LAN and Telecom Cabling Homemade cat5 cable using existing phone line fails.

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Subject Author Date
Homemade cat5 cable using existing phone line fails. Sam Nickaby 03-11-06
Posted by Robert Redelmeier on March 12, 2006, 10:16 am
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>>I've used cat 3 (ordinary flat telephone extension cable) for a 100' run,
>>with cat 5 (RJ-45) connectors at each end - but I had to pay attention
>>to which pins I hooked up:
>
> Flat telephone cable (silver satin) isn't Cat-3 cable. It
> would be known as voice-grade, rated good for maybe
> 5kHz. Cat-3 cable is round, looks just like cat-5 normally,
> just not as many twists per inch.

> It also depends alot on speed too. You can get away with
> alot for 10-Base-T. With todays stuff being all 100-Base-TX
> or 1000-Base-T, the specs are *alot* tighter.

FWIW, I've pushed 10baseT through 50ft of silver satin
without errors. I'm not surprised Rich could make 100ft.
To minimize crosstalk, I used straddled pairs USOC-style.

At 100, the same cable gave nice link-lights, but was
full of errors.

-- Robert



Posted by Panda on March 12, 2006, 10:28 am
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Sam,

Normal telephone cables are Cat-3 and you need cat-5 or cat-5e cables
with proper pin assignment when crimping RJ-45 connectors to both ends.

I would rather buy ready made standard Cat-5e cable than buying
crimping tool, RJ-45 connectors and a roll of cable and start a
multi-session operation!

Naim
www.networkingland.com
.


Posted by Rich Grise on March 13, 2006, 12:19 pm
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On Sat, 11 Mar 2006 22:31:21 +0000, Doug McIntyre wrote:

>>I've used cat 3 (ordinary flat telephone extension cable) for a 100' run,
>>with cat 5 (RJ-45) connectors at each end - but I had to pay attention
>>to which pins I hooked up:
>
> Flat telephone cable (silver satin) isn't Cat-3 cable. It would be
> known as voice-grade, rated good for maybe 5kHz. Cat-3 cable is round,
> looks just like cat-5 normally, just not as many twists per inch.
>
> It also depends alot on speed too. You can get away with alot for 10-Base-T.
> With todays stuff being all 100-Base-TX or 1000-Base-T, the specs are
> *alot* tighter.

Forgive me - I kind of lied. I dug out what's left of the 100-footer,
and it might actually be cat 3 - it's not the flat "silver satin"
stuff, it's round, and beige, with solid wire with about 1 or 2
twists per foot. The connectors, I scrounged from a previous installation
that they were trashing. They were crimped, on 8-conductor solid
(real cat 5) wire; I cut it off about 4" from the end, then cut
the 4 unused wires all the way back to the connector body, and
just twisted them together and wrapped black tape around them.

Worked fine, until somebody ran over it with the fork lift. )-;
And my laptop died, so there's not much point in wiring the trailer
any more. )-; )-;

Thanks!
Rich


Posted by Don Bowey on March 11, 2006, 9:23 pm
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On 3/11/06 2:41 AM, in article
oPxQf.28581$2O6.10321@newssvr12.news.prodigy.com, "Sam Nickaby"

> I made my own Ethernet cable to extend our DSL connections to
> 25 feet. I used a cat5 male connector on each end. I use two ordinary
> phone line cords. After I lined them up identically like what cat5 cables
> are supposed to I then solder and assemble the cords. I then check the
> resistance on all eight terminals. They all check fine.
>
> The problem is when I plug one end of the cable to DSL modem the other
> to the PC the cable fails to work. I keep getting "network cable unplug" and
> "network cable plug" consistently until I unplug the cable. Does this
> mean that the cat5 won't accept the ordinary phone cables?
>
> Thanks
>
>
>
>
>
>

No, it means you have something wrong.

By the way, how many twists per foot did you put in your home-made "Cat 5"
cable?



Posted by Sam Nickaby on March 11, 2006, 11:19 pm
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> No, it means you have something wrong.
>
> By the way, how many twists per foot did you put in your home-made "Cat 5"
> cable?

There are no twists.

The DSL modem-to-computer cables I have don't seem to have the
cross-over cable, they are straight-through. I'd took a continuity test
on each terminal and don't seem to find any crossover cable. But the
link light comes up fine on the DSL modem but the link fails to
work. The modular plug I use is made by AT&T model (700A8)
part no. LR85625. The plug is normally designed for a cat5 cable
with no soldering or crimping tools required but its large delta shape
plug makes it possible to solder the telephone wire to the
terminals. I'd also check for short circuits and found none. The
phone wire isn't twisted, that may be problem. I'll have to run down
to the electronics store and get a fresh set of modular plugs and cat5
cables.

The Internet connection works fine once I move the modem closer
the PC using the 5-ft cat5 cable that came with the modem. Since
we have two PC that don't use the Internet the same time, it
makes sense to run a long cable to the other PC and just plug the
cable to the modem. This also a good way to yank the cord once
your kids stays up too late online.

Thanks all



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