Network management type cable television corridor optical receiver

Abstract

The utility model discloses a network management type cable television corridor optical receiver, which is characterized in that the input end of a photoelectric conversion circuit is connected with an optical signal of a cable television network, the output end of the photoelectric conversion circuit is connected with the input end of a first amplification circuit, and the output end of the first amplification circuit is connected with the input end of an optical AGC (Automatic Gain Control) circuit; the output end of the optical AGC circuit is connected with the input end of the second amplification circuit, the output end of the second amplification circuit is connected with the input end of the program-controlled equalization circuit, the output end of the program-controlled equalization circuit is connected with the input end of the program-controlled attenuation circuit, and the output end of the program-controlled attenuation circuit is connected with the input end of the third amplification circuit. The output end of the third amplifying circuit is connected with the input end of the fourth amplifying circuit, and the output end of the fourth amplifying circuit is connected with a radio frequency signal of a cable television network; the microprocessor circuit is respectively connected with the photoelectric conversion circuit, the optical AGC circuit, the program control equalization circuit, the program control attenuation circuit, the display circuit, the network management interface circuit and the key circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of cable television, in particular to a network-managed cable television corridor optical receiver. Background Art

[0002] The corridor optical receiver is an important transmission device in the cable TV network and is widely used in the cable TV system. The network-managed cable TV corridor optical receiver with a network management interface also has digital display of input optical power, optical AGC control, digital control and display of attenuation and equalization, and RF signal output level display, and can have an Ethernet network management interface to achieve remote monitoring and control, and is suitable for 1218MHz cable TV system transmission network.

[0003] Aiming at the problems existing in the prior art, a network-managed cable TV corridor optical receiver is provided. Utility Model Content

[0004] The utility model aims to provide a network-managed cable TV corridor optical receiver in view of the defects of the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A network-managed cable TV corridor optical receiver, comprising a photoelectric conversion circuit, a first amplifying circuit, an optical AGC circuit, a second amplifying circuit, a program-controlled equalizing circuit, a program-controlled attenuation circuit, a third amplifying circuit, a fourth amplifying circuit, a microprocessor circuit, a display circuit, a network management interface circuit, and a key circuit;

[0007] The input end of the photoelectric conversion circuit is connected to the optical signal of the cable TV network, the output end of the photoelectric conversion circuit is connected to the input end of the first amplifier circuit, the output end of the first amplifier circuit is connected to the input end of the optical AGC circuit, the output end of the optical AGC circuit is connected to the input end of the second amplifier circuit, the output end of the second amplifier circuit is connected to the input end of the program-controlled equalization circuit, the output end of the program-controlled equalization circuit is connected to the input end of the program-controlled attenuation circuit, the output end of the program-controlled attenuation circuit is connected to the input end of the third amplifier circuit, the output end of the third amplifier circuit is connected to the input end of the fourth amplifier circuit, and the output end of the fourth amplifier circuit is connected to the radio frequency signal of the cable TV network;

[0008] The output end of the photoelectric conversion circuit is also connected to the microprocessor circuit, and the microprocessor circuit is also respectively connected to the optical AGC circuit, the program-controlled equalization circuit, the program-controlled attenuation circuit, the display circuit, the network management interface circuit, and the key circuit.

[0009] Furthermore, the model of the photoelectric conversion circuit is ZBLPD-PFA1-75AR.

[0010] Furthermore, the model of the first amplifier circuit is SG110.

[0011] Furthermore, the second amplifier circuit and the third amplifier circuit both use SG101.

[0012] Furthermore, the model adopted by the fourth amplifier circuit is AE618.

[0013] Furthermore, the optical AGC circuit, programmable equalization circuit, and programmable attenuation circuit all use ARW621A.

[0014] Furthermore, the microprocessor circuit adopts a model of STC12C5608AD.

[0015] Furthermore, the display circuit adopts a four-digit 0.28-inch common cathode digital tube.

[0016] Furthermore, the network management interface circuit adopts the model PIC18F67J60.

[0017] Furthermore, the key circuit adopts a touch switch.

[0018] Compared with the prior art, the network-managed cable TV corridor optical receiver of the utility model is suitable for the cable TV system transmission network, has digital display of input optical power, optical AGC control, digital control and display of attenuation and equalization, RF signal output level display, and can have an Ethernet network management interface to achieve remote monitoring and control. It is convenient for the operation and maintenance of the cable TV system transmission network and improves the work efficiency of the operation and maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a structural diagram of a network-managed cable TV corridor optical receiver provided in an embodiment. DETAILED DESCRIPTION

[0020] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0021] The utility model aims to provide a network-managed cable TV corridor optical receiver in view of the defects of the prior art.

