CN202268965U

CN202268965U - Upgrading of cable television amplifier to Ethernet coaxial cable transmission local side optical receiver circuit

Info

Publication number: CN202268965U
Application number: CN2011204121539U
Authority: CN
Inventors: 陈鑫; 范金良; 储志风; 王晓吉
Original assignee: CHANGSHU GAOSHIDA OPTOELECTRONIC TECHNOLOGY Co Ltd
Current assignee: CHANGSHU GAOSHIDA OPTOELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2011-10-26
Filing date: 2011-10-26
Publication date: 2012-06-06
Anticipated expiration: 2021-10-26

Abstract

The utility model discloses upgrading of a cable television amplifier to an Ethernet coaxial cable transmission local side optical receiver circuit, belonging to the technical field of cable televisions. The cable television amplifier comprises capacitors C1-C13 and C16-C26, electrolytic capacitors C14 and C15, resistors R1-R11, inductors L1-L9, discharge tubes D1-D4, diodes D5-D7, wiring ports INPUT, OUT1, OUT2, AC60VIN, -20dB/in and-20dB/OUT, radio frequency bases J1 and J2, signal couplers Z1-Z5, a duplex filter FLT1, attenuators EQ1, EQ2, ATT1 and ATT2, electrified extension sockets CP1-CP3, sockets CZ1 and CZ2, plugs CT1 and CT2, radio frequency connection lines JP1 and JP2, a switch power supply U3, amplification modules U1 and U2, an optical receiving module and an EOC (Ethernet Over cable) local side module, wherein the U1 is a MC-7831 amplification module of the NEC company, and the U2 is the MC-7884S gallium arsenide module of the NEC company. The cable television amplifier has the advantages of being usable and upgradable, having wide coverage, low cost and high bandwidth.

Description

Wired TV amplifier upgrades to ethernet coaxial cable transmission local side optical receiver circuit

Technical field

The utility model relates to a kind of wired TV amplifier and upgrades to ethernet coaxial cable transmission (EOC; Ethernet Over Coax) local side optical receiver circuit; Belong to the cable TV technical field, especially the transformation of hybrid fiber coax bilateral network is a kind of based on cable TV transmitted in both directions equipment

Background technology

cable TV (CATV; Cable Television) through the development of decades; Arrived the development key stage at present, along with the development of business, digitlization, fiberize and transmitted in both directions technology etc. progressively incorporate in the cable television network.For better development, increase new service function, pursue new growth engines, thereby more and more higher to the requirement of transmission network, the transformation of network is extremely urgent.In this case; Hybrid fiber coax (HFC; Hybrid Fiber Coax) as a kind of broadband access network, more and more demonstrates its distinctive advantage: extremely wide transmission band, abundant frequency resource, insert means and relatively low technical cost easily.Therefore, develop the integral telecommunication business through cable TV, promptly cable TV network is except transmitting TV programme, and also possessing functions such as online, data transmission, video request program, household's IT application is the development trend of cable TV network.

year; Along with carrying out and NGB (NextGenerationBroadcasting of State Council's integration of three networks; Be called for short broadcasting and television network of future generation) proposition; Utilize existing cable television digitalization and Mobile Multimedia Broadcasting to be the basic technology platform; Under " high performance wideband information network " core technology supports; With the integration of three networks is the national generation information infrastructure NGB television network broadcast of essential characteristic; Can satisfy the integration of three networks; The specification requirement of wire and wireless combination and full process and full network; High definition stream media transmits and other high bandwidth business provide the guarantee on the bandwidth for broadcasting and TV are carried out; Digital TV in high resolution can be provided; The service of high-speed data access and voice call is promptly implemented the "Three-in-One Network"; But also have the service guarantee and management characteristic that enjoy a good reputation simultaneously, can satisfy the general requirement and the strategic objective of national information networking in the following many decades.Requirement according to SARFT(The State Administration of Radio and Television) " light advances copper and moves back "; The transformation of HFC bilateral network realizes Fiber-To-The-Building basically; Realize that progressively Fiber to the home; This trend just need utilize the amplifiers that use in a large number in cable TV operator's the hfc plant to upgrade to EOC local side optical receiver, and equipment performance can satisfy the requirement of network upgrade in following 5-10

Summary of the invention

The purpose of the utility model is to provide a kind of wired TV amplifier to upgrade to EOC local side optical receiver circuit, it have can utilization and upgradability, cover wide, cost is low and bandwidth is high.

