So, uh... LAN cabling.

s3rial ones3rial one Registered User
I seem to be having horrendous luck with my PCs lately. Just finished troubleshooting a freezing issue on one, and then I notice the network performance on the other is being rather flaky.

Long story short: using DSLReports' flash speed test and the same Chicago, IL test site, I get tests that reflect my 16 MB / 2MB connection with one cable, and tests where the download speed is less than half that with, well... three other cables that I've had sitting around for who knows how long, and a brand new Belkin cat5e cable I just bought.

What's causing that? The good cable is just the one that came with my Xbox 360.

(Just as an aside, I have two PCs with identical hardware sitting here, plus a laptop that's connected wirelessly. I've been testing this all afternoon: it is definitely the cable. The one is good, and all the others appear to suck horribly.)

How can I tell the difference? The wiring in the good cable is orange, orange, green, green, which... I'm not familiar with. What the hell is it? All that's printed on it is:

"Foxconn E204149 (UL) Type CM 75[degrees]C STP 26AWG 2pairs patch cable"

Looking at the plug, it goes orange, orange, green, blank, blank, green, blank, blank. And I say blank in that there is no wire there; not even a white one (that I can see).

Basically, I want more of this cable, because it apparently doesn't suck like everything else I have, but I don't know what makes it different.

On second look, the "good" cable is the only 2-pair cable. The others are all 4-pair.

s3rial one on


  • DaedalusDaedalus Registered User regular
    edited June 2009
    how many times did you run the test for each cable?

    Daedalus on
  • s3rial ones3rial one Registered User
    edited June 2009
    Daedalus wrote: »
    how many times did you run the test for each cable?

    Up through now? Probably 10-15 for each.

    What it seems to do is go really fast, and then just freeze for a second. But it only does that with downstream. I get good upload speeds with either cable.

    Linksys finally has a PCI 802.11n card that'll run at 5ghz... I'm tempted to just say fuck it, order one of those, and disable the onboard LAN.

    I cannot for the life of me understand why a cable designed for 100mbit LAN is getting drastically better performance than one designed for 1000mbit LAN.

    I have a suspicion that the flash-based test isn't accurate, though. Even with the good cable, I get substantially lower numbers on the java-based test.

    EDIT: I'm thinking it might just be the onboard LAN itself.

    Both PCs I have are essentially identical, and they both seem to like that same cable. I just plugged my laptop in for the speed test, though (instead of using the wireless), using one of the "bad" cables. Wouldn't you know it, the results were just about ideal.

    Now the question is: did I miraculously get two motherboards with the same defect? Does this model motherboard just have shitty LAN? Or is this a Windows 7 thing?

    Blah. I fucking hate computers sometimes.

    s3rial one on
  • DeicistDeicist Registered User regular
    edited June 2009
    Maybe it's a gigabit issue? are you showing a gigabit connection when connected with the 'better quality' (ie: not working) cables and 100Mbit with the XBox cable? try limiting your network card to 100MBit and see if it helps.

    Deicist on
  • useless4useless4 Registered User regular
    edited June 2009
    I agree with Tallus... check to see if you have jumbo frames turned on. I bet it's a framing issue possibly related to gigabit speeds

    useless4 on
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