Ethernet cables may look similar to a phone line, but they serve a different purpose. Many high-speed Internet connections require you to use an Ethernet cable to make the connection between your computer and the high-speed modem. These cables can also be used to connect other computers to create a network. Regardless of what you need to use the Ethernet cable for, it's important to be able to identify which of the cables you have is the Ethernet cable.
Step 1
Check the size of the end of the cable. The endings on an Ethernet cable are similar to those on the end of a phone line, but they're wider and rectangular in shape. If you can't tell, compare the end to another cable and see which is wider. An Ethernet cable has a clip for securing the connection, just like a phone line.
Step 2
Look at the cable itself. When compared to the average phone line, an Ethernet cable is round and thicker. However, Ethernet cables are smaller than other types of cables used with computers.
Step 3
Check for a number stamped onto the cable itself, such as "CAT-5." Each Ethernet cable is rated based on its capability. The cable should have a number between 5 and 7. A lower number means a slower speed. Sometimes, there can be a letter with the number. A letter indicates that the cable is capable of higher speeds over longer distances.
Step 4
Look through the plastic clip at the end of the cable and count the wires. Ethernet cables have eight wires, while standard phone cables have four.
Step 5
Identify the colors of the wires within the cable ends to determine if the Ethernet cable is standard or crossover. The wires in a standard cable are in the same color order. The wires in the crossover cable are in the opposite order. Crossover Ethernet cables are used for connecting a computer directly to hardware. A standard Ethernet cable should be used if you're using an Ethernet hub between the hardware and computer.
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- Digital Inspiration: A Visual Guide to Computer Cables and Connectors; Amit Agarwal; October 2009
- Harvard University: How Do I Tell the Difference Between Phone Cable and Ethernet Cable?
- National Instruments: What are the Differences Between a Standard Category 5 Ethernet Cable and a Crossover Cable?
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