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From: janii on 25 Jun 2010 09:44
In a typical serial protocol, when mutiple nodes attempt to access the bus
at the same time, a collison may occur, what is this collison exactly
mean?

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From: Tim Wescott on 25 Jun 2010 10:58
On 06/25/2010 06:44 AM, janii wrote:
> In a typical serial protocol, when mutiple nodes attempt to access the bus
> at the same time, a collison may occur, what is this collison exactly
> mean?

It means that both transmitters put data on the bus at the same time,
and the result is garbled and useless.

--
Tim Wescott
Control system and signal processing consulting
www.wescottdesign.com
From: AZ Nomad on 25 Jun 2010 11:02
On Fri, 25 Jun 2010 08:44:07 -0500, janii <amernaseem(a)n_o_s_p_a_m.rocketmail.com> wrote:
>In a typical serial protocol, when mutiple nodes attempt to access the bus
>at the same time, a collison may occur, what is this collison exactly
>mean?

two devices talking at the same time. rather simple concept.
From: D Yuniskis on 1 Jul 2010 15:34
Hi Tim,

Tim Wescott wrote:
> On 06/25/2010 06:44 AM, janii wrote:
>> In a typical serial protocol, when mutiple nodes attempt to access the
>> bus
>> at the same time, a collison may occur, what is this collison exactly
>> mean?
>
> It means that both transmitters put data on the bus at the same time,
> and the result is garbled and useless.

Unfortunately, unless your protocol deliberately precludes
(or otherwise addresses) this possibility, it is possible
that some nodes *can* see "somewhat" valid transactions on
the bus (depends on topology).
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