CN203135887U - Grounding circuit structure of cable television RF output terminal of ONT with ungrounded power supply - Google Patents
Grounding circuit structure of cable television RF output terminal of ONT with ungrounded power supply Download PDFInfo
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- CN203135887U CN203135887U CN 201220696777 CN201220696777U CN203135887U CN 203135887 U CN203135887 U CN 203135887U CN 201220696777 CN201220696777 CN 201220696777 CN 201220696777 U CN201220696777 U CN 201220696777U CN 203135887 U CN203135887 U CN 203135887U
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Abstract
The utility model relates to a grounding circuit structure of a cable television RF output terminal of an ONT with an ungrounded power supply and belongs to the technical field of a circuit structure. The optical network terminal comprises a power adapter and a main machine, wherein the radiofrequency signal output terminal is arranged on the main machine, the power adapter is connected with the main machine through a DC transmission line and an adapter ground wire, the radiofrequency signal output terminal is connected with the adapter ground wire through a capacitor. The circuit structure solves the problem that an electrostatic discharge (ESD) pulse is induced to the MAC when an exposed radio frequency terminal on the optical network terminal is under ESD test, and ensures safe operation of the optical network terminal. The grounding circuit structure is simple in structure, low in cost and wide in application scope.
Description
Technical field
The utility model relates to the circuit structure technical field, and particularly earth-free optical communication equipment circuit structure technical field refers to that specifically the earth-free ONT of power supply goes up cable TV RF output head grounding circuit structure.
Background technology
In the ONT(Optical Network Terminal) in use under the situation of single fiber bi-directional three port optical modules as shown in Figure 1, when the data service up-downgoing was provided, the television set that also provides the CATV downstream television signals to be connected to the user was watched.Have cable TV radiofrequency signal (RF) output the optical communication equipment circuit structure structural representation as shown in Figure 2.Wherein, single fiber bi-directional three port optical modules are a kind ofly the 1490nm light signal can be converted to the output of difference, the high-speed figure signal of telecommunication, the 1550nm light signal converts broadband rf signal output to, the differential digital signal of telecommunication converts the light signal output of 1310nm to, and have the module that the emission burst enables to control function, and carry out transmitted in both directions at same optical fiber.
Large-scale communication product generally adopts metal shell, the I/O interface metal shell and the equipment casing that expose on the communication product well overlap, device housings is provided with special-purpose earthing rod, ESD(Electro-Static discharge, when static discharge) testing, electrostatic pulse directly from the ground connection the earth of releasing, has been avoided the interference to system.
Earth-free non-metal shell Miniature Terminal communication product, the RF(radio frequency of the CATV that exposes) metal shell will stand the ESD test equally, owing to can't connect the earth, and can only be with systematically linking to each other on the PCB of RF shell of CATV and device interior.Because equipment is smaller, MAC(Medium Access Control, medium access control) etc. acp chip and shell distance closer, so just cause the interference to system.When serious even cause system in case of system halt.
Especially third generation MAC is because core voltage is low, poor anti jamming capability, and the problem that causes because of RF the ESD of CATV is more serious.
The utility model content
The purpose of this utility model is to have overcome above-mentioned shortcoming of the prior art, providing a kind of is adopting on the earth-free Miniature Terminal communication product of non-metal shell, utilize the earthing mode on the PCB, when the ESD static discharge is stood in the termination of having avoided exposing on the earth-free Miniature Terminal communication product equipment electrostatic pulse is guided to the problem of MAC, the safe operation of assurance equipment, and it is simple in structure, with low cost, range of application is cable TV radiofrequency signal output head grounding circuit structure on the earth-free Optical Network Terminal of power supply comparatively widely.
In order to realize above-mentioned purpose, cable TV radiofrequency signal output head grounding circuit structure has following formation on the earth-free Optical Network Terminal of power supply of the present utility model:
Optical Network Terminal with the output of cable TV radiofrequency signal comprises power supply adaptor and main frame, described radiofrequency signal output is arranged at described main frame, described power supply adaptor is connected described main frame by DC transmission line with the adapter earth connection, and described radiofrequency signal output connects described adapter earth connection by electric capacity.
On the earth-free Optical Network Terminal of this power supply in the cable TV radiofrequency signal output head grounding circuit structure, the main frame of described Optical Network Terminal comprises insulation shell and is arranged at the interior single fiber bi-directional three port optical modules of described insulation shell, described radiofrequency signal output extends to outside the described insulation shell, and the SMA antennal interface of described single fiber bi-directional three port optical modules connects described radiofrequency signal output by coaxial cable.
