CN104954145B - Ethernet power supply method, power supply equipment and Ethernet power supply system - Google Patents
Ethernet power supply method, power supply equipment and Ethernet power supply system Download PDFInfo
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- CN104954145B CN104954145B CN201410124490.6A CN201410124490A CN104954145B CN 104954145 B CN104954145 B CN 104954145B CN 201410124490 A CN201410124490 A CN 201410124490A CN 104954145 B CN104954145 B CN 104954145B
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Abstract
The invention discloses a power over Ethernet method.A power supply device acquires power supply information of an Ethernet port, wherein the power supply information comprises a powered device state; if the powered device state of the Ethernet port is invalid, detecting the powered device connected with the power supply device through the Ethernet port, and when the powered device is confirmed to be valid, setting the powered device state of the Ethernet port to be valid, and powering on the powered device; if the powered device state of the Ethernet port is valid, the powered device is directly powered on, and the powered device can be powered on and started quickly. The invention also provides a power supply device and an Ethernet power supply system.
Description
Technical Field
The present invention relates to the field of network communications, and in particular, to a power over ethernet method, a power supply device, and a power over ethernet system.
Background
A Power over Ethernet (PoE) device includes a Power Sourcing Equipment (PSE) and a Powered Device (PD). The power sourcing equipment may provide power to the powered device in different sizes, e.g., 15.4 watts (english: watt, symbol: W), 30W, etc.
In recent years, PoE technology is more and more widely applied, the types of powered devices are more and more abundant, and many powered devices require that the power-on starting time is less than 100 milliseconds to improve the customer experience. However, the process of powering on the powered device by the power supply device is complex, so that the time required for powering on and starting the powered device is usually about 1 second, and the rapid powering on requirement of the PD cannot be met.
Disclosure of Invention
The embodiment of the invention provides a method for power over Ethernet, power supply equipment and a power over Ethernet system, wherein the power supply equipment detects and then supplies power to the power receiving equipment which is accessed for the first time, so that the reliability of power over Ethernet can be improved, the power is directly supplied to the power receiving equipment which is not accessed for the first time, and the power-on starting time of the power receiving equipment can be shortened.
In a first aspect, a method for power over ethernet is provided, including:
the power supply equipment acquires power supply information of an Ethernet port of the power supply equipment, wherein the power supply information comprises a powered equipment state;
if the powered device state of the Ethernet port is invalid, the power supply device detects the powered device connected with the power supply device through the Ethernet port, and when the powered device is confirmed to be valid, the power supply device sets the powered device state of the Ethernet port to be valid and powers on the powered device;
and if the state of the powered device of the Ethernet port is valid, the power supply device directly powers on the powered device.
In a first possible implementation manner of the first aspect, after the power is supplied to the power receiving apparatus, the method further includes: the power supply equipment monitors the physical connection of the Ethernet port, and if the physical connection of the Ethernet port is monitored to be disconnected, the power supply equipment sets the state of the powered equipment of the Ethernet port to be invalid.
According to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the monitoring, by the power sourcing equipment, a physical connection of the ethernet port includes:
after the power supply device stops supplying power to the powered device, the power supply device continuously detects whether the powered device connected to the Ethernet port is valid or not so as to judge whether the physical connection of the Ethernet port is disconnected or not.
According to the first aspect and any one of the first and second possible implementation manners of the first aspect, in a third possible implementation manner of the first aspect, when the powered device state of the ethernet port is invalid, after the power sourcing equipment detects the powered device, and confirms that the powered device is a valid powered device, and before the power sourcing equipment powers on the powered device, the method further includes:
the power supply equipment acquires the classification information of the powered equipment through physical layer classification;
and storing the acquired classification information of the powered device into power supply information of the Ethernet port, wherein the power supply information further comprises classification information.
According to the first aspect and any one of the first and second possible implementation manners of the first aspect, in a fourth possible implementation manner of the first aspect, after the power supply device powers on the powered device, the method further includes:
the power supply equipment acquires the classification information of the powered equipment through link layer classification;
and storing the acquired classification information of the powered device into power supply information of the Ethernet port, wherein the power supply information further comprises classification information.
In a second aspect, a power supply device is provided, which includes an obtaining module, a detecting module, a setting module and a power supply module;
the acquiring module is configured to acquire power supply information of an ethernet port of the power supply device, where the power supply information includes a powered device state;
the detection module is configured to detect, when the powered device state of the ethernet port is invalid, a powered device connected to the power sourcing equipment through the ethernet port, so as to determine whether the powered device is a valid powered device;
the setting module is configured to set a powered device state of the ethernet port to be valid when the detection module determines that the powered device is a valid powered device;
the power supply module is configured to power on the powered device of the ethernet port when the powered device status is valid.
In a first possible implementation manner of the second aspect, the power supply device further includes a monitoring module;
the monitoring module is used for monitoring the physical connection of the Ethernet port;
the setting module is further configured to set a state of a powered device of the ethernet port to be invalid when the monitoring module monitors that the physical connection of the ethernet port is disconnected.
According to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the power supply device further includes a physical layer classification module and a storage module;
the physical layer classification module is configured to, when the powered device status of the ethernet port is invalid, obtain classification information of the powered device through physical layer classification after the detection module determines that the powered device is a valid powered device and before the power supply module powers on the powered device;
the storage module is configured to store the classification information of the powered device, which is obtained by the classification module, in power supply information of the ethernet port, where the power supply information further includes classification information.
In a second possible implementation manner of the second aspect, the power supply device further includes a data link layer classification module and a storage module;
the data link layer classification module is configured to obtain classification information of the powered device through data link layer classification after the power supply device powers on the powered device;
the storage module is configured to store the classification information of the powered device, which is obtained by the data link layer classification module, in power supply information of the ethernet port, where the power supply information further includes classification information.
