Certifying a crossover patch cable - DTX CableAnalyzer

According to either ANSI/TIA-568-C.2 or IEC 61935-2, the cable must have the same wiring code at each end. Technically speaking, you cannot certify a crossover cable. Crossover cables are considered adapters and adapters are not part of these cabling standards. That's why if you select a Patch Cord Test Limit in the DTX CableAnalyzer, it will not allow you to select Crossover in the Outlet Configuration. That said, we'll show you how to create a custom test to do this.

Crossover cables
Historically, to connect two switches/hubs together, you would need a crossover cable. Without a crossover cable, transmit would go to transmit and receive would go to receive and hence would not work. However, practically speaking, many switches/hubs these days automatically detect if the transmit goes to transmit and receive goes to receive. If the switch/hub detects this condition, it crosses the pairs inside the switch/hub negating the need for a crossover cable. Take a look at your switch/hub specification to see if it has Auto-MDIX. If so, you do not need a cross over cable.

Setting up your DTX CableAnalyzer

  1. Rotate the dial to SETUP.
  2. Press ENTER twice.
  3. Press F1 More.
  4. Highlight Custom and press ENTER.
  5. Press F1 Create.
  6. Choose a name for your Test Limit.
  7. Highlight Use Default Values From and press ENTER.
  8. Highlight Patch Cords and press ENTER.
  9. Highlight the test limit you wish to use and press ENTER.
  10. Press SAVE
  11. Highlight your new custom test limit and press ENTER.
  12. Highlight Outlet Configuration and press ENTER.
  13. Highlight Crossover and press ENTER.
  14. Rotate the dial to AUTOTEST to begin testing.