[0022] Example

[0023] This embodiment provides a network-managed cable TV corridor optical receiver, such as Figure 1 As shown, it includes a photoelectric conversion circuit 1, a first amplifier circuit 2, an optical AGC circuit 3, a second amplifier circuit 4, a programmable equalization circuit 5, a programmable attenuation circuit 6, a third amplifier circuit 7, a fourth amplifier circuit 8, a microprocessor circuit 9, a display circuit 10, a network management interface circuit 11, and a button circuit 12.

[0024] The input end of the photoelectric conversion circuit 1 is connected to the optical signal of the cable TV network, the output end of the photoelectric conversion circuit 1 is connected to the input end of the first amplifier circuit 2, the output end of the first amplifier circuit 2 is connected to the input end of the optical AGC circuit 3, the output end of the optical AGC circuit 3 is connected to the input end of the second amplifier circuit 4, the output end of the second amplifier circuit 4 is connected to the input end of the program-controlled equalization circuit 5, the output end of the program-controlled equalization circuit 5 is connected to the input end of the program-controlled attenuation circuit 6, the output end of the program-controlled attenuation circuit 6 is connected to the input end of the third amplifier circuit 7, the output end of the third amplifier circuit 7 is connected to the input end of the fourth amplifier circuit 8, and the output end of the fourth amplifier circuit 8 is connected to the radio frequency signal of the cable TV network; the output end of the photoelectric conversion circuit 1 is also connected to the microprocessor circuit 9, and the microprocessor circuit 9 is also respectively connected to the optical AGC circuit 3, the program-controlled equalization circuit 5, the program-controlled attenuation circuit 6, the display circuit 10, the network management interface circuit 11, and the key circuit 12.

[0025] The input end of the photoelectric conversion circuit 1 is an optical signal input port, which receives the downstream optical signal of the cable TV network, converts the received optical signal into a radio frequency signal of the cable TV, and transmits the converted cable TV radio frequency signal to the first amplifier circuit 2 for amplification processing. The cable TV radio frequency signal after amplification processing is gain controlled by the optical AGC circuit 3, and the processed cable TV radio frequency signal is transmitted to the second amplifier circuit 4 for amplification processing. The cable TV radio frequency signal after amplification processing is equalized and attenuated by the program-controlled equalization circuit 5 and the program-controlled attenuation circuit 6 in turn, and the processed cable TV radio frequency signal is transmitted to the third amplifier circuit 7 and the fourth amplifier circuit 8 in turn for amplification processing, and the output end of the fourth amplifier circuit 8 is a radio frequency signal output port, which is used to output the downstream radio frequency signal of the cable TV network.

[0026] The photoelectric conversion circuit 1 also transmits the converted cable TV RF signal to the microprocessor circuit 9. The microprocessor circuit 9 controls the optical AGC circuit 3, the programmable equalization circuit 5, and the programmable attenuation circuit 6 according to the received cable TV RF signal. In addition, the microprocessor circuit 9 is also used to control the display circuit 10, the network management interface circuit 11, and the key circuit 12.

[0027] The photoelectric conversion circuit 1 adopts a photoelectric tube of Xiamen Bailai Company, model ZBLPD-PFA1-75AR, a coaxial small package, and has the characteristics of high responsiveness, low dark current and return loss.

[0028] The first amplifier circuit 2 uses a low noise coefficient amplifier chip of Shenzhen Vanward Technology, model SG110, with an operating frequency range of 50-1200MHz and a chip gain of 20dB.

[0029] The optical AGC circuit 3 adopts the digital programmable RF attenuation chip of Shanghai Anqiwei Company, model ARW621A, with an operating frequency range of 1-6000MHz and a step attenuation of 0.5dB. According to the size of the optical power input to the optical receiver, the attenuation is controlled through the serial port of the microprocessor circuit 9. The smaller the received optical power, the smaller the attenuation, and the larger the received optical power, the larger the attenuation. Thus, when the input optical power is within the range of -9-+2dBm, the RF output signal of the optical AGC circuit remains unchanged.

[0030] The second amplifier circuit 4 and the third amplifier circuit 7 both use the low noise coefficient and high linearity amplifier chip of Shenzhen Vanward Technology, model SG101, with an operating frequency range of 50-1200MHz and a chip gain of 16dB.

[0031] The programmable equalization circuit 5 is composed of a digital programmable RF attenuation chip and related passive circuits from Shanghai Anqiwei Company. The model of the digital programmable RF attenuation chip is ARW621A, the operating frequency range is 1-6000MHz, the step equalization amount is 0.5dB, and the microprocessor circuit 9 can adjust the equalization amount according to the specific situation, and the adjustment range is 0-20dB.

