CN112865837B - Communication apparatus and communication system - Google Patents
Communication apparatus and communication system Download PDFInfo
- Publication number
- CN112865837B CN112865837B CN202011633511.9A CN202011633511A CN112865837B CN 112865837 B CN112865837 B CN 112865837B CN 202011633511 A CN202011633511 A CN 202011633511A CN 112865837 B CN112865837 B CN 112865837B
- Authority
- CN
- China
- Prior art keywords
- diode
- capacitor
- module
- noise
- negative electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Filters And Equalizers (AREA)
Abstract
The invention discloses a communication device, which is connected with a local side through a symmetrical line, and comprises: the lightning protection module comprises a transformer, a first capacitor and a second capacitor; two ends of a primary winding of the transformer are respectively connected with the symmetrical lines and are used for inhibiting common-mode lightning stroke energy introduced by the symmetrical lines; the first capacitor, the second capacitor and the transformer form a signal conditioning circuit which is used for filtering low-frequency noise in noise signals collected by the symmetry line; the filtering module is connected with the lightning protection module and is used for filtering high-frequency noise in the noise signals collected by the symmetrical line; and the main control module is used for carrying out operation processing on the noise signals for filtering the low-frequency noise and the high-frequency noise. The embodiment of the invention also discloses a communication system. By adopting the embodiment of the invention, the noise signal coupled to the DSL link can be accurately collected, the lightning protection function is realized, and the environmental noise can be effectively collected in the lightning environment.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a communication device and a communication system.
Background
DSL (Digital Subscriber Line) is a combination of transmission technologies using telephone lines as transmission media, and supports symmetric and asymmetric transmission modes on a Subscriber loop of a public telephone network, thereby solving the problem of transmission bottleneck often occurring between a network service provider and an end user in the last kilometer. For many years, communication service providers have measured the power of noise in the line to determine acceptability with respect to noise. However, in the current DSL equipment, since a certain distance exists between the power line and the DSL communication transmission line, noise coupled to the DSL communication line cannot be reflected truly, and in addition, RF noise generated by radio equipment such as AM and FM in the space cannot be collected, and a lightning protection design is not considered, so that lightning stroke damage is easily caused.
Disclosure of Invention
The embodiment of the invention aims to provide communication equipment and a communication system, which can accurately acquire noise signals coupled to a DSL link, have a lightning protection function and can effectively acquire environmental noise in a lightning environment.
In order to achieve the above object, an embodiment of the present invention provides a communication device, where the communication device is connected to a central office through a symmetric line, and the communication device includes:
the lightning protection module comprises a transformer, a first capacitor and a second capacitor; two ends of a primary winding of the transformer are respectively connected with the symmetrical lines and are used for inhibiting common-mode lightning stroke energy introduced by the symmetrical lines; the first capacitor, the second capacitor and the transformer form a signal conditioning circuit which is used for filtering low-frequency noise in noise signals collected by the symmetry line;
the filtering module is connected with the lightning protection module and is used for filtering high-frequency noise in the noise signals collected by the symmetrical line;
and the main control module is used for carrying out operation processing on the noise signals for filtering the low-frequency noise and the high-frequency noise.
As an improvement of the above scheme, the lightning protection module further includes a gas discharge tube, the gas discharge tube is connected to the secondary winding of the transformer, and the gas discharge tube is used for absorbing the energy of the differential mode lightning strike.
As an improvement of the above scheme, the lightning protection module further includes a common mode energy absorption module, and the common mode energy absorption module includes a first diode, a second diode, a third diode, and a fourth diode; wherein the content of the first and second substances,
the negative electrode of the first diode is grounded, the positive electrode of the first diode is connected with the positive electrode of the second diode, the negative electrode of the second diode is connected with the input end of the common-mode energy absorption module, the negative electrode of the third diode is connected with the input end of the common-mode energy absorption module, the positive electrode of the third diode is connected with the positive electrode of the fourth diode, and the negative electrode of the fourth diode is grounded.
