Re: OT Any web site that teaches how to make LAN cable connection

[Petro]

On Wed, Mar 27, 2002 at 12:07:03PM -0800, Nathan E Norman wrote:
> If you find yourself making cables regularly, get a tester that tests

s/making cables regularly/in charge of a medium to large network/

> continuity and attenuation - they're a lifesaver.  Nothing sucks more
> than troubleshooting the tough network problem that's caused by an
> intermittent in your homemade cable.

s/ttent/ttent fault/
s/homemade//

Cables break or otherwise wear out. They do. Cable testers are
a really good thing to have. 

-- 
Share and Enjoy. 


-- 
To UNSUBSCRIBE, email to [EMAIL PROTECTED] 
with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

Re: OT Any web site that teaches how to make LAN cable connection

[Mike Dresser]

On Wed, 27 Mar 2002, Vector wrote:

> >From -IReturn-Receipt-To:
> List-Post: 
> List-Help: 
> List-Subscribe: 
> List-Unsubscribe: 
> Precedence: list
> Resent-Sender: [EMAIL PROTECTED]
>
> Even that is incorrect.  The pins that ethernet uses with RJ45 is 1/2
> and 3/6, not 3/5 or 4/6.

I was mentioning the whole colour swap thing that a lot of people seem to
miss.

mike


-- 
To UNSUBSCRIBE, email to [EMAIL PROTECTED] 
with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

Re: OT Any web site that teaches how to make LAN cable connection

[Nathan E Norman]

On Wed, Mar 27, 2002 at 01:56:27PM -0300, Henrique de Moraes Holschuh wrote:
> For 10BaseT and 100BaseTX networks, the correct wiring is:
> 
> 12356478   12356478   (straight, aka NIC<->HUB), where 12 is the first 
> pair, 34 the second pair, etc.  DO NOTICE THE SPLIT IN THE SECOND PAIR!
> 
> Crossover is: 12356478 34156278  (NIC<->NIC)
> 
> Only the first+second and third+sixth positions are used in 10BaseT and
> 100BaseTX. You wire it 12345678 12345678 and you will be inducing a lot of
> noise in both the ethernet wiring, and anything else next to it.  If you
> have been doing such a stupid thing around your home or office, redo it
> right.
> 
> And please respect the minimum and maximum lengths for the cabling, or you
> will have problems.

An addendum: since cat5 cable can't be ribbon cable, I find it
confusing to refer to the wires by numbers.  When I explain this I use
the colors instead.

So, a straight-through cable is orange-white, orange, green-white,
blue, blue-white, green, brown-white, brown.  Use this scheme at both
ends.

A crossover cable has one end as above, and the other end is
green-white, green, orange-white, blue, blue-white, orange,
brown-white, brown.

What you said, a different way :)

More useless info:

I believe the middle 4 pins are wired that way to allow cat5 cable to
be used as phone patch cords (the middle pair is line 1, the outer
pair is line 2).

Also, I've seen crossover cables that omitted the blue and brown pairs
completely (that is to say, they weren't crimped into the plug).  

If you find yourself making cables regularly, get a tester that tests
continuity and attenuation - they're a lifesaver.  Nothing sucks more
than troubleshooting the tough network problem that's caused by an
intermittent in your homemade cable.

-- 
Nathan Norman - Micromuse Ltd.  mailto:[EMAIL PROTECTED]
Gil-galad was an Elven-king.|  The Fellowship
Of him the harpers sadly sing:  |of
the last whose realm was fair and free  | the Ring
between the Mountains and the Sea.  |  J.R.R. Tolkien


pgp4su5PEjBAY.pgp
Description: PGP signature

Re: OT Any web site that teaches how to make LAN cable connection

[Vector]

Even that is incorrect.  The pins that ethernet uses with RJ45 is 1/2
and 3/6, not 3/5 or 4/6.

Straight Through:
One End:Other End:
1->1
2->2
3->3
6->6

Null Cable
One End:Other End:
1->2
2->1
3->6
6->3


And if you really want to be thorough then on the straight through
4 -> 4, 5 -> 5, 7 -> 7, 8 -> 8
and on the null cable 4 -> 5, 5 -> 4, 7 -> 8, 8 -> 7

vec

- Original Message -
From: "Mike Dresser" <[EMAIL PROTECTED]>
To: "Elizabeth Barham" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Cc: "list debaun" 
Sent: Wednesday, March 27, 2002 9:44 AM
Subject: Re: OT Any web site that teaches how to make LAN cable
connection