In a third aspect, a power supply device is provided, which includes a processor, a memory, an ethernet port, a power supply circuit and a power supply device PSE chip;
the power supply circuit is connected with the Ethernet port;
the power supply circuit is connected with the PSE chip;
the processor is connected with the PSE chip;
the processor is connected with the memory;
the power receiving equipment is connected with the power supply equipment through the Ethernet port;
the processor acquires power supply information of an Ethernet port of the power supply equipment from the memory, wherein the power supply information comprises a powered equipment state;
when the powered device state of the Ethernet port is invalid, the processor instructs the PSE chip to detect the powered device, and when the powered device is determined to be a valid powered device, the processor sets the powered device state of the Ethernet port in the memory to be valid and instructs the power supply circuit to power on the powered device;
and under the condition that the state of the powered device of the Ethernet port is effective, the processor instructs the power supply circuit to directly power on the powered device.
In a first possible implementation manner of the third aspect, the processor monitors a physical connection of the ethernet port; and if the physical connection disconnection of the Ethernet port is monitored, the processor sets the state of the powered device of the Ethernet port in the memory to be invalid.
According to the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, when the powered device state of the ethernet port is invalid,
the processor is at the instruction the detection circuitry is right the powered device detects, confirms that the powered device is effectual powered device after, and at the instruction the power supply circuit is right before the powered device is powered on, acquires through the physical layer classification the hierarchical information of powered device, and will acquire the hierarchical information of powered device is saved in the memory in the power supply information of ethernet port, the power supply information still includes hierarchical information.
According to the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, after instructing the power supply circuit to power on the powered device, the processor obtains classification information of the powered device through link layer classification, and stores the obtained classification information of the powered device in the power supply information of the ethernet port in the memory, where the power supply information further includes classification information.
In a fourth aspect, a power over ethernet system is provided, including the above power sourcing equipment and a powered device, where the powered device is connected to the power sourcing equipment through an ethernet port of the power sourcing equipment.
In the method for power over ethernet provided in the embodiment of the present invention, a power supply device stores power supply information of an ethernet port, where the power supply information includes a state of a powered device, and when the power supply device is ready to supply power to the powered device connected to the power supply device through the ethernet port, the power supply device determines, according to the state of the powered device of the ethernet port, whether the powered device is first connected to the power supply device; if the powered device state of ethernet port is invalid, shows to insert for the first time, then power supply unit is electrified to this powered device again after detecting this powered device for effectual powered device, can avoid to power on invalid powered device, damages equipment, has improved the reliability of ethernet power supply, and through will save the powered device state of ethernet port is valid, when secondary again for this powered device power supply, the powered device state of ethernet port is effective, shows not to insert for the first time, then power supply unit directly is electrified for this powered device, can shorten powered device's power-on time, realizes powered device's quick power-on and start to promote powered device's use impression.
Drawings
Fig. 1 is a flowchart of a power over ethernet method according to an embodiment of the present invention;
fig. 2 is a flowchart of another power over ethernet method provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a power supply device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another power supply device provided in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of another power supply device provided in the embodiment of the present invention;
fig. 6 is a schematic diagram of a hardware structure of a power supply device according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the embodiments of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings and the detailed description.
An embodiment of the present invention provides a method for supplying power over ethernet, as shown in fig. 1, including:
101. the power supply equipment PSE obtains power supply information of an Ethernet port of the PSE.
The power supply information includes a powered device state. The power supply information may further include classification information.
The power supply equipment PSE in the embodiment of the present invention may be a switch or a router supporting PoE. A typical power sourcing equipment PSE includes a PSE chip. PSE chips are chips designed to meet the PSE functionality in PoE protocol requirements and typically provide detection and classification functionality.
When the PSE is ready to supply power to the ethernet port, the PSE first obtains power supply information of the ethernet port stored in the PSE, and determines whether a powered device state of the ethernet port is valid. In particular, the power supply information of the ethernet port may be stored in a memory of the PSE, from which the PSE retrieves the power supply information of the ethernet port. Optionally, the power supply device stores a correspondence between the ethernet port and the power supply information in a memory.
102. If the powered device state of ethernet port is invalid, the PSE is to passing through the ethernet port with the powered device that the PSE is connected detects, when confirming the powered device is effectual powered device, the PSE will the powered device state of ethernet port is set as valid, and right powered device is electrified.
The powered device is connected to the PSE through the ethernet port.
After the PSE acquires the power supply information of the ethernet port, if the powered device state of the ethernet port is invalid, it can be considered that the powered device is first accessed to the PSE through the ethernet port, the PSE performs power-on detection on the powered device to determine whether the powered device is a valid powered device; when the powered device is determined to be a valid powered device, the PSE sets the saved (e.g., saved in its memory) powered device state of the ethernet port to valid, and powers up the powered device, so that the powered device starts up and enters an operating state.
Wherein, the power-on detection means that the PSE inputs two detection voltages with different voltage amplitudes, for example, detection voltages with any two different voltage amplitudes between 2.8V and 10V, to the ethernet port to be detected at a certain time interval (which can be set as required), for example, 100ms, and determines the resistance of the powered device to be detected according to the ratio of the detected voltage to the detected current, and according to the standard, the effective powered device has a characteristic resistance between 19 kiloohm (english: kilohm, symbol: k Ω) and 26.5k Ω; therefore, if the resistance of the to-be-detected powered device is detected to be between 19k Ω and 26.5k Ω, the to-be-detected powered device can be determined to be a valid powered device; if the resistance of the to-be-detected powered device is detected to be less than 15k Ω or greater than 33k Ω, the to-be-detected powered device can be determined to be an invalid powered device.
Optionally, after the PSE detects the powered device, and confirms that the powered device is a valid powered device, and before the power supply device powers on the powered device, the PSE measures a classification current by Physical Layer classification (i.e., adding a classification voltage to the ethernet port), and obtains classification information of the powered device; and storing the obtained grading information of the powered device into the power supply information of the Ethernet port. Or, optionally, after the PSE powers on the powered device, the PSE performs Link Layer classification (Data Link classification), that is, after a Data Link (Data Link) between the PSE and the powered device is established, the PSE communicates with the powered device using a Data Link Layer Protocol (Data Link Protocol), for example, a Link Layer Discovery Protocol (LLDP), to obtain classification information of the powered device, and stores the obtained classification information of the powered device in power supply information of the ethernet port, for example, in table 1 of a memory of the PSE.
