It depends on what your serial port is connected to.  Is it frame relay, 
CSU/DSU, etc.

>
>Hello to All,
>
>If Serial0 is up, line protocol is down, then what should I check? Give me 
>as many answers as you can.
>
>BTW what  is the line protocol? is it a network protocol like ip, ipx? or 
>is it the data link layer protocol?
>
>Omer

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