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Home » Forums » Forum Archives » Networking and Internet Sharing » Topic # 1005

2 computer network
aaron42 Jun-25-01 05:09 PM
I am trying to network two computers together, both running Windows 98. I connected the two with a crossover cable, went through all the networking steps in http://www.duxcw.com/digest/Howto/network/net2pc/intro.htm to configure NetBEUI but when I look in network neighborhood on each computer, I can't see the other computer at all. Any ideas why it isn't working?
Aaron

1. RE: 2 computer network
lbyard Jun-25-01 05:53 PM
In response to message 0
Yes. In most cases the crossover cable is not made properly. Hold the the ends of the cable up with the clips facing away. The sequence of wires at one end should match one of the diagrams at http://duxcw.com/digest/Howto/network/cable/cable6.htm. the sequence of wire at the other end should match the other diagram. Next, do you have solid Link or LNK LEDs on the network adapters? Larry

2. RE: 2 computer network
aaron42 Jun-25-01 10:16 PM
In response to message 1
Well I'm using a BNC cable and not a standard Ethernet cable, so I can't see the wires to check. However, the cable has been used before to connect two computers and it has worked, so I'm fairly certain that it is a functioning crossover cable. As to your other point, neither of the network adapters have solid lights.
Aaron

3. RE: 2 computer network
lbyard Jun-26-01 10:35 AM
In response to message 2
LAST EDITED ON Jun-26-01 AT 10:39 AM (GMT)

A coaxial cable is not a crossover cable, but it can be used to connect two computers together in what is known as a thinwire Ethernet. Again, the cable is the most likely cause of the problem. In fact, it is more likely than a twisted-pair cable. The cable should have RG58/AU printed on it. RG58, RG58/A, RG59, etc. may work, but are the wrong kinds of cable.

When one uses coax to connect two computers together in a thinwire network, the following components must be installed: A T connector (http://www.gadgetpros.com/rg58tconnector.html) must be connected directly to the BNC connector on both Ethernet adapters. The cable must be attached to one of the two BNC connectors on the T’s on each network adapter. There must be a 50-ohm terminator (http://www.gadgetpros.com/rg58terminator.html) on the other connector on each T. If the cable is connected directly to the network adapter it will not work; it must be terminated at both ends. If that is how you have things connected, and if the network adapters are dual-media or "combo" adapters, which can be used in both twisted-pair and thinwire networks, verify that they are configured to use the BNC connector. See http://duxcw.com/faq/network/thinwire.htm for more info. Larry


4. RE: 2 computer network
aaron42 Jun-26-01 01:56 PM
In response to message 3
The cable is type RG58. However, it is connected to a T connector on both ends which is then plugged into the Ethernet adapters, and the T connectors are terminated on the other side. The Ethernet adapters have two slots for both types of cable, but I don't know if they need specific configuration to use the BNC. How would I configure them appropriately? If they are configured correctly, is the fact that the cable is RG58 and not RG58/AU enough to prevent the network from working?
Aaron

5. RE: 2 computer network
lbyard Jun-26-01 02:53 PM
In response to message 4
In my experience RG58 will work, but it can be unreliable. The problem is that the 58 core conductor is a solid wire. The connectors on solid core coax come loose too easily and it is often difficult to determine by visual inspection if a plug is not attached properly/not working. A/U has a stranded core and is quite reliable if installed properly by a trained and experienced technician with the correct tools and connectors, albeit the connectors are more difficult to install until one develops a knack for doing it through practice. Also, many connectors are just plain poorly designed and come loose, and I find that the wrong types of connectors are often installed. There are many types of RG58 connectors designed for different cable jackets, diameters, and cores. And RG58 cable itself varies by manufacturer and even by reel from the same manufacturer. Furthermore, many thinwire networks use plenum wire. In my experience, this wire and the connectors for it are terribly unreliable. If the cable is rather stiff, thinner than usual, and not black, it is probably plenum. I have installed many many “ends” on thinwire networks… And those ends are rather expensive compared to RJ45 plugs. I have also seen bad T’s and terminators.

Do you see solidly lit Link (LNK) LEDs on both adapters? The Activity LEDs should be blinking. There are four ways that combo adapters are configured for the either twisted-pair or coax: 1) some automatically detect the media, 2) some can be configured in the adapter properties in the Windows control console, 3) some are configured with software that comes on a floppy that comes with the adapter, and 4) others (mainly real old ones) are configured with a jumper. What adapters do you have? Did you read the FAQ referenced in my last post? Larry


6. RE: 2 computer network
aaron42 Jun-26-01 03:08 PM
In response to message 5
The adapters are set to automatically detect which one it should use. As for the lights, both link lights are off. The activity light on the computer with the internet connection blinks occasionally but not at all regularly, and the activity light on the other computer does not blink at all.
I think that the wire is plenum, since it is thinner and it is grey not black. You think that a faulty cable is probably my problem?
Aaron

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