As an improvement of the above scheme, the lightning protection module includes two common mode energy absorption modules, and the two common mode energy absorption modules are respectively connected to the first end and the second end of the primary winding of the transformer.
As an improvement of the above scheme, the lightning protection module further includes a differential mode energy absorption module, and the differential mode energy absorption module includes a fifth diode, a sixth diode, a seventh diode, and an eighth diode; wherein the content of the first and second substances,
the negative electrode of the fifth diode is connected with the first end of the primary winding, the positive electrode of the fifth diode is connected with the positive electrode of the sixth diode, the negative electrode of the sixth diode is connected with the second end of the primary winding, the negative electrode of the seventh diode is connected with the second end of the primary winding, the positive electrode of the seventh diode is connected with the positive electrode of the eighth diode, and the negative electrode of the eighth diode is connected with the first end of the primary winding.
As an improvement of the above solution, the lightning protection module further includes a voltage absorbing module, and the voltage absorbing module includes a ninth diode, a twelfth diode, an eleventh diode, and a twelfth diode; wherein the content of the first and second substances,
the negative electrode of the ninth diode is connected with a power supply end, the positive electrode of the ninth diode is connected with the input end of the voltage absorption module, the negative electrode of the twelfth diode is connected with the input end of the voltage absorption module, the positive electrode of the twelfth diode is connected with the negative electrode of the eleventh diode, the positive electrode of the eleventh diode is connected with the negative electrode of the twelfth diode, and the positive electrode of the twelfth diode is grounded.
As an improvement of the above scheme, the lightning protection module includes two voltage absorption modules, and the two voltage absorption modules are respectively connected to the first end and the second end of the primary winding of the transformer.
As an improvement of the above scheme, the filtering module includes a first resistor, a second resistor, a first inductor, a second inductor, a third capacitor, a fourth capacitor, and a fifth capacitor; wherein the content of the first and second substances,
a first end of the first resistor is connected to a first input end of the filtering module, a second end of the first resistor is connected to a first end of the first inductor, a second end of the first inductor is connected to a first end of the fourth capacitor, and a second end of the fourth capacitor is connected to a first output end of the filtering module;
a first end of the second resistor is connected to a second input end of the filter module, a second end of the second resistor is connected to a first end of the second inductor, a second end of the second inductor is connected to a first end of the fifth capacitor, and a second end of the fifth capacitor is connected to a second output end of the filter module;
the first end of the third capacitor is connected with the second end of the first inductor, and the second end of the third capacitor is connected with the second end of the second inductor.
As an improvement of the scheme, the low-frequency noise is noise with the cut-off frequency smaller than 31KHz, and the high-frequency noise is noise with the cut-off frequency larger than 35 MHz.
In order to achieve the above object, an embodiment of the present invention further provides a communication system, including a local side and the communication device described in any of the above embodiments; wherein, the local side is connected with the communication equipment through a symmetrical line.
Compared with the prior art, the communication equipment and the communication system provided by the embodiment of the invention firstly inhibit common-mode lightning stroke energy introduced by a symmetrical line through a transformer in the lightning protection module; then, a signal conditioning circuit is formed by the first capacitor, the second capacitor and the transformer to filter low-frequency noise in noise signals acquired by the symmetry line; meanwhile, high-frequency noise in noise signals collected by the symmetrical lines is filtered through a filtering module; and finally, the main control module is used for carrying out operation processing on the noise signals with the low-frequency noise and the high-frequency noise being filtered. The noise signal coupled to the DSL link can be accurately collected, the lightning protection function is realized, and the environmental noise can be effectively collected in the lightning environment.