The PSE may store a correspondence between the ethernet port and the power supply information using a correspondence table. The correspondence table may be stored in a memory of the PSE. In a specific implementation, the powered device status of the ethernet port may include an invalid status and a valid status; in an initial state, the powered device states of the Ethernet ports of the PSE are all set to be invalid by default. Of course, in a specific implementation, the powered device status of the ethernet port may include other statuses besides invalid and valid, such as null; in the initial state, the powered device status of the ethernet port may be null or invalid. In the embodiment of the invention, the conditions that the states of the power receiving equipment of the Ethernet port are not valid can be considered as invalid; if the powered device status of the ethernet port is empty, the process may be performed in the same manner as if the powered device status of the ethernet port is invalid. The invention is not limited in this regard.
The correspondence table may include an identifier of the ethernet port and power supply information, where the identifier of the ethernet port may be a port number, and the power supply information includes a powered device state, classification information, and the like, as shown in table 1.
TABLE 1
The first time the powered device accesses the PSE through the ethernet port may be the following:
first, the powered device is a historical powered device that is first accessed to the PSE through the ethernet port;
second, the physical connection of the Ethernet port was broken; in this case, it is possible that the powered device is still a powered device that is accessed to the PSE through the ethernet port before the physical connection is broken; for example, the powered device is plugged/unplugged, which results in the physical connection of the ethernet port being disconnected. It is also possible that the powered device is not the same device as the powered device that was previously connected to the PSE through the ethernet port before the physical connection was broken, and the powered device is newly connected to the powered device of the PSE through the ethernet port.
103. And if the state of the powered device of the Ethernet port is valid, the PSE directly powers on the powered device.
The PSE directly powers on the powered device means that the PSE skips a power-on detection stage to power on the powered device.
After the PSE acquires the power supply information of the ethernet port, if the powered device state of the ethernet port is valid, it can be considered that the powered device is not first accessed to the PSE, and the PSE directly powers on the powered device to realize the rapid power-on start of the powered device.
Further, after the PSE powers up the powered device, the method may further include: the PSE obtains classification information of the powered device by link layer classification, i.e., after a data link between the PSE and the powered device is established, the PSE communicates with the powered device using a data link layer protocol, such as LLDP, and stores the obtained classification information of the powered device in power supply information of the ethernet port.
Specifically, if the power supply information of the ethernet port does not include the classification information of the powered device, the PSE obtains the classification information of the powered device through link layer classification, and stores the obtained classification information of the powered device in the power supply information of the ethernet port. Or, regardless of whether the power supply information of the ethernet port includes the classification information of the powered device, the PSE obtains the classification information of the powered device through link layer classification, and stores/updates the obtained classification information of the powered device in the power supply information of the ethernet port.
Further, the PSE may set a supply current upper threshold of the powered device according to the obtained classification information of the powered device. The PSE may also sense (english: sense) the power supply current on the ethernet port in real time, and if the power supply current on the ethernet port exceeds the above-mentioned set upper threshold of the power supply current of the powered device, the PSE may process according to a preset power supply policy, where the preset power supply policy includes stopping power supply, issuing an alarm (for example, a speaker issues an alarm in the form of a sound, or an indicator light or a display issues an alarm in the form of a light, or a preset mobile phone number in the form of a short message, or an email address in the form of an email, etc.), recording logs, and the like.
Further, as shown in fig. 2, after the PSE powers on the powered device, the method may further include:
104. the PSE monitors the physical connection of the Ethernet port;
in particular, the PSE continuously monitors whether the physical connection of the ethernet port is broken.
105. If the physical connection of the Ethernet port is detected to be disconnected, the PSE sets the state of a powered device of the Ethernet port to be invalid;
optionally, the PSE may also flush the powered device state of the ethernet port.
If the physical connection of the Ethernet port is not broken, the PSE may continue to supply power to the PD or stop supplying power. When the PSE stops supplying power to the powered device, the PSE maintains the saved powered device state of the Ethernet port unchanged.
Specifically, the PSE continuously monitors whether the physical connection of the ethernet port is broken during and after the power supply to the powered device is stopped. Therefore, the PSE can ensure the real-time update of the state of the powered device of the Ethernet port, and the effectiveness and the reliability of the state of the powered device of the Ethernet port are improved.
In the process that the PSE supplies power to the powered device, the PSE may measure a return current value of the ethernet port through a PSE chip, and determine whether the physical connection of the ethernet port is disconnected according to whether the return current value is continuously smaller than a minimum threshold, for example, 5-10 milliamperes (symbol: mA), and exceeds a preset time threshold, for example, 300-.
In the embodiment of the present invention, after the PSE stops supplying power to the powered device, the PSE may monitor whether the physical connection of the ethernet port is disconnected through two methods, which are specifically as follows:
firstly, the PSE continuously performs power-on detection on the powered device, and detects whether the powered device is an effective resistance specified by a standard, for example, 25 kilo-ohms (k Ω), to determine whether the powered device is disconnected. If the effective resistance is not specified by the standard, the powered device is judged to be disconnected, and the physical connection of the Ethernet port can be considered to be disconnected; if the effective resistance specified by the standard is detected, it is determined that the powered device is not disconnected, i.e. remains connected to the ethernet port, and the physical connection of the ethernet port may be considered not to be disconnected. Specifically, the power-on detection process is as described above.
And the PSE comprises a monitoring circuit for monitoring whether the physical connection of the Ethernet port is disconnected. The monitoring circuit is not limited in the present invention as long as the object of the present invention can be achieved.
In the ethernet power supply method provided in the embodiment of the present invention, a power supply device obtains a powered device state of an ethernet port of the power supply device, and if the powered device state of the ethernet port is invalid, the power supply device detects a powered device connected to the power supply device through the ethernet port, and when it is determined that the powered device is a valid powered device, the power supply device sets the powered device state of the ethernet port to valid and powers on the powered device; and if the state of the powered device of the Ethernet port is valid, the power supply device directly powers on the powered device. In this way, the power supply device, by saving the state of the power receiving device of the ethernet port, when the power supply device is ready to supply power to the power receiving device connected to the power supply device through the ethernet port, determines whether the power receiving device is first connected to the power supply device according to the state of the power receiving device of the ethernet port, and directly powers on the power receiving device if the power receiving device is not first connected, so that the power receiving device can be powered on and started quickly; if the power receiving equipment is accessed for the first time, the power receiving equipment is powered on after effectiveness detection is carried out on the power receiving equipment, the reliability of Ethernet power supply is improved, and the power receiving equipment which is not effective can be prevented from being powered on and damaging the equipment.
