CAT6 running at 100mbps

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MEfiX95

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Jun 6, 2015
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Hey guys, recently got CAT6 cabling free from a friend who gave me tips and a crimper.
My brother followed a few YouTube videos on how to prepare the aforementioned and from 22 m of total cabling, he made a 4m crossover cable and from the rest he prepared 3 straight cables (2x 5m and 1x 8m).

The problem i'm having is that with the crossover i'm only reaching 100mbps and on the 'network and sharing' tab of windows it shows speed for the connection locked at 100.0 mbps.

I have a cat5e crossover that once connected has transfer speeds of 1gbps and on the same tab shows the connection speed at that same speed.

I'm thinking that the problem might be my brothers PC as it's very old ('07) and my laptop is circa '14. When connecting the straight cable to my router the connection speeds read 1gbps and when connecting the straight cable to my brothers pc (as well as 2 other older laptops) it only reads a lowly 100mbps.

Was wondering if anyone had any ides on what could be the problem here? thanks in advance

My specs: Lenovo Y510P
Intel 17-4700mq
16gb ddr RAM
Nvidia 750m GT SLI (4GB)
1TB 7200rpm HGST Travelstar

Brothers specs:
Core 2 duo e8400
6gb ddr2 800 RAM
ATI 3870 1GB
Gigabyte GA-P35-DS3P
750GB HDD SATA
 
Solution
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Unless you are using antique equipment you do not need crossover cables. There is not such thing as crossover cables for gig since it transmits and receives on all 4 pair at the same time. Many times if you use crossover cables it will confuse the negotiation on gig ports and it will drop to 100m.

Now as stated above it is highly likely you did not terminate the cables properly. This is a skill that takes a while to learn and even pros still mess one up now and then. This is why they use expensive testing gear to be sure. Many times you can have the pins correct but the contact is just no good enough to pass data at high speed. There is no cheap way to test this. If you buy commercial cables most times they have tested...
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MEfiX95

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Jun 6, 2015
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That's what i thought as well, but we've reached 1gbps speed via cat5e cabling before and on the official specs for the motherboard states it sports a gigabit ethernet port. So i'm still ponderous :/
 
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jsmithepa

jsmithepa

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Jun 14, 2014
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I repeat every time I see a thread like this. Making your own cable (properly) looks easy but it's not. Pre-made CAT cables are cheap enough that it's not worth it to go through the trouble DIY'ing. If you are buying a bunch, monoprice.com has them literally for a couple of bux each. Why bother.
 
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bill001g

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Aug 9, 2012
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Unless you are using antique equipment you do not need crossover cables. There is not such thing as crossover cables for gig since it transmits and receives on all 4 pair at the same time. Many times if you use crossover cables it will confuse the negotiation on gig ports and it will drop to 100m.

Now as stated above it is highly likely you did not terminate the cables properly. This is a skill that takes a while to learn and even pros still mess one up now and then. This is why they use expensive testing gear to be sure. Many times you can have the pins correct but the contact is just no good enough to pass data at high speed. There is no cheap way to test this. If you buy commercial cables most times they have tested every cable.
 
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Solution
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MEfiX95

Honorable
Jun 6, 2015
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After testing the straight cable I realised the cross-over was the problem... Lesson learned and now I know what not to do, thanks for the answer's jsmith and digitaldoc as well.
 
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