The purpose of the utility model reaches like this; A kind of wired TV amplifier upgrades to ethernet coaxial cable transmission local side optical receiver circuit; Comprise capacitor C 1-C13; C16-C28; Electrochemical capacitor C14; C15; Resistance R 1-R11; Inductance L 1-L9; Discharge tube D1-D4; Diode D5-D7; Wiring port IN PUT; OUT1; OUT2; AC60V IN;-20dB/IN;-20dB/OUT; Radio frequency seat J1; J2; Signal coupler Z1-Z5; Duplexer filter FLT1; Attenuator EQ1; EQ2; ATT1; ATT2; Cross electric socket CP1-CP3; Socket CZ1; CZ2; Plug CT1; CT2; Radio frequency connecting line JP1; JP2; Switching Power Supply U3; Amplification module U1; U2; Optical Receivers; EOC local side module; Wherein U1 is the MC-7831 of a NEC Corporation amplification module; U2 is the MC-7884S of a NEC Corporation GaAs module; Binding post IN PUT connects capacitor C 16; Discharge tube D1; One end of inductance L 1; The other end ground connection of discharge tube D1; Another termination capacitor C 19 of inductance L 1; Cross the end of electric socket CP1; The other end ground connection of capacitor C 19; Another termination radio frequency seat J1 one end of capacitor C 16; Signal coupler Z1 primary input end; Signal coupler Z1 centre cap ground connection; The input connecting resistance R4 of signal coupler Z1 branch; The end of R5; The other end ground connection of resistance R 5; The end of the other end connecting resistance R6 of resistance R 4; Binding post-20dB/IN; The other end ground connection of resistance R 6; The end of the output connecting resistance R1 of signal coupler branch; The other end ground connection of resistance R 1, signal coupler Z1 master exports termination signal coupler Z4 input; One end of inductance L 7, signal coupler Z4 centre cap connects inductance L 6; One end of capacitor C 4; Attenuator EQ1 grounding leg; Inductance L 6; The other end ground connection of capacitor C 4; One end of another termination capacitor C 5 of inductance L 7, signal coupler Z4 output termination attenuator EQ1 input, the other end of attenuator EQ1 output termination capacitor C 5; Attenuator ATT1 input; Attenuator ATT1 grounding leg ground connection; One end of attenuator ATT1 output termination capacitor C 1,1 pin of another termination amplification module U1 of capacitor C 1,2 of amplification module U1; 3; 6; 7 pin ground connection; 5 pin of amplification module U1 connect capacitor C 9; One end of inductance L 4; The other end ground connection of capacitor C 9, the other end of inductance L 4; One termination direct voltage+24V of capacitor C 8, the other end ground connection of capacitor C 8; 9 pin of amplification module U1 connect signal coupler Z5 input; One end of inductance L 9; Signal coupler Z5 centre cap connects inductance L 8; One end of capacitor C 6; Attenuator EQ2 grounding leg, inductance L 8; The other end ground connection of capacitor C 6, signal coupler Z5 output termination attenuator EQ2 input; One end of another termination capacitor C 7 of inductance L 9; The other end of attenuator EQ2 output termination capacitor C 7; Attenuator ATT2 input, attenuator ATT2 grounding leg ground connection, an end of attenuator ATT2 output termination capacitor C 2; 1 pin of another termination amplification module U2 of capacitor C 2; 2 of amplification module U2; 3; 6; 7 pin ground connection, 5 pin of amplification module U2 connect capacitor C 11; One end of inductance L 5, the other end ground