CN205081877U - Down signal of CMC and CATV radiofrequency signal hybrid circuit in light workstation - Google Patents
Down signal of CMC and CATV radiofrequency signal hybrid circuit in light workstation Download PDFInfo
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- CN205081877U CN205081877U CN201520811404.9U CN201520811404U CN205081877U CN 205081877 U CN205081877 U CN 205081877U CN 201520811404 U CN201520811404 U CN 201520811404U CN 205081877 U CN205081877 U CN 205081877U
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Abstract
The utility model discloses a down signal of CMC and CATV forward radiofrequency signal hybrid circuit in the cable television light workstation, including the down signal output part of CMC, the just phototropic receive radio frequency signal output part of CATV, radiofrequency signal blender and radio -frequency amplification distribution module, the radiofrequency signal blender includes multiple entry end and output all the way, and CATV forward light -receiving radiofrequency signal output and radiofrequency signal blender are wherein gone the same way the input and be connected, and the output and the input of radio -frequency amplification distribution module of radiofrequency signal blender are connected, the circuit still includes the adjustable attenuator, the down signal output part of CMC is connected with the input of this adjustable attenuator, the output of this adjustable attenuator and another way input of radiofrequency signal blender is connected. This circuit possesses easy and simple to handlely, advantages such as reducible manpower, material resources, time expenditure.
Description
Technical field
The utility model relates to broadband and CATV Field, particularly relates to CMC downstream signal and CATV radiofrequency signal hybrid circuit in optical workstation.
Background technology
The fast development of the communication technology and broadcast television technique, makes the transition of cable television network forward Next generation broadcasting network.Along with business development, user has higher requirement to cable TV network quality and bearing capacity, and cable TV network needs to carry out digitlization and bidirectional transformation.C-DOCSIS is the broadband access technology of a new generation based on cable TV network (CATV), large bandwidth can be realized register one's residence, integrated service such as carrying video, voice-and-data etc., effectively can solve the bandwidth bottleneck problem of broadcasting and TV access, meet the demand of user to the integration of three networks.In C-DOCSIS system architecture, CMC equipment, as C-DOCSIS head end, connects Coaxial distribution network network and aggregation networks, is responsible for the data retransmission between them, by configuration-system and the network management system of aggregation networks access carrier.
When adopting the hybrid fiber coax (HFC) of C-DOCSIS technology to cable TV to carry out bidirectional rebuilding, usually by the optical node place of CMC deployed with devices in hfc plant, after the CATV light signal received is converted to radio television signal by the optical workstation in optical node, mix with the descending DOCSIS signal that CMC equipment exports, amplify through radio frequency again and distribute, be sent in user family eventually through coaxial cable distribution net network by radiofrequency signal, its circuit structure as shown in Figure 1.In practice, usually do unified configuration before CMC deployed with devices, output level is fixed value and higher than CATV signal level (if Fig. 3, B level point value is higher than in A).For ensureing the safe broadcast of TV programme and the normal use of user CM, before the TV signal mixing that forward light-receiving RF signal output in the downstream signal of CMC and optical workstation exports, the level numerical value of the downstream signal of CMC must be adjusted to and maintain an equal level mutually with TV signal.At present, adjust the CMC downlink signal levels before mixing by the descending delivery outlet level of configuration CMC equipment, concrete grammar is: use computer log CMC equipment, directly adjusts the descending delivery outlet level of CMC.But which exists following problem: 1, need use computer, and operating personnel must possess the managerial ability of CMC equipment; The level value of 2, different optical workstations is variant, and when CMC deployed with devices quantity is more, adjustment CMC descending level workload is large.
Utility model content
The purpose of this utility model is for above-mentioned defect of the prior art, provides a kind of easy and simple to handle, CMC downstream signal and CATV radiofrequency signal hybrid circuit in the optical workstation that can reduce human and material resources, time expenditure.
For realizing above-mentioned utility model object, the utility model have employed following technical scheme: CMC downstream signal and CATV forward radiofrequency signal hybrid circuit in a kind of optical workstation, comprise CMC downstream signal output, CATV forward light-receiving RF signal output, radiofrequency signal blender and radio frequency amplify distribution module, described radiofrequency signal blender comprises multi-channel rf input and a road radio frequency exports, CATV forward light-receiving radiofrequency signal outputs to a radiofrequency signal blender wherein road input, CMC downstream signal outputs to the input of adjustable attenuator, the output of adjustable attenuator is connected with another road input of radiofrequency signal blender.The output of radiofrequency signal blender is amplified distribution module with radio frequency and is connected.