An embodiment of the present invention provides a power supply device, and as shown in fig. 3, the power supply device 30 includes an obtaining module 301, a detecting module 302, a setting module 303, and a power supply module 304, and is configured to implement the power over ethernet method shown in fig. 1 of the present invention.
The powered device is connected to the power sourcing equipment 30 via an ethernet port of the power sourcing equipment 30.
The power supply device in the embodiment of the invention can be a switch or a router supporting PoE.
The obtaining module 301 is configured to obtain power supply information of the ethernet port, where the power supply information includes a powered device state;
the detecting module 302 is configured to detect the powered device of the ethernet port when the powered device status is invalid, so as to determine whether the powered device is a valid powered device;
the setting module 303 is configured to set a powered device state of the ethernet port to be valid when the detection module 302 determines that the powered device is a valid powered device;
the power supply module 304 is configured to supply power to the powered device of the ethernet port when the powered device status is valid.
When the power sourcing equipment 30 is ready to supply power to the ethernet port, the obtaining module 301 first obtains the power sourcing information of the ethernet port stored therein, and determines whether the powered device status of the ethernet port is valid. Specifically, the power supply information of the ethernet port may be stored in a memory of the power supply device 30, and the obtaining module 301 obtains the power supply information of the ethernet port from the memory of the power supply device 30.
After the power supply information of the ethernet port is acquired, if the powered device state of the ethernet port is valid, it may be considered that the powered device is not first connected to the power supply device 30, and the power supply module 304 directly powers on the powered device, so as to implement the fast power-on start of the PD. If the powered device status at the ethernet port is invalid, it may be considered that the powered device is first accessed to the power sourcing equipment 30 through the ethernet port, and the detecting module 302 performs power-on detection on the powered device to determine whether the powered device is a valid powered device; when it is determined that the powered device is a valid powered device, the setting module 303 sets the saved (e.g., saved in the memory) powered device state of the ethernet port to be valid, and the power supply module 304 powers on the powered device, so that the powered device is started to enter the working state.
Directly powering on the powered device means that the power supply device 30 skips a power-on detection stage to power on the powered device.
The power-on detection means that the detection module 302 inputs two detection voltages with different voltage amplitudes, for example, detection voltages with any two different voltage amplitudes between 2.8V and 10V, to the ethernet port to be detected at a certain time interval (which may be set as required), for example, 100ms, and determines the resistance of the PD to be detected according to the ratio of the detected voltage to the detected current, and according to the standard, the effective powered device has a characteristic resistance between 19k Ω and 26.5k Ω; therefore, if the resistance of the to-be-detected powered device is detected to be between 19k Ω and 26.5k Ω, the to-be-detected powered device can be determined to be a valid powered device; if the resistance of the to-be-detected powered device is detected to be less than 15k Ω or greater than 33k Ω, the to-be-detected powered device can be determined to be an invalid powered device.
The first time the powered device accesses the power sourcing equipment 30 through the ethernet port may be as follows:
first, the powered device is a historical powered device that is first accessed to the power sourcing equipment through the ethernet port 3A;
secondly, the physical connection of the Ethernet terminal is broken once; in this case, the powered device may still be a powered device that is connected to the power sourcing equipment through the ethernet port before the physical connection is broken; for example, the powered device is plugged/unplugged, which results in the physical connection of the ethernet port being disconnected. It is also possible that the powered device is not the same device as the powered device that was connected to the power sourcing equipment through the ethernet port before the physical connection was broken, and the powered device is newly connected to the powered device of the PSE through the ethernet port.
The power supply device 30 may use a corresponding relationship table to store the corresponding relationship between the ethernet port and the power supply information. The correspondence table may be stored in a memory of the PSE. In a specific implementation, the powered device status of the ethernet port may include an invalid status and a valid status; in the initial state, the powered device status of the ethernet port of the power sourcing equipment 30 is set to be invalid by default. Of course, in a specific implementation, the powered device status of the ethernet port may include other statuses besides invalid and valid, such as null; in the initial state, the powered device status of the ethernet port may be null or invalid. In the embodiment of the invention, the conditions that the states of the power receiving equipment of the Ethernet port are not valid can be considered as invalid; if the powered device status of the ethernet port is empty, the process may be performed in the same manner as if the powered device status of the ethernet port is invalid. The invention is not limited in this regard.
The correspondence table may include an identifier of the ethernet port and power supply information, where the identifier of the ethernet port may be a port number or a port address, and the power supply information includes a powered device state, classification information, and the like, as shown in table 1.
As shown in fig. 4, the power supply device 30 may further include a monitoring module 305 for monitoring the physical connection of the ethernet port.
Specifically, the monitoring module 305 continuously monitors whether the physical connection of the ethernet port is disconnected during the power supply of the power supply device to the powered device and after the power supply of the powered device is stopped. In this way, the power sourcing equipment 30 can update the powered device status of the ethernet port in real time, and the effectiveness and reliability of the powered device status of the ethernet port are improved.
The setting module 303 is further configured to set the powered device state of the ethernet port to be invalid when the monitoring module 305 monitors that the physical connection of the ethernet port is disconnected. Optionally, the setting module 303 may also clear the powered device status of the ethernet port.
If the monitoring module 305 monitors that the physical connection of the ethernet port is not disconnected, the power supply apparatus 30 can continue to supply power to the powered device or stop supplying power. When the power supply apparatus 30 stops supplying power to the power receiving apparatus, the power supply apparatus 30 maintains the saved power receiving apparatus state of the ethernet port.
In the process that the power supply device supplies power to the powered device, the monitoring module 305 is specifically configured to determine whether the physical connection of the ethernet port is disconnected according to whether the current value of the ethernet port is continuously smaller than a minimum threshold and exceeds a preset time threshold.
