on a T-carrier circuit.
>
> What layer 2 encapsulation does a "standard" T1 use if not frame relay you
> ask? Usually HDLC. In fact, when setting up a serial interface on a Cisco
> router in preparation for a T1, full or fractional, the default layer 2
> encapsulation is HDLC and not frame relay. You can run PPP on a T1. This
> is typically used when your upstream router is a non-Cisco router as
Cisco's
> HDLC is proprietary and not compatible with another vendor such as Nortel.
>
> When somebody says "I have a T1 to the Internet", they are usually bragging
> about the size of their "pipe", which is roughly 1.5Mbs for a full T1. The
> fact that it's a circuit providing access to the Internet has nothing to do
> with the layer 2 encapsulation as it could be FR, HDLC, or PPP. That was
> not always the case as the frame relay "cloud" was just recently introduced
> to the Internet "cloud", so now many ISPs will provide access via their
> private frame relay network.
>
> Good luck!
>
> Rik
>
> -----Original Message-----
> From: Sam [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, June 28, 2001 7:06 PM
> To:
> Subject: Re: T1 concept? [7:10300]
>
>
> There really is no difference between a T1 to your ISP or a T1 to a branch
> office (in the scenario you outlined).
> Of course the one obvious difference is that the T1 to your HQ is part of
> your corporate "frame relay cloud" and the T1 to the internet is part of
> your ISPs frame relay cloud.
> T1 are usually frame relay connections, therefore they use frame-relay
> encapsulation.
>
> ""RJ"" wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > Hello,
> >
> > What is the difference between a frame connection to a branch office (I
> have
> > configured this) and T1 to the internet (I don't know how this is
> > configured).
> > I have heard that our company has a T1 from a (HQ)Atlanta to
> > (backoffice)Tampa.
> > Also they have a T1 to the internet.
> > They also have numerous frame connections to small offices through out
the
> > country.
> >
> > When somebody says that they have a T1 to the internet what exactly does
> > this mean? What protocols (encapsulation) are they running? Is it PPP or
> is
> > it a frame connection? How does one connect to the ISP?
> >
> > I am sure these questions have simple answers. Can somebody please
explain
> > this concept?
> >
> > Thanks in advance.
> >
> > Regards,
> >
> > RJ.
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