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Old 01-23-2008, 09:02 AM
Bod43@hotmail.co.uk
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Default Re: Long cat5 run question

Jerff said:

> Note that the 100meter limit is between switches. *You can add as many
> ethernet switches as needed along the line to deal with regenerating
> the signal. *I've done 1500ft that way with 3 switches between
> endpoints. *I think that's about the limit as it was a bit flakey when
> the switches got hot. *I think (not sure) that the limit is set by the
> end to end latency (delay), which causes ACK timing problems.


The 802.1d standard says 7 (or it is 8?) intermediate
switches however that limit is for the Spanning Tree
Protocol and if you were not using redundant
paths managed by STP then there is no reason
to stick to it.

Of course you could use routers and add an arbitrary
number of hops. There are fewer now however at one
time it was not unusual for internet paths to have 25
router hops (and an unknown number of switchhops).

Each hop will add 2 x Transmission Delay to the
RTT. Say 2ms at 10M for full size packets.


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