Hi all,
Believe me when I say wire does not move. The wire rate is ZERO. It usually sits in
a wall.
The clock speed in a synch type circuit dictates the rate at which bits change the
state of a wire.
Electricity in pure theory does not travel along the wire nor does light in the purest
sense. I know it does but for the poing of excerise when we lift the signal on a wire
from 0volts to 5volts we do so at both ends. In reality about 70-90% of the speed of
light.
The capabilty of the wire is restricted to the cable design, the noise the signal
strength etc.
The clock rate sets up a timing thingy that tells the remote end when to measure a
pulse on the line. It is therefore imperitive that only one end drives this timing.
All communications devices use some method.
If you look at the BCRAN Book (Cisco Press) Catherine Paquet. She shows a pretty good
example of how the clocking is done in an ISDN service. (I think but my memory is
slipping)
The clockrate is quite simply a timing device set by a master to tell the slave when
to measure the signal on the wire.
Teunis,
Hobart, Tasmania
Australia
On Wednesday, December 13, 2000 at 01:25:21 PM, Andy Walden wrote:
>
> 56000
>
> and I'm pretty sure wire-rate is the rate you can push data across the
> wire, so yes. when people say wire-speed, they mean without latency
> usually.
>
> andy
>
> On Wed, 13 Dec 2000, Pierre-Alex wrote:
>
> > So if your bandwidth if 56Kb/s what will be your clock rate.
> >
> > Do you need to have them exactly set equal (bandwidth and clock rate)
> >
> > I still need a definition of wire rate. Is it the same thing as bandwidth?
> >
> > Thanks
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> > Andy Walden
> > Sent: Wednesday, December 13, 2000 10:43 AM
> > To: Pierre-Alex
> > Cc: Cisco
> > Subject: Re: Clock Rate Wire Rate Bandwidth
> >
> >
> > >
> > > 0. How do you choose the clock rate on an serial interface?
> >
> > clock rate 64000 for instance. the clock rate is only configured on the
> > dce.
> >
> > > 1. What is the relationship (if any) between the wire rate and the clock
> > > rate?
> >
> > the clock rate is the number of bits that can be transmitted in a
> > second. this equals your bandwidth.
> >
> > > 2. What is the relationship if any between the clock rate and the
> > bandwidth?
> >
> > same as above.
> >
> > > 3. How could clock rate speed be "gentle on cables"? (See archive bellow)
> >
> > I have no idea what he means by gentle on the calbes unless he was using
> > old cat-3 that was error prone. the running less traffic for debugs makes
> > sense as you as a human can only process so much intelligently.
> >
> > andy
> >
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