RE: console over modem?

G'day Mike,

Actually, with properly balanced audio, you ground both ends.  (I happen to be a sound engineer and have wired a few cables and studios in my day...)

--

http://hiltont.blogspot.com/

Regards,

Hilton Travis                       Phone: +61 (0)7 3105 9101
(Brisbane, Australia)               Phone: +61 (0)419 792 394
Manager, Quark IT                   http://www.quarkit.com.au
         Quark Group                http://www.quarkgroup.com.au

     Microsoft SBSC PAL (Australia) http://www.sbscpal.com/

War doesn't determine who is right.  War determines who is left.


> -----Original Message-----
> From: Jewell, Michael [mailto:[email protected]]
> Sent: Tuesday, 19 May 2009 22:22
> To: [email protected]
> Subject: RE: [m0n0wall] console over modem?
>
> It should be noted that you should only ground one end of the cable,
> just like in balanced audio, you could get some pretty nasty AC hum's
> if you ground both ends...
>
> -Mike
>
> ________________________________
>
> From: Claus@Monowall [mailto:[email protected]]
> Sent: Tue 5/19/2009 3:26 AM
> To: Wayne Fiori
> Cc: [email protected]
> Subject: RE: [m0n0wall] console over modem?
>
>
>
> Normally I connect RTS, CTS, RX, TX as one conductor en each pair and
> connect the 4 other conductors in the pair to GND.
>
> GREEN           RX
> WHITE(GREEN)             GND
> BLUE                     TX
> WHITE(BLUE)              GND
> ORANGE                   RTS
> WHITE(ORANGE)            GND
> BROWN                    CTS
> WHITE(BROWN)             GND
>
> This configuration lets me run 115200 over 80m in normal server-room
> conditions.
>
> Claus
>
> -----Original Message-----
> From: Wayne Fiori [mailto:[email protected]]
> Posted At: Tuesday, May 19, 2009 8:05 AM
> Posted To: Monowall
> Conversation: [m0n0wall] console over modem?
> Subject: Re: [m0n0wall] 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
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: [email protected]
> > For additional commands, e-mail: [email protected]
> >
> >
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: [email protected]
> For additional commands, e-mail: [email protected]
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: [email protected]
> For additional commands, e-mail: [email protected]
>
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: [email protected]
> For additional commands, e-mail: [email protected]


This document and any attachments are for the intended recipient only.
It may contain confidential, privileged or copyright material which
must not be disclosed or distributed without prior approval.

Quark Group Pty Ltd  ::  ABN 23 114 975 772
Trading As Quark AudioVisual, Quark Automation, Quark IT