Drawings
Fig. 1 is a block diagram of a communication device according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a lightning protection module provided by an embodiment of the invention;
FIG. 3 is a circuit diagram of a common mode energy absorption module provided by an embodiment of the invention;
FIG. 4 is a circuit diagram of a differential mode energy absorbing module provided by an embodiment of the present invention;
FIG. 5 is a circuit diagram of a voltage sinking module provided by an embodiment of the present invention;
FIG. 6 is a circuit diagram of a filtering module according to an embodiment of the present invention;
fig. 7 is a block diagram of another communication device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a block diagram of a communication device 100 according to an embodiment of the present invention, where the communication device 100 includes:
a lightning protection module 10 including a transformer, a first capacitor and a second capacitor; two ends of a primary winding of the transformer are respectively connected with the symmetrical lines and are used for inhibiting common-mode lightning stroke energy introduced by the symmetrical lines; the first capacitor, the second capacitor and the transformer form a signal conditioning circuit which is used for filtering low-frequency noise in noise signals collected by the symmetry line;
the filtering module 20 is connected with the lightning protection module and is used for filtering high-frequency noise in the noise signals collected by the symmetric line;
the main control module 30 is configured to perform operation processing on the noise signal with low-frequency noise and high-frequency noise filtered.
Specifically, the communication device 100 and the local end 200 are connected by a symmetric line, the symmetric line is a twisted pair, in the embodiment of the present invention, noise of an external environment is collected by adding a pair of twisted pairs to a DSL communication link, low-frequency noise is filtered by the lightning protection module 10, high-frequency noise is filtered by the filtering module 20, and the main control module 30 performs operation on the filtered noise signal and the collected DSL useful signal, so as to cancel the influence of the external noise on the noise signal and improve the robustness of the communication device.
Referring to fig. 2, the lightning protection module includes a transformer T1, a first capacitor C1, and a second capacitor C2, and two ends of a primary winding of the transformer are respectively connected to the symmetry line for suppressing common mode lightning stroke energy introduced by the symmetry line. The first capacitor C1, the second capacitor C2 and the transformer T1 form a signal conditioning circuit which is used for filtering low-frequency noise in noise signals acquired by the symmetrical line. Illustratively, the low-frequency noise is noise having a cutoff frequency of less than 31 KHz.
Specifically, when a common-mode overvoltage is applied to the primary winding of the transformer T1 (input from the first input terminal IN1 of the lightning protection module 10 and the second input terminal IN2 of the lightning protection module 10), the overvoltage to ground on the primary winding cannot be transmitted to the secondary winding by electromagnetic induction, and the electro-magnetic-electric conversion function fails. However, due to the existence of the distributed capacitors (between windings and iron cores, between windings, between layer turns and between leads), the common-mode overvoltage is coupled to the secondary winding through the distributed capacitors, and the common-mode overvoltage is greatly suppressed after being transmitted to the secondary winding through the primary winding. In addition, transformer T1 also plays the effect of keeping apart, enlargiing the noise signal, guarantees the noise in the noise signal's the more laminating actual environment of gathering.
Further, the lightning protection module 10 further includes a gas discharge tube DG, the gas discharge tube DG is connected to the secondary winding of the transformer, and the gas discharge tube is used for absorbing the energy of the differential mode lightning strike. In addition, the on-state voltage of the gas discharge tube is set to be more than 400V, so that the phenomena of equipment damage and fire caused by the lap joint of the power lines and the induction of the power lines can be prevented.
Further, the lightning protection module 10 further includes a common mode energy absorption module 11, referring to fig. 3, the common mode energy absorption module 11 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; wherein the content of the first and second substances,
the negative electrode of the first diode D1 is grounded, the positive electrode of the first diode D1 is connected with the positive electrode of the second diode D2, the negative electrode of the second diode D2 is connected with the input end IN11 of the common mode energy absorption module 11, the negative electrode of the third diode D3 is connected with the input end IN11 of the common mode energy absorption module 11, the positive electrode of the third diode D3 is connected with the positive electrode of the fourth diode D4, and the negative electrode of the fourth diode D4 is grounded.