connection of capacitor C 11; The other end of inductance L 5; One termination direct voltage+24V of capacitor C 10; The other end ground connection of capacitor C 10, the end of the 9 pin connecting resistance R10 of amplification module U2; The high go side of duplexer filter FLT1, the low pass termination radio frequency seat J2 of duplexer filter FLT1; Another terminating diode D6 negative pole of resistance R 10; Diode D7 is anodal; Diode D6 is anodal; Diode D7 minus earth, duplexer filter FLT1 mixes 1 pin of termination signal coupler Z3, the 2 pin ground connection of signal coupler Z3; Signal coupler Z3 centre cap connects an end of capacitor C 3; The other end ground connection of capacitor C 3, the end of the 3 pin connecting resistance R3 of signal coupler Z3; Signal coupler Z2 primary input end, signal coupler Z2 centre cap ground connection; The input connecting resistance R7 of signal coupler Z2 branch; The end of R8; The other end ground connection of resistance R 8, the end of the other end connecting resistance R9 of resistance R 7; Binding post-20dB/OUT, the other end ground connection of resistance R 9; The end of the output connecting resistance R2 of signal coupler Z2 branch; The other end ground connection of resistance R 2, signal coupler Z2 master exports an end of termination capacitor C 17, another termination discharge tube D2 of capacitor C 17; One end of inductance L 2; Binding post OUT1; Discharge tube D2 other end ground connection; Another termination capacitor C 21 of inductance L 2; Cross the end of electric socket CP2, the other end ground connection of capacitor C 21, the other end of the 4 pin connecting resistance R3 of signal coupler Z3; One end of capacitor C 18; Another termination discharge tube D3 of capacitor C 18; One end of inductance L 3; Binding post OUT2; Discharge tube D3 other end ground connection, another termination capacitor C 23 of inductance L 3; Cross the end of electric socket CP3, the other end ground connection of capacitor C 23; Binding post AC60V IN meets discharge tube D4; One end of capacitor C 27; Cross the electric socket CP3 other end; Capacitor C 25; The end of C26; Cross the electric socket CP2 other end; Capacitor C 22; The end of C28; Capacitor C 24; The end of C20; Cross the electric socket CP1 other end; 1 pin of Switching Power Supply U3; Discharge tube D4; Capacitor C 27; C26; C25; C28; C22; C24; The other end of C20; The 2 pin ground connection of Switching Power Supply U3,3 pin of Switching Power Supply U3; 1 pin of socket CZ1; Capacitor C 12; One end of resistance R 11; Electrochemical capacitor C14 positive pole meets direct voltage+24V, the other end of capacitor C 12; Electrochemical capacitor C14 minus earth; Another terminating diode D5 of resistance R 11 is anodal; Diode D5 minus earth, 2 pin of the 4 pin combination hub CZ1 of Switching Power Supply U3; 1 pin of socket CZ2; One end of capacitor C 13; Electrochemical capacitor C15 is anodal, capacitor C 13 other ends; Electrochemical capacitor C15 negative pole; 3 of socket CZ1; 4 pin; The 2 pin ground connection of socket CZ2; In the time will upgrading to optical receiver; Optical Receivers plug CT1 gang socket CZ1, radio frequency connecting line JP1 connect radio frequency seat J1, in the time will upgrading to EOC ground connection optical receiver; EOC local side module plug CT2 gang socket CZ2, radio frequency connecting line JP2 connect radio frequency seat J2.

