Worst-Case Cable for Jitter
1000BASE-T/100BASE-TX/10BASE-T Physical Layer Compliance Tests Manual
108 Intel Confidential
6. Place the wires at each end of each cable in the correct order for the crimp-on connectors.
7. Trim the wire ends to equals lengths.
8. Slide the 3/8-inch or 1/2-inch heat shrink tubing down to the connectors and shrink them by
applying heat.
9. Crimp the male RJ-45 connectors onto the cable.
Note: This procedure has been used to construct unshielded 120-ohm impedance twisted pair cable.
However, it is not recommended for the following reasons:
1. The required calculations only approximate the desired target impedance. They do not take
into account the loading effects of the adjacent twisted pairs.
2. It is labor intensive. The individual pairs need to be twisted to a consistent number of twists
per foot and wrapped with an insulator.
3. Post construction testing is rigorous. Measurements are required for all four channels.
The following tables provide additional information regarding Jitter test cable.
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