[SOLVED] Help With T568A vs B ethernet Standards

[papb2020]

I finally got around to running Cat6 from my router (Netgear R6700v3) to my TV. When it came time to crimp the ends, I found that T568A did not work. I redid the end thinking it was a bad crimp and still no connection. I finally switched to the T568B configuration and it start to work. Speeds are great and all is good.

Why didn't T568A work? I thought the two could be use interchangeably on most hardware. Is my router not one of them?

 

[kanewolf]

I finally got around to running Cat6 from my router (Netgear R6700v3) to my TV. When it came time to crimp the ends, I found that T568A did not work. I redid the end thinking it was a bad crimp and still no connection. I finally switched to the T568B configuration and it start to work. Speeds are great and all is good.

Why didn't T568A work? I thought the two could be use interchangeably on most hardware. Is my router not one of them?

As long as both ends are the same, it shouldn't matter. If one end is A and one is B, then you may have a problem.

 

[papb2020]

yea, they were definitely both wire to B.

One end was keystone, but following the A pattern. The other end was crimped with the A pattern. Could that be the problem?

I've made B-->B patch cable that work and keystone B-->keystone B that also work. I haven't gotten keystone A-->crimp A to work. I haven't tried keystone B --> crimp B, though. I got sick of wasting my connectors.\

Thanks

 

[kanewolf]

yea, they were definitely both wire to B.

One end was keystone, but following the A pattern. The other end was crimped with the A pattern. Could that be the problem?

I've made B-->B patch cable that work and keystone B-->keystone B that also work. I haven't gotten keystone A-->crimp A to work. I haven't tried keystone B --> crimp B, though. I got sick of wasting my connectors.\

Thanks

As long as both ends are the same it doesn't matter. Mixing an A cable with a B in-wall run... doesn't matter. All 8 wires still go through.
If you are going to terminate cables, or have in-wall cabling, I recommend getting an inexpensive cable tester like this -- https://www.amazon.com/Klein-VDV526-052-Scout-Junior-Tester/dp/B004CI9NRM It will let you verify that you have all 8 wires terminated and no crossed wires.

 

[SamirD]

As long as both ends are the same, it shouldn't matter. If one end is A and one is B, then you may have a problem.

Actually, either way shouldn't matter with an auto-crossover port. A cable with 568A on one end and 568B on another is a crossover cable, which was needed to connect switch ports prior to auto MDIX ports.

If the device didn't support auto cross over or the switch didn't, or either or both got confused, or it was a bad crimp, it wouldn't work. Personally, I think it was just a bad crimp as it's easier to get a cable end wrong than right ime.