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Network Connectivity Issues

A client is having a strange issue with their network.

The cable guys ran a Cat 6 cable from the main office to the restaurant building which is about 100 feet away including ups and downs. They placed a Keystone jack at the end of that cable. Another cable is then plugged in which goes about 50 feet.

The Problem:

If I use a laptop on the end either cable I get a DHCP assigned address and I am able to surf the web. However, I need to use an NCOmputing terminal ( www.ncomputing.com ) which when I plug it in does not find the DHCP server. I took the terminal up to the main office which is on the same subnet and it connected to the DHCP server.

I tried a switch at the end of the main cable which was ran from the main office, but when I did that I no longer got the DHCP server.

Again there is only one subnet on the network.

When I tested the main cable with my Network tester it is showing the first pin is not connected, however if my laptop is connected to it without a switch it works perfectly.

Your assistance is greatly appreciated.
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pdxwarrior

I'm a little curious about how good signal strength is when you start connecting cables together as you've described.  It sounds like it's working though when you use the laptop.  It might be possible that the NCO device is more sensitive and having a harder time with the signal on the wire.

As for connecting a switch... you might need to use a cross-over cable.  Depending on the models and age of your switch, it might not detect the cabling properly.  Typically like devices should be connected using a cross-over.

Are you able to get to the keystone connection?  If so, plug a cross-over into that and then connect to the switch.  Check your interfaces and make sure that they are up.  If you are using a managed switch you can also set an IP address and make sure that the two switches can ping each other.  From there connect your laptop, verify you can reach the DHCP server and then tie in the 50 ft wire up to to the NCO device and see if that is able to connect.
On the NCO computer, do you see a link light or connection?  Or does it come up as disconnected?
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ASKER

Thank you for prompt responses.

The cable guy said that he has re-terminated the ends multiple times but I have already requested that they do them again.

The tester does not give distances but I can take a rough measurement.

The switch is not a managed switch but it is not old either. It was actually added to the same network about 6 months ago and works fine in another location on the compound with a direct cat6 cable back to the main office. I moved it to test that connection.

The NCO light shows connection but it shows that once the cable is plugged in.
The wire associated with pin 1 (usually white/orange) may be damaged somewhere along the run.

It is possible to substitute another pair for the orange pair, if necessary, but the substitution has to be done at both ends of the cable.

Also, make sure that pinouts are t568B compatible.
Have you tried statically mapping the NCO computer to verify if there is in fact connectivity.

A possibility is that speed auto negotiation is not working.  Because your laptop works, but the NCO computer doesn't would lead me to believe there is something different between the two.  Maybe different speed of NIC?

You say there is a connection light on the NCO computer, can you tell if the connection is at the same speed and duplex as your laptop?
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ASKER

It does not work with static IP. Not sure how to tell the speed.
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ASKER

The end was changed from a keystone jack to a normal RJ45 jack which we plugged into a wireless switch and it works.