Compared to prior art, advantage of the present utility model is: circuit of the present utility model exports at optical workstation CMC downstream signal to be increased adjustable attenuator and realize operating personnel and only need adjust attenuator with regard to adjustable CMC downlink signal levels between radiofrequency signal blender input, to overcome the defect that need adjust output level complicated operation with computer log CMC equipment, reduce the level of skill requirement to operating personnel, embody easy and simple to handle, the advantage such as human and material resources, time expenditure can be reduced.
Accompanying drawing explanation
Fig. 1 is the structural representation of CMC downstream signal of the present utility model and CATV radiofrequency signal hybrid circuit.
Fig. 2 is the topological diagram of CMC downstream signal of the present utility model and CATV radiofrequency signal hybrid circuit.
Fig. 3 is the CMC downstream signal of prior art and the topological diagram of CATV radiofrequency signal hybrid circuit.
Embodiment
Below in conjunction with preferred embodiment and accompanying drawing thereof, technical solutions of the utility model are further non-limitingly described in detail.
Shown in seeing figures.1.and.2, circuit of the present utility model comprises CMC downstream signal output 1, CATV forward light-receiving RF signal output 2, adjustable attenuator 3, radiofrequency signal blender 4, radio frequency amplification distribution module, wherein, CMC is a kind of access network equipment, CATV is cable TV forward signal, radiofrequency signal blender 4 comprises multi-channel input and a road output, and radio frequency amplifies distribution module 5 and comprises input and output.
During connection, CMC downstream signal output 1 is connected with the mutual circuit of the input of adjustable attenuator 3, the output of adjustable attenuator 3 is connected with a wherein road input of radiofrequency signal blender 4, CATV forward light-receiving RF signal output 2 is connected with another road input of radiofrequency signal blender 4, the input that output and the radiofrequency signal of radiofrequency signal blender 4 amplify distribution module 5 is connected, and the output that radio frequency amplifies distribution module 5 is connected with cable of cable TV distribution network.
In circuit of the present utility model, an adjustable attenuator 3 is increased between CMC downstream signal output 1 and the circuit of signal mixer 4, the effect of this adjustable attenuator 3 regulates electrical signal intensity (level), after CMC downstream signal enters adjustable attenuator 3, regulate the pad value of adjustable attenuator 3, CMC downlink signal levels value can be reduced.As shown in Figure 2, the level value of CMC downstream signal is 105dB μ V, the level value of CATV radiofrequency signal is 88dB μ V, after CMC downstream signal enters adjustable attenuator 3, regulate the pad value of adjustable attenuator 3, make the CMC signal level value of output be 88dB μ V, namely maintain an equal level with CATV level of RF signals, at this moment, CMC downstream signal can mix with CATV radiofrequency signal.
In sum, circuit of the present utility model increases adjustable attenuator and realizes adjustment CMC downlink signal levels before optical workstation signal mixer, without the need to logging in the defect of CMC equipment adjustment output level, easy and simple to handle, can reduce human and material resources, time expenditure.
It is to be noted; above-mentioned preferred embodiment is only and technical conceive of the present utility model and feature is described; its object is to person skilled in the art can be understood content of the present utility model and implement according to this, protection range of the present utility model can not be limited with this.All equivalences done according to the utility model Spirit Essence change or modify, and all should be encompassed within protection range of the present utility model.
Claims (1)
1. CMC downstream signal and CATV radiofrequency signal hybrid circuit in an optical workstation, it is characterized in that: comprise CMC downstream signal output, CATV forward light-receiving RF signal output, radiofrequency signal blender and radio frequency amplify distribution module, described radiofrequency signal blender comprises multi-channel input and a road output, CATV forward light-receiving RF signal output and radiofrequency signal blender wherein a road input are connected, the input that output and the radio frequency of radiofrequency signal blender amplify distribution module is connected, described circuit also comprises adjustable attenuator, described CMC downstream signal output is connected with the input of this adjustable attenuator, the output of this adjustable attenuator is connected with another road input of described radiofrequency signal blender.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520811404.9U CN205081877U (en) | 2015-10-19 | 2015-10-19 | Down signal of CMC and CATV radiofrequency signal hybrid circuit in light workstation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520811404.9U CN205081877U (en) | 2015-10-19 | 2015-10-19 | Down signal of CMC and CATV radiofrequency signal hybrid circuit in light workstation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205081877U true CN205081877U (en) | 2016-03-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201520811404.9U Active CN205081877U (en) | 2015-10-19 | 2015-10-19 | Down signal of CMC and CATV radiofrequency signal hybrid circuit in light workstation |
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| Country | Link |
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| CN (1) | CN205081877U (en) |
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2015
- 2015-10-19 CN CN201520811404.9U patent/CN205081877U/en active Active
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