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Gigabit Connection Only Getting 100Mbps - Page 2

post #11 of 19
Quote:
Originally Posted by cslayer211 View Post

I was able to resolve the issue by replacing my Ethernet cables with Cat6. One of my computers continued to get 100Mbps, and I found that I had plugged the cable into the second RJ-45 Ethernet port, and plugging it into the first one made it 1.0Gbps. Although I don't get full or near full network utilization, which is roughly 30% or 300Mbps. What kind of speeds do you guys normally get off a gigabit connection?

Aye, CAT5 won't carry gigabit reliably. You need at least CAT5e or CAT6 preferably.
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post #12 of 19
Thread Starter 
I've replaced every cable that my server and desktop computers are using to communicate with Cat6 except for the one that leads from my router to my office (in my wall). I'm guessing that means it's this (presumably Cat5 cable) bottlenecking my speeds. Is there any way to tell which version it is by looking at it? If it needs replacing, should I get something like a Cat6a or Cat7 because the cable will be long (50ft-100ft)?
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post #13 of 19
Quote:
Originally Posted by cslayer211 View Post

I've replaced every cable that my server and desktop computers are using to communicate with Cat6 except for the one that leads from my router to my office (in my wall). I'm guessing that means it's this (presumably Cat5 cable) bottlenecking my speeds. Is there any way to tell which version it is by looking at it? If it needs replacing, should I get something like a Cat6a or Cat7 because the cable will be long (50ft-100ft)?

If you can bring the device closer and verify that you're connecting ONLY through CAT6 cable and it goes to gigabit, you know it's a CAT5 cable that's holding you back. You can look at the twisted pairs to determine which type of cable it is.

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post #14 of 19
Quote:
Originally Posted by coachmark2 View Post

Quote:
Originally Posted by cslayer211 View Post

I've replaced every cable that my server and desktop computers are using to communicate with Cat6 except for the one that leads from my router to my office (in my wall). I'm guessing that means it's this (presumably Cat5 cable) bottlenecking my speeds. Is there any way to tell which version it is by looking at it? If it needs replacing, should I get something like a Cat6a or Cat7 because the cable will be long (50ft-100ft)?

If you can bring the device closer and verify that you're connecting ONLY through CAT6 cable and it goes to gigabit, you know it's a CAT5 cable that's holding you back. You can look at the twisted pairs to determine which type of cable it is.

 

No you can't.  The only way to tell is to read it off the cable if it's printed on there.  Because the standards don't specify anything about cable geometry, they just specify a series of tests that the cable has to pass.  The manufacturer can get the cable to pass however he likes.

 

As for cat5e not supporting gigabit - if it doesn't, then you don't have cat5e.  Your terminations or cables or some other component are faulty, because if it's cat5e (and meets the cat5e specs) then it will support gigabit.

 

One thing to watch out for OP - gigabit requires 4 pairs, 10/100 only 2 pairs.  If there is a fault with the wiring that means a conductor is damaged it may allow 100mbps but gigabit won't work.  1000mbps is also much more tolerant of tight bends & poor terminations than gigabit, which could also be the problem.  You might need to replace the cables, but you likely won't need  cat6 unless your house is so large your runs are over 100m.  If you are pulling new cables then cat6a makes most sense - as it's the latest official and thus the most futureproof.  The cable cost is small in comparison to the labour and inconvenience involved with new cables, so it's worth putting in the best you can.

post #15 of 19
@the_beast

Late to this but I'll add something. I've had Ethernet cable which was clearly labelled Cat 5e, and yet it did NOT support GigE. Along the cable housing it said "2-wire", which obviously means two pairs. This was a free Ethernet cable which came with the router from my ISP.
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post #16 of 19
Quote:
Originally Posted by parityboy View Post

@the_beast

Late to this but I'll add something. I've had Ethernet cable which was clearly labelled Cat 5e, and yet it did NOT support GigE. Along the cable housing it said "2-wire", which obviously means two pairs. This was a free Ethernet cable which came with the router from my ISP.

Funny that. I just noticed this while testing my file server this week so I got 3 10M 1Gb cables of ebay that work a treat.
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post #17 of 19

Maybe I should have been a little more precise about things...

 

The category of the cable specifies (among other things) the frequency of data transmission it will support, rather than whether it'll support 10, 100 or 1000mbps ethernet.  But it doesn't specify the number of conductors.

 

So, it's possible for you to have 2 pair cable that is cat5e, but that itself won't support gigabit, because gigabit requires 4 pairs.

 

If your cable is (properly) cat5e rated, is properly installed (minimum bending radius not exceeded, conductors not untwisted too much at either end, terminations done correctly, etc) and has 4 pairs, then it will support gigabit.  If any of these conditions aren't met, then you won't get gigabit speeds.  The same is true for cat6 & cat6a - if you balls up the install so it doesn't meet spec, they won't work either.  You just get a little more leeway with the higher spec standards.

post #18 of 19
Quote:
Originally Posted by parityboy View Post

@the_beast

Late to this but I'll add something. I've had Ethernet cable which was clearly labelled Cat 5e, and yet it did NOT support GigE. Along the cable housing it said "2-wire", which obviously means two pairs. This was a free Ethernet cable which came with the router from my ISP.

Or it came bundled with a 2wire gateway...
    
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post #19 of 19
@Oedipus

Granted. The router was 100Mbit.
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