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2. Category 5 cable - Wikipedia

   en.wikipedia.org/wiki/Category_5_cable

   Category 5 cable that is partially stripped and showing its four twisted pairs (eight wires). Category 5 cable (Cat 5) is a twisted pair cable for computer networks.Since 2001, the variant commonly in use is the Category 5e specification (Cat 5e).

3. 25-pair color code - Wikipedia

   en.wikipedia.org/wiki/25-pair_color_code

   Small cables with 5 pairs or less sometimes omit the white tracer color from the ring wires, as it is not needed. Large cables would usually omit both tracer colors requiring both wires in a twisted pair to be examined to identify the pair, [8] but as manufacturing techniques have improved this no longer offers a cost saving and so is rarely seen.

4. Cable tester - Wikipedia

   en.wikipedia.org/wiki/Cable_tester

   A cable tester is an electronic device used to verify the electrical connections in a signal cable or other wired assembly. Basic cable testers are continuity testers that verify the existence of a conductive path between ends of the cable, and verify the correct wiring of connectors on the cable. More advanced cable testers can measure the ...

5. Copper cable certification - Wikipedia

   en.wikipedia.org/wiki/Copper_cable_certification

   An ideal skew is between 25 and 50 nanoseconds over a 100-meter cable. The lower this skew the better; less than 25 ns is excellent, but 45 to 50 ns is marginal. (Traveling between 50% and 80% of the speed of light, an electronic wave requires between 417 and 667 ns to traverse a 100-meter cable.

6. Time-domain reflectometer - Wikipedia

   en.wikipedia.org/wiki/Time-domain_reflectometer

   These traces were produced by a commercial TDR using a step waveform with a 25 ps risetime, a sampling head with a 35 ps risetime, and an 18-inch (0.46 m) SMA cable. [9] The far end of the SMA cable was left open or connected to different adapters. It takes about 3 ns for the pulse to travel down the cable, reflect, and reach the sampling head.

7. Ethernet physical layer - Wikipedia

   en.wikipedia.org/wiki/Ethernet_physical_layer

   50 Ω coaxial cable connects machines together, each machine using a T-connector to connect to its NIC. Requires terminators at each end. For many years during the mid to late 1980, this was the dominant Ethernet standard. Also called Thin Ethernet, Thinnet or Cheapernet. 10 Mbit/s over RG-58 coaxial cabling, bus topology with collision ...