In this embodiment of the present invention, after the power supply device 30 stops supplying power to the powered device, the monitoring module 305 may monitor whether the physical connection of the ethernet port is disconnected through two methods, which are specifically as follows:
first, the monitoring module 305 instructs the detecting module 302 to continuously perform power-on detection on the powered device, and detect whether the powered device is an effective resistance specified by a standard, for example, 25 kilo-ohms (k Ω), to determine whether the powered device is disconnected. If the effective resistance is not specified by the standard, the powered device is judged to be disconnected, and the physical connection of the Ethernet port can be considered to be disconnected; if the effective resistance specified by the standard is detected, it is determined that the powered device is not disconnected, i.e. remains connected to the ethernet port, and the physical connection of the ethernet port may be considered not to be disconnected. Specifically, the power-on detection process is as described above.
The power supply device 30 includes a monitoring circuit, and the monitoring module 305 monitors whether the physical connection of the ethernet port is disconnected through the monitoring circuit. The monitoring circuit is not limited in the present invention as long as the object of the present invention can be achieved.
Further, as shown in fig. 5, the power supply device 30 may further include a physical layer classification module 306 and a storage module 307;
the physical layer classification module 306 is configured to, when the powered device status of the ethernet port is invalid, obtain classification information of the powered device through physical layer classification after the detection module 302 determines that the powered device is a valid powered device and before the power-up module 304 powers up the powered device, that is, adding a classification voltage to the ethernet port and measuring a classification current;
the storage module 307 is configured to store the classification information of the powered device, which is obtained by the classification module 306, in power supply information of the ethernet port, for example, in table 1 of the memory of the power supply device 30, where the power supply information further includes the classification information.
Optionally, the power supply device 30 may further include a data link layer classification module 308, configured to obtain classification information of the power receiving device through data link layer classification after the power supply device supplies power to the power receiving device, that is, after a data link (english: data link) between the power supply device 30 and the power receiving device is established, the power supply device communicates with the power receiving device by using a data link layer protocol, such as LLDP;
the storage module 307 may be further configured to store the classification information of the powered device, obtained by the data link layer classification module 308, into the power supply information of the ethernet port.
Further, the power supply device 30 further includes an overcurrent protection module, configured to set a power supply current upper limit threshold of the powered device according to the classification information of the powered device obtained by the physical layer classification module 306 or the data link layer classification module 308, and sense the power supply current on the ethernet port in real time, if the supply current on the ethernet port exceeds the above-set upper supply current threshold of the powered device, the processing is performed according to a preset power supply strategy, which includes stopping power supply, issuing an alarm (e.g., an alarm in the form of a sound emitted by a speaker, or an alarm in the form of a light emitted by an indicator light or a display, or an alarm in the form of a short message according to a preset mobile phone number, or an alarm in the form of an email according to a preset email address, etc.), logging, etc.
According to the power supply equipment provided by the embodiment of the invention, by saving the state of the power receiving equipment of the Ethernet port, when the power receiving equipment connected with the power supply equipment through the Ethernet port is ready to be supplied with power, whether the power receiving equipment is firstly connected to the power supply equipment can be judged according to the state of the power receiving equipment of the Ethernet port, and if the power receiving equipment is not firstly connected, the power receiving equipment is directly powered on, so that the power receiving equipment can be quickly powered on and started; if the power receiving equipment is accessed for the first time, the power receiving equipment is powered on after being detected, the reliability of Ethernet power supply is improved, and the power supply to the non-effective power receiving equipment and the damage to the equipment can be avoided.
Referring to fig. 6, which is a schematic structural diagram of a power supply device according to an embodiment of the present invention, the power supply device 60 includes a processor 601, a memory 602, a power supply circuit 603, a PSE chip 604, and an ethernet port 605, and is configured to implement the power over ethernet method shown in fig. 1 according to the present invention.
The power supply circuit 603 is connected to the ethernet port 605. The power supply circuit 603 is connected to the PSE chip 604. Specifically, the PSE chip 604, the power supply circuit 603 and the ethernet port are connected through a switch circuit. The embodiment of the invention is described by taking an example that the switch circuit is a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET for short), as shown in fig. 6.
The processor 601, the memory 602 and the ethernet port 605 are connected via a bus 606 (shown in fig. 6 by a thick line). The bus 606 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus.
The processor 601 and the PSE chip 604 are connected by an Inter-Integrated Circuit (IIC) bus.
The PSE chip is a chip designed to satisfy PSE functionality in PoE protocol requirements.
The powered device 70 is connected to the power sourcing equipment 60 through the ethernet port 605, and the powered device 70 and the power sourcing equipment 60 form a power over ethernet system.
The power supply device in the embodiment of the invention can be a switch or a router supporting PoE. The power sourcing equipment may include one or more ethernet ports 605.
The processor 601 may be a Central Processing Unit (CPU) or a Network Processor (NP).
The memory 602 may be a volatile memory (english). The memory 602 may also be a non-volatile memory (english: non-volatile memory), such as a flash memory (english: flash memory), a hard disk (english: hard disk drive, abbreviated as HDD) or a solid-state drive (english: SSD).
In the case where the processor 601 is a CPU, the memory 602 is also used to store program instructions, and the memory 602 is a non-volatile memory. The processor 601 performs the following operations according to program instructions stored in the memory 602. In the case where the processor 601 is an NP, the processor 601 performs the following operations.
The processor 601 obtains power supply information of the ethernet port 605 from the memory 602, where the power supply information includes a powered device status; specifically, in the case that the power sourcing equipment 60 is ready to supply power to the ethernet port 605, the processor 601 first obtains the power supply information of the ethernet port 605 in the memory 602 to confirm whether the powered device status of the ethernet port 605 is valid.
If the powered device state of the ethernet port 605 is invalid, it may be considered that the powered device 70 is first accessed to the power supply device 60 through the ethernet port 605, the processor 601 instructs the PSE chip 604 to detect the powered device 70, and when it is determined that the powered device 70 is a valid powered device, the processor 601 sets the powered device state of the ethernet port 605 in the memory 602 to be valid, and instructs the power supply circuit 603 to power on the powered device 70, so that the powered device 70 is started to enter a working state.