the utility model makes full use of the amplifier on original cable TV network; Upgrade to optical receiver; When the EOC service needed is arranged, upgrade to EOC local side optical receiver again, and equipment performance can satisfy the requirement of network upgrade in following 5-10.Equipment after the upgrading can make full use of coaxial cable, branch distributor resource on the existing network simultaneously, the construction of need not registering one's residence, and construction volume significantly reduces, and transformation speed is fast.Have fast wide the covering and characteristics cheaply, make full use of the legacy network resource, the current network of need not upgrading can cover the user in whole sub-district or building as long as single-point is just installed.According to actual conditions, only the area that demand is arranged is installed, do not need disposable deployed with devices to be put in place, each household networking cost is equivalent to about 50% of present telecommunications ADSL broadband, and bandwidth is 10 times of ADSL, is enough to satisfy the business demand of following several years.Ustomer premises access equipment can roll and drops into along with user's increase, can install as required, invest, and recovery of the capital has very strong predictable.

Description of drawings

Fig. 1 is the schematic diagram of the utility model.

Embodiment

the utility model is that a kind of wired TV amplifier upgrades to EOC local side optical receiver circuit; Comprise that wired TV RF signals inserts IN PUT interface; Intensity and slope according to the cable TV signal of importing are adjusted signal through preceding level equaliser and attenuator, export to the preamplifying circuit module; Signal after the output of prime amplification module is amplified is adjusted signal according to the cable TV signal designing requirement of hybrid fiber coax through inter-stage equalizer and attenuator, outputs to the final stage amplification module; The high go side of the signal input duplexer filter after the final stage amplification module output amplification, duplexer filter are mixed end output signal and are passed through OUT1, OUT2 interface to the HFC cable distribution network; Wiring port is prevented surge, anti-thunderbolt protection and is crossed circuit; AC60V input port, signal input port and signal output port are designed with anti-surge, anti-thunderbolt protection and cross circuit, and electric designing requirement selects the corresponding electric mortiser sheet of crossing to carry out electrical transmission according to the mistake of hybrid fiber coax; Power circuit; AC60V voltage through Switching Power Supply output to constant direct current+24V ,+12V voltage gives amplification module, optical receiver module and EOC local side module for power supply through filter circuit and dc inductance, accomplishes wired TV amplifier and upgrade to EOC local side optical receiver.