It should be noted that the lightning protection module 10 includes two common mode energy absorption modules (11 and 13 in fig. 2), which are respectively connected to the first end and the second end of the primary winding of the transformer T1. The common mode energy absorption module 11 mainly absorbs common mode energy, and the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 mainly absorb voltage energy remaining in the anti-detonator and the transformer, so as to prevent the energy from entering a rear stage and causing damage to a physical layer PHY of the main control module 30. Illustratively, the first diode D1 and the third diode D3 are TVS (transient diodes), and the second diode D2 and the fourth diode D4 are normal diodes.
Further, the lightning protection module 10 further includes a differential mode energy absorption module 12, referring to fig. 4, the differential mode energy absorption module 12 includes a fifth diode D5, a sixth diode D6, a seventh diode D7, and an eighth diode D8; wherein, the first and the second end of the pipe are connected with each other,
the negative electrode of the fifth diode D5 is connected with the first end of the primary winding, the positive electrode of the fifth diode D5 is connected with the positive electrode of the sixth diode D6, the negative electrode of the sixth diode D6 is connected with the second end of the primary winding, the negative electrode of the seventh diode D7 is connected with the second end of the primary winding, the positive electrode of the seventh diode D7 is connected with the positive electrode of the eighth diode D8, and the negative electrode of the eighth diode D8 is connected with the first end of the primary winding.
It is worth noting that the differential mode energy absorption module 12 primarily absorbs differential mode energy. Illustratively, the fifth diode D5 and the seventh diode D7 are TVS (transient diodes), and the sixth diode D6 and the eighth diode D8 are normal diodes.
Further, the lightning protection module 10 further includes a voltage absorption module 14, referring to fig. 5, the voltage absorption module 14 includes a ninth diode D9, a twelfth diode D10, an eleventh diode D11, and a twelfth diode D12; wherein the content of the first and second substances,
the negative electrode of the ninth diode D9 is connected to a power supply terminal VCC, the positive electrode of the ninth diode D9 is connected to an input terminal IN15 of the voltage absorption module 14, the negative electrode of the twelfth diode D10 is connected to the input terminal IN15 of the voltage absorption module 14, the positive electrode of the twelfth diode D10 is connected to the negative electrode of the eleventh diode D11, the positive electrode of the eleventh diode D11 is connected to the negative electrode of the twelfth diode D12, and the positive electrode of the twelfth diode D12 is grounded.
It should be noted that the lightning protection module 10 includes two voltage absorption modules (14 and 15 in fig. 2), which are respectively connected to the first end and the second end of the primary winding of the transformer T1. The voltage absorption module mainly conducts residual voltage to GND and VCC, plays a role in absorbing residual voltage of the anti-detonator, and also plays a role in offsetting EOS (electrical over stress) overvoltage signals.
Further, referring to fig. 6, the filtering module 20 includes a first resistor R1, a second resistor R2, a first inductor L1, a second inductor L2, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5; wherein the content of the first and second substances,
a first end of the first resistor R1 is connected to a first input end IN3 of the filter module 20, the first input end IN3 is connected to a first output end OUT1 of the lightning protection module 10, a second end of the first resistor R1 is connected to a first end of the first inductor L1, a second end of the first inductor L1 is connected to a first end of the fourth capacitor C4, and a second end of the fourth capacitor C4 is connected to a first output end OUT3 of the filter module 20;
a first end of the second resistor R2 is connected to a second input end IN4 of the filter module 20, the second input end IN4 is connected to a second output end OUT2 of the lightning protection module 10, a second end of the second resistor R2 is connected to a first end of the second inductor L2, a second end of the second inductor L2 is connected to a first end of the fifth capacitor C5, and a second end of the fifth capacitor C5 is connected to a second output end OUT4 of the filter module 20;
a first end of the third capacitor C3 is connected to the second end of the first inductor L1, and a second end of the third capacitor C3 is connected to the second end of the second inductor L2.
Specifically, the first resistor R1, the second resistor R2, the first inductor L1, the second inductor L2, the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5 form a low-pass filter, the filtering module 20 mainly filters out high-frequency noise, and high-frequency noise caused by nonlinearity of various active and passive devices is also included in the high-frequency noise, so that noise collected by the communication device in the DSL operating frequency band is ensured. Illustratively, the high frequency noise is noise having a cutoff frequency greater than 35 MHz.
