Lines Matching +full:interface +full:- +full:node
1 .. SPDX-License-Identifier: GPL-2.0
3 PSE Power Interface (PSE PI) Documentation
6 The Power Sourcing Equipment Power Interface (PSE PI) plays a pivotal role in
9 eight-pin modular jack, commonly known as the Ethernet RJ45 port. This
14 ---------------------------
19 - Section "33.2.3 PI pin assignments" covers the pin assignments for PoE
21 - Section "145.2.4 PSE PI" addresses the configuration for PoE systems that
25 -------------------------------
31 two pairs of wires, SPE operates on a simpler model due to its single-pair
33 assignments for power delivery, as described in the PSE PI for multi-pair
37 --------------------
39 The Power Sourcing Equipment Power Interface (PSE PI) is a framework defining
47 ----------------------------
49 - **Alternative A:** Utilizes RJ45 conductors 1, 2, 3 and 6. In either case of
52 (Medium Dependent Interface) or MDI-X (Medium Dependent Interface Crossover)
55 - **Alternative B:** Utilizes RJ45 conductors 4, 5, 7 and 8. In case of
62 Table 145-3 PSE Pinout Alternatives
63 -----------------------------------
68 +------------+-------------------+-----------------+-----------------+-----------------+
70 | | (MDI-X) | (MDI) | (X) | (S) |
72 | 1 | Negative V | Positive V | - | - |
73 +------------+-------------------+-----------------+-----------------+-----------------+
74 | 2 | Negative V | Positive V | - | - |
75 +------------+-------------------+-----------------+-----------------+-----------------+
76 | 3 | Positive V | Negative V | - | - |
77 +------------+-------------------+-----------------+-----------------+-----------------+
78 | 4 | - | - | Negative V | Positive V |
79 +------------+-------------------+-----------------+-----------------+-----------------+
80 | 5 | - | - | Negative V | Positive V |
81 +------------+-------------------+-----------------+-----------------+-----------------+
82 | 6 | Positive V | Negative V | - | - |
83 +------------+-------------------+-----------------+-----------------+-----------------+
84 | 7 | - | - | Positive V | Negative V |
85 +------------+-------------------+-----------------+-----------------+-----------------+
86 | 8 | - | - | Positive V | Negative V |
87 +------------+-------------------+-----------------+-----------------+-----------------+
90 - "Positive V" and "Negative V" indicate the voltage polarity for each pin.
91 - "-" indicates that the pin is not used for power delivery in that
95 ----------------------
100 +---------+---------------+---------------------+-----------------------+
105 +---------+---------------+---------------------+-----------------------+
107 +---------+---------------+---------------------+-----------------------+
109 +---------+---------------+---------------------+-----------------------+
112 - "Direct" indicate a variant where the power is injected directly to pairs
114 - "Phantom" indicate power path over coils/magnetics as it is done for
121 PSE Power Interface (PSE PI) Connection Diagram
122 -----------------------------------------------
126 Equipment Power Interface), demonstrating how power and data are delivered
128 interface for these connections, with each of its eight pins connected to both
131 .. code-block::
133 +--------------------------+
137 +--+--+--+--+--+--+--+--+--+ +-------------+
139 | | | | | | | o-------------------+ |
140 | | | | | | o--|-------------------+ +<--- PSE 1
141 | | | | | o--|--|-------------------+ |
142 | | | | o--|--|--|-------------------+ |
143 | | | o--|--|--|--|-------------------+ PSE PI |
144 | | o--|--|--|--|--|-------------------+ |
145 | o--|--|--|--|--|--|-------------------+ +<--- PSE 2 (optional)
146 o--|--|--|--|--|--|--|-------------------+ |
148 +--+--+--+--+--+--+--+--+--+ +-------------+
152 +--------------------------+
155 ---------------------------------------------
158 Equipment Power Interface) configuration designed to support the Alternative A
160 power delivery through the data-carrying pairs of an Ethernet cable, suitable
161 for either MDI or MDI-X configurations, albeit supporting one variation at a
164 .. code-block::
166 +-------------+
168 8 -----+ +-------------+
169 7 -----+ Rail 1 |
170 6 -----+------+----------------------+
171 5 -----+ | |
172 4 -----+ | Rail 2 | PSE 1
173 3 -----+------/ +------------+
174 2 -----+--+-------------/ |
175 1 -----+--/ +-------------+
177 +-------------+
181 - Pins 1 and 2, as well as pins 3 and 6, are utilized for power delivery in
184 - Rail 1 and Rail 2 represent the positive and negative voltage rails, with
188 compatibility with both MDI and MDI-X configurations.
192 additional power delivery capabilities such as 2-pair or 4-pair power delivery.
194 .. code-block::
196 +-------------+
198 | +---+
199 8 -----+--------+ | +-------------+
200 7 -----+--------+ | Rail 1 |
201 6 -----+--------+ +-----------------+
202 5 -----+--------+ | |
203 4 -----+--------+ | Rail 2 | PSE 1
204 3 -----+--------+ +----------------+
205 2 -----+--------+ | |
206 1 -----+--------+ | +-------------+
207 | +---+
208 +-------------+
211 -----------------------------------------------------------
213 The necessity for a separate PSE PI node in the device tree is influenced by
216 this decision-making process:
219 In a straightforward scenario, the PSE PI setup involves a direct, one-to-one
223 configurations, detailing the PSE PI within the existing PSE controller's node
225 warrants a separate node. The primary focus here is on the clear and direct
234 these instances, a dedicated PSE PI node becomes essential for accurately
235 documenting the system architecture. This node would serve to detail the
242 For simple PSE setups, including PSE PI information in the PSE controller node
245 benefit from a dedicated PSE PI node. This method adheres to IEEE 802.3
249 PSE PI Node: Essential Information
250 ----------------------------------
252 The PSE PI (Power Sourcing Equipment Power Interface) node in a device tree can
256 necessity and reasons why they might not be found within a PSE controller node:
260 - *Description:* Identifies the pairs used for power delivery in the
262 - *Necessity:* Essential to ensure the correct pairs are powered according
264 - *PSE Controller Node:* Typically lacks details on physical pair usage,
269 - *Description:* Specifies the polarity (positive or negative) for each
271 - *Necessity:* Critical for safe and effective power transmission to PDs.
272 - *PSE Controller Node:* Polarity management may exceed the standard
277 - *Description:* Details the association of PSE cells with Ethernet ports or
278 pairs in multi-cell configurations.
279 - *Necessity:* Allows for optimized power resource allocation in complex
281 - *PSE Controller Node:* Controllers may not manage cell associations
286 - *Description:* Lists the PoE standards and configurations supported by the
288 - *Necessity:* Ensures system compatibility with various PDs and adherence
290 - *PSE Controller Node:* Specific capabilities may depend on the overall PSE
296 - *Description:* Outlines additional protection mechanisms, such as
298 - *Necessity:* Provides extra safety and stability, complementing PSE
300 - *PSE Controller Node:* Some protections may be implemented via
301 board-specific hardware or algorithms external to the controller.