My understanding is that the CSU/DSU usually acts as both a DCE device and a
DTE device. Although depending on how you configure it, it can be any
combination.
Usually you configure it to provide clocking to your equipment (router) so
it is DCE to the router.
And, you usually configure it to accept clocking from the line coming from
the service provider, so it is DTE to the network.
So, normally the router is working with its default setting - DTE.
If you have routers in a test lab, or a back to back cable running under the
floor or something, you don't need a CSU/DSU, and you can configure one
router to provide clocking to the other.
Hope that helps,
Mike
>Hello Group,
>My Name is Rajgopal and I am based in Bombay,India.I have a question for
>you
>guys.
>I have read in the CCNA 2.0 Exam Certification guide by Wendell Odom that a
>DTE is the equipment that receives the Clocking information from a DCE
>which
>is the device that sends the clocking information for sync Links and at the
>same time he also says that a serial line comming from the ISP is connected
>to a CSU/DSU which in turn is connected to your serial port in the router
>and the CSU/DSU is the device which gives the clocking information for the
>sync links.
>Whereas the ICRC book says that by default the Cisco router is a DTE
>equipment and the minute we implement the clocking command on a particular
>serial interface then it becomes a DCE device.
>Correct me if I am wrong but for the clocking command to work on the
>enterprise side we have to enable the clocking command.Then does that
>interface become a DCE ??And if it becomes a DCE then doesn't it defy the
>rule that a DTE is connected to a DCE ??
>The ICRC book also says that in case if you don't have a CSU/DSU u have to
>use a back to back cable to connect the 2 routers and the interface on
>which
>u implement the clocking command becomes a DCE interface.But don't u think
>that its the ISP which gives u the clocking information??
>
>Please enlighten me on this subject as soon as possible because I have my
>CCNA exam on the 21st of Sept,2000 and I would like to be clear on as many
>concepts as possible.
>
>Many thanks and please help me out.
>
>Regards,
>Raj.
>
>P.s U can email me on the above mentioned address.
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