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10 MHz to 100 MHz Network
computerjohn Oct-16-00 07:46 PM
I have 20 systems (all with Dlink 10/100 cards)hooked up to (2) DSH-16 Dlink hubs which is hooked up to (1) server running Windows 2000 Server. All systems are also running Windows 2000. My problem is that I can't get all of the systems running at 100MHz - some do, some don't - it's very inconsistant. Any suggestions??


1. RE: 10 MHz to 100 MHz Network
lbyard Oct-16-00 09:35 PM
In response to message 0
Check you cables and see if they are made properly (http://duxcw.com/digest/Howto/network/cable/cable1.htm). It most certainly makes a difference in how they are wired, especially on longer runs... Check you cable to be sure it is be CAT 5 or 5E cable and clearly labeled. Check to see if the cable is installed correctly (see http://duxcw.com/digest/Howto/network/cable/cable9.htm). Tight bends, stretching, over cinched bundles, staples, etc. can affect cable characteristics. If you are using punch-down blocks, 66 blocks are not satisfactory for 100 Mhz. If you are using 110 blocks, they will work at 100 Mhz if punched-down properly. Check your wall jacks, if you have them. The ends of CAT 5 cable pairs should not be untwisted more than 1/2". Near-end cross talk can result if they are. RJ45 plugs and jacks should be CAT 5/5E; there are RJ45 jacks and plugs that are not CAT 5. There are RJ45 plugs for stranded wire and RJ45 plugs for solid core wire… Stranded wire jumper cables should not be longer than about 10 feet (however, I have seen much longer ones work OK). Stranded wire can degrade with age. Try swapping cables/computers around. If that fixes the problem, you know what is causing it. I have never had a 100 Mhz board run at 10 Mhz on my network and I have installed many many D-Link adapters and tested them on my network. Check the Advanced Network Adapter Properties in the Control Panel, Network to be sure the Connection Type or Link Speed or something like that is set to Auto or 100 Mhz, or something like that (varies by adapter). You could have hub port problems. Try switching ports. You could have some bad adapters. You could have a combination of problems, but most are probably cable problems… Larry

2. RE: 10 MHz to 100 MHz Network
computerjohn Oct-17-00 05:54 PM
In response to message 1
Thank you for all this terrific info. I have a strong suspicion that the cables are not correctly installed. I do however, have one more question. All of these cables were installed in the wall by someone else and I can't figure out the pin out on these plugs. With your help, I now undertand the RJ-45 plugs, but these are very different. Any suggestions or white sheets on how these work?
Thanks again for all your help!
Kathy

3. RE: 10 MHz to 100 MHz Network
lbyard Oct-17-00 07:42 PM
In response to message 2
LAST EDITED ON Oct-17-00 AT 07:43 PM (GMT)

Are the actual colors the same as http://duxcw.com/digest/Howto/network/cable/cable6.htm. There is one other set of colors that may apply... With no modesty whatsoever because it is true... my cable how to article is the best explaination of how they work on the Internet and probably the best one that exists anywhere. Larry


4. RE: 10 MHz to 100 MHz Network
computerjohn Oct-17-00 11:31 PM
In response to message 3
They are exactly the same colors. The trouble I have is that the little plugs that go on the plates are not as clear cut (as far as where each colored wire goes) as this wonderfully made diagram. It's difficult for me to translate one into the other.

5. RE: 10 MHz to 100 MHz Network
lbyard Oct-18-00 03:29 PM
In response to message 4
The two proper color codes for jacks are shown on http://duxcw.com/digest/Howto/network/cable/cable5.htm. See if that helps. Other combinations will work; electrons and electro-magnetic waves couldn’t care less about the color of the wires. The important things are the quality and installation of the wire, quality and proper installation/crimping of jacks and plugs, and that pins 1 and 2 at each end are connected by wires from the same pair and that pins 3 and 6 at both ends are also connected by the same pair. All too often pins 3 and 6 are connected by wires from different pairs and that can cause the problem you are seeing on longer runs. The rest of the pins have no function, are not used. Larry

6. RE: 10 MHz to 100 MHz Network
computerjohn Oct-18-00 04:22 PM
In response to message 5
Larry - I want to thank you for all your help - I'm going to be tackling this project again this wekend, sure is nice to know someone out there can give sound hardware advice where some of us are still learning.
Thanks!
Kathy

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