Why are only certain frequencies available?

Q: How far can I run Cat 6 cable?

ANSI/TIA-568.2-D limits a balanced twisted-pair channel to 100 m, made up of a 90 m permanent link plus up to 10 m of patch and equipment cords. The calculator flags any run length over 100 m as exceeding the channel limit regardless of category. Cat 6, Cat 6A, and Cat 5e all share this same 100 m channel maximum.

Q: What is insertion loss on a network cable?

Insertion loss is the signal attenuation across the run, expressed in decibels. This tool multiplies the TIA-568.2-D worst-case component limit (dB per 100 m at the selected frequency) by length / 100. These are planning limits — a real installed run measures lower, so always field-certify with a cable analyzer.

Question

Why are only certain frequencies available?

Accepted Answer

The calculator uses the standard TIA-568.2-D reference frequencies where horizontal-cable insertion-loss limits are tabulated, such as 1, 10, and 100 MHz for Cat 5e and up to 250 or 500 MHz for Cat 6 and Cat 6A. Each category only offers frequencies within its rated bandwidth, so you cannot enter an arbitrary value.

Why are only certain frequencies available?

Answers