4-paired Cat. 5e at 100 Mbit/s?

[Spakes]

Okay, maybe i'm an idiot, but hear me out, please, okay?

I have a problem: devices use 100 Mbit/sec.

Details: all cables I tried are straight 4-pair UTP Cat. 5e RJ-45 cables, so all 8 contacts are in place. One cable that is 2-pair Cat. 5e still gives 100 Mbit/s...

Devices I tried: Acer Aspire V3-772G, PC with Asus P8H67 and Xiaomi Mi Router 3G (one with USB 3.0) with Padavan-ng (Linaro) 3.4.3.9-100 (tl;dr: all devices support 1 Gbps)...

Things that I tried in software: forcing Gigabit connection, both in router and PC, didn't work. Switching LAN ports, to no avail.

Any ideas? What did I miss in this bullshitty situation? Again, Cat. 5e with all 4 pairs that are intact, Gigabit devices on both ends.

Can it be that 8P8C jacks are an issue?

P. S. So, it seems like that fully-straight connections (aka 1-1, 2-2, 3-3, 4-4, 5-5, 6-6, 7-7, 8-8) is not gonna cut it for gigabit... Weird... How exactly should be contacts connected?

[Donut417]

1 hour ago, Spakes said:

Okay, maybe i'm an idiot, but hear me out, please, okay?

I have a problem: devices use 100 Mbit/sec.

Details: all cables I tried are straight 4-pair UTP Cat. 5e RJ-45 cables, so all 8 contacts are in place. One cable that is 2-pair Cat. 5e still gives 100 Mbit/s...

Devices I tried: Acer Aspire V3-772G, PC with Asus P8H67 and Xiaomi Mi Router 3G (one with USB 3.0) with Padavan-ng (Linaro) 3.4.3.9-100 (tl;dr: all devices support 1 Gbps)...

Things that I tried in software: forcing Gigabit connection, both in router and PC, didn't work. Switching LAN ports, to no avail.

Any ideas? What did I miss in this bullshitty situation? Again, Cat. 5e with all 4 pairs that are intact, Gigabit devices on both ends.

Can it be that 8P8C jacks are an issue?

P. S. So, it seems like that fully-straight connections (aka 1-1, 2-2, 3-3, 4-4, 5-5, 6-6, 7-7, 8-8) is not gonna cut it for gigabit... Weird... How exactly should be contacts connected?

4 wires for 100Mbps. 

 

8 wires for 1Gbps. 

 

So if all 8 wires are not in place, your screwed. Your not going to get 1 Gbps. 

[Spakes]

1 minute ago, Donut417 said:

4 wires for 100Mbps. 

 

8 wires for 1Gbps. 

 

So if all 8 wires are not in place, your screwed. Your not going to get 1 Gbps. 

They are in place. Straight-through 8-wire cable.

[Donut417]

Just now, Spakes said:

They are in place. Straight-through 8-wire cable.

One might be damaged. I’d try to re wire the connectors. 

 

Have you tried another other cable to verify it’s not the cable and maybe a device. 

[Spakes]

4 minutes ago, Donut417 said:

One might be damaged. I’d try to re wire the connectors. 

 

Have you tried another other cable to verify it’s not the cable and maybe a device. 

As a matter of fact, I did, AND ALL 8 WIRES IN ALL CABLES (except one with 2 pairs) ARE INTACT (tested with special RJ-45 tester)... I said so in my first post...

[Donut417]

2 hours ago, Spakes said:

As a matter of fact, I did, AND ALL 8 WIRES IN ALL CABLES (except one with 2 pairs) ARE INTACT (tested with special RJ-45 tester)... I said so in my first post...

With networking it’s either: 

• the cable
• or the devices
• misconfiguration

if all the cables tested ok. Then you start looking at the devices. Verify the devices support Gigabit and they are actually connected at Gigabit speeds. Some times you have driver issues or if for some reason the network card got configured for 100 Mbps. As you can force speed settings. 

 

Some network equipment have lights that show what speed the port is working at. For example my router shows Green for Gigabit and an orange for 100Mbps, as my HDHome run only has a 100 Mbps port. 

[Slayerking92]

 

You can use either T568A or T568B.  but both ends need to be the same.  If you do not follow a standard, the twists in the wire will not work and will result in a bad signal.

[Spakes]

7 hours ago, Donut417 said:

With networking it’s either: 

• the cable
• or the devices
• misconfiguration

if all the cables tested ok. Then you start looking at the devices. Verify the devices support Gigabit and they are actually connected at Gigabit speeds. Some times you have driver issues or if for some reason the network card got configured for 100 Mbps. As you can force speed settings. 

 

Some network equipment have lights that show what speed the port is working at. For example my router shows Green for Gigabit and an orange for 100Mbps, as my HDHome run only has a 100 Mbps port. 

I get what you mean, but both devices support gigabit (and have both orange and green indicators). And it's not a driver issue for sure. Same cable was tested with different PC and Router combo (both Gigabit, too), and with my cable there was no Gigabit, which could be fine if there wasn't a cable that connected to same router and PC will allow for gigabit speeds... So it's definitely a cable.

 

7 hours ago, Slayerking92 said:

 

You can use either T568A or T568B.  but both ends need to be the same.  If you do not follow a standard, the twists in the wire will not work and will result in a bad signal.

Wait, are you saying that color order IS IMPORTANT? I thought that only having the same order of wire colors on both ends is important for straight-through cable...

[Spakes]

NVM... Color still doesn't matter...

What matters, though, is having pairs with same colors connected to specific pairs of contacts (aka 1-2, 3-6, 4-5, and 7-8). I did 1-2, 3-4, 5-6, 7-8... Don't know why doesn't anyone write about this bullshit of a mismatch, but it seems like it has something to do with interference between pairs of wires and such... Oh, and having same color order on the other end for straight-through cable... For cross-over cable there's another way on second end (1st wire swaps places with 3rd, 2nd - with 6th, 4th - with 7th, and 5th - with 8th)...

[Donut417]

8 hours ago, Spakes said:

NVM... Color still doesn't matter...

What matters, though, is having pairs with same colors connected to specific pairs of contacts (aka 1-2, 3-6, 4-5, and 7-8). I did 1-2, 3-4, 5-6, 7-8... Don't know why doesn't anyone write about this bullshit of a mismatch, but it seems like it has something to do with interference between pairs of wires and such... Oh, and having same color order on the other end for straight-through cable... For cross-over cable there's another way on second end (1st wire swaps places with 3rd, 2nd - with 6th, 4th - with 7th, and 5th - with 8th)...

This is why the EIT/TIA A and B standards exist. To make sure that the each end matches. While the order doesnt technically matter, making sure your following one of the standards ensures the cable works as intended. 

 

Also cross over cables are pretty much dead at this point. Most network equipment has auto cross over detection now days. 

[Spakes]

14 hours ago, Donut417 said:

This is why the EIT/TIA A and B standards exist. To make sure that the each end matches. While the order doesnt technically matter, making sure your following one of the standards ensures the cable works as intended.

I actually did WO, O, WBl, G, WG, Bl, WBr, Br in this order on both ends. It still works.