Furthermore, the VDSL can be supported to 35B at maximum, the working bandwidth can be extended to 35M, after passing through the low pass filter, the signal is sampled by the analog-to-digital converter of 16 bits, the sampled signal is sent to the PHY (physical layer) of the main control module 30 to perform echo cancellation, further processing is performed by TEQ, FFT and the like, and the PHY operates the collected noise signal and the DSL communication line on the received useful signal, so that the environmental noise coupled to the DSL link is eliminated, and the performance and robustness of the DSL link are improved. In addition, the collected environmental noise can be displayed on the equipment in a graphic form, so that maintenance personnel can conveniently perform diagnostic test on the link, and meanwhile, the collected environmental noise is transmitted to the central office 200, so that the performance of the uplink can be improved.
Further, referring to fig. 7, fig. 7 is a block diagram of another communication device 100 according to an embodiment of the present invention, where the communication device 100 further includes a Hybrid circuit 40, a DSL link transformer 50, and a DSL line driver60.
The DSL line driver60 mainly performs filtering processing on the DSL TX signal, and the Hybrid circuit 40 mainly performs echo cancellation and filters random common mode noise.
Compared with the prior art, the communication device 100 according to the embodiment of the present invention firstly suppresses common-mode lightning strike energy introduced by a symmetric line through the transformer T1 in the lightning protection module 10; then, a signal conditioning circuit is formed by the first capacitor C1, the second capacitor C2 and the transformer T1 to filter low-frequency noise in noise signals acquired by the symmetrical line; meanwhile, high-frequency noise in the noise signals collected by the symmetric line is filtered by the filtering module 20; and finally, the main control module 30 performs operation processing on the noise signals with low-frequency noise and high-frequency noise filtered. The noise signal coupled to the DSL link can be accurately collected, the lightning protection function is realized, and the environmental noise can be effectively collected in the lightning environment. In addition, the DSL link rate can be improved by using the collected accurate noise, the user experience is improved, and meanwhile, a visual web interface can be made by using the collected noise, so that the maintenance is convenient.
The embodiment of the present invention further provides a communication system, where the communication system includes a local side 200 and the communication device 100 described in the above embodiment; wherein, the central office 200 and the communication device 100 are connected by a symmetry line.
For a specific working process of the communication device 100, please refer to the working process of the communication device 100 described in the foregoing embodiment, which is not described herein again.
Compared with the prior art, the communication system provided by the embodiment of the invention firstly inhibits common-mode lightning stroke energy introduced by a symmetrical line through the transformer T1 in the communication equipment 100; then, a signal conditioning circuit is formed by the first capacitor C1, the second capacitor C2 and the transformer T1 to filter low-frequency noise in noise signals acquired by the symmetrical line; meanwhile, the high-frequency noise in the noise signal collected by the symmetric line is filtered by the filtering module 20; and finally, the main control module 30 performs operation processing on the noise signals with low-frequency noise and high-frequency noise filtered. The noise signal coupled to the DSL link can be accurately collected, the lightning protection function is realized, and the environmental noise can be effectively collected in the lightning environment. In addition, the DSL link rate can be improved by using the collected accurate noise, the user experience is improved, and meanwhile, a visual web interface can be made by using the collected noise, so that the maintenance is convenient.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A communication device characterized in that the communication device is connected to a central office through a line of symmetry, the communication device comprising:
the lightning protection module comprises a transformer, a first capacitor and a second capacitor; two ends of a primary winding of the transformer are respectively connected with the symmetrical lines and are used for inhibiting common-mode lightning stroke energy introduced by the symmetrical lines; the first capacitor, the second capacitor and the transformer form a signal conditioning circuit which is used for filtering low-frequency noise in noise signals acquired by the symmetric line;
the filtering module is connected with the lightning protection module and is used for filtering high-frequency noise in the noise signals acquired by the symmetrical line;
the main control module is used for carrying out operation processing on the noise signals for filtering the low-frequency noise and the high-frequency noise;
the lightning protection module further comprises a voltage absorption module, wherein the voltage absorption module comprises a ninth diode, a twelfth diode, an eleventh diode and a twelfth diode; the negative electrode of the ninth diode is connected with a power supply end, the positive electrode of the ninth diode is connected with the input end of the voltage absorption module, the negative electrode of the twelfth diode is connected with the input end of the voltage absorption module, the positive electrode of the twelfth diode is connected with the negative electrode of the eleventh diode, the positive electrode of the eleventh diode is connected with the negative electrode of the twelfth diode, and the positive electrode of the twelfth diode is grounded.
