802.11G health issue and home network cabling question

R

Rod Speed

(e-mail address removed) wrote
Whether _you_ might need it or not, the National Electrical Code used
in the USA does specify a minimum of outlets distributed around.
Yes.

You can expect to find wiring pretty much on any wall wider than 2 feet.
Click to expand...

Oh bullshit. And what I meant is that the power outlets will be obvious,
so you only need to be careful where there are power outlets. There is
very unlikely to be any power wiring where there are no power outlets
particularly when you are mounting the cat5/6 outlets well up from the floor.
 
J

Jeff Liebermann

decaturtxcowboy said:
Dmitri is so right! Customer did his own "cleanup" and stapled his CAT5
cable with an Arrow T-25 staple gun. I went back and did a cable test
and it wouldn't even pass CAT3 10 Mbps. Her didn't short out any pairs,
just crushed them to the point there were too many impedance bumps.
Click to expand...

Are you sure about that? I got into an argument about the proper
spacing of Arrow T25 type staples. One expert said that they should
be as close together as necessary to prevent droop. Another
suggested, that too many staples would fail certification. My guess
is that there would be problems only if they punctured the bundle.
Everyone was wrong.

So, we tried it. I took a 4ft x 4ft chunk of plywood and stapled
about 50ft of CAT5e in a serpentine pattern to the plywood. I started
with staples every inch but when both hands finally started to hurt, I
switched to about 2" spacing. My guess is about 300-400 staples
total.

The plywood was not very consistent and I did flatten the cable with
about 30-50 staples. I also nicked the jacket a few times, but no
punctures.

We tested the mess with a (borrowed) Fluke DSP-4000 Cable Analyzer. No
problems passing at 100Mbits/sec.
Lowes carries a new staple gun designed for network cables and coax with
special plastic insert staples.
Click to expand...

Arrow T59A or T75. Kinda expensive, projecting, and UGLY.
| http://www.arrowfastener.com/FMPro?...ct.html&-lay=Entry&-Op=Equals&item=T59&-find=
Velcro® is your friend....
Click to expand...

I prefer duct tape, RTV, spackle, and plastic wood. Great for hiding
my mistakes.
 
D

DLR

johns said:
You want nice looking wall ports, and that can be a stinker
to install. They need to be attached to studs, and that can
mean cutting out a fair piece of sheet rock, and then repairing
that. Also, it is not easy to go sideways in a wall. Talk to
some pros, and get a price.

johns
Click to expand...
That's an interesting opinion about needing wall stud attachment and may
even be code in some places but it's not a majority view. Even among "pros".

Home Depot and Lowes both now carry the "orange" old work boxes for
doing this without stud attachment. They work quite well and unless you
mess up, no sheet rock repair required.
 
R

Rico

Are you sure about that? I got into an argument about the proper
spacing of Arrow T25 type staples. One expert said that they should
be as close together as necessary to prevent droop. Another
suggested, that too many staples would fail certification. My guess
is that there would be problems only if they punctured the bundle.
Everyone was wrong.

So, we tried it. I took a 4ft x 4ft chunk of plywood and stapled
about 50ft of CAT5e in a serpentine pattern to the plywood. I started
with staples every inch but when both hands finally started to hurt, I
switched to about 2" spacing. My guess is about 300-400 staples
total.

The plywood was not very consistent and I did flatten the cable with
about 30-50 staples. I also nicked the jacket a few times, but no
punctures.

We tested the mess with a (borrowed) Fluke DSP-4000 Cable Analyzer. No
problems passing at 100Mbits/sec.


Arrow T59A or T75. Kinda expensive, projecting, and UGLY.
|
http://www.arrowfastener.com/FMPro?-db=web.fp5&-format=product.html&-lay=Entry
&-Op=Equals&item=T59&-find=


I prefer duct tape, RTV, spackle, and plastic wood. Great for hiding
my mistakes.
Click to expand...

You make mistakes? Say it ain't so, Joe (err Jeff) <wink/>

fundamentalism, fundamentally wrong.
 
J

JAD

T. T. said:
Hi dear all:

Recently after reading some articles I have some concerns about 802.11G
WLAN health issue:
http://arstechnica.com/news.ars/post/20060222-6235.html
http://www.netstumbler.org/archive/index.php/t-12052.html

Is Wifi or WLAN verified to have some health issues with humans? We
have a baby (13 months) at home so we really don't want to take any
risk.
Click to expand...

Everytime the wife gives me grief about layin round getting nothing done, I
blame the wireless and its effects on health.
 
