CN105227252A - The method of measurement of the data feedback channel signal to noise ratio of optical workstation and CMC equipment - Google Patents
The method of measurement of the data feedback channel signal to noise ratio of optical workstation and CMC equipment Download PDFInfo
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- CN105227252A CN105227252A CN201510678704.9A CN201510678704A CN105227252A CN 105227252 A CN105227252 A CN 105227252A CN 201510678704 A CN201510678704 A CN 201510678704A CN 105227252 A CN105227252 A CN 105227252A
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Abstract
Present invention is disclosed the method for measurement of the data feedback channel signal to noise ratio of a kind of optical workstation and CMC equipment, it comprises the steps: step one, the electrically controlled attenuator of other three roads data feedback channels except the data feedback channel of N road of the long-range adjustment optical workstation of remote network management, pad value is adjusted to maximum, and the electrically controlled attenuator pad value of N road data feedback channel remains unchanged; Step 2, remote network management calls the instruction of CMC device interior, the signal to noise ratio of quick search now return path signal, and preserves data, and the signal to noise ratio collected is the signal to noise ratio of N road data feedback channel return path signal; Step 3, the pad value of the fast quick-recovery of remote network management other three roads data feedback channels except the data feedback channel of N road is state before adjustment, and guarantee that user normally uses, this method of measurement embodies easy and simple to handle, can reduce the advantage such as human and material resources, time expenditure.
Description
Technical field
The present invention relates to a kind of broadband and CATV Field, particularly relate to the method for measurement of the data feedback channel signal to noise ratio of a kind of optical workstation and CMC equipment.
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.During the practical application of CMC product must with two-way light work-station with the use of, to realize the repertoire of optical node.
In prior art, the wiring construction block diagram of optical workstation and CMC equipment as shown in Figure 2, the CATV light signal received is converted to radio television signal by optical workstation (O/E), mix with the descending DOCSIS signal that CMC equipment exports, mixed signal divides four tunnels to export by RF port after equilibrium is amplified, and is sent in user family eventually through coaxial cable distribution net network.The return path signal of user side enters interior lights station device by coaxial cable distribution net network by RF port, after filtering, decay after, four tunnel mixed signals enter the up input port of CMC.
Because hfc plant is in the electromagnetic space of an opening, various impulsive noise, RF invasive procedure, the thermal noise of active device, the distortion noise that passive device causes is filled with whole return path with the form converged.Noise jamming can cause channel bit error rate obviously to rise, and reduce channel utilization index, cause network blockage, user surfs the Net slowly.If noise is present in upstream band, the signal to noise ratio of this data feedback channel can obviously decline and even unavailable, and user terminal CM broken string cannot communicate with CMC again.
In Fig. 2, the up input port of CMC is mixed with four road return path signals of hfc plant, and the noise on each road all can affect the signal quality of return path entirety.When return path meets with serious noise problem, attendant needs the signal to noise ratio investigating every paths, location noise p of E.Use CMC built-in command can inquire about the mixed signal to noise ratio of four road return path signals, but the signal to noise ratio on each road cannot be inquired about, so attendant must arrive the noise level of each road return path signal of in-site measurement, concrete method of measurement is: open optical workstation device housings, measure the noise level at four up test port places, tunnel by instrument respectively, converse the signal to noise ratio on four tunnels respectively.Finding after long-term practice, there is following problem in this method of measurement: 1, attendant must carry and variously open the instrument of device housings and the instrument and meter needed for measuring-signal, complicated operation, at substantial manpower, time; 2, open device housings, circuit board is exposed, and mechanically actuated operation improves the failure rate of equipment, brings certain risk to the safe broadcast of TV programme.
Summary of the invention
The object of the invention is to for above-mentioned defect of the prior art, provide a kind of easy and simple to handle, the method for measurement of human and material resources, the optical workstation of time expenditure and the data feedback channel signal to noise ratio of CMC equipment can be reduced.