On the earth-free Optical Network Terminal of this power supply in the cable TV radiofrequency signal output head grounding circuit structure, described main frame also comprises the main frame earthed circuit, described main frame earthed circuit connects described single fiber bi-directional three port optical modules, isolates by magnetic bead between described adapter earthed circuit and the described main frame earthed circuit.
On the earth-free Optical Network Terminal of this power supply in the cable TV radiofrequency signal output head grounding circuit structure, described main frame also comprises pcb board, described adapter earthed circuit and described main frame earthed circuit all are arranged on the described pcb board, and described single fiber bi-directional three port optical modules are fixedly connected on described pcb board.
In the cable TV radiofrequency signal output head grounding circuit structure, on described pcb board, the distance between described adapter earthed circuit and described main frame earthed circuit is greater than 2.032mm on the earth-free Optical Network Terminal of this power supply.
Adopted the cable TV radiofrequency signal output head grounding circuit structure of this utility model, because it comprises power supply adaptor and main frame, the radiofrequency signal output is arranged at described main frame, described power supply adaptor is connected described main frame by DC transmission line with the adapter earth connection, described radiofrequency signal output connects described adapter earth connection by electric capacity, thereby electrostatic pulse is guided to the problem of MAC in the radio frequency termination of having avoided exposing on the Optical Network Terminal when being subjected to the ESD electrostatic discharge testing, guarantee the safe operation of Optical Network Terminal, and cable TV radiofrequency signal output head grounding circuit structure is simple in structure on the earth-free Optical Network Terminal of power supply of the present utility model, with low cost, range of application is also comparatively extensive.
Description of drawings
Fig. 1 is the electrical block diagram of the single fiber bi-directional three port optical modules that Optical Network Terminal adopts in the prior art.
Fig. 2 is the structural representation that has the Optical Network Terminal circuit structure of cable TV radiofrequency signal output of the prior art.
Fig. 3 is the structural representation of cable TV radiofrequency signal output head grounding circuit structure on the earth-free Optical Network Terminal of power supply of the present utility model.
Embodiment
In order more to be expressly understood technology contents of the present utility model, describe in detail especially exemplified by following examples.
See also shown in Figure 3ly, be the structural representation of cable TV radiofrequency signal output head grounding circuit structure on the earth-free Optical Network Terminal of power supply of the present utility model.
In one embodiment, cable TV radiofrequency signal output head grounding circuit structure comprises power supply adaptor and main frame on the earth-free Optical Network Terminal of this power supply, and described radiofrequency signal output is arranged at described main frame.Described power supply adaptor is connected described main frame by DC transmission line with the adapter earth connection, and described radiofrequency signal output connects described adapter earth connection by electric capacity.The main frame of this cable television appliances comprises insulation shell and is arranged at the interior single fiber bi-directional three port optical modules of described insulation shell, described and radiofrequency signal output extends to outside the described insulation shell, and the SMA antennal interface of described single fiber bi-directional three port optical modules connects described radiofrequency signal output by coaxial cable.
In a kind of more preferably execution mode, described main frame also comprises the main frame earthed circuit, described main frame earthed circuit connects described single fiber bi-directional three port optical modules, isolates by magnetic bead between described adapter earthed circuit and the described main frame earthed circuit.
In preferred execution mode, described main frame also comprises pcb board, and described adapter earthed circuit and described main frame earthed circuit all are arranged on the described pcb board, and described single fiber bi-directional three port optical modules are fixedly connected on described pcb board.On this pcb board, the distance between described adapter earthed circuit and described main frame earthed circuit is greater than 2.032mm.
In actual applications, cable TV radiofrequency signal output head grounding circuit structure of the present utility model satisfies requirement:
1, the optical communication equipment that has cable TV signal output comprises signal transmission port and passes the RF head of the CATV of equipment non-metal shell, described non-metal shell is provided with the port through hole, and described signal transmission port extends to the described non-metal shell outside from described port through hole.
2, the RF head of described CATV is connected by high-voltage capacitance and power supply adaptor output 12V ground, and 12V ground and systematically isolating with magnetic bead.
3, described high-voltage capacitance requirement of withstand voltage is 2kV, appearance value 1000pF.
