CN105721225A - Circuit and method for detecting state of far-end network device - Google Patents
Circuit and method for detecting state of far-end network device Download PDFInfo
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- CN105721225A CN105721225A CN201610211380.2A CN201610211380A CN105721225A CN 105721225 A CN105721225 A CN 105721225A CN 201610211380 A CN201610211380 A CN 201610211380A CN 105721225 A CN105721225 A CN 105721225A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/50—Testing arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0631—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Environmental & Geological Engineering (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention discloses a circuit and method for detecting a state of a far-end network device. The circuit comprises a network PHY circuit, a network interface, a control circuit, a digital-to-analogue conversion circuit, a double-pole double-throw switch, an analog-to-digital conversion circuit and a sensing unit. According to the circuit and the method, the double-pole and double-throw switch is added between the network interface and the network PHY circuit; the switch-on and switch-off of the double-pole and double-throw switch are controlled by the control circuit according to the detection result of the state of the far-end network device, thus controlling switching of a main signal access and a channel management circuit; and the connection detection of a far-end network device and the detection of whether the far-end network device is in a communication state are realized.
Description
Technical field
The present invention relates to a kind of circuit detecting network device state and method thereof, particularly relate to a kind of circuit detecting remote network devices state and method thereof.
Background technology
Along with the arrival of Internet of Things, a lot of equipment have all possessed the ability of data communication, but a lot of in actual use equipment is all without working on power, and causes the significant wastage of electric power resource.
At present, the conventional network port is designed as after the chip of corresponding PHY (physical layer) is connected to RJ45 by network transformer isolation to be connected to other network interface remote network devices by netting twine, as shown in Figure 1, U1 is local device PHY (physical layer) chip, T1 is network transformer, J1 is generally RJ45 network interface, the differential received end RX+/RX-of PHY chip U1 connects 1/3 foot of network transformer respectively, the differential transmission end TX+/TX-of PHY chip U1 connects 4/6 foot of network transformer respectively, differential received end RX+/RX-connects 1/2 foot of network interface J1 respectively after network transformer T1 from common mode inhibition end 12/11, differential transmission end TX+/TX-connects 4/7 foot of network interface J1 respectively after network transformer T1 from common mode inhibition end 9/7.
The design of the above-mentioned network port has the drawback that the network port of existing local device can not detect the port of communication and whether have whether carry remote network devices or current remote network devices exist data communication, causes the significant wastage of resource.
Summary of the invention
For the deficiency overcoming above-mentioned prior art to exist, the purpose of the present invention is in that to provide a kind of circuit detecting remote network devices state and method thereof, primary signal pathways and management circuit switching is controlled by increasing an analog switch between network and transformator, when working properly, switch module set is on the main circuit, product normal operation realizes normal data communication, it is possible to achieve whether the connection detection of remote network devices and remote network devices are in the detection of communications status.
For reaching above-mentioned purpose, the present invention proposes a kind of circuit detecting remote network devices state, and including network PHY circuit and network interface, the circuit of this detection remote network devices state also includes:
D/A converting circuit, is used for the instruction receiving control circuit to produce potential pulse；
Analog to digital conversion circuit, the potential pulse through the decay of network line, network interface and remote network devices exported by this D/A converting circuit is converted to digital signal and reaches control circuit；
Double-point double-throw switch, selects to connect this network PHY circuit or this D/A converting circuit and analog to digital conversion circuit according to the control signal of control circuit；
Detecting unit, connects the common port of control circuit and this double-point double-throw switch, to detect the signal on network line under the control of this control circuit and to feed back to control circuit；
Control circuit, output according to this analog to digital conversion circuit determines whether to connect remote network devices, according to determining that output control sends link pulse signal by this network interface, switching on and off of this double-point double-throw switch is controlled, to realize primary signal pathways and the switching control of channel management circuit according to the signal that this detecting unit detects.
Further, under the control of this control circuit, the outfan of this double-point double-throw switch is connected to the receiving terminal of the network transformer of this network PHY circuit or connects the outfan of this D/A converting circuit and the in-phase input end of this analog to digital conversion circuit.
Further, a resistance is connected between the in-phase input end of this analog to digital conversion circuit and inverting input.
Further, first this control circuit controls this double-point double-throw switch and connects this analog to digital conversion circuit and D/A converting circuit, and after local device electrification reset, this control circuit control this D/A converting circuit and send this potential pulse in specific time slot to detect whether to there is remote network devices.
Further, this control circuit obtains the ohmically pressure drop of this analog to digital conversion circuit when this D/A converting circuit sends detection potential pulse, by calculating the electric current obtained on network line, judge whether remote network devices according to the comparative result of this current value and a preset value.
