why both 568A & 658B?

[technovore]

I was just wondering why the industry would ever develop two standards?
why did they develop both standard EIA/TIA 568A AND EIA/TIA 568B?

if you have no clue what I'm talking about that than this doesn't concern you...

 

edit: can't change title, should be: why both 568A & 568B?

 

Many tnx,

technovore
 

[Ivyk]

Revisions?

[JAKEBAB]

does it not have something to do with crossover cables? i mean the reason why they both exist.

 

Edit: found this if it means anything to you

7.1 Comparing 568A and 568B

By looking at the first two specifications we see that the only difference is that 

the green and orange pairs are terminated to different pins, there is no 

difference as to what signal is used on what pin, only what colour wire is 

terminated onto it. So technically the standards are the same, they operate in 

the same manner and neither one is technically superior to another when used 

in Ethernet applications. 

 

It is when an Ethernet system and a phone system are combined that the 

difference really becomes apparent. 

 

7.2 Comparing 568B to USOC

Comparing 568B to USOC we see that the blue pair on both are terminated on 

pins four/five, so an existing single line USOC phone can operate on 568B 

circuitry. Although when an existing USOC phone requires two pairs we see 

that the green pair has replaced the orange pair in a 658B system, in this way 

568B isn’t completely backward compatible with standard USOC hardware.

 

7.3 Comparing 568A to USOC

Once again using the telephone standard USOC as a reference we can see 

that with the 568A standard both the blue pair and the orange pair appear in 

the same order, so both existing one and two line phones can be used with a 

568A system.

 

Source: http://bracke.web.cern.ch/bracke/HTML/568A%20v%20568B.pdf

[Zeke]

The only thing I could find was: Both are appropriate for high speed data, though 568B is somewhat more common for installed wiring and 568A is more common in jumpers

 

I had no idea they were called EIA/TIA 568A/B, I knew them as Type A and Type B connectors...

[technovore]

Revisions?

they aren't better, only different.

 

does it not have something to do with crossover cables? i mean the reason why they both exist.

no...any layout can have a crossover, even if you use neither the A nor B type.

 

The only thing I could find was: Both are appropriate for high speed data, though 568B is somewhat more common for installed wiring and 568A is more common in jumpers

 

I had no idea they were called EIA/TIA 568A/B, I knew them as Type A and Type B connectors...

B is more common yes.

They're not connectors, they're an order of colours...they both use the same RJ45-connector.

[Zeke]

B is more common yes.

They're not connectors, they're an order of colours...they both use the same RJ45-connector.

I've meant "pair layouts", it's kinda different in Russian

 

[iamfunatparties]the connector is actually called 8P8C[/iamfunatparties]

[technovore]

I've meant "pair layouts", it's kinda different in Russian

 

[iamfunatparties]the connector is actually called 8P8C[/iamfunatparties]

it's also different in dutch

I didn't know about 8p8c, but it seems they're known under both names...?

[Zeke]

it's also different in dutch

I didn't know about 8p8c, but it seems they're known under both names...?

Yeah, it's like AK-47 and AK, it's incorrect to call it "AK-47" but everybody does that anyway  

[Cryptonite]

I would say to in a major facility to know which cables are used for which network I.E Data and voice. I could be wrong though, I don't really care. Just the colour differs so that is the only logical reason anyone would want to use both, otherwise it won't matter.

[technovore]

Yeah, it's like AK-47 and AK, it's incorrect to call it "AK-47" but everybody does that anyway

how??? why???

[Zeke]

how??? why???

"AK-47" is not an official name. Well, at least not for the original model, it's just called "AK". Or "AK 7.62mm".