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Joined: Dec 2002
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I'm guilty of being an IT guy, Ed can ghostwrite under my name, haha
Jeff Moss Moss Communications Computer Repair-Networking-Cabling MBSWWYPBX, JGAE
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Visit Atcom to get started with your new business VoIP phone system ASAP
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Proudly serving Canada from coast to coast.
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Joined: Nov 2011
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For what its worth I use 568A.
And, for those who don't know.
"A is a crossover and B is a straight-through"
But all my switches are Auto-MDIX so its better to have crossovers for when I need them and let the switches make them work as a straight-though.
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Joined: Jul 2006
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Crossover? Straight-through? Those terms only come when you wire one end "A" and the other "B" last time I checked. Electrons don't care what color wire they travel on, as long as they are in pairs. The only difference to the guys with sight is when you cut the cable and try to terminate it on a block.
I happen to use "B" because the patch panels I buy are natively "B". That's where you terninate blue, orange, green and brown. You want "A"? Just terminate blue, green, orange and brown. Yeah, I'll get right on that. Since I'm a Leviton house, I've terminated for years as Blue, Green, orange to the right and brown to the left, keeping the white-color to the right for the first 3 and color-white on the left for the first 3. I can do that in my sleep (or is that hung over?)
The only problem is when you terminate voice jacks in 8-pin "B" and cut the cable down on 66 or 110 (or bix, eh?). Now the 2-pair voice line is blue-green instead of blue-orange. That usually only happens when someone else does the infrastructure, or the architect specifies 8-pin jacks in the scope, since if I'm doing the terminating, I'll use 6-pin voice grade jacks and terminate only the first two pairs, or two pairs per jack.
Carl
This model is end of life
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Joined: Feb 2005
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The only problem is when you terminate voice jacks in 8-pin "B" and cut the cable down on 66 or 110 (or bix, eh?). Now the 2-pair voice line is blue-green instead of blue-orange.
For those of us who are old AT&T guys we're used to that, especially when installing a Partner that uses two pair. You'll frequenty see it in old business that started out with a Merlin or Definity. Like Ed said, that's where 568B was born. You'll save yourself a lot of trouble by pulling a jack off the wall and looking at it before jumpering all other ends. Better yet, replace the jacks.
-Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
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Joined: Nov 2011
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"A is a crossover and B is a straight-through"
Is a quote from the post.
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Joined: Oct 2006
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Thanks Ed. You never cease to amaze!
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Joined: Jan 2008
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Retired Moderator
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Around my house the saying (especially from my kids who have pulled a lot of wire and terminated it) is: "A is AWFUL and B is OKAY"
www.myrandomviews "Old phone guys never die, they just get locked in some closet with an old phone system and forgotten about" Retired, taking photographs and hoping to fly one of my many kites.
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Joined: Mar 2007
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Canada uses the b standard. Not sure why but that was in all cases, 99 percent of the buildings. I remember once walking into a store, and doing a troubehoot call. One bad jack at terminal end. Repaired. Tested, no go mm looked at other end, it was wired 568a standard.
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Joined: Mar 2007
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Make a correction, Canada uses 568A standard.
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Joined: Jul 2007
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An ethernet "cross-over" cable has no designation, it is what it is. The w/o & w/g prs are swapped on one end. An A cable or a B cable can both be "straight thru" if they are the same on both ends.
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OS 7030
by Bushmills - 09/03/24 12:42 PM
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