You may wish to check out www.itprc.com. Look under the 'physical' and 'data
link' sections..dj
"Talib" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Is there a website where there are basics and details about ISDN, DSL,
Cable and T1s?
>
>
> Zhiping Li wrote:
>
> > Hi,ciscoer:
> >
> > when I study cisco ccnp,
> > I always find CSU/DSU,
> > what are them?
> > what are their use?
> > Are they some kind of MODEM?
> > thanks .
> >
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