Priscilla,
In the Cisco Networking Academy (Sem4) curriculum, significantly more time is spent on
PPP operation & configuration than Cisco's HDLC. One might get the impression from
this
that Cisco is pushing the use of PPP (with its better security features) over its own
HDLC even in an all Cisco environment.
Tom Lisa, Instructor, CCNA, CCAI
Community College of Southern Nevada
Cisco Regional Networking Academy
Priscilla Oppenheimer wrote:
> At 11:58 PM 2/7/01, Santosh Koshy wrote:
> >Thanks priscilla, that helped tremendously...
> >If that is the case... then what is the most common L2 Encapsulation used
> >when usually setting up a T1 link...(point to point)
> >Is it safe to assume HDLC as that is the default encap on the cisco routers
>
> HDLC is common for point-to-point links, but Cisco's HDLC is non-standard,
> so if you were connecting to a non-Cisco router you would probably use PPP.
>
> In many parts of the world, Frame Relay is the most common WAN
> encapsulation, but it sounded like you were asking about point-to-poin
> circuits, so that might not be relevant.
>
> Priscilla
>
> >----- Original Message -----
> >From: "Priscilla Oppenheimer" <[EMAIL PROTECTED]>
> >Newsgroups: groupstudy.cisco
> >Sent: Wednesday, February 07, 2001 11:50 PM
> >Subject: Re: T1 Link
> >
> >
> > > Seeing that nobody had really addressed your question yet, I decided to
> > > take a stab at it.
> > >
> > > T1 is a high-speed digital carrier facility developed by AT&T in the 1950s
> > > to support long-haul pulse-code modulation (PCM) voice transmission. T1
> > > provides digital voice circuits or "channels." There are 24 channels per
> > > each T1 line or "trunk."
> > >
> > > AT&T describes their Digital Carrier System as a "two-point, dedicated,
> > > high capacity, digital service provided on terrestrial digital facilities
> > > capable of transmitting 1.544 Mbps. The interface to the customer can be
> > > either a T1 carrier or a higher order multiplexed facility."
> > >
> > > So, what do you think? To send data on this do we need to encapsulate it?
> > > You betcha, as Leo on TechTalk would say. That's why we have
> >"encapsulation
> > > frame-relay" and "encapsulation ppp," among others.
> > >
> > > Hope that helps a bit.
> > >
> > > Priscilla
> > >
> > >
> > >
> > > >On Wednesday, February 07, 2001 at 06:36:34 PM, Santosh Koshy wrote:
> > > >
> > > > > Pardon my ignorance here....
> > > > > Is there such a thing as just a "T1 Link"...
> > > > >
> > > > > of what I understand T1 / Frac T1 resides in the physical layer....
> >Dont u
> > > > > need something at the Data Link Layer (such as Frame Relay) before you
> >can
> > > > > enable IP or IPX at layer 3....
> > > > >
> > > > >
> > > > > _________________________________
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> > > > >
> > > > >
> > >
> > >
> > > ________________________
> > >
> > > Priscilla Oppenheimer
> > > http://www.priscilla.com
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