Used in the context of data transfer, wire-speed means the maximum rate at the physical
medium can accomplish the data transfer. What determines this is mainly the physical
medium's capabilities (bps rate or number of bits per second) and minimum packet
size.
Wire-speed processing means that the interface can process each packet at the maximum
packet arrival rate. Maximum transer rate is not always available depending on the
design of the connector, the physical condition of the connector (dirty,
cross-threaded), the interface software driver's capability or configuration, how busy
the router's CPU is, etc. I'm probably leaving out something but you get the idea.
Be careful about the use of the term "bandwidth" when talking about Cisco routers. The
IOS keyword "bandwidth" is used to inform routing protocols (and other processes) about
the effective speed of an interface (physical or logical) and may not reflect actual
line speed. In phyics, bandwidth is defined as the range of frequencies that a signal
occupies on the media. In networking Andy is correct - it usually refers to how fast
data is flowing which is pretty close to wire speed if you ignore overhead bits (sync
and so forth).
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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