2. The communication device of claim 1, wherein the lightning protection module further comprises a gas discharge tube connected to the secondary winding of the transformer, the gas discharge tube configured to absorb differential mode lightning strike energy.
3. The communication device of claim 1, wherein the lightning protection module further comprises a common mode energy absorption module comprising a first diode, a second diode, a third diode, and a fourth diode; wherein the content of the first and second substances,
the negative electrode of the first diode is grounded, the positive electrode of the first diode is connected with the positive electrode of the second diode, the negative electrode of the second diode is connected with the input end of the common-mode energy absorption module, the negative electrode of the third diode is connected with the input end of the common-mode energy absorption module, the positive electrode of the third diode is connected with the positive electrode of the fourth diode, and the negative electrode of the fourth diode is grounded.
4. The communication device of claim 3, wherein the lightning protection module comprises two common mode energy absorption modules connected to the first and second ends of the primary winding of the transformer, respectively.
5. The communication device of claim 1, wherein the lightning protection module further comprises a differential mode energy absorption module comprising a fifth diode, a sixth diode, a seventh diode, and an eighth diode; wherein, the first and the second end of the pipe are connected with each other,
the negative electrode of the fifth diode is connected with the first end of the primary winding, the positive electrode of the fifth diode is connected with the positive electrode of the sixth diode, the negative electrode of the sixth diode is connected with the second end of the primary winding, the negative electrode of the seventh diode is connected with the second end of the primary winding, the positive electrode of the seventh diode is connected with the positive electrode of the eighth diode, and the negative electrode of the eighth diode is connected with the first end of the primary winding.
6. The communication device of claim 1, wherein the lightning protection module comprises two voltage absorbing modules, the two voltage absorbing modules being connected to the first end and the second end of the primary winding of the transformer, respectively.
7. The communication device of claim 1, wherein the filtering module comprises a first resistor, a second resistor, a first inductor, a second inductor, a third capacitor, a fourth capacitor, and a fifth capacitor; wherein the content of the first and second substances,
a first end of the first resistor is connected to a first input end of the filtering module, a second end of the first resistor is connected to a first end of the first inductor, a second end of the first inductor is connected to a first end of the fourth capacitor, and a second end of the fourth capacitor is connected to a first output end of the filtering module;
a first end of the second resistor is connected to a second input end of the filter module, a second end of the second resistor is connected to a first end of the second inductor, a second end of the second inductor is connected to a first end of the fifth capacitor, and a second end of the fifth capacitor is connected to a second output end of the filter module;
the first end of the third capacitor is connected with the second end of the first inductor, and the second end of the third capacitor is connected with the second end of the second inductor.
8. The communication device of claim 1, wherein the low frequency noise is noise having a cutoff frequency of less than 31KHz and the high frequency noise is noise having a cutoff frequency of greater than 35 MHz.
