[c-nsp] Max length of 9600 serial over CAT5e

[Richard Halfpenny]

Sam Stickland wrote:
>  Hi,
>
>  What's the maximum length of you can run async-serial (9600 baud)
>  over CAT5e (from a terminal server to console port).
>
>  My google-fu has failed me.

If I remember correctly, the spec for RS-232 says the maximum 
capacitance of a cable can be 2500pF at 20kbps.  A Cat5e of approx 46pF 
/ metre would give you a maximum length of 54 metres.  At 9600bps you 
could probably drive slightly longer.

Rich

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Network Operations
Exa Networks Ltd :: AS30740
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