WTF! Troll!
Zhiping Li <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> 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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