From: OhioHondo (ohiohondo@columbus.rr.com)
Date: Thu Jan 02 2003 - 17:34:10 GMT-3
Esther
You can't run mis-matching Ethernet speeds on a baseband Ethernet Hub. You
need an Ethernet switch or some device that has the ability to store frames
and makes the speed conversion. An ethernet switch that supports 10, 100 or
Gig speeds does this. A 10 Meg Ethernet hub or a 100 Meg Ethernet hub does
not.
Note -- a router between a 10 meg ethernet hub and a 100 meg ethernet hub
also makes the conversion. Look at one of the CCNP books on switching.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Chuck Church
Sent: Thursday, January 02, 2003 9:47 AM
To: esther; ccielab@groupstudy.com
Subject: Re: Ethernet sampling
Esther,
The 'S' in SONET stands for synchronous, meaning that both sides need to
operate at the same exact speed to determine when a frame starts and stops.
So it has a strict length and time assigned to it. Ethernet is asynchronous
physically, as the Ethernet spec specifies an inter-frame gap between
frames, which allows stations to know when one frame ends and another
begins. The preamble in Ethernet also helps stations sync for an incoming
packet. As far as speed differences, Manchester encoding at a specific
megahertz is used. They've increased the speed of the encoding over the
years, as the mediums used (copper, fiber) have improved. This is all off
the top of my head, so you might want to check the RFCs (IEEE) to be
positive. HTH.
Chuck Church
CCIE #8776, MCNE, MCSE
----- Original Message -----
From: "esther" <esther1616@hanmail.net>
To: <ccielab@groupstudy.com>
Sent: Thursday, January 02, 2003 4:38 AM
Subject: Ethernet sampling
> Hi everyone,
>
> In case of the SONET framing, should be smapling 8000 times per sec.
> Then, what about the Ethernet 10M, 100M, 1G, and 10G respectively?
> Bassically all ethernet technologies are using the same frame format.
> then how can bring the different bandwidth such as the 10M, 100M, 1G and
> 10G. I think it should be on the frequency of the frame sampling per sec.
> is there any fomular on the frequency of the frame sampling?
>
> Thanks for anyone can explain ...
>
> Esther.
>
> [TABLE NOT SHOWN][TABLE NOT SHOWN][IMAGE]
> .
.
.
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