[c-nsp] half duplex question

[Dave Weis]

If the half duplex circuit is plugged directly from one device to another device, how could you possibly have collisions without a hub somewhere in the mix?

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Tony Varriale
Sent: Wednesday, August 03, 2011 9:07 PM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] half duplex question

On 8/3/2011 3:56 PM, Nick Hilliard wrote:
>
> Nonsense.  With half-duplex, you'll get about 7-8 megs of traffic on the
> link before it starts petering out.  Collisions are a normal part of half
> duplex operation, so if you see a bunch of collisions in the interface
> counters, there's nothing to worry about.  It's excessive collisions that
> cause the problem.
>
> Nick
>
I was thinking he'd get about 12mbps full duplex out of that.  10mb 
(half duplex) x 2 (each way, half duplex) x 60% efficient = 12mbps.  The 
half duplexes cancel each other out.

tv
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