The Glade 4.0

So I am trying to brush up on some old ****, and maybe learn some new stuff...

One area where I never bothered to learn was making cable. I get the basic gist of it.

eis/tia 568a
Pin Color
1 white/green
2 green
3 white/orange
4 blue
5 white/blue
6 orange
7 white/brown
8 brown

eis/tia 568b
Pin Color
1 white/orange
2 orange
3 white/green
4 blue
5 white/blue
6 green
7 white/brown
8 brown

I also know that to make a T1 Loopback adapter you:
pin 1 loop to pin 4
pin 2 loop to pin 5

Now here is what I am trying to figure out... crossover cabling. This has made me want to pound a 10 penny nail into my monitor and release the magic smoke...

if you look at THIS link it says:
w/o to w/g
o to g
wg to wo
bl to bl
wbl to wbl
g to o
wbr to wbr
br to br

But if you look at THIS link... it says:
wo to wg
o to g
wg to wo
bl to wbr
g to o
wbr to bl
br to wbl

And someone tried to give me a pop quiz on how to just label a crossover cable pin to pin (as I did with the loopback adapter) but I have no frikking clue.

and how the hell do I figure out PoE??

Is remembering how to wire a crossover cable even needed anymore? I thought newer hardware rendered that almost obsolete.

_________________
Darksiege
Traveller, Calé, Whisperer
Lead me not into temptation; for I know a shortcut

Different standards -

http://en.wikipedia.org/wiki/TIA/EIA-568
http://en.wikipedia.org/wiki/Ethernet_crossover_cable



http://www.ablecables.com.au/568avb.htm#_Toc426467840


Bottom line, it doesn't make a lot of difference in actual practice if you're only using pins 1,2,3 and 6. GigE uses all the pairs, but I don't know where I'd ever use a GigE in a crossover configuration... everything I've done in the last 10 years connect switches via fiber, not copper, and home stuff auto-connects.


I use this:
http://bnoack.com/index.html?http&&&bno ... /CAT5.html

straight


crossover

_________________
In time, this too shall pass.

I have a little two-node cluster at work for basic fault-tolerance. The have three 1Gb NICs -- one for the LAN, one for the SAN, and one is a crossover between the nodes. They do DRBD, cluster traffic/heartbeats, and Xen migrations over the crossover cable. You won't see that in big iron environments because at that level, no one does two-node clusters (arguably not a "real" cluster, since there's no quorum). It's a fairly common setup for simple small-to-medium business clusters like this, though.

Edit: Hah, wow -- I just noticed that quote. I didn't realize that *all* standards-compliant Gb Ethernet devices were guaranteed to auto-cross. Welp, The More You Know(TM)...

_________________
Sail forth! steer for the deep waters only!
Reckless, O soul, exploring, I with thee, and thou with me;
For we are bound where mariner has not yet dared to go,
And we will risk the ship, ourselves and all.

The thing to remember when doing crossovers is that you swap green and orange, as well as blue and brown.

_________________
"Aaaah! Emotions are weird!" - Amdee
"... Mirrorshades prevent the forces of normalcy from realizing that one is crazed and possibly dangerous. They are the symbol of the sun-staring visionary, the biker, the rocker, the policeman, and similar outlaws." - Bruce Sterling, preface to Mirrorshades

thank you guys

_________________
Darksiege
Traveller, Calé, Whisperer
Lead me not into temptation; for I know a shortcut