networking/pse-pd/introduction.rst

1 .. SPDX-License-Identifier: GPL-2.0
3 Power Sourcing Equipment (PSE) in IEEE 802.3 Standard
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9 Power Sourcing Equipment (PSE) is essential in networks for delivering power
11 switches and hubs that supply power to Powered Devices (PDs) such as IP
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18 power alongside data over Ethernet cables, typically associated with Power over
21 PoDL PSE, or Power over Data Lines PSE, specifically denotes PSEs operating
22 with single balanced twisted-pair PHYs, as per Clause 104 of IEEE 802.3. PoDL
23 is significant in contexts like automotive and industrial controls where power
26 IEEE 802.3-2018 Addendums and Related Clauses
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29 Key addenda to the IEEE 802.3-2018 standard relevant to power delivery over
32 - **802.3af (Approved in 2003-06-12)**: Known as PoE in the market, detailed in
33   Clause 33, delivering up to 15.4W of power.
34 - **802.3at (Approved in 2009-09-11)**: Marketed as PoE+, enhancing PoE as
35   covered in Clause 33, increasing power delivery to up to 30W.
36 - **802.3bt (Approved in 2018-09-27)**: Known as 4PPoE in the market, outlined
37   in Clause 33. Type 3 delivers up to 60W, and Type 4 up to 100W.
38 - **802.3bu (Approved in 2016-12-07)**: Formerly referred to as PoDL, detailed
39   in Clause 104. Introduces Classes 0 - 9. Class 9 PoDL PSE delivers up to ~65W
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47 - For general PSE (PoE) code, use "c33_pse" key words. For example:
51 - For PoDL PSE - specific code, use "podl_pse". For example:
55 Summary of Clause 33: Data Terminal Equipment (DTE) Power via Media Dependent Interface (MDI)
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59 characteristics of Powered Device (PD) and Power Sourcing Equipment (PSE).
60 These entities enable power delivery using the same generic cabling as for data
61 transmission, integrating power with data communication for devices such as
62 10BASE-T, 100BASE-TX, or 1000BASE-T.
64 Summary of Clause 104: Power over Data Lines (PoDL) of Single Balanced Twisted-Pair Ethernet
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68 characteristics of PoDL Powered Devices (PDs) and PoDL Power Sourcing Equipment
69 (PSEs). These are designed for use with single balanced twisted-pair Ethernet
72 for both data and the power required to process this data over a single
73 balanced twisted-pair Ethernet connection.