From: Jon Carmichael (jonc@xxxxxxxxxxx)
Date: Fri May 18 2001 - 20:53:20 GMT-3
You're totally missing something. There is only ONE clock on a circuit!
That clock is usually provided by the carrier, --but rarely it could be
generated by one of the DSUs. If there are two clocks on a circuit, --it
makes a lot of trouble, usually a flapping line, --or flat out does not work
at all. A router connected to a DSU has a DTE interface which can only
recover (not generate) clock, and the source of the clock is the DSU, --this
is ALWAYS the way it is. However it's possible the that DSU is the source
of the clock and not the carrier. If the carrier is making the clock, then
both DSUs and both routers are recovering the carrier's clock. If ONE of
the DSUs is making clock, --then the carrier isn't, --or rather better not
be.
JONC
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Jeongwoo Park
Sent: Friday, May 18, 2001 4:14 PM
To: ccielab@groupstudy.com; Jay@West. Net
Subject: clocking source at router
hi all
Shouldn't router's source clocking be configured depending on csu/dsu's
source clocking?
For example, csu/dsu's source clocking was configured as internal. Then what
type of clocking source should the router that is directly connected with
this csu/dsu have?
Should this router have line or internal or something else?
Or am I totally missing something?
thanks in adv
oh, one more thing that pops out of my head..
I have seen a router 1740 that has csu/dsu module within the router. Then
what is the deal in this case?
jp
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