The processor 601 instructs the PSE chip 604 to detect the powered device 70 to determine whether the PD is a valid powered device specifically includes: the processor 601 writes a register in the PSE chip via the IIC bus, and instructs the PSE chip 604 to perform power-on detection on the ethernet port 605 to determine whether the powered device 70 is a valid powered device. The power-on detection means that a PSE chip inputs two detection voltages with different voltage amplitudes, for example, detection voltages with any two different voltage amplitudes between 2.8V and 10V, to an ethernet port to be detected at a certain time interval (which can be set as required, for example, 100 ms), and determines the resistance of the powered device to be detected according to the ratio of the detected voltage to the detected current, and according to the standard, the effective powered device has a characteristic resistance between 19 kiloohm (english: kilohm, symbol: k Ω) and 26.5k Ω; therefore, if the resistance of the to-be-detected powered device is detected to be between 19k Ω and 26.5k Ω, the to-be-detected powered device can be determined to be a valid powered device; if the resistance of the to-be-detected powered device is detected to be less than 15k Ω or greater than 33k Ω, the to-be-detected powered device can be determined to be an invalid powered device.
In fig. 6, "V" denotes a voltage measuring terminal, and "I" denotes a current measuring terminal.
If the powered device status of the ethernet port 605 is valid, the processor 601 instructs the power supply circuit 603 to directly power up the powered device 70. Specifically, if the powered device status of the ethernet port 605 is valid, it may be considered that the powered device 70 is not first connected to the power sourcing equipment 60, and the power sourcing equipment 60 directly powers on the powered device 70, so as to implement fast power-on start of the powered device 70. The power supply device 60 directly powers on the powered device 70, which means that the power supply device 60 skips a power-on detection stage to power on the powered device 70.
The processor 601 instructs the power supply circuit 603 to power on the powered device 70, which specifically includes: the processor 601 writes a register in the PSE chip 604 through the IIC bus, for example, writes a power-on enable register to 1 or 0, and instructs the PSE chip 604 to output a high level or a low level to turn on or off the MOS transistor, thereby controlling the power supply circuit 603 to supply or stop supplying power to the powered device, such as-48 v power supply voltage shown in fig. 6.
Further, after the processor 601 detects the powered device 70 and determines that the powered device is a valid powered device, and before the power supply circuit 603 is instructed to power on the powered device 70, the processor 601 may obtain classification information of the powered device 70 by measuring a classification current through Physical Layer classification (english: Physical Layer classification), that is, adding a classification voltage to the ethernet port; and stores the acquired classification information of the powered device 70 in the power supply information of the ethernet port 605. Or, alternatively, after the processor 601 instructs the power supply circuit 603 to supply power to the powered device 70, the processor 601 obtains the classification information of the powered device 70 by link layer classification, that is, after the data link between the power supply device 60 and the powered device 70 is established, the processor 601 communicates with the powered device 70 by using a data link layer protocol, for example, LLDP, and stores the obtained classification information of the powered device 70 in the power supply information of the ethernet port 605 in the memory 602. The power supply information further includes rating information.
Further, after the power receiving apparatus 70 is powered on, if the power supply information of the ethernet port does not include the classification information of the power receiving apparatus 70, or whether the power supply information of the ethernet port includes the classification information of the power receiving apparatus 70 or not, the processor 601 may acquire the classification information of the power receiving apparatus 70 through link layer classification, and save/update the acquired classification information of the power receiving apparatus 70 in the power supply information of the ethernet port 605 in the memory 602.
The first time the powered device 70 accesses the power sourcing equipment 60 through the ethernet port 605 may be as follows:
first, the powered device 70 is a historical first powered device that is connected to the power sourcing equipment 60 through the ethernet port;
second, the physical connection of the Ethernet port was broken; in this case, the powered device 70 may still be a powered device that is connected to the power sourcing equipment 60 through the ethernet port before the physical connection is broken, for example, a plug (plug) action occurs in the powered device 70, which results in the physical connection of the ethernet port being broken. It is also possible that the PD is not the same device as the powered device that was connected to the power sourcing equipment 60 through the ethernet port before the physical connection was broken, and the powered device 70 is newly connected to the powered device of the power sourcing equipment 60 through the ethernet port.
The memory 602 is also used for storing power supply information of the ethernet port 605. The memory 602 may store the correspondence between the ethernet port and the power supply information. In a specific implementation, the powered device status of the ethernet port may include an invalid status and a valid status; in an initial state, the powered device states of the Ethernet ports of the PSE are all set to be invalid by default. Of course, in a specific implementation, the powered device status of the ethernet port may include other statuses besides invalid and valid, such as null; in the initial state, the powered device status of the ethernet port may be null or invalid. In the embodiment of the invention, the conditions that the states of the power receiving equipment of the Ethernet port are not valid can be considered as invalid; if the powered device status of the ethernet port is empty, the process may be performed in the same manner as if the powered device status of the ethernet port is invalid. The invention is not limited in this regard.
The power supply device 60 may store the correspondence between the ethernet port and the power supply information in the memory by using a correspondence table. The correspondence table may include an identifier of the ethernet port and power supply information, where the identifier of the ethernet port may be a port number or a port address, and the power supply information includes a powered device state, classification information, and the like, as shown in table 1.
Further, the processor 601 may set a power supply current upper limit threshold of the power receiving apparatus 70 according to the obtained classification information of the power receiving apparatus 70. The processor 601 may also sense (english: sense) the power supply current on the ethernet port in real time, and if the power supply current exceeds the set upper threshold of the power supply current of the powered device 70, the processor may process according to a preset power supply policy, where the preset power supply policy includes stopping power supply, sending an alarm (for example, a speaker sends an alarm in the form of a sound, or an indicator light or a display sends an alarm in the form of a light, or sends an alarm in the form of a short message according to a preset mobile phone number, or sends an alarm in the form of an email according to a preset email address, etc.), recording a log, and the like.