are referring to figure: it is that the cable TV radiofrequency signal inserts IN PUT interface that wired TV amplifier upgrades to EOC local side optical receiver circuit; Intensity and slope according to the cable TV signal of importing are adjusted signal through preceding level equaliser and attenuator, export to the preamplifying circuit module; Signal after the output of prime amplification module is amplified is adjusted signal according to the cable TV signal designing requirement of hybrid fiber coax through inter-stage equalizer and attenuator, outputs to the final stage amplification module; The high go side of the signal input duplexer filter after the final stage amplification module output amplification, duplexer filter are mixed end output signal and are passed through OUT1, OUT2 interface to the HFC cable distribution network.AC60V input port, signal input port and signal output port are designed with anti-surge, anti-thunderbolt protection and cross circuit, and electric designing requirement selects the corresponding electric mortiser sheet of crossing to carry out electrical transmission according to the mistake of hybrid fiber coax; Power circuit; AC60V voltage through the constant direct current+24V of Switching Power Supply output ,+12V voltage gives amplification module, optical receiver module and EOC local side module for power supply through filter circuit and dc inductance, accomplishes wired TV amplifier and upgrade to EOC local side optical receiver.Cable TV signal inserts binding post IN PUT; Through the radio frequency input prime adjustment circuit of forming by radio frequency seat J1, signal coupler Z1, Z4, capacitor C 1, C4, C16, attenuator EQ1, ATT1, inductance L 6, L7; Through the intensity and the slope of attenuator EQ1, ATT1 adjustment input signal, be input to 1 pin of amplification module U1; Signal coupler Z1, resistance R 1, R4-R6, binding post-20dB/IN form the input signal observation circuit, the intensity and the slope of monitoring input signal; Direct voltage+24V, capacitor C 8, C9, inductance L 4 are formed power supply circuits and are driven amplification module U1, amplification module U1 work; Export the inter-stage adjustment circuit of signal behind the 9 pin amplifying signals of amplification module U1, adjust the intensity of signal and 1 pin that slope (regulating according to network design requirement) arrives amplification module U2 through attenuator EQ2, ATT2 through forming by coupler Z5, inductance L 8, L9, capacitor C 2, C7, attenuator EQ2, ATT2; Direct voltage+24V, capacitor C 10, C11, inductance L 5 are formed power supply circuits and are driven amplification module U2, amplification module U2 work; Resistance R 10, diode D6, D7 form the protective circuit of amplification module U2, prevent pulse current, static intrusion, damage amplification module U2; The distributor circuit of output signal through being made up of duplexer filter FLT1, signal coupler Z3, Z2, resistance R 3, capacitor C 3, C17, C18, binding post OUT1, OUT2 exported signal to the HFC cable distribution network by binding post OUT1, OUT2 behind the 9 pin amplifying signals of amplification module U2.Signal coupler Z2, resistance R 2, R7-R9, binding post-20dB/OUT form monitor signal output circuit, the intensity of monitoring output signal and slope; By binding post AC60V IN, discharge tube D1-D4, inductance L 1-L3, cross electric socket CP1-CP3, capacitor C 19-C28 forms anti-surge, anti-thunderbolt protection and crosses circuit, electric designing requirement selects corresponding electric mortiser sheet to carry out electrical transmission according to the mistake of hybrid fiber coax; Form DC-voltage supply circuit and power indicating circuit by Switching Power Supply U3, socket CZ1, CZ2, capacitor C 12-C15, resistance R 11, diode D5, AC60V voltage through the constant direct current+24V of Switching Power Supply output ,+12V voltage gives amplification module, optical receiver module and EOC local side module for power supply through filter circuit and dc inductance; In the time will upgrading to optical receiver, the plug CT1 of Optical Receivers inserts socket CZ1, Optical Receivers work, and Optical Receivers radio frequency connecting line inserts radio frequency seat J1, removes binding post IN PUT input signal, and upgrading is accomplished; In the time will upgrading to EOC local side optical receiver; The plug CT2 of EOC local side module inserts socket CZ2; The work of EOC local side module; EOC local side module radio frequency connecting line inserts radio frequency seat J2; Through duplexer filter FLT1 low go side input; Mix the end outputting data signals to the HFC cable distribution network by duplexer filter, accomplish the upgrading of EOC local side optical receiver.IN OUT wherein; OUT1; OUT2; AC60V IN is the binding post of joint made in Great Britain;-20dB/IN;-20dB/OUT is the binding post of metric system F head; J1; J2 is the gold-plated radio frequency seat of 75 Ω impedances; JP1; JP2 is gold-plated radio frequency connecting line of being with of 75 Ω impedances; CT1 is the 1X4 core plug; CT2 is the 1X2 core plug; CZ1 is the 1X4 socket; CZ2 is the 1X2 socket; U1 is the MC-7831 of a NEC Corporation amplification module; U2 is the MC-7884S of a NEC Corporation GaAs amplification module; U3 is a Switching Power Supply; FLT1 is 35/47 frequency division duplex filter; D1-D4 is a discharge tube; D5 is the emitting red light diode; D6-D7 is the 1N4148 diode; CP1-CP3 is that vertical AC60V crosses electric socket; EQ1; EQ2; ATT1; ATT2 is an attenuator made in Great Britain; L1-L3 was for exchanging inductance; L4-L5 crosses inductance for the direct current high frequency; L6-L9 is an air core inductor, C1; C2 is the high frequency capacitance, and C3 is an impedance matching electric capacity; C4-C7 is concussion electric capacity; C8-C13 is a high-frequency filter capacitor, C14; C15 is an electrochemical capacitor, and C16-C18 is that high pressure resistant high frequency is at a distance from exchanging Leaded Ceramic Disc Capacitor; C19-C25 is high pressure resistant high-frequency ac filtering Leaded Ceramic Disc Capacitor; C26-C28 is high pressure resistant high-frequency ac filtering electric capacity of the dacron, R1; R2 is an impedance matching resistance, and R3 is high isolation resistance; R4-R9 is a damping resistance; R10 is a current-limiting resistance, and Optical Receivers transfers the modular assembly of the signal of telecommunication to for the light signal of band light AGC (automatic gain control) function, and EOC local side module is that data-modulated is the modular assembly of radiofrequency signal output.

