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For cable runs exceeding 55 meters (180.5 feet) and to support 802.3bz MultiGig speeds (2.5GBASE-T and 5GBASE-T), it's recommended to use Cat-6a cabling. Cat-6a cables are designed to handle higher frequencies and provide better performance over longer distances compared to Cat-5e or Cat-6, making them suitable for MultiGig applications.

The CWDP-305 Official Study and Reference Guide highlights the importance of selecting appropriate cabling to support higher data rates:

"When deploying MultiGig Ethernet, especially for cable lengths exceeding 55 meters, Cat-6a cabling is recommended to ensure reliable performance and compliance with standards."