DSL Gotcha

[Matthew Carpenter]

David, you never cease to amaze me with your varied knowledge, since you seem
to have breadth and depth.  

begin  On Sun, 20 Jul 2003 17:57:06 -0500
"David A. Bandel" <david at pananix.com> wrote:

> On Sat, 19 Jul 2003 17:53:06 -0700
> "Net Llama!" <netllama at linux-sxs.org> wrote:
> 
> > On 07/19/03 17:43, Kurt Wall wrote:
> > 
> > > Hey, list,
> > > 
> > > I learned something interesting about DSL today. I was having lots
> > > or intermittency problems with my DSL connection. A call to tech
> > > support later, and it was fixed. Immediately. The solution: make
> > > the RJ11 cable from the wall jack to the modem as short as possible.
> > > The Ethernet cable can be as long as the protocol supports, but the
> > > RJ11 cable needs to be very short, or the connection will be
> > > unstable.
> > > 
> > > Go figger.
> > 
> 
> It's more a function of the quality of the RJ-11 cable and the
> connectors.  That said, RJ-11 cables you buy have very small guage wire
> which affects the signal.  The DSL works using ATM frames.  At approx
> 5.5km (roughly 3 miles), quality, as measured by signal speed, begins
> dropping off.  Signal quality is affected by all this and more.
> 
> I have a DSLAM installed (Lucent Stinger FS).  I test the lines
> initially by running them full open and letting someone connect.  If a
> short line (within the 5.5km) doesn't come up to 8Mb/1Mb, I know I'll
> have trouble with the connection regardless of the throttled speed (the
> closer to the throttled speed the original test was, the more trouble). 
> Poor connectors in the closets, knicked wires, all make for problems. 
> ATM is a PITA (and a POS too).  Stay as far away from it as possible
> (let the telcos worry).
> 
> Ciao,
> 
> David A. Bandel
> -- 
> Focus on the dream, not the competition.
> 		Nemesis Racing Team motto
> GPG key autoresponder:  mailto:david_key at pananix.com
> 


-- 
Matthew Carpenter
matt at eisgr.com                          http://www.eisgr.com/

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