From: Forest Riek (forestr@xxxxxxx)
Date: Thu Oct 26 2000 - 13:49:56 GMT-3
Mark,
Jiang is correct about the clock rate for a physical serial interface with a
external cable (EIA-232 or V.35) attached.
To 'muddy' the water, on a internal CSU/DSU (DS1/DS3 - ie a WIC/VWIC, NM or PA)
you
can configure the clock source as either line or internal. If you set it to
internal, you will need to set the clock speed. This is important to know if y
ou
are working with a point-to-point circuit provisioned by a telco. On such a
circuit, they do not provide a clock.
Forest
Guoxing Jiang wrote:
> Hello mark,
>
> You can't config a clock rate on a DTE cabled interface, it must be
> configed on the DCE cabled interface. Anyway, just like allyn
> wrote,the physical DCE or DTE has nothing with the interface type DCE
> or DTE. For example, you connected two routers back to back through
> serial interface, you must config the clock rate on the DCE cabled
> side. But if you using frame relay encapsulation. you can config
> "fram-relay intf-type dce" on either side, not just on the DCE cabled router.
>
> jiang
>
> Thursday, October 26, 2000, 2:17:20 AM, you wrote:
>
> ms> I beg to differ. I have tried to use the clock rate command on an
> ms> interface with a DE cable and got an error message about wrong cable
> ms> type. Have you been able to successfully configure a clock rate on a
> ms> DTE cabled interface.
>
> ms> Allyn Baskerville wrote:
> >>
> >> There are two "types" of DCE interfaces. One is defined by the cable that
is
> >> attached to the router, and the other is by the interface type required by
> >> the encapsulation. For example, two routers connected back-to-back
> >> configured for frame relay require "frame-relay intf-type dce" on one end
> >> and a "frame-relay intf-type dte" on the other. This has nothing to do wi
th
> >> the physical cable connection and consequently clocking. So you can speci
fy
>
> ms> Mark Salmon
> ms> Network Support Engineer - SBC OP HQ
> ms> Cisco Systems Inc
> ms> 8735 W. Higgins Road Suite 300
> ms> Chicago IL 60631
> ms> Phone:773-695-8235
> ms> Pager:800-365-4578
> ms> email: masalmon@cisco.com
> ms> Empowering The Internet Generation.
>
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