Further, after powering the powered device 70, the processor 601 monitors the physical connection of the ethernet port. Specifically, the processor 601 continuously (including during the power supply to the powered device 70 and after the power supply to the powered device 70 is stopped) monitors whether the physical connection of the ethernet port is disconnected. In this way, the power sourcing equipment 60 can ensure real-time update of the powered device status of the ethernet port, and improve validity and reliability of the powered device status of the ethernet port.
If the physical disconnection of the ethernet port is monitored, the processor 601 preferably sets the powered device status of the ethernet port 605 in the memory 602 to invalid; optionally, the processor 601 may also clear the powered device status of the ethernet port in the memory 602.
If the physical connection of the Ethernet port is not broken, the power sourcing equipment 60 can continue to supply power or stop supplying power to the powered device 70. When the power supply apparatus 60 stops supplying power to the powered apparatus, the power supply apparatus 60 maintains the powered apparatus state of the ethernet port stored in the memory 602 unchanged.
In this way, the power sourcing equipment 60 can update the powered device status of the ethernet port in real time, and the effectiveness and reliability of the powered device status of the ethernet port are improved.
In the process of supplying power to the powered device 70, the processor 601 may measure a current value of the ethernet port 605 through the PSE chip 604, and determine whether the physical connection of the ethernet port is disconnected according to whether the current value is continuously smaller than a preset threshold and exceeds a preset time threshold.
In this embodiment of the present invention, after stopping supplying power to the powered device 70, the processor 601 may monitor whether the physical connection of the ethernet port 605 is disconnected through two methods, which are specifically as follows:
first, the processor 601 instructs the PSE chip 604 to continuously perform power-on detection on the powered device 70, and detects whether the powered device 70 is an effective resistor specified by a standard, for example, 25 kilo-ohms (k Ω), to determine whether the powered device is disconnected. If the effective resistance is not specified by the standard, the powered device is judged to be disconnected, and the physical connection of the Ethernet port can be considered to be disconnected; if the effective resistance specified by the standard is detected, it is determined that the powered device is not disconnected, i.e. remains connected to the ethernet port, and the physical connection of the ethernet port may be considered not to be disconnected. Specifically, the power-on detection process is as described above.
The power supply device 60 further includes a monitoring circuit, and the monitoring circuit 606 is configured to monitor whether the physical connection of the ethernet port is disconnected. The monitoring circuit is not limited in the present invention as long as the object of the present invention can be achieved.
In the power supply device provided in the embodiment of the present invention, the processor determines, according to the state of the powered device at the ethernet port, whether the powered device accessed through the ethernet port is accessed to the power supply device for the first time, and if not, instructs the power supply circuit to directly power on the powered device, so as to implement fast powering on and starting of the powered device; if the power receiving equipment is accessed for the first time, the PSE chip is instructed to detect the power receiving equipment and then power on, so that the reliability of Ethernet power supply is improved, and the power supply to the non-effective power receiving equipment and the damage to the equipment can be avoided.
It will be understood by those skilled in the art that all or part of the steps in the above method embodiments may be implemented by hardware that is instructed by a program, and the corresponding program may be stored in a computer-readable storage medium, where the storage medium may be a random access memory, a read only memory, a flash memory, a hard disk, a solid state disk, or an optical disk.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (11)
1. A method of power over ethernet, comprising:
the power supply equipment acquires power supply information of an Ethernet port of the power supply equipment, wherein the power supply information comprises a powered equipment state, and the powered equipment state comprises invalidity and validity;
if the powered device state of the Ethernet port is invalid, the power supply device detects the powered device connected with the power supply device through the Ethernet port, and when the powered device is confirmed to be valid, the power supply device sets the powered device state of the Ethernet port to be valid and powers on the powered device;
if the powered device state of the Ethernet port is valid, the power supply device directly powers on the powered device; the power supply equipment directly powers on the powered equipment, namely the power supply equipment skips power-on detection to power on the powered equipment;
after the powered device is powered on, the power supply device monitors the physical connection of the Ethernet port, and if the physical connection of the Ethernet port is monitored to be disconnected, the power supply device sets the state of the powered device of the Ethernet port to be invalid.
2. The method of claim 1, wherein the power sourcing equipment monitoring the physical connection of the ethernet port comprises:
after the power supply device stops supplying power to the powered device, the power supply device continuously detects whether the powered device connected to the Ethernet port is valid or not so as to judge whether the physical connection of the Ethernet port is disconnected or not.
3. The method according to claim 1 or 2, wherein when the powered device status of the ethernet port is invalid, after the power sourcing equipment detects the powered device, confirms that the powered device is a valid powered device, and before the power sourcing equipment powers on the powered device, the method further comprises:
the power supply equipment acquires the classification information of the powered equipment through physical layer classification;
and storing the acquired classification information of the powered device into power supply information of the Ethernet port, wherein the power supply information further comprises classification information.
4. The method according to claim 1 or 2, wherein after the power sourcing equipment powers up the powered device, the method further comprises:
the power supply equipment acquires the classification information of the powered equipment through link layer classification;
and storing the acquired classification information of the powered device into power supply information of the Ethernet port, wherein the power supply information further comprises classification information.
5. The power supply equipment is characterized by comprising an acquisition module, a detection module, a setting module and a power supply module;
the obtaining module is configured to obtain power supply information of an ethernet port of the power supply device, where the power supply information includes a powered device state, and the powered device state includes invalid and valid;
the detection module is configured to detect, when the powered device state of the ethernet port is invalid, a powered device connected to the power sourcing equipment through the ethernet port, so as to determine whether the powered device is a valid powered device;
the setting module is configured to set a powered device state of the ethernet port to be valid when the detection module determines that the powered device is a valid powered device;
the power supply module is used for directly powering on the powered device of the Ethernet port under the condition that the state of the powered device is effective; the direct power-on of the powered device means that the power supply device skips power-on detection to power on the powered device;
the power supply equipment further comprises a monitoring module;
the monitoring module is used for monitoring the physical connection of the Ethernet port;
the setting module is further configured to set a state of a powered device of the ethernet port to be invalid when the monitoring module monitors that the physical connection of the ethernet port is disconnected.
