I think it can be summarised as such if the modem is providing clocking to
the router then modem is the DCE device router is the DTE device whereas as
in the case of the lab scenario where we do not have a modem then we need to
join two routers together to simulate a WAN link then for the virtual WAN
link to work one of the routers need to provide the clocking . The router
which provides the clocking is the DCE device while the router which
receives the clocking is the DTE device . To find which router is the one
suppose to provide the clocking do a sh controllers s0 or s1 to check which
is running DCE or DTE
hope this helps
Jason
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Rajagopal Iyengar
Sent: Tuesday, September 19, 2000 11:58 AM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: Clocking Question
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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