Further, if connection remote network devices detected, this control circuit sends a link pulse signal at set intervals by network interface, and detected the signal on this network line by this detecting unit, when the link pulse signal that the signal detected is remote network devices, this control circuit sends the switch-over control signal of this double-point double-throw switch, controls this double-point double-throw switch and connects this network PHY circuit.
Further, if detecting when far-end does not detect the link pulse signal of remote network devices without connection equipment or this detecting unit, this control circuit sends the energy-conservation signal of local device so that local device corresponding ports is operated under the pattern of low power consumption.
Further, the amplitude of this potential pulse depends on the resolution of line length and this analog to digital conversion circuit and the maximum input voltage of remote network devices.
For reaching above-mentioned purpose, the present invention also provides for a kind of method detecting remote network devices state, comprises the steps:
Step one, D/A converting circuit produces potential pulse under the control of control circuit；
Step 2, control circuit obtains the output of analog to digital conversion circuit to determine whether to connect remote network devices, and according to determining that output control sends link pulse signal by this network interface；
Step 3, utilizes the signal on detecting unit detection network line and feeds back to control circuit；
Step 4, control circuit controls switching on and off of this double-point double-throw switch according to the signal that this detecting unit detects
Further, in step 4, if detecting unit detects the link pulse signal of remote network devices, this control circuit controls this double-point double-throw switch and switches to main signal path；If detecting unit is not detected by the link pulse signal of remote network devices, this control circuit controls this double-point double-throw switch and switches to channel management circuit.
Compared with prior art, a kind of circuit detecting remote network devices state of the present invention and method thereof by increasing double-pole double-throw switch between network interface and network PHY circuit, and control switching on and off of this double-point double-throw switch by control circuit according to the testing result of the state to remote network devices, to control primary signal pathways and channel management circuit switching, achieve remote network devices connect detection and whether remote network devices is in the detection of communications status, can when remote network devices disconnects, local device corresponding ports is made to be operated under the pattern of low power consumption, reduce the power consumption of circuit.
Accompanying drawing explanation
Fig. 1 is conventional network port connection diagram；
Fig. 2 is the circuit structure diagram of the preferred embodiment of a kind of circuit detecting remote network devices state of the present invention；
Fig. 3 is the flow chart of steps of a kind of method detecting remote network devices state of the present invention.
Detailed description of the invention
Below by way of specific instantiation accompanying drawings embodiments of the present invention, those skilled in the art can be understood further advantage and effect of the present invention easily by content disclosed in the present specification.The present invention also can pass through other different instantiation and be implemented or apply, and the every details in this specification also based on different viewpoints and application, can carry out various modification and change under the spirit without departing substantially from the present invention.
Fig. 2 is the circuit structure diagram of the preferred embodiment of a kind of circuit detecting remote network devices state of the present invention.As in figure 2 it is shown, a kind of circuit detecting remote network devices state of the present invention includes digital-to-analogue conversion (D/A) circuit 10, double-point double-throw switch 20, analog digital conversion (A/D) circuit 30, detecting unit 40, control circuit 50, network PHY circuit 60 and network interface J1.
Wherein network PHY circuit 60 and network interface J1 (being generally RJ45 interface) are the original circuit of local device, do not repeat them here；Digital-to-analogue conversion (D/A) circuit 10, for receiving the instruction potential pulse by particular time-slot generation certain amplitude of control circuit 50, the amplitude of this potential pulse depends on resolution and the maximum input voltage of line length and analog digital conversion (A/D) circuit 30, it is advantageous to desirable 3-10V；Double-point double-throw switch 20 can be controllable simulation switch or a high speed digital switches, selects to connect network PHY circuit 60 or analog digital conversion (A/D) circuit 30 and D/A converting circuit 10 for the control signal according to control circuit 50；Analog digital conversion (A/D) circuit 30, its input port connects a specific electrical resistance, this resistance value depends on the amplitude of the pulse voltage of line length and the output of digital-to-analogue conversion (D/A) circuit 30, the pulse voltage decayed for the network transformer through network line (such as netting twine), network interface (such as RJ45 interface) and remote network devices exported by digital-to-analogue conversion (D/A) circuit 20 is converted to digital signal, and transmits the result to control circuit 50；Detecting unit 40, for detecting the state on network line and feeding back to control circuit under the control of control circuit 50；Control circuit 50, potential pulse is sent for controlling D/A converting circuit 10, output according to analog to digital conversion circuit 30 determines whether to connect remote network devices, and according to determining that output control sends link pulse signal by this network interface, signal according to detecting unit 40 detection controls switching on and off of this double-point double-throw switch 20, to realize primary signal pathways and the switching control of channel management circuit, in the present invention, namely this primary signal pathways provides network PHY circuit 60 to pass through the signal path that network interface communicates with remote network devices by double-point double-throw switch 20, namely channel management circuit connects the path of D/A converting circuit and analog to digital conversion circuit by double-point double-throw switch 20, in the present invention, control circuit 50 can be special IC (ASIC), programmable array or MCU.