4, the CATV RF head that makes at this equipment of the existence of high-voltage capacitance is when CATV RF interface on the other grounding apparatus links to each other by cable, do not destroy the insulation request between the protective earthing and low pressure ground in the whole system.
Stipulate among the new standard GB 8898-2011, answer the insulation resistance requirement of satisfying basic insulation between cable network antenna coaxial socket and the protective earthing circuit.So new have antenna isolator built-in or that add on TV, under these circumstances, also high-voltage capacitance can be saved, be exactly 12V ground directly to be exported with power supply adaptor in the RF termination of CATV be connected.
5, isolation distance requires greater than the 80mil(mil, 80mil=2.032mm) on 12V ground on the PCB and systematically.
6, electronic equipment interfaces also comprises signal transmission circuit, and described signal transmission circuit is arranged in the described non-metal shell, and this signal transmission circuit is connected in described signal transmission port.
Adopted the cable TV radiofrequency signal output head grounding circuit structure of this utility model, because it comprises power supply adaptor and main frame, the radiofrequency signal output is arranged at described main frame, described power supply adaptor is connected described main frame by DC transmission line with the adapter earth connection, described radiofrequency signal output connects described adapter earth connection by electric capacity, thereby electrostatic pulse is guided to the problem of MAC in the radio frequency termination of having avoided exposing on the Optical Network Terminal when being subjected to the ESD electrostatic discharge testing, guarantee the safe operation of Optical Network Terminal, and cable TV radiofrequency signal output head grounding circuit structure is simple in structure on the earth-free Optical Network Terminal of power supply of the present utility model, with low cost, range of application is also comparatively extensive.
In this specification, the utility model is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from spirit and scope of the present utility model.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (5)
1. the earth-free ONT of power supply goes up cable TV RF output head grounding circuit structure, Optical Network Terminal with the output of cable TV radiofrequency signal comprises power supply adaptor and main frame, described radiofrequency signal output is arranged at described main frame, it is characterized in that, described power supply adaptor is connected described main frame by DC transmission line with the adapter earth connection, and described radiofrequency signal output connects described adapter earth connection by electric capacity.
2. the earth-free ONT of power supply according to claim 1 goes up cable TV RF output head grounding circuit structure, it is characterized in that, the main frame of described Optical Network Terminal comprises insulation shell and is arranged at the interior single fiber bi-directional three port optical modules of described insulation shell, described radiofrequency signal output extends to outside the described insulation shell, and the SMA antennal interface of described single fiber bi-directional three port optical modules connects described radiofrequency signal output by coaxial cable.
3. the earth-free ONT of power supply according to claim 2 goes up cable TV RF output head grounding circuit structure, it is characterized in that, described main frame also comprises the main frame earthed circuit, described main frame earthed circuit connects described single fiber bi-directional three port optical modules, isolates by magnetic bead between described adapter earthed circuit and the described main frame earthed circuit.
4. the earth-free ONT of power supply according to claim 3 goes up cable TV RF output head grounding circuit structure, it is characterized in that, described main frame also comprises pcb board, described adapter earthed circuit and described main frame earthed circuit all are arranged on the described pcb board, and described single fiber bi-directional three port optical modules are fixedly connected on described pcb board.
5. the earth-free ONT of power supply according to claim 4 goes up cable TV RF output head grounding circuit structure, it is characterized in that on described pcb board, the distance between described adapter earthed circuit and described main frame earthed circuit is greater than 2.032mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220696777 CN203135887U (en) | 2012-12-17 | 2012-12-17 | Grounding circuit structure of cable television RF output terminal of ONT with ungrounded power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220696777 CN203135887U (en) | 2012-12-17 | 2012-12-17 | Grounding circuit structure of cable television RF output terminal of ONT with ungrounded power supply |
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| Publication Number | Publication Date |
|---|---|
| CN203135887U true CN203135887U (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220696777 Expired - Lifetime CN203135887U (en) | 2012-12-17 | 2012-12-17 | Grounding circuit structure of cable television RF output terminal of ONT with ungrounded power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109416496A (en) * | 2016-07-22 | 2019-03-01 | 剑桥机电有限公司 | PWM shielding in camera |
-
2012
- 2012-12-17 CN CN 201220696777 patent/CN203135887U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109416496A (en) * | 2016-07-22 | 2019-03-01 | 剑桥机电有限公司 | PWM shielding in camera |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130814 |
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| CX01 | Expiry of patent term |