Two network sockets, one cable



  • Hi Everyone,

    We have done a small install were we are letting 2 Cat5e sockets use a single cable (As 100Mbps only uses 2 pairs, leaving 2 spare).

    In general, this works, however Dell PCs seem to have an issue where sometimes the link will drop, or it won't detect a link up for a few minutes.

    Are we supposed to ground some of the unused pins?

    Thanks


  • Rebel Alliance Developer Netgate

    That is a bad, bad idea. Drop a cheap switch there and use a single fully wired cable to uplink from that switch.

    You might have been able to split a drop like that for 10-base networks but with 100 and 1000, forget it.



  • Hi jimp,

    I really do respect your comment, as you are very experienced in this area.

    Can you please explain why this is a bad idea? I had a post on another forum, and my concern was crosstalk, however a few of the guys there said that shouldn't be an issue as you can get 24-pair network cable which is used for lots of sockets.

    Thanks


  • Rebel Alliance Developer Netgate

    Some info on here: http://en.wikipedia.org/wiki/Ethernet_over_twisted_pair

    But also:

    1. You are having problems, so obviously it is not ideal for your situation (Could be cable quality, amount of the ends that got untwisted, crosstalk, etc, etc. Lots to go wrong, very little to go right)
    2. Switches/Hubs are cheap and would be less problematic
    3. If you want to expand in the future, you're stuck
    4. If you want gigabit in the future, you need all four pairs
    5. You seem to have forgotten the first rule of cable pulling (at least around here): Why pull one when you can pull two? :) Though that may be the fault of whoever originally ran the cable.

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