>I think this is actually more of a CCNP troubleshooting question. Think
>about the type of media you're dealing with. Collisions happen on media
>that allow multiple devices to speak at the same time. If the media or
>topology does not allow multiple access then you cannot have
>collisions.
>
>On most serial links, you are running full duplex with only two
>devices. This makes it impossible to have collisions. They just don't
>apply in this situation. Heck, even in situations where you can run
>half-duplex serial I don't know what happens when both stations transmit
>at the same time. I've never personally experienced a half-duplex
>serial link, I've just heard that they exist.
Count this lack of experience among your blessings...especially if
your lack of experience was with 2000 or 2400 bps multidrop.
Polled multidrop is very much like token ring, except where the token
control is distributed in the LAN, it is centralized in the mainframe
or front end processor (although Cisco routers can poll).
Unfortunately, there was much more of a chance that an individual
modem or host would decide to transmit when it wasn't being polled,
or would fail to "release the token."
>
>HTH,
>John
>
>>>> "Wright, Jeremy" 8/23/01 2:31:12 PM >>>
>Can you have collisions on a serial link? Thanks again.
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