Specifically, one end (general input/output port GPIO3/4) of control circuit 50 is connected to a road port (1/2 end of U2) of detecting unit 50, another road port (3/4 end of U2) of detecting unit 40 is connected to two common ports (4/3 foot of SW1) of network interface J1 receiving terminal (2/1 foot) and double-point double-throw switch 20, No. one outfan (2/1 foot of SW1) of double-point double-throw switch 20 is connected to the receiving terminal (10/12 foot of T1, end of oppisite phase RX1-/in-phase end RX1+) of the network transformer of network PHY circuit 60；One tunnel output (general input/output port GPIO2) of control circuit 50 is connected to the input of digital-to-analogue conversion (D/A) circuit 10, one of the outfan of digital-to-analogue conversion (D/A) circuit 10 another road output (output of two, every road) being connected to double-point double-throw switch 20 (6 feet of SW1), two (5 feet of SW1) on another road output (output of two, every road) of double-point double-throw switch 20 are connected to in-phase input end (2 feet of U3 of analog digital conversion (A/D) circuit 10, in-phase input end A+), resistance R1 is connected in in-phase input end and inverting input (1 foot of U3 of analog digital conversion (A/D) circuit 30 in parallel, inverting input A-, it is generally ground) between, outfan (3 feet of U3 of analog digital conversion (A/D) circuit 30, digital output end D) it is connected to the input (general input/output port GPIO1) of control circuit 50；3rd outfan (not shown) of control circuit 50 is additionally coupled to the control end (not shown) of double-point double-throw switch 20.
When after local device electrification reset, control circuit 50 controls D/A converting circuit 10 and sends potential pulse in specific time slot to detect whether to there is remote network devices, when detecting that local port has connection remote network devices, control circuit 50 sends a link pulse signal by network interface (such as 16ms) at set intervals, if there is the remote network devices powered on, then local device and remote network devices can set up data link according to procotol, after data are set up and are connected, control circuit 50 controls double-point double-throw switch 20 and connects local network PHY circuit 60 and remote network devices through RJ45 interface (network interface), that is, local network PHY circuit 60 and remote network devices there will be continuous print data signal after setting up data link in the data of primary signal pathways (1/2 foot of network interface RJ45), the present invention detects the state on network line (whether having the link pulse signal that remote network devices responds) by the chip U2 of detecting unit 40, when the link pulse signal that the signal that detecting unit 40 detects is far-end PHY chip, feed back to control circuit 50, the switch-over control signal of double-point double-throw switch is sent by control circuit 50 (U5), the port 1/2 of RJ45 network interface J1 is connected to local network PHY circuit by double-point double-throw switch 20, it is switched to main signal path by circuit, it should be noted that at this, now control circuit 50 still can continue through the state on the chip U2 sense channel line of detecting unit 40, to determine the connection status of remote network devices.
In the specific embodiment of the invention, the control chip U5 of control unit 50 has following three kinds of states:
1, network service normal condition, namely local device realizes communicating normally with remote network devices, and now circuit is in primary signal pathways.In this condition, the signal condition of the chip U2 sense channel always of detecting unit, if primary signal pathways has continuous print differential signal waveform (link pulse signal of remote network devices response) always, the control chip U5 of control circuit is set in network service normal operating conditions, now controls the connection (primary signal pathways) that double-point double-throw switch keeps the port 1/2 of local network PHY circuit and RJ45 network interface J1.