> > There's straight-thru and crossover - for crossover, they should
be
> > reversed. If the original is BLUE-RED-GOLD then the matching one
> > should be GOLD-RED-BLUE (example is for explanatory purposes
only).
> > Straight-thru is literally that ; the wire on both ends should
look the
> > *exact* same through the RJ-45.
> >
> > Straight-Thru:
> >
> > 1 2 3 4 5 6 7 8  1 2 3 4 5 6 7 8
> >(bottom) (bottom)
> >
> > Cross Over:
> > 1 2 3 4 5 6 7 8  8 7 6 5 4 3 2 1
> >   (bottom)  (bottom)
> >
> > Elizabeth
>
> Please don't follow either of these wiring diagrams.
>
> It's very important that pin 3/5(or 4/6, depending on how you look
at it)
> are swapped on both ends.
>
> You want: (T-568A)
>
> White/green, green, white/orange, blue, white/blue, orange,
white/brown,
> brown
>
> Sometimes you'll see (T-568B, preferrred for new installations)
>
> White/Orange, Orange, White/Green, Blue, White/Blue, Green,
White/Brown,
> Brown.
>
> Both will work the same.
>
> For crossover:
>
> Do above, one side the orange/blue/green/brown setup, and the other
side
> the green/blue/orange/brown setup.
>
> If you don't swap the 3/5(4/6) pins, your cable will might work, but
> you'll get massive crosstalk, especially over distance or in an
> electrically noisy environment.
>
> Please see:
>
> http://www.escape.ca/~droopy/ethernetcables.html
> http://www.incentre.net/incentre/frame/ethernet.html
>
> Also, see:
>
>
http://catalog.belkin.com/IWCatSectionView.processs?IWAction=Load&Merc
hant_ID=&Section_Id=522
> http://www.startech.com/cable/networking.htm
>
> Because that's a LOT easier and more reliable way to do it!  If you
> are making your own cables, proper cable testers cost far too much
money.
> I make do with an old Fluke 620, but it isn't rated for 100mbit or
> gigabit.
>
> Hope this helps,
> Mike Dresser
>
>
> --
> To UNSUBSCRIBE, email to [EMAIL PROTECTED]
> with a subject of "unsubscribe". Trouble? Contact
[EMAIL PROTECTED]
>


-- 
To UNSUBSCRIBE, email to [EMAIL PROTECTED] 
with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

Re: OT Any web site that teaches how to make LAN cable connection

[Henrique de Moraes Holschuh]

On Wed, 27 Mar 2002, Elizabeth Barham wrote:
> > is there Any web site that teaches how to make LAN
> > cable connection i mean like cross over & straight
> > wires ? also you can ask question lelated to cabeling
> > ?

Use www.google.com, you will find good answers for your questions quite
easily.  E.g.: I found http://www.alatec.com/info/rj45.html in less than 2s.

> There's straight-thru and crossover - for crossover, they should be
> reversed. If the original is BLUE-RED-GOLD then the matching one
> should be GOLD-RED-BLUE (example is for explanatory purposes only).
> Straight-thru is literally that ; the wire on both ends should look the
> *exact* same through the RJ-45.
> 
> Straight-Thru:
> 1 2 3 4 5 6 7 8  1 2 3 4 5 6 7 8
>(bottom) (bottom)
> 
> Cross Over:
> 1 2 3 4 5 6 7 8  8 7 6 5 4 3 2 1
>   (bottom)  (bottom)

That is quite wrong!

*Ethernet* LAN cables are polarized twisted pairs, with four pairs in one
cable. Usually only 2 pairs are used for 10 and 100 Mbit/s ethernet.  You
*MUST* keep each signal in a twisted pair (i.e. TX+ and TX-, RX+ and RX-),
which a 12345678 12345678 wiring will NOT do.

If you're not an EE and don't know anything about waveguides, at the very
least do the wirings as the standards tell you to, instead of doing it in
a way that looks pretty or something equally unwise.

Green and white-green are a pair; if you connect TX- to one, you must
connect TX+ to the other.  And you must connect TX+ to RX+ and TX- to RX-,
so don't go wiring 12 in one tip, and 21 in the other.  Hubs/switches and
NICs have the TX and RX positions reversed, so a straight cable will do the
right thing.

For 10BaseT and 100BaseTX networks, the correct wiring is:

12356478   12356478   (straight, aka NIC<->HUB), where 12 is the first 
pair, 34 the second pair, etc.  DO NOTICE THE SPLIT IN THE SECOND PAIR!

Crossover is: 12356478 34156278  (NIC<->NIC)

Only the first+second and third+sixth positions are used in 10BaseT and
100BaseTX. You wire it 12345678 12345678 and you will be inducing a lot of
noise in both the ethernet wiring, and anything else next to it.  If you
have been doing such a stupid thing around your home or office, redo it
right.

And please respect the minimum and maximum lengths for the cabling, or you
will have problems.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh


-- 
To UNSUBSCRIBE, email to [EMAIL PROTECTED] 
with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

Re: OT Any web site that teaches how to make LAN cable connection

[Mike Dresser]

> There's straight-thru and crossover - for crossover, they should be
> reversed. If the original is BLUE-RED-GOLD then the matching one
> should be GOLD-RED-BLUE (example is for explanatory purposes only).
> Straight-thru is literally that ; the wire on both ends should look the
> *exact* same through the RJ-45.
>
> Straight-Thru:
>
> 1 2 3 4 5 6 7 8  1 2 3 4 5 6 7 8
>(bottom) (bottom)
>
> Cross Over:
> 1 2 3 4 5 6 7 8  8 7 6 5 4 3 2 1
>   (bottom)  (bottom)
>
> Elizabeth

Please don't follow either of these wiring diagrams.

