Lines Matching +full:system +full:- +full:power +full:- +full:controller
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
7 the architecture of Power over Ethernet (PoE) systems. It is essentially a
8 blueprint that outlines how one or multiple power sources are connected to the
9 eight-pin modular jack, commonly known as the Ethernet RJ45 port. This
10 connection scheme is crucial for enabling the delivery of power alongside data
14 ---------------------------
19 - Section "33.2.3 PI pin assignments" covers the pin assignments for PoE
20 systems that utilize two pairs for power delivery.
21 - Section "145.2.4 PSE PI" addresses the configuration for PoE systems that
22 deliver power over all four pairs of an Ethernet cable.
25 -------------------------------
28 connectivity, utilizing just one pair of conductors for both data and power
30 Ethernet, which can involve multiple power sourcing arrangements across four or
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
40 how Power Sourcing Equipment (PSE) delivers power to Powered Devices (PDs) over
41 Ethernet cables. It details two main configurations for power delivery, known
43 method of power transmission but also by the implications for polarity and data
47 ----------------------------
49 - **Alternative A:** Utilizes RJ45 conductors 1, 2, 3 and 6. In either case of
51 The power delivery's polarity in this alternative can vary based on the MDI
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 +---------+---------------+---------------------+-----------------------+
101 | Variant | Alternative | Power Feeding Type | Compatibility with |
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
118 Power on pinout Alternative B) is not compatible with a 4 pairs
121 PSE Power Interface (PSE PI) Connection Diagram
122 -----------------------------------------------
125 port, the Ethernet PHY (Physical Layer), and the PSE PI (Power Sourcing
126 Equipment Power Interface), demonstrating how power and data are delivered
129 the Ethernet PHY for data transmission and the PSE PI for power delivery.
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 ---------------------------------------------
157 The diagram below illustrates a straightforward PSE PI (Power Sourcing
158 Equipment Power Interface) configuration designed to support the Alternative A
159 setup for Power over Ethernet (PoE). This implementation is tailored to provide
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.
191 Alternative B, or to provide additional features such as power management, or
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 -----------------------------------------------------------
214 the intricacy of the Power over Ethernet (PoE) system's setup. Here are
216 this decision-making process:
219 In a straightforward scenario, the PSE PI setup involves a direct, one-to-one
220 connection between a single PSE controller and an Ethernet port. This setup
222 configuration or management of multiple power delivery modes. For such simple
223 configurations, detailing the PSE PI within the existing PSE controller's node
224 may suffice, as the system does not encompass additional complexity that
226 association of power delivery to a specific Ethernet port.
230 auxiliary circuits that collectively manage power delivery to one Ethernet
232 the capability to dynamically configure power delivery based on the operational
235 documenting the system architecture. This node would serve to detail the
237 modes, and any additional logic required to coordinate power delivery across
242 For simple PSE setups, including PSE PI information in the PSE controller node
247 representation of the PoE system's complexity.
250 ----------------------------------
252 The PSE PI (Power Sourcing Equipment Power Interface) node in a device tree can
253 include several key pieces of information critical for defining the power
254 delivery capabilities and configurations of a PoE (Power over Ethernet) system.
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,
265 focusing on power regulation.
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
282 directly, focusing instead on power flow regulation.
286 - *Description:* Lists the PoE standards and configurations supported by the
287 system.
288 - *Necessity:* Ensures system compatibility with various PDs and adherence
290 - *PSE Controller Node:* Specific capabilities may depend on the overall PSE
291 PI design rather than the controller alone. Multiple PSE cells per PI
296 - *Description:* Outlines additional protection mechanisms, such as
298 - *Necessity:* Provides extra safety and stability, complementing PSE
299 controller protections.
300 - *PSE Controller Node:* Some protections may be implemented via
301 board-specific hardware or algorithms external to the controller.