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2 posts

Wannabe Geek

Topic # 152075 15-Sep-2014 11:55
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Hi guys, straight to the point. Is Cat5 capable in running at least 30mbps?

I'm currently running: fibre modem (wifi disabled), running through 30m Cat5 cable to a wireless router, I seemed to have a drop in speed, from 27mbps to around 19mbps after installing the Ethernet cable. (checked through

Is this due to the limitations of Cat5? I have done a few readings about it and apparently Cat5 is capable of up to 100mbps. Unless cheap quality cables are just dead horrible. Any suggestions would be much appreciated.

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  Reply # 1128943 15-Sep-2014 11:59
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I don't think it's likely to be the Cat5 cable unless is it very badly kinked.  Can you bypass this cable and test directly at the router with a laptop connected via cable?

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  Reply # 1128956 15-Sep-2014 12:09
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Hi, Cat5 is rated to 100Mb/s to a full 100m, it will also do GigE to around 60m depending on the actual cable build/manufacture. It is possible to get GigE out to the full 100Mb/s but all depends on the build quality. Cat5e was devised as a standard to provide higher headroom to ensure GigE to a full 100meters, to achieve this there was an increase in twist rate to assist with crosstalk and a reduction in twist splay to reduce timing skew which is important for GigE where there are two channels in each direction, if the timing between the two channels in a direction diverge too much then the two channels cannot be re interleaved back together without errrors.

Regardless cat5 will provide full 100Mb/s 10/100 Fast Ethernet operation to the full 100m channel length.


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  Reply # 1128961 15-Sep-2014 12:13
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Have you also unplugged the wireless access point and connected the laptop to the Cat5 cable at that point?  That would rule out any wi-fi issues.

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Wannabe Geek

  Reply # 1129633 16-Sep-2014 09:10
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Thanks for the input! I tried using another device and I found that the culprit was my phone (S5), for some reason it had decreased in speed via speedtest on phone, but speeds still remain the same on laptops. Unfortunately I had to take down the 30m cabling around the house as gf's mum isn't happy with how it looks around despite me explaining i will have it cornered around the edges of the ceiling.... Might head off to Harvey Norman and get a 1300ac (hopefully powerful enough) to reach a small dead spot at the other end of the house.




Once again, thank you for the three of you for the help and knowledge. =)

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  Reply # 1130160 16-Sep-2014 18:30
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Might be worth looking at powerline adapters, I was able to use some cheap $80 a pair ones to get 50\60 Mbps at the far end of my old house. You could then use an old router as an AP at that end of the house.

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