Re: console over modem?

Considering the difference in data rates and signaling, re ethernet
versus serial, the wire pair twists are not important in the serial
cable. They are important for ethernet however. But even at 9600 baud,
a 15m cable is pushing the length limits.
--
=Wayne


On Mon, May 18, 2009 at 10:54 PM, Mohammed Ismail <[email protected]> wrote:
>
>
> -----Original Message-----
> From: Wayne Fiori [mailto:[email protected]]
> Sent: Tuesday, May 19, 2009 7:51 AM
> To: [email protected]
> Subject: Re: [m0n0wall] console over modem?
>
> The rule of thumb is 15m (or 50ft) before you start to loose line
> rate. The best way to go is a DB-9 to RJ45 adapter. Use a straight
> ethernet cable and do all the pinouts on the adapter
> (http://www.commdevices.com/pdf/null-modem-rj45-db9-pinout.pdf)
> --
> =Wayne
>
>
> =========================
>
> This says the same while using high quality cable.
> http://www.connectworld.net/cable-length.html
>
> also I guess Tx,RX should be on the same pair of cables inside the cat
> cable.
> Just like the Ethernet
> 1 2 3 6   each two in a pair.
> If we did not do it like that, we start to loose rate after 25m on regular
> Ethernet network.
> I have been told that twists do some thing to reduce resistance!
> Any idea?
>
> Mohammed
>
>
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