It's very important that pin 3/5(or 4/6, depending on how you look at it)
are swapped on both ends.

You want: (T-568A)

White/green, green, white/orange, blue, white/blue, orange, white/brown,
brown

Sometimes you'll see (T-568B, preferrred for new installations)

White/Orange, Orange, White/Green, Blue, White/Blue, Green, White/Brown,
Brown.

Both will work the same.

For crossover:

Do above, one side the orange/blue/green/brown setup, and the other side
the green/blue/orange/brown setup.

If you don't swap the 3/5(4/6) pins, your cable will might work, but
you'll get massive crosstalk, especially over distance or in an
electrically noisy environment.

Please see:

http://www.escape.ca/~droopy/ethernetcables.html
http://www.incentre.net/incentre/frame/ethernet.html

Also, see:

http://catalog.belkin.com/IWCatSectionView.processs?IWAction=Load&Merchant_ID=&Section_Id=522
http://www.startech.com/cable/networking.htm

Because that's a LOT easier and more reliable way to do it!  If you
are making your own cables, proper cable testers cost far too much money.
I make do with an old Fluke 620, but it isn't rated for 100mbit or
gigabit.

Hope this helps,
Mike Dresser


-- 
To UNSUBSCRIBE, email to [EMAIL PROTECTED] 
with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

Re: OT Any web site that teaches how to make LAN cable connection

[Bob Hilliard]

faisal gillani <[EMAIL PROTECTED]> writes:

> 
> is there Any web site that teaches how to make LAN
> cable connection i mean like cross over & straight
> wires ? also you can ask question lelated to cabeling
> ?

 apt-get install doc-linux-text, then see Section 5.2 of
/usr/share/doc/HOWTO/en-txt/Ethernet-HOWTO.gz  

Bob
-- 
   _
  |_)  _  |_   Robert D. Hilliard  <[EMAIL PROTECTED]>
  |_) (_) |_)  1294 S.W. Seagull Way   <[EMAIL PROTECTED]>
   Palm City, FL  USA  GPG Key ID: 390D6559 
   PGP Key ID: A8E40EB9



-- 
To UNSUBSCRIBE, email to [EMAIL PROTECTED] 
with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

Re: OT Any web site that teaches how to make LAN cable connection

[Elizabeth Barham]

faisal gillani <[EMAIL PROTECTED]> writes:

> is there Any web site that teaches how to make LAN
> cable connection i mean like cross over & straight
> wires ? also you can ask question lelated to cabeling
> ?
> 
> thanks
> Faisal

It's pretty easy. If you're in the United States, the best place to
purchase a crimping tool and the RJ-45 connectors are at Home Depot.

It's just a matter of having the cable, stripping it, and putting each
pair of wire in the correct spot and then crimping the wire with the
connector.

There's straight-thru and crossover - for crossover, they should be
reversed. If the original is BLUE-RED-GOLD then the matching one
should be GOLD-RED-BLUE (example is for explanatory purposes only).
Straight-thru is literally that ; the wire on both ends should look the
*exact* same through the RJ-45.

Straight-Thru:

1 2 3 4 5 6 7 8  1 2 3 4 5 6 7 8
   (bottom) (bottom)

Cross Over:
1 2 3 4 5 6 7 8  8 7 6 5 4 3 2 1
  (bottom)  (bottom)

Elizabeth


-- 
To UNSUBSCRIBE, email to [EMAIL PROTECTED] 
with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

Re: OT Any web site that teaches how to make LAN cable connection

[Oliver Elphick]

On Wed, 2002-03-27 at 09:34, faisal gillani wrote:
> is there Any web site that teaches how to make LAN
> cable connection i mean like cross over & straight
> wires ? also you can ask question lelated to cabeling
> ?


Per Google:  http://www.faqs.org/faqs/LANs/cabling-faq/
 http://www.techfest.com/networking/lan
-- 
Oliver Elphick[EMAIL PROTECTED]
Isle of Wight  http://www.lfix.co.uk/oliver
GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839  932A 614D 4C34 3E1D 0C1C

 "Cast all your anxiety on him, because he cares for  
  you." I Peter 5:7  


signature.asc
Description: This is a digitally signed message part

Re: OT Any web site that teaches how to make LAN cable connection

[Paul 'Baloo' Johnson]

On Wed, 27 Mar 2002, faisal gillani wrote:

> is there Any web site that teaches how to make LAN
> cable connection i mean like cross over & straight
> wires ? also you can ask question lelated to cabeling

Yes, I found some by way of Google.  Feel free to make a search for
yourself.

-- 
Baloo


-- 
To UNSUBSCRIBE, email to [EMAIL PROTECTED] 
with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

OT Any web site that teaches how to make LAN cable connection

[faisal gillani]

is there Any web site that teaches how to make LAN
cable connection i mean like cross over & straight
wires ? also you can ask question lelated to cabeling
?

thanks
Faisal

__
Do You Yahoo!?
Yahoo! Movies - coverage of the 74th Academy Awards®
http://movies.yahoo.com/


-- 
To UNSUBSCRIBE, email to [EMAIL PROTECTED] 
with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]