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This Question is Not Answered 1 Correct Answer available (4 pts) 2 Helpful Answers available (2 pts)
9195 Views 13 Replies Latest reply: Dec 13, 2014 10:12 PM by Parvesh RSS

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Clock Rate - DCE to DTE

Jan 17, 2011 8:54 AM

Areyes1008 32 posts since
Dec 22, 2009

What does the clock rate, higher or lower do in a serial connection?

  • Aaqil Akhtar 1 posts since
    Jan 17, 2011
    Currently Being Moderated
    1. Jan 17, 2011 9:01 AM (in response to Areyes1008)
    Re: Clock Rate - DCE to DTE

    clock rate is used for DCE connection.

    whenever you connect two serial port u have to give make one port end DCE and second one is DTE.So clock rate is given to the DCE to communication.

    by default it is 64000

    #clock rate 64000

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  • angelo 96 posts since
    May 27, 2010
    Currently Being Moderated
    2. Jan 17, 2011 9:09 AM (in response to Areyes1008)
    Re: Clock Rate - DCE to DTE

    The clock rate defines the speed of the link. This is supplied by your telco.

    The only time you'll probably ever need to define the clock rate is in a lab environment.

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  • sabari 23 posts since
    Oct 2, 2012
    Currently Being Moderated
    4. Dec 4, 2014 12:37 AM (in response to angelo)
    Re: Clock Rate - DCE to DTE

    then while i am in the way to configure router DCE what sould i do exactly? default 64000 or any other extra effert to know about that?

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  • Aref 4,355 posts since
    Nov 29, 2011
    Currently Being Moderated
    5. Dec 4, 2014 1:38 AM (in response to sabari)
    Re: Clock Rate - DCE to DTE

    Hi Sabari,

     

    If you are on a lab, then you would set the maximum supported speed. You would verify the DCE end by issuing the command "sh controllers serial <the-int-name>" and then set the clock rate under that interface by using the command "clock rate...".

     

     

    Regards,

    Aref

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  • Currently Being Moderated
    6. Dec 5, 2014 4:22 AM (in response to Aref)
    Re: Clock Rate - DCE to DTE

    can it cause troubles configuring higher clock rates ??

     

    ISRs' support this kind of clocking automatically, right ?

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  • Aref 4,355 posts since
    Nov 29, 2011
    Currently Being Moderated
    7. Dec 5, 2014 10:33 AM (in response to Parvesh)
    Re: Clock Rate - DCE to DTE

    Hi Parvesh,

     

    Are you meaning in LAB environment?, if so, you can do it, but if you are meaning on a real connection then you should set the exact clock rate supplied by your ISP.

     

    A router would give you the supported clock rates based on the serial card model, example:

     

    Router#sh inve
    NAME: "chassis", DESCR: "1841 chassis"

     

    NAME: "WIC/HWIC 0", DESCR: "WAN Interface Card - Serial (1T)"
    PID: WIC-1T=           , VID: 1.0, SN: xxxxxxxx

     

     

    Router(config-if)#clock rate ?
            Speed (bits per second)
      1200
      2400
      4800
      9600
      14400
      19200
      28800
      32000
      38400
      48000
      56000
      57600
      64000
      72000
      115200
      125000
      128000
      148000
      192000
      250000
      256000
      320000
      384000
      500000
      512000
      640000
      704000
      768000
      800000
      1000000
      1024000
      1200000
      1536000
      2000000
      4000000
      8000000

     

      <300-8000000>    Choose clockrate from list above

     

     

    Regards,

    Aref

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  • Currently Being Moderated
    8. Dec 6, 2014 5:40 AM (in response to Aref)
    Re: Clock Rate - DCE to DTE

    ISR does CLOCK RATE automatically 

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  • sabari 23 posts since
    Oct 2, 2012
    Currently Being Moderated
    9. Dec 6, 2014 8:41 PM (in response to Aref)
    Re: Clock Rate - DCE to DTE

    if the ISP gives 64000 cloc rate then i should apply exactly 64000 while configuring. am i correct? what is the clock rate nowadays provided by ISP? is that commonly given to all WAN link? and any diffence isp to isp?

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  • Aref 4,355 posts since
    Nov 29, 2011
    Currently Being Moderated
    10. Dec 7, 2014 2:58 AM (in response to sabari)
    Re: Clock Rate - DCE to DTE

    Hi Sabari,

     

    Yes you should apply the exact rate given to you by ISP. I'm not that good with that old technology, but I think nowadays that technology is almost gone.

     

     

    Regards,

    Aref

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  • sabari 23 posts since
    Oct 2, 2012
    Currently Being Moderated
    11. Dec 7, 2014 5:30 AM (in response to Aref)
    Re: Clock Rate - DCE to DTE

    fine.mr.aref k. so clock rate coommand is old techmolgy now because it is defaultly provided in real time.but it is neccessory in lab. right?

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  • Aref 4,355 posts since
    Nov 29, 2011
    Currently Being Moderated
    12. Dec 7, 2014 2:00 PM (in response to sabari)
    Re: Clock Rate - DCE to DTE

    Hi brother,

     

    Not the command in itself, I meant the technology on which is being used (serial connections). I think we do still deal with it because it would be required for all certificates tracks.

     

     

    Regards,

    Aref

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  • Currently Being Moderated
    13. Dec 13, 2014 10:12 PM (in response to Aref)
    Re: Clock Rate - DCE to DTE

    Yes Aref, now a days, with ISR routers, you dont have to provide clock rates. It is auto now.

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