I am getting a lot of collisions reported from my switch on a specific port. The port in question is where our security camera DVR connects to our LAN. The port is set to auto-negotiate the speed. Is there anything I can do to reduce these collisions?
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A switch has internal intelligence (CAM tables, buffering, etc.) that prevent collisions.
Hubs are simpler - anything received on one port is duplicated out of the others, and "early" collisions are expected as sometimes two nodes will start talking at once and step on each other - they will normally resolve automatically.
Review the documentation according to the make/model of your switch and make sure it's not really a hub.
Some hardware may be hybrid style - if your device has a 10Mpbs BNC connector for old-style thinnet that the cameras connect to, and RJ-45 for modern twisted pair, then you might have such a device. Updating your question with the model of your device might help.
If your device is a hub, replace with a switch.
If you are sure your device is a switch, then either the switch or your camera is faulty. Troubleshoot in this way:
Connect another device to the same port on the switch, such as a laptop.
Cause some data to transmit. For example, get a YouTube video running on the laptop. See if the collisions continue to be reported.
If they do, the port or switch is at fault. Try another port.
If they do not, the DVR is at fault.
Can't rule out the cable connecting the two, it could be at fault too.
LawrenceC
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