[0032] The program-controlled attenuation circuit 6 adopts the digital program-controlled RF attenuation chip of Shanghai Anqiwei Company, model ARW621A, the operating frequency range is 1-6000MHz, the step attenuation is 0.5dB, and the microprocessor circuit 9 can adjust the attenuation according to the specific situation, and the adjustment range is 0-20dB.

[0033] The fourth amplifier circuit 8 uses a high linear push-pull amplifier chip from RFHIC, model AE618, with an operating frequency range of 50-1300MHz and a chip gain of 18dB. The maximum RF signal amplitude output after amplification by the fourth amplifier circuit 8 can reach 108dBμV, and the operating frequency range is 45-1218MHz.

[0034] The microprocessor circuit 9 adopts a cost-effective chip of Macrocrystalline Technology, model STC12C5608AD, with 4K EEPROM and 8K Flash.

[0035] The display circuit 10 uses a four-digit 0.28-inch common cathode digital tube produced by Macrovate Optoelectronics Technology.

[0036] The network management interface circuit 11 adopts a high-performance microcontroller chip of MICROCHIP Company, model PIC18F67J60, with 1M Flash, IEEE 802.3 compatible Ethernet controller, integrated MAC and 10Base-T PHY, and 8K bytes of send / receive data packet buffer SRAM.

[0037] The key circuit 12 adopts a 6*6*7.5 touch switch produced by Hongqi Co., Ltd.

[0038] The utility model is a network-managed cable TV corridor optical receiver, which is suitable for cable TV system transmission network, has digital display of input optical power, optical AGC control, digital control and display of attenuation and equalization, RF signal output level display, and can have an Ethernet network management interface to achieve remote monitoring and control. It is convenient for cable TV system transmission network operation and maintenance work, and improves the work efficiency of operation and maintenance personnel.

[0039] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A network-managed cable TV corridor optical receiver, characterized in that: It includes a photoelectric conversion circuit, a first amplifying circuit, an optical AGC circuit, a second amplifying circuit, a program-controlled equalizing circuit, a program-controlled attenuation circuit, a third amplifying circuit, a fourth amplifying circuit, a microprocessor circuit, a display circuit, a network management interface circuit, and a key circuit; The input end of the photoelectric conversion circuit is connected to the optical signal of the cable TV network, the output end of the photoelectric conversion circuit is connected to the input end of the first amplifier circuit, the output end of the first amplifier circuit is connected to the input end of the optical AGC circuit, the output end of the optical AGC circuit is connected to the input end of the second amplifier circuit, the output end of the second amplifier circuit is connected to the input end of the program-controlled equalization circuit, the output end of the program-controlled equalization circuit is connected to the input end of the program-controlled attenuation circuit, the output end of the program-controlled attenuation circuit is connected to the input end of the third amplifier circuit, the output end of the third amplifier circuit is connected to the input end of the fourth amplifier circuit, and the output end of the fourth amplifier circuit is connected to the radio frequency signal of the cable TV network; The output end of the photoelectric conversion circuit is also connected to the microprocessor circuit, and the microprocessor circuit is also respectively connected to the optical AGC circuit, the program-controlled equalization circuit, the program-controlled attenuation circuit, the display circuit, the network management interface circuit, and the key circuit.

2. A network-managed cable TV corridor optical receiver according to claim 1, characterized in that: The model of the photoelectric conversion circuit is ZBLPD-PFA1-75AR.

3. A network-managed cable TV corridor optical receiver according to claim 1, characterized in that: The model used by the first amplifier circuit is SG110.

4. A network-managed cable TV corridor optical receiver according to claim 1, characterized in that: The second amplifier circuit and the third amplifier circuit both use SG101.

5. A network-managed cable TV corridor optical receiver according to claim 1, characterized in that: The model adopted by the fourth amplifier circuit is AE618.

6. A network-managed cable TV corridor optical receiver according to claim 1, characterized in that: The optical AGC circuit, program-controlled equalization circuit, and program-controlled attenuation circuit all adopt the model ARW621A.

7. A network-managed cable TV corridor optical receiver according to claim 1, characterized in that: The model of the microprocessor circuit is STC12C5608AD.

8. The network-managed cable TV corridor optical receiver according to claim 1, characterized in that: The display circuit adopts four 0.28-inch common cathode digital tubes.

9. A network-managed cable TV corridor optical receiver according to claim 1, characterized in that: The model adopted by the network management interface circuit is PIC18F67J60.

10. The network-managed cable TV corridor optical receiver according to claim 1, characterized in that: The key circuit adopts a touch switch.

Images