It is to make full use of the original amplifier of hfc plant that wired TV amplifier upgrades to the most attractive benefit of EOC local side optical receiver circuit; Save network rebuilding cost, and equipment performance can satisfy the requirement of network upgrade in following 5-10.When disposing solution, its following points technical advantage:

1. can utilize, upgradability: along with the continuous extension of optical node, the optical receiver consumption in the hfc plant constantly increases, and original amplifier is eliminated a large amount of.For making full use of original amplifier, scalable through online increase Optical Receivers is optical receiver, and smooth upgrade is an EOC local side optical receiver when the EOC service needed is arranged.

. the utilizability of network: the equipment after the upgrading can make full use of coaxial cable, the branch distributor resource on the existing network, the construction of need not registering one's residence, construction volume significantly reduces, and transformation speed is fast.

are wide to be covered and low-cost characteristics: make full use of the legacy network resource, the current network of need not upgrading is as long as the single-point installation just can cover the user in whole sub-district or building.According to actual conditions, only the area that demand is arranged is installed, do not need disposable deployed with devices to be put in place, each household networking cost is equivalent to about 50% of present telecommunications ADSL broadband.

high bandwidth: bandwidth is 10 times of ADSL, is enough to satisfy the business demand of following several years.Ustomer premises access equipment can roll and drops into along with user's increase, can install as required, invest, and recovery of the capital has very strong predictable

