If the accepted distance limitation of a 1000BASE-T Ethernet connection is ignored and the frames are sent over a 300 meter Cat5e cable segment, the transmission speed will drop considerably.
Cat 5e utp cable models are manufactured for infrastructure applications; they provide the networks that use them with the ability to transfer data securely, without packet loss and without any loss of speed during operations.
Both specify Ethernet communication but 1000BASE-T at 1 Gb/s and both are designed to run on four-pair, 100 ohm impedance twisted-pair cables, up to 100 meters.
From these information, we can conclude that if the accepted distance limitation of a 1000BASE-T Ethernet connection is ignored and the frames are sent over a 300 meter Cat5e cable segment, the transmission speed will drop considerably.
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