2. non-powered devices detection state, when local device has remote network devices to connect, when but remote network devices does not power on, first double-point double-throw switch is placed in the channel management circuit that connects through D/A converting circuit and analog to digital conversion circuit and control chip U5 by control circuit, and (double-point double-throw switch common port 4 is connected to port 5, common port 3 is connected to port 6, 2 feet of U5 are through D/A converting circuit, double-point double-throw switch connects analog to digital conversion circuit) on, the chip U5 of control circuit makes the chip U4 of D/A converting circuit send a detection potential pulse of 10V by interface instruction in specific time slot, the impedance of the netting twine of 100M conventional on market is usually no more than 50 ohm, because the terminal of the receiving terminal of networking products connects such as Fig. 1, it is connected by a network transformer between signal pins 1 and the foot 2 of networking products RJ45, control circuit obtains the pressure drop of resistance R1 when local device end sends detection potential pulse, by calculating the electric current that can obtain on grid line, if the electric current obtained is higher than a preset value (in the specific embodiment of the invention, the theoretical minimum value of this preset value is 100mA), then judge and remote network devices has connection, after judging that remote network devices is not turned off, control circuit then controls detecting unit and holding wire does link pulse signal detection, illustrate that when the link pulse signal of remote network devices being detected remote network devices has been powered normally, the chip U5 of control circuit by double-point double-throw switch setting in primary signal pathways, namely network service normal condition is entered.
3. being not connected with remote network devices state, remote network devices connects disconnection.If the electric current that the chip U5 of control circuit obtains after sending detection potential pulse is lower than 100mA, then judge that far-end is absent from equipment, this time can be sent warning signal prompting user's remote network devices by local device and be disconnected, illustrating that remote network devices is lost or link is abnormal, the chip U5 of control circuit sends under the pattern that the energy-conservation signal of local device is operated in low power consumption by local device corresponding ports simultaneously.
Fig. 3 is the flow chart of steps of a kind of method detecting remote network devices state of the present invention.As it is shown on figure 3, a kind of method detecting remote network devices state of the present invention, comprise the steps:
Step 301, D/A converting circuit produces potential pulse under the control of control circuit.In the present invention, first controlled double-point double-throw switch by control circuit and be placed in channel management circuit, and after local device electrification reset, this control circuit control D/A converting circuit and send detection potential pulse in specific time slot to detect whether to there is remote network devices.In the present invention, on the local device after reset, control circuit makes D/A converting circuit send a detection potential pulse of 10V by interface instruction in specific time slot.
Step 302, control circuit obtains the output of analog to digital conversion circuit to determine whether to connect remote network devices, and according to determining that output control sends link pulse signal by this network interface.Specifically, control circuit obtains the pressure drop of analog to digital conversion circuit resistance R1 when D/A converting circuit sends detection potential pulse, by calculating the electric current obtained on grid line, if the electric current obtained is higher than a preset value (in the specific embodiment of the invention, the theoretical minimum value of this preset value is 100mA), then judge and remote network devices has connection, if the electric current obtained is less than this preset value, then judge that far-end is absent from equipment.If detecting, when local port has connection remote network devices, by control circuit, (such as 16ms) sends a link pulse signal by network interface at set intervals.Specifically, if there is the remote network devices powered in port, then local device and remote network devices can set up data link according to procotol, then local network PHY circuit and remote network devices there will be continuous print data signal (being generally differential signal waveform) on primary signal pathways after setting up data link.
Step 303, utilizes the signal on detecting unit detection network line and feeds back to control circuit, specifically, detecting unit detecting the state on network line, to detect whether the remote network devices link pulse signal to local device has response.
Step 304, control circuit controls switching on and off of this double-point double-throw switch according to the signal that this detecting unit detects.Specifically, (represent that remote network devices and local device exist data communication) when the link pulse signal that the signal that detecting unit detects is remote network devices (PHY chip), the switch-over control signal of double-point double-throw switch is then sent by control circuit, current circuit is switched to primary signal pathways, namely the connection of the port of local network PHY circuit and RJ45 network interface J1 is kept, and when detecting unit is not detected by the link pulse signal of remote network devices, this control circuit controls this double-point double-throw switch and switches to channel management circuit.
Preferably, if detecting when far-end is absent from data communication without connection equipment or remote network devices, utilize local device to send alarm signal prompting user's remote network devices to be disconnected, illustrate that remote network devices is lost or link is abnormal, sent the energy-conservation signal of local device by control circuit so that local device corresponding ports is operated under the pattern of low power consumption simultaneously.
In sum, a kind of circuit detecting remote network devices state of the present invention and method thereof by increasing double-pole double-throw switch between network interface and network PHY circuit, and control switching on and off of this double-point double-throw switch by control circuit according to the testing result of the state to remote network devices, to control primary signal pathways and channel management circuit switching, achieve remote network devices connect detection and whether remote network devices is in the detection of communications status, can when remote network devices disconnects, local device corresponding ports is made to be operated under the pattern of low power consumption, reduce the power consumption of circuit.
Above-described embodiment all under the spirit and category of the present invention, can carried out modifying and change by any those skilled in the art.Therefore, the scope of the present invention, should as listed by claims.
