Sound like you need a DCE cable for your the router  :)
Take a close look at your cable or use the "show controllers Serial 0" to
verify you have the right one.
http://www.cisco.com/univercd/cc/td/doc/pcat/se____c1.htm



""Eric ding"" <[EMAIL PROTECTED]> wrote in message
984kvl$3dk$[EMAIL PROTECTED]">news:984kvl$3dk$[EMAIL PROTECTED]...
>   two 2500 routers,routerA and routerB, back-to-back connection .both of
> them use  serial 0,when i set routerA's serial for dce,i got the output
> below:
> routerA(config-if)#dce-terminal-timing-enable
> %not allowed on dte interface
> but if i use the command below:
> routerA(config-if)#no dce-terminal-timing-enable
> routerA(config-if)#dce-terminal-timing-enable
> it does work.
> i was confused about it!
> any suggestion will be appreciated!
>
>
>
>
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