For achieving the above object, present invention employs following technical scheme: the method for measurement of the data feedback channel signal to noise ratio of a kind of optical workstation and CMC equipment, described optical workstation has four road data feedback channels, be respectively the 1st road data feedback channel, the 2nd road data feedback channel, the 3rd road data feedback channel and the 4th road data feedback channel, this four roads data feedback channel all arranges electrically controlled attenuator; Described optical workstation and described CMC equipment are linked with remote network management by IP data network, and remote network management can to electrically controlled attenuator remote control and regulation; The operating procedure measuring the signal to noise ratio of N road data feedback channel return path signal is:
Step one, the electrically controlled attenuator of other three roads data feedback channels except the data feedback channel of N road of the long-range adjustment optical workstation of remote network management, pad value is adjusted to maximum, and the electrically controlled attenuator pad value of N road data feedback channel remains unchanged;
Step 2, remote network management calls the instruction of CMC device interior, the signal to noise ratio of quick search now return path signal, and preserves data, and the signal to noise ratio collected is the signal to noise ratio of N road data feedback channel return path signal;
Step 3, the pad value of the fast quick-recovery of remote network management other three roads data feedback channels except the data feedback channel of N road is state before adjustment, guarantees that user normally uses.
Compared to prior art, advantage of the present invention is: 1. the data obtained is accurate, reduces the error that external instrument is measured; 2. attendant without the need to carrying implement, instrument and meter to execute-in-place; 3., without the need to opening device shell, reduce the failure risk of uncapping and causing; Comprehensively 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 part line structured flowchart of the method for measurement of the data feedback channel signal to noise ratio of optical workstation of the present invention and CMC equipment.
Fig. 2 is the optical workstation of prior art and the part line structured flowchart of CMC equipment.
Embodiment
Below in conjunction with preferred embodiment and accompanying drawing thereof, technical solution of the present invention is further non-limitingly described in detail.
With reference to Fig. 1, the CATV light signal received is converted to radio television signal by optical workstation 1, mix in signal mixer 3 with the descending DOCSIS signal that the descending delivery outlet of CMC equipment 2 exports, mixed signal divides four tunnels to export by RF port after signal amplifier 4 equilibrium is amplified, and is sent in user family eventually through coaxial cable (not shown) distribution network.The return path signal of user side enters interior lights work station 1 by coaxial cable distribution net network by RF port, after filtering, decay after, four tunnel mixed signals enter the up input port of CMC equipment 2.As seen from the figure, optical workstation has four road data feedback channels, is respectively the 1st road data feedback channel, the 2nd road data feedback channel, the 3rd road data feedback channel and the 4th road data feedback channel, four road data feedback channels are provided with electrically controlled attenuator 5.Optical workstation 1 has network management interface 6, optical workstation 1 is linked by network management interface 6 and IP data network 7, linked by IP data network 7 and remote network management 8, CMC equipment 2 is linked by IP data network 7 and remote network management 8 again, and remote network management 8 can to electrically controlled attenuator 5 remote control and regulation.
The operating procedure measuring the signal to noise ratio of the 1st road data feedback channel return path signal is:
1) electrically controlled attenuator 5 of the 2nd road data feedback channel of the long-range adjustment optical workstation 1 of remote network management 8, the 3rd road data feedback channel and the 4th road data feedback channel, pad value is adjusted to maximum, and the electrically controlled attenuator of the 1st road data feedback channel 5 depreciations that decline remain unchanged;
2) remote network management 8 calls CMC equipment 2 built-in command, the signal to noise ratio of quick search now return path signal, and preserves data, and the signal to noise ratio collected is the signal to noise ratio of the 1st road data feedback channel return path signal;
3) remote network management 8 fast quick-recovery the 2nd road data feedback channel, the 3rd road data feedback channel and the 4th road data feedback channel pad value is state before adjustment, guarantees that user normally uses.
The operating procedure measuring the signal to noise ratio of the 2nd road data feedback channel return path signal is:
1) electrically controlled attenuator 5 of the 1st road data feedback channel of the long-range adjustment optical workstation 1 of remote network management 8, the 3rd road data feedback channel and the 4th road data feedback channel, pad value is adjusted to maximum, and the electrically controlled attenuator of the 2nd road data feedback channel 5 depreciations that decline remain unchanged;
2) remote network management 8 calls CMC equipment 2 built-in command, the signal to noise ratio of quick search now return path signal, and preserves data, and the signal to noise ratio collected is the signal to noise ratio of the 2nd road data feedback channel return path signal;
3) remote network management 8 fast quick-recovery the 1st road data feedback channel, the 3rd road data feedback channel and the 4th road data feedback channel pad value is state before adjustment, guarantees that user normally uses.
The operating procedure measuring the signal to noise ratio of the 3rd