J

Jeff Liebermann

(e-mail address removed) (Rico) hath wroth:
You make mistakes? Say it ain't so, Joe (err Jeff) <wink/>
Click to expand...

I prefer "Jack D. Repair". I once made some business cards with that
name on it. I didn't work as expected because too many people didn't
understand the pun.

I recently installed an extra PVC pipe on the wall behind my relay
rack full of radio junk to the roof. My other conduits were maxed out
full of coax cable, CAT5, fiber, RG-6/u, rotator cable, wx station
cable, signal wire, etc. The standard procedure is measure twice, cut
once. That works fine, but not while getting interrupted every few
minutes by obnoxious friends with computah problems. I missed
drilling by about 1/4" into the wall. Argh. I had planned to use
a 1 1/2" PVC pipe, but that won't work partially buried into the wall.
So, I dug out the jig saw, enlarged the hole to fit a 2" PVC pipe,
mounted the pipe, and patched the mistake with spackle, plastic wood,
and roofing tar. Nobody will ever know unless I show them.

Like I said... I hide my mistakes.

To err is human and I need to reassure myself occasionally.
 
D

decaturtxcowboy

Jeff said:
Are you sure about that? I got into an argument about the proper
spacing of Arrow T25 type staples.
Click to expand...

The network card LAN lights lite up, and no shorts and good continuity
in all the pairs. It was a 150 ft run. I suppose one could try to
duplicate it with some very very tight skinny nylon wire ties and see
what happens.

Nevertheless, that was indeed an interesting you tried.
 
J

Jeff Liebermann

decaturtxcowboy said:
The network card LAN lights lite up, and no shorts and good continuity
in all the pairs.
Click to expand...

Ok. If you had continuity (and not split pairs), then all that's left
is crosstalk and reflections.
It was a 150 ft run. I suppose one could try to
duplicate it with some very very tight skinny nylon wire ties and see
what happens.
Click to expand...

Pass. My hands were a wreck after about 200 staples. I couldn't play
piano for 2 days. If I'm going to do nylon cable stranglers, then
I'll see if I can borrow a pneumatic cable tie tool.
Nevertheless, that was indeed an interesting you tried.
Click to expand...

I got inspired by TV's "Myth Busters". I like to do technical urban
legend type of tests. I didn't do these photos but they show that the
common guesswork for losses in coax adapters at 2.4GHz is way too
high. All those connectors only contributed 2.1dB of loss at 2.4GHz
or about 0.09dB per connector pair.
| http://802.11junk.com/jeffl/antennas/connector-loss/
| http://groups.google.com/group/alt.internet.wireless/browse_frm/thread/ac0cd3fadf7be8fb

I have some others but I don't wanna start yet another arguement.
 
R

Robert Redelmeier

In comp.dcom.cabling decaturtxcowboy said:
The network card LAN lights lite up, and no shorts and
good continuity in all the pairs. It was a 150 ft run. I
suppose one could try to duplicate it with some very very
tight skinny nylon wire ties and see what happens.
Click to expand...

No insult, but are you sure you didn't split pairs?
That usually gives lights & continuity, but no signal.

Other than that, I've heard _uniform_ stapling can create
a "notch filter".

-- Robert
 
D

decaturtxcowboy

Robert said:
No insult, but are you sure you didn't split pairs?
That usually gives lights & continuity, but no signal.
Click to expand...


Heavens no..no insult taken, but always good to offer another
suggestion. Anyway, pairs were good.
 
D

DLR

Robert said:
No insult, but are you sure you didn't split pairs?
That usually gives lights & continuity, but no signal.

Other than that, I've heard _uniform_ stapling can create
a "notch filter".
Click to expand...
I'm reaching way back into some distant memories for this and I may be
wrong but given that 300MHz is a 1m wavelength I think you in effect
made a STP cable. You'd want to space out the staples much more than 1"
or 2" for this test.
 
G

glen herrmannsfeldt

Jeff Liebermann wrote:

(snip)
I got inspired by TV's "Myth Busters". I like to do technical urban
legend type of tests. I didn't do these photos but they show that the
common guesswork for losses in coax adapters at 2.4GHz is way too
high. All those connectors only contributed 2.1dB of loss at 2.4GHz
or about 0.09dB per connector pair.
Click to expand...

Some time ago I thought about testing 10baseT with a common mode
240VAC signal, but I never got around to actually doing it.
That would be pretty convincing that you don't have to worry
about nearby power cables.

-- glen
 
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