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Article | REF: S8162 V1

Ethernet as a field network: PROFINET standard

Author: Bruno BOUARD

Publication date: December 10, 2005 | Lire en français

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    5. Switched Ethernet technology. Fast Ethernet 100 Mbit/s

    Fast Ethernet on copper media has never been specified on coaxial cable, and therefore only exists on shielded twisted pairs; it's called 100BaseT. This requires the use of Category 5 cables that support signal transmission up to 100 MHz.

    5.1 Full-duplex links and collision disabling

    By imposing a minimum packet size of 64 bytes (to enable collision detection in all circumstances), the Ethernet standard is very penalizing for interactive traffic, where information does not exceed a dozen characters per packet. If the station has less than 64 bytes to transmit, it must complete the data with zeros.

    Since the first version of Ethernet, there have been major advances in operating speed, with speeds of 100 Mbit/s (Fast Ethernet) and even...

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