Re: Newbie network wiring help

In article <1146598565.724206.316750@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
Peter <peter@xxxxxxxxxxxxxxxxxxxxxx> wrote:
To Jean-Pierre,
many thanks, I had seen that particular diagram but it was the daisy
chain info which had been escaping me.
If I understand correctly, I run my first cable from the patch panel to
the first socket, I then take a second cable which is paired and
punched down into the same slots as cable one, this then runs to socket
two where we repeat again with another cable than runs to socket 3 and
so on down the line?
regards
Peter

And let me caution you about being extremely careful with
punch-downs so that you don't ever get them crossed.

A few years back when I was sending out a dozen or so T1's
providing internet services for a small CLEC that provided service
only for commercial accounts [some rathter large], one of their
customers decided they'd get the IP services from them instead of
where-ever they got it before.

It almost worked. And the head-engineer at the little Telco and I
started trouble shooting.

The first thing was to loop the smart-jack connected to CSU/DSU.
I could loop there. Then the next link, success. This went on
through about 10 to 15 points, down to the smart-jack at the
customers premises.

With the telco, the customer and myself all on the line at the same
time the client was getting some response, but I could see nothing
coming back.

Finally Les [the telco person] had them cut-off the RJ-45 jack
and twist the wires together. I could then loop-back into the palm
of their hand. They had swapped two-wires. That only took about
4 hours - and it was only a 20 mile link!! And there were 4 of
us, because the customer had two people there - which may have been
the cause of the screwup - and they had punched down at the 110
block with about 50 feet of cable with the RJ-45 on the far end
connected to their Cicso. Gawd I'm glad I don't have to do that
stuff anymore.

It is so easy to make a mistake like that and see things almost
work that you overlook the little things.

If you aren't SURE - it might be best to have smoeone who does this
for a living handle the wiring. There is so much of it done it's a
lot cheaper now than it used to be.

And as to your idea of daisy chaining at each connection, that will
be sure to fail. All the nnBaseT type connections use the
home run approach - all wires go back to the start - or to
intermediate hubs. [I recomend that you use switches as they are
so cheap].

And if you use hubs you have to be sure you stay within length
limits to ensure you can probe for use correctly to avoid
collisions that require retransmission.

WIth hubs you can get by with 4-wire and half-dupplex but to do it
correctly you really need to run 8-wire, full-duplex with switches.

Doing it right the first time will save a lot of trouble-shooting
time in the future.

Bill

--
Bill Vermillion - bv @ wjv . com
.

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