Classification 

“Classification – Application classes for cabling have been identified for the purpose of ISO/IEC 11801 standard:
Class A cabling is characterized up to 100kHz
Class B cabling is characterized up to 1 MHz
Class C cabling is characterized up to 16 MHz
Class D cabling is characterized up to 100 MHz
Class E cabling is characterized up to 250 MHz
Class F cabling is characterized up to 600 MHz
Optical Class optical fiber links are characterized from 10 MHz and above.

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