What is the International Organization for Standardization/International Electrotechnical Commission ISO/IEC class rating for American National Standards Institute/Telecommunication Industry…

Class B corresponds to cabling performance up to 1 MHz, associated with Category 1/2 applications, which is far below Category 5e's 100 MHz requirement.

Class C corresponds to Category 3 cabling with a frequency performance limit of 16 MHz, which does not meet the 100 MHz threshold of Category 5e.

ISO/IEC 11801 establishes a class-based cabling system using letter designations that align with TIA category ratings for international interoperability. Class D is specifically defined to support frequencies up to 100 MHz, which directly corresponds to the ANSI/TIA Category 5e specification. This mapping is normatively referenced in both ISO/IEC 11801 and ANSI/TIA-568 to ensure cross-standard compatibility.

Class E corresponds to Category 6 cabling rated to 250 MHz, which exceeds the Category 5e specification and is a separate, higher-performance class.

Class F corresponds to Category 7 shielded cabling rated to 600 MHz, a significantly higher-performance class than Category 5e.