A network engineer is retrofitting an existing building wired with Category 5e with AP 3800 and mGig switches. Which cable length allows for 5G operation?

The correct answer is A. 70 m. Multi-Gigabit (mGig) Ethernet is defined by IEEE 802.3bz, which introduced 2.5GBASE-T and 5GBASE-T to operate over existing Cat5e/Cat6 cabling. While standard 1000BASE-T supports 100m runs on Cat5e, 5GBASE-T over Cat5e has a reduced maximum cable length of approximately 70…

Wireless Infrastructure

Question

Options

A70 m
B120 m
C130 m
D150 m

How the community answered

(37 responses)

A
95% (35)
B
3% (1)
C
3% (1)

Explanation

Multi-Gigabit (mGig) Ethernet is defined by IEEE 802.3bz, which introduced 2.5GBASE-T and 5GBASE-T to operate over existing Cat5e/Cat6 cabling. While standard 1000BASE-T supports 100m runs on Cat5e, 5GBASE-T over Cat5e has a reduced maximum cable length of approximately 70 meters due to the higher frequency signaling required. This is the key tradeoff that allows 5G speeds on legacy Cat5e infrastructure without full recabling-but only within that 70m limit. Longer runs (120m, 130m, 150m) exceed the Cat5e capability for 5G operation and would require Cat6a or a speed downgrade to 2.5G or 1G to function reliably.

Topics

#multigigabit#Category 5e#cable length#AP 3800

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