Cable test sort of?
Cable test sort of?
I have a Cat3 cable in my home (not currently in use) and I wanted to find out the speed it can handle. I connected a laptop at one end and a switch at the other, and the switch displayed a gigabit link speed. This made me curious about the type of "cabe test" performed between the laptop and switch to see if the cable supports gigabit speeds. Could I apply this method to test other cables I install? I’m not certified by Fluke, but I’m just exploring how reliable that test is and what it can do.
If the switch negotiated it to 1gbit, you are probably going to receive 1gbit as well. I don’t remember the precise method chips use to determine this... it’s been many years since I encountered anything that didn’t operate at 1gbit, and even longer since I took certification tests where such specifics were required. It generally relies on measuring resistances and voltages.
The uncertainty is whether you’ll encounter significant errors—some devices can run at 1gbit with about 1% inaccuracy, which might not stop operation but could affect certain applications. Consumer switches often monitor packet counts along with checksum errors. This information might be stored on a PC, though I’m unsure where it’s located.
You could try forcing it to 100mbps, but even a standard Cat3 cable would struggle to achieve that. Some equipment can handle cables that deviate greatly from specifications. A lot of fake cables are sold, especially the flat ones, and they usually work for most users. If the cable were closer to the 100-meter Ethernet limit, it might not function properly.
I’d just try it out and check if any problems arise.
The jacket bears General Cable Verified Cat3 labeling. There are four pairs available, with a total length of approximately 60 feet.
You have nothing to lose by trying to use it. Worst that can happen is you get random failures. It will not harm the equipment.
As recommended, it may be used as long as it functions properly without unexpected failures or errors.
I was searching through some old networking materials in a box I had, and I found an old Byte Brothers Real World Certifier I bought on Amazon about ten years ago. I completely forgot it existed, so I decided to test it on the Cat3 to find out what it would show up as. The results said the cable should work within the Cat5e range and deliver gigabit speeds. I know this isn’t an official certifier, but from what I remember, it performs basic tests and stress checks, comparing the cable’s performance against a database stored on the device. It basically acts like a quality checker. If I can get 100Mbps, I’ll be satisfied.
When a network cable is certified for a category, it indicates it can operate at a certain speed over distances up to 100 meters, usually requiring a specific number of twists per inch to minimize interference. Within reasonable distances, a Cat5 cable rated for 100Mbps can still support speeds up to 1000Mbps.
Cat3 was initially designed for telephone lines, but with the right length and quality, it can also be used for networking. It often has four pairs and short distances make it work well.