Ethernet Network PHY

PHY Type Notation

@desc@

Each type of PHY implement is specified by a three-fields notation.

$ <Data\ rate>\ <Modulation\ type>\ <Additional\ distinction> $ [a]

  • Data rate - if only a number, is in $Mb/s$, and if suffixed by a G, is in $Gb/s$. [b]
  • Modulation type - indicates how encoded data is transmitted on the medium.
    • BASE, BROAD, PASS – indicates baseband, broadband, or passband signaling respectively. [c]
  • Additional distinction - may identify characteristics of transmission or medium and, in some cases, the type of PCS encoding used.

    Table 1. Additional distinguishing symbols [d][e]

    Symbol Description
    T twisted pair
    S 850 nm short wavelength (multi-mode fiber)
    L 1300 nm long wavelength
    E or Z 1500 nm extra long wavelength (single-mode)
    B bidirectional optics
    P passive optical
    C copper/twinax
    K backplane
    F fiber
    H plastic optical fiber
    X 8b/10b block encoding (4B5B for Fast Ethernet)
    R large block encoding (64b/66b)

References

[a], [b] IEEE Standard for Ethernet. IEEE Std 802.3-2022 (Revision of IEEE Std 802.3-2018), 1. Introduction, 2022, pp.175.
[c], [d] Wikipedia contributors, 2023. Ethernet physical layer --- Wikipedia, The Free Encyclopedia.
[e] Rita Horner, 2017. 了解以太网术语 – 数据速率、互连介质和物理层.
Creation Date: 2023/02/27, Last modified: 2023/11/17, Author: Siyuan Liu

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