6. The power supply device according to claim 5, further comprising a physical layer classification module and a storage module;
the physical layer classification module is configured to, when the powered device status of the ethernet port is invalid, obtain classification information of the powered device through physical layer classification after the detection module determines that the powered device is a valid powered device and before the power supply module powers on the powered device;
the storage module is configured to store the classification information of the powered device, which is obtained by the classification module, in power supply information of the ethernet port, where the power supply information further includes classification information.
7. The power supply apparatus according to claim 5 or 6, further comprising a data link layer classification module and a storage module;
the data link layer classification module is configured to obtain classification information of the powered device through data link layer classification after the power supply device powers on the powered device;
the storage module is configured to store the classification information of the powered device, which is obtained by the data link layer classification module, in power supply information of the ethernet port, where the power supply information further includes classification information.
8. The power supply equipment is characterized by comprising a processor, a memory, an Ethernet port, a power supply circuit and a power supply equipment PSE chip;
the power supply circuit is connected with the Ethernet port;
the power supply circuit is connected with the PSE chip;
the processor is connected with the PSE chip;
the processor is connected with the memory;
the power receiving equipment is connected with the power supply equipment through the Ethernet port;
the processor acquires power supply information of an Ethernet port of the power supply equipment from the memory, wherein the power supply information comprises a powered equipment state, and the powered equipment state comprises invalid and valid;
when the powered device state of the Ethernet port is invalid, the processor instructs the PSE chip to detect the powered device, and when the powered device is determined to be a valid powered device, the processor sets the powered device state of the Ethernet port in the memory to be valid and instructs the power supply circuit to power on the powered device;
when the state of the power receiving equipment of the Ethernet port is valid, the processor instructs the power supply circuit to directly power on the power receiving equipment, wherein the direct power on of the power receiving equipment means that the power supply equipment skips power on detection to power on the power receiving equipment;
the processor monitors the physical connection of the Ethernet port; and if the physical connection disconnection of the Ethernet port is monitored, the processor sets the state of the powered device of the Ethernet port in the memory to be invalid.
9. The power sourcing equipment of claim 8, wherein, in the event that the powered device status of the Ethernet port is invalid,
the processor is at the instruction the detection circuitry is right the powered device detects, confirms that the powered device is effectual powered device after, and at the instruction the power supply circuit is right before the powered device is powered on, acquires through the physical layer classification the hierarchical information of powered device, and will acquire the hierarchical information of powered device is saved in the memory in the power supply information of ethernet port, the power supply information still includes hierarchical information.
10. The power supply apparatus according to claim 8 or 9,
after the power supply circuit powers on the powered device, the processor acquires the classification information of the powered device through link layer classification, and stores the acquired classification information of the powered device into the power supply information of the ethernet port in the memory, wherein the power supply information further includes classification information.
11. A power over ethernet system comprising a power sourcing equipment according to any of claims 5 to 10 and a powered device, said powered device being connected to said power sourcing equipment via an ethernet port of said power sourcing equipment.
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| CN201410124490.6A CN104954145B (en) | 2014-03-29 | 2014-03-29 | Ethernet power supply method, power supply equipment and Ethernet power supply system |
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| RU2716567C2 (en) * | 2015-02-04 | 2020-03-12 | Филипс Лайтинг Холдинг Б.В. | Powered device, power sourcing equipment device, power-over-ethernet network system and methods therefor |
| CN113595745A (en) | 2016-10-13 | 2021-11-02 | 华为技术有限公司 | Power supply equipment, Ethernet power supply method and device |
| CN107566130A (en) * | 2017-08-07 | 2018-01-09 | 福州市协成智慧科技有限公司 | Ethernet is by electric AP equipment, POE AP equipment and group network system |
| CN109428726B (en) * | 2017-08-28 | 2022-07-26 | 华为技术有限公司 | Port adaptive method and device |
| CN107612854A (en) * | 2017-10-18 | 2018-01-19 | 湖南恒茂高科股份有限公司 | A kind of non-management type PoE interchangers and control method |
| CN109698755B (en) * | 2017-10-23 | 2021-12-14 | 华为技术有限公司 | Power supply control method, power supply device and power receiving device |
| CN108964927B (en) * | 2018-06-08 | 2021-04-27 | 新华三技术有限公司 | Power over Ethernet (PoE) self-adaption method and device |
| CN109150551B (en) * | 2018-08-29 | 2021-08-20 | 普联技术有限公司 | Non-standard POE power supply circuit, power supply equipment and power supply method for network port |
| CN111175589A (en) * | 2018-11-12 | 2020-05-19 | 华为技术有限公司 | Communication equipment and validity detection method |
| CN111181737B (en) * | 2018-11-12 | 2021-09-14 | 华为技术有限公司 | Control method, power receiving device and system |
| CN110061890B (en) * | 2019-04-16 | 2021-04-27 | 维沃移动通信有限公司 | Data transmission control circuit, terminal device and data transmission line |
| CN113660101B (en) * | 2020-05-12 | 2022-10-18 | 华为技术有限公司 | Port matching method, power-on method, equipment and system |
| CN113030556B (en) * | 2021-02-08 | 2022-11-11 | 山东捷讯通信技术有限公司 | Ethernet current measuring circuit and Ethernet terminal system |
| CN115695060B (en) * | 2022-12-28 | 2023-03-21 | 苏州浪潮智能科技有限公司 | Power-off protection method, device, equipment and storage medium |
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| CN101371492B (en) * | 2006-01-17 | 2012-08-15 | 美国博通公司 | Power over Ethernet controller and method for detecting and classifying power supply equipment |
| US7814342B2 (en) * | 2006-10-18 | 2010-10-12 | Broadom Corporation | System and method for communication using an AC signal from a powered device |
| CN101977115B (en) * | 2010-09-07 | 2014-01-01 | 中兴通讯股份有限公司 | Method and device for realizing power control over Ethernet |
| CN102123034B (en) * | 2011-02-28 | 2015-08-26 | 中兴通讯股份有限公司 | POE system is utilized to carry out method and the device of high-low pressure selection power supply |
| CN102387022B (en) * | 2011-10-20 | 2016-08-31 | 华为技术有限公司 | A kind of POE method and apparatus |
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