9. A communication system comprising a central office and a communication apparatus according to any one of claims 1 to 8; wherein, the local side is connected with the communication equipment through a symmetrical line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011633511.9A CN112865837B (en) | 2020-12-31 | 2020-12-31 | Communication apparatus and communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011633511.9A CN112865837B (en) | 2020-12-31 | 2020-12-31 | Communication apparatus and communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112865837A CN112865837A (en) | 2021-05-28 |
| CN112865837B true CN112865837B (en) | 2022-11-08 |
Family
ID=76000089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011633511.9A Active CN112865837B (en) | 2020-12-31 | 2020-12-31 | Communication apparatus and communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112865837B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253259A (en) * | 2016-10-13 | 2016-12-21 | 广西大学 | A kind of multiple lightning protection device of CAN |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101546909A (en) * | 2008-03-25 | 2009-09-30 | 华为技术有限公司 | Protective circuit, communication equipment and method for protecting device in communication equipment |
| JP2013157708A (en) * | 2012-01-27 | 2013-08-15 | Panasonic Corp | Interface circuit for power line communication |
| CN103474977B (en) * | 2013-09-30 | 2016-10-05 | 深圳科安达电子科技股份有限公司 | A kind of lightning protection device, lightning protection combination and lightning protection cabinet |
| CN104536416B (en) * | 2014-12-25 | 2017-05-10 | 重庆川仪自动化股份有限公司 | Analog quantity input acquisition circuit for restraining electromagnetic interference in industrial control system |
| CN211701987U (en) * | 2020-04-26 | 2020-10-16 | 珠海妙微科技有限公司 | Anti-interference signal acquisition circuit |
-
2020
- 2020-12-31 CN CN202011633511.9A patent/CN112865837B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253259A (en) * | 2016-10-13 | 2016-12-21 | 广西大学 | A kind of multiple lightning protection device of CAN |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112865837A (en) | 2021-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103227653B (en) | Receiver | |
| US9596002B2 (en) | Transceiver front-end for communication over power lines | |
| CN112769136B (en) | Filter circuit, power supply equipment and power supply system | |
| US7952846B2 (en) | Power line communication method | |
| CN101546909A (en) | Protective circuit, communication equipment and method for protecting device in communication equipment | |
| CN112865837B (en) | Communication apparatus and communication system | |
| US6597768B2 (en) | Method and apparatus for coupling a voiceband modem circuit to a common phoneline connector | |
| CN213212572U (en) | Lightning protection type anti-interference isolator of electric power meter reading system | |
| CN101505174A (en) | Interface circuit and method for suppressing electromagnetic interference | |
| CN102082886B (en) | Circuit and equipment of digital subscriber line | |
| US10750029B2 (en) | Signal splitter/combiner with an electro-magnetic interference filter | |
| CN201160222Y (en) | Second-generation extremely high speed digital subscriber line protection circuit | |
| US8315378B2 (en) | Hybrid circuit without inductors | |
| CN210609172U (en) | Three-phase coupling circuit for carrier communication of power grid system | |
| CA2326929C (en) | A frequency sensitive inductance device in pots splitter design | |
| CN101976831A (en) | Gigabit LAN (Local Area Network) lightning arrester with PoE (Power on Ethernet) function | |
| US6396673B1 (en) | Reduced-loss, high-frequency signal transmission system utilizing an over-voltage and over-current protection device | |
| CA2997088A1 (en) | Signal splitter/combiner with an electro-magnetic interference filter | |
| US20090122880A1 (en) | Filter for bpl signal | |
| CN220822912U (en) | EMC filter circuit | |
| CN107733469A (en) | A kind of power wire broadband carrier communication anti-jamming circuit | |
| CN201718009U (en) | Signal separator and digital individual line access multiplexing system | |
| KR20010018110A (en) | Device for LAN Data Transmission | |
| CN209896693U (en) | High definition video signal lightning protection circuit | |
| KR20170109484A (en) | Network device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 518000 room 101-601, building 5, block 30, No. 2 Kefa Road, Science Park community, Yuehai street, Nanshan District, Shenzhen, Guangdong Province (there is a business place at 401-601, fulizhen building to engage in production and business activities) Patentee after: Shenzhen Lianzhou International Technology Co.,Ltd. Address before: 5 / F, fulizhen building, No.1, Kefa Road, high tech park, Nanshan District, Shenzhen, Guangdong 518000 Patentee before: SHENZHEN PUWEI TECHNOLOGY CO.,LTD. |