Claims (10)
1. detect a circuit for remote network devices state, including network PHY circuit and network interface, it is characterised in that the circuit of this detection remote network devices state also includes:
D/A converting circuit, is used for the instruction receiving control circuit to produce potential pulse；
Analog to digital conversion circuit, the potential pulse through the decay of network line, network interface and remote network devices exported by this D/A converting circuit is converted to digital signal and reaches control circuit；
Double-point double-throw switch, selects to connect this network PHY circuit or this D/A converting circuit and analog to digital conversion circuit according to the control signal of control circuit；
Detecting unit, connects the common port of control circuit and this double-point double-throw switch, to detect the signal on network line under the control of this control circuit and to feed back to control circuit；
Control circuit, output according to this analog to digital conversion circuit determines whether to connect remote network devices, according to determining that output control sends link pulse signal by this network interface, the signal detected according to this detecting unit controls the switching of this double-point double-throw switch, to realize primary signal pathways and the switching control of channel management circuit.
2. a kind of circuit detecting remote network devices state as claimed in claim 1, it is characterized in that: under the control of this control circuit, the outfan of this double-point double-throw switch is connected to the receiving terminal of the network transformer of this network PHY circuit or connects the outfan of this D/A converting circuit and the in-phase input end of this analog to digital conversion circuit.
3. a kind of circuit detecting remote network devices state as claimed in claim 2, it is characterised in that: a resistance is connected between the in-phase input end of this analog to digital conversion circuit and inverting input.
4. a kind of circuit detecting remote network devices state as claimed in claim 3, it is characterized in that: first this control circuit controls this double-point double-throw switch and connect this analog to digital conversion circuit and D/A converting circuit, and after local device electrification reset, this control circuit control this D/A converting circuit and send this potential pulse in specific time slot to detect whether to there is remote network devices.
5. a kind of circuit detecting remote network devices state as claimed in claim 4, it is characterized in that: this control circuit obtains the ohmically pressure drop of this analog to digital conversion circuit when this D/A converting circuit sends detection potential pulse, by calculating the electric current obtained on network line, judge whether remote network devices according to the comparative result of this current value and a preset value.
6. a kind of circuit detecting remote network devices state as claimed in claim 5, it is characterized in that: if connection remote network devices detected, this control circuit sends a link pulse signal at set intervals by network interface, and detected the signal on this network line by this detecting unit, when the link pulse signal that the signal detected is remote network devices, this control circuit sends the switch-over control signal of this double-point double-throw switch, controls this double-point double-throw switch and connects this network PHY circuit.
7. a kind of circuit detecting remote network devices state as claimed in claim 6, it is characterized in that: if detecting when far-end does not detect the link pulse signal of remote network devices without connection equipment or this detecting unit, this control circuit sends the energy-conservation signal of local device so that local device corresponding ports is operated under the pattern of low power consumption.
8. a kind of circuit detecting remote network devices state as claimed in claim 1, it is characterised in that: the amplitude of this potential pulse depends on the resolution of line length and this analog to digital conversion circuit and the maximum input voltage of remote network devices.
9. the method detecting remote network devices state, comprises the steps:
Step one, D/A converting circuit produces potential pulse under the control of control circuit；
Step 2, control circuit obtains the output of analog to digital conversion circuit to determine whether to connect remote network devices, and according to determining that output control sends link pulse signal by this network interface；
Step 3, utilizes the signal on detecting unit detection network line and feeds back to control circuit；
Step 4, control circuit controls the switching of this double-point double-throw switch according to the signal that this detecting unit detects.
10. a kind of method detecting remote network devices state as claimed in claim 9, it is characterized in that: in step 4, if detecting unit detects the link pulse signal of remote network devices, this control circuit controls this double-point double-throw switch and switches to main signal path；If detecting unit is not detected by the link pulse signal of remote network devices, this control circuit controls this double-point double-throw switch and switches to channel management circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610211380.2A CN105721225A (en) | 2016-04-07 | 2016-04-07 | Circuit and method for detecting state of far-end network device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610211380.2A CN105721225A (en) | 2016-04-07 | 2016-04-07 | Circuit and method for detecting state of far-end network device |
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| CN105721225A true CN105721225A (en) | 2016-06-29 |
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| CN201610211380.2A Pending CN105721225A (en) | 2016-04-07 | 2016-04-07 | Circuit and method for detecting state of far-end network device |
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| US20090015227A1 (en) * | 2007-07-10 | 2009-01-15 | Kae Ann Wong | Load-Induced Voltage Overshoot Detection And Correction In Switching Power Supplies |
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Application publication date: 20160629 |