Running 100 Mbps LAN with 4 wires...

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Dew itt right

2[H]4U
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Oct 28, 2005
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So my dad built a new garage (not connected to the house). He mentioned wanting to put a PC in there so I told him when he buries his utilities to run an Ethernet cable from the house.

Fast forward to today - the garage is built and the PC is in the garage. He couldn't connect to the internet so I checked the Ethernet cable with a LAN tester and 2 of the 8 wires were cut somewhere along the way. I rearranged one of the wires so that pairs 2 and 3 and intact hoping to get a 10/100 connection but it's still not working. 2 of the 4 unused wires are still connected. Do they need to be cut as well to force it down to 10/100? I can get the model numbers for the router and NIC if needed. Any ideas?
 
you need to ensure pins 1,2,3 and 6 are mapped correctly in order for it to work i.e. the orange and green pairs.

edit: this might help a bit more:

cableutpclipimage002.gif
 
Yeah, I've wired both ends via T-568B and my LAN tester confirms that 1,2,3,6,7,8 are connected and mapped correctly. Do I need to cut lines 7 and 8 for any reason?
 
for 10/100 the only wires that are used are 1,2,3 and 6. this is why you can actually run two connections down one cable simultaneously. it's a bit nasty, but it's doable. you only need all four pairs if you want to run a gigabit connection.
 
Yes, I understand that and that's exactly what I'm trying to do. The cable has those for wires intact (plus two unused wires) and it's connected to the router and PC yet I can't get a good connection between the two ("Limited or no connectivity"). I'm tryng to find out if some setting needs to be changed or if there's something I'm not doing to get this PC connected at 10/100.
 
limited or no connectivity suggests you have a basic connection i.e. a link established between the devices, just that you're either not getting an address on lease from your dhcp server or that you have a static ip address on the device that is not in the right subnet. check the latter first, and then i would either be trying another device on the end of the wire or trying the device closer to the router. if another device works ok then you know for sure its something to do with the nic so you can start to troubleshoot that by re-installing device drivers, checking it's not set to some wonky speed and/or duplex configuration, swapping it out for an alternative piece of hardware, etc. if another device doesn't work, and your existing device does work closer to the router then you know - despite what your cable tester tells you - that your wire is simply 'bad'. if that's the case i would simply try either re-terminating the cable if it is on jacks, or re-crimping it if you are directly on plugs. sorry if that seems a bit simplistic, but this is pretty much 101 standard stuff to check.
 
It may be a little late for this, but I recommend running data cables(underground) in conduit. If by chance the cable is in conduit, and you have repeatedly terminated the ends with no success, then tie to old cable and pull a new one.

If this is not feasible ( like no conduit ) use the other 2 pair, just make sure it is he same on both ends.

If this cannot be made to work, get out the shovel.

Fish :eek:
 
atomiser said:
limited or no connectivity suggests you have a basic connection i.e. a link established between the devices, just that you're either not getting an address on lease from your dhcp server or that you have a static ip address on the device that is not in the right subnet. check the latter first, and then i would either be trying another device on the end of the wire or trying the device closer to the router. if another device works ok then you know for sure its something to do with the nic so you can start to troubleshoot that by re-installing device drivers, checking it's not set to some wonky speed and/or duplex configuration, swapping it out for an alternative piece of hardware, etc. if another device doesn't work, and your existing device does work closer to the router then you know - despite what your cable tester tells you - that your wire is simply 'bad'. if that's the case i would simply try either re-terminating the cable if it is on jacks, or re-crimping it if you are directly on plugs. sorry if that seems a bit simplistic, but this is pretty much 101 standard stuff to check.
Click to expand...

Not too simplistic at all. I'll take this post with me next time I swing over to his house. Thanks...
 
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