Question about Cisco 2610XM Router

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Cisco 1721 router serial port not showing any loop.

Sir...i have cisco 1721 router. i have connected serial 0 port to 64 kbps modem and serial 1 to another 64 kbps both modems are connected back to back by 4 wire...but the serial ports are showing "serial up,line protocol down". and it is not showing any loop given from modem..configurations are correct modem also fine.router also showing serials ports connecting where is the problem...

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  • pradip1069 Mar 24, 2009

    hi ,

    I have Cisco 1721 router.On modem line showing ok but in router line protocol showing down

    Please Help?

    Thanks& Regard,


  • Noe Lana
    Noe Lana May 11, 2010

    can you please paste here the interface of s0?


  • lanmster54
    lanmster54 May 11, 2010


    Are you using the same 4 or 8 wire cord to the demarc for both modems? It may seem obvious, but...




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The problem is with your modem....did you tested the local loop from router to modem....are u getting local loop from one modem till router or not...try first checking local loop from modem to router...

Posted on Feb 11, 2009


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