Claims

1. A kind of wired TV amplifier upgrades to ethernet coaxial cable transmission local side optical receiver circuit; It is characterized in that comprising capacitor C 1-C13; C16-C28; Electrochemical capacitor C14; C15; Resistance R 1-R11; Inductance L 1-L9; Discharge tube D1-D4; Diode D5-D7; Wiring port IN PUT; OUT1; OUT2; AC60V IN;-20dB/IN;-20dB/OUT; Radio frequency seat J1; J2; Signal coupler Z1-Z5; Duplexer filter FLT1; Attenuator EQ1; EQ2; ATT1; ATT2; Cross electric socket CP1-CP3; Socket CZ1; CZ2; Plug CT1; CT2; Radio frequency connecting line JP1; JP2; Switching Power Supply U3; Amplification module U1; U2; Optical Receivers; EOC local side module; Wherein U1 is the MC-7831 of a NEC Corporation amplification module; U2 is the MC-7884S of a NEC Corporation GaAs module; Binding post IN PUT connects capacitor C 16; Discharge tube D1; One end of inductance L 1; The other end ground connection of discharge tube D1; Another termination capacitor C 19 of inductance L 1; Cross the end of electric socket CP1; The other end ground connection of capacitor C 19; Another termination radio frequency seat J1 one end of capacitor C 16; Signal coupler Z1 primary input end; Signal coupler Z1 centre cap ground connection; The input connecting resistance R4 of signal coupler Z1 branch; The end of R5; The other end ground connection of resistance R 5; The end of the other end connecting resistance R6 of resistance R 4; Binding post-20dB/IN; The other end ground connection of resistance R 6; The end of the output connecting resistance R1 of signal coupler branch; The other end ground connection of resistance R 1; Signal coupler Z1 master exports termination signal coupler Z4 input; One end of inductance L 7; Signal coupler Z4 centre cap connects inductance L 6; One end of capacitor C 4; Attenuator EQ1 grounding leg, inductance L 6; The other end ground connection of capacitor C 4, an end of another termination capacitor C 5 of inductance L 7; Signal coupler Z4 output termination attenuator EQ1 input; The other end of attenuator EQ1 output termination capacitor C 5; Attenuator ATT1 input, attenuator ATT1 grounding leg ground connection, an end of attenuator ATT1 output termination capacitor C 1; 1 pin of another termination amplification module U1 of capacitor C 1; 2 of amplification module U1; 3; 6; 7 pin ground connection, 5 pin of amplification module U1 connect capacitor C 9; One end of inductance L 4, the other end ground connection of capacitor C 9; The other end of inductance L 4; One termination direct voltage+24V of capacitor C 8; The other end ground connection of capacitor C 8,9 pin of amplification module U1 connect signal coupler Z5 input; One end of inductance L 9, signal coupler Z5 centre cap connects inductance L 8; One end of capacitor C 6; Attenuator EQ2 grounding leg; Inductance L 8; The other end ground connection of capacitor C 6; Signal coupler Z5 output termination attenuator EQ2 input, an end of another termination capacitor C 7 of inductance L 9, the other end of attenuator EQ2 output termination capacitor C 7; Attenuator ATT2 input; Attenuator ATT2 grounding leg ground connection; One end of attenuator ATT2 output termination capacitor C 2,1 pin of another termination amplification module U2 of capacitor C 2,2 of amplification module U2; 3; 6; 7 pin ground connection; 5 pin of amplification module U2 connect capacitor C 11; One end of inductance L 5; The other end ground connection of capacitor C 11, the other end of inductance L 5; One termination direct voltage+24V of capacitor C 10, the other end ground connection of capacitor C 10; The end of the 9 pin connecting resistance R10 of amplification module U2; The high go side of duplexer filter FLT1; The low pass termination radio frequency seat J2 of duplexer filter FLT1, another terminating diode D6 negative pole of resistance R 10; Diode D7 is anodal, and diode D6 is anodal; Diode D7 minus earth; Duplexer filter FLT1 mixes 1 pin of termination signal coupler Z3; The 2 pin ground connection of signal coupler Z3, signal coupler Z3 centre cap connects an end of capacitor C 3, the other end ground connection of capacitor C 3; The end of the 3 pin connecting resistance R3 of signal coupler Z3; Signal coupler Z2 primary input end; Signal coupler Z2 centre cap ground connection, the input connecting resistance R7 of signal coupler Z2 branch; The end of R8, the other end ground connection of resistance R 8; The end of the other end connecting resistance R9 of resistance R 7; Binding post-20dB/OUT; The other end ground connection of resistance R 9, the end of the output connecting resistance R2 of signal coupler Z2 branch, the other end ground connection of resistance R 2; Signal coupler Z2 master exports an end of termination capacitor C 17; Another termination discharge tube D2 of capacitor C 17; One end of inductance L 2; Binding post OUT1, discharge tube D2 other end ground connection, another termination capacitor C 21 of inductance L 2; Cross the end of electric socket CP2; The other end ground connection of capacitor C 21; The other end of the 4 pin connecting resistance R3 of signal coupler Z3; One end of capacitor C 18, another termination discharge tube D3 of capacitor C 18; One end of inductance L 3; Binding post OUT2, discharge tube D3 other end ground connection; Another termination capacitor C 23 of inductance L 3; Cross the end of electric socket CP3; The other end ground connection of capacitor C 23, binding post AC60V IN meets discharge tube D4; One end of capacitor C 27; Cross the electric socket CP3 other end; Capacitor C 25; The end of C26; Cross the electric socket CP2 other end; Capacitor C 22; The end of C28; Capacitor C 24; The end of C20; Cross the electric socket CP1 other end; 1 pin of Switching Power Supply U3, discharge tube D4; Capacitor C 27; C26; C25; C28; C22; C24; The other end of C20; The 2 pin ground connection of Switching Power Supply U3; 3 pin of Switching Power Supply U3; 1 pin of socket CZ1; Capacitor C 12; One end of resistance R 11; Electrochemical capacitor C14 positive pole meets direct voltage+24V; The other end of capacitor C 12; Electrochemical capacitor C14 minus earth, another terminating diode D5 of resistance R 11 is anodal, diode D5 minus earth; 2 pin of the 4 pin combination hub CZ1 of Switching Power Supply U3; 1 pin of socket CZ2; One end of capacitor C 13; Electrochemical capacitor C15 is anodal; Capacitor C 13 other ends; Electrochemical capacitor C15 negative pole; 3 of socket CZ1; 4 pin; The 2 pin ground connection of socket CZ2, in the time will upgrading to optical receiver, Optical Receivers plug CT1 gang socket CZ1; Radio frequency connecting line JP1 connects radio frequency seat J1; In the time will upgrading to EOC ground connection optical receiver, EOC local side module plug CT2 gang socket CZ2, radio frequency connecting line JP2 connect radio frequency seat J2