Ethernet Cable

1. What are Ethernet Cables?
      Ethernet cables connect network devices such as modems, routers, and adapters. They transmit data using the Ethernet protocol. Ethernet cables have RJ-45 jacks on both ends, each with 8 pins. (They look similar to telephone jacks, which use 4 pins or 6 pins.)
   Note:
   
   • Equipment using an Ethernet cable is referred to as wired.
   • Wireless equipment uses radio waves in place of some (or all) Ethernet cables. A network device that uses both Ethernet and wireless connections is usually called just wireless.
2. How to find the first pin position in RJ45 connector?
   
3. Pin Position in RJ45 connector?
   
4. RJ45 Pins:
   
   
   
5. Straight-Through Ethernet Cable:
   1.A straight-thru cable has identical ends.
   2.A straight-thru is used as a patch cord in Ethernet connections.
   3.Both the T-568A and the T-568B standard Straight-Through cables are used most often as patch cords for your Ethernet connections. If you require a cable to connect two Ethernet devices directly together without a hub or when you connect two hubs together, you will need to use a Crossover cable instead
   1. T-568A:
      
   2. T-568B:
      
6.  Crossover Ethernet Cable:
   
7. Transmission in straight and cross over cable:
   

Points to Remember:

1. A straight-thru cable has identical ends.
2. A crossover cable has different ends.
3. A straight-thru is used as a patch cord in Ethernet connections.
4. A crossover is used to connect two Ethernet devices without a hub or for connecting two hubs.
5. A crossover has one end with the Orange set of wires switched with the Green set.
6. Odd numbered pins are always striped, even numbered pins are always solid colored.
7. Looking at the RJ-45 with the clip facing away from you, Brown is always on the right, and pin 1 is on the left.
8. No more than 1/2" of the Ethernet cable should be untwisted otherwise it will be susceptible to crosstalk.
9. Do not deform, do not bend, do not stretch, do not staple, do not run parallel with power cables, and do not run Ethernet cables near noise inducing components.