From: Fang Gao (fanggao@gmail.com)
Date: Sun Mar 02 2008 - 17:20:30 ARST
Hi,
Clock rate has no direct relation with data-rate. (I assume we just talk
about clock rate configuration on the serial port in Cisco routers).
Clock rate is used only on SERIAL port to feed on clock pin in order
to synchronize the data stream between DCE and DTE.
The serial port (V35 or RS232, or high-speed....) has separate pins for data
stream and clock. Clock-rate feeds the signal on Clock pin. The data go
through Tx/Rx data pins. They are not direct related. As long as DCE and
DTE are synched., the data will transmit over the serial connection.
You can choose any available clock rate (by "clock rate ?") to configure DCE
port.
BITS on Cisco 14545 optical switch is different story. BITS is used to sync
SONET or SDH optical devices. BITS uses T1/E1 as a timing source, similar to
NTP in cisco routers.
HTH
On Sat, Mar 1, 2008 at 10:41 PM, Radioactive Frog <pbhatkoti@gmail.com>
wrote:
> I have seen 2 megs station clock feed even the link speed was 6 megs using
> a
> HWIC2T cards.
>
> Check the specification of the HSSI port. IT takes 2 megs clock but can
> support port speed upto 52 megs.
>
> So ,.. still clock rate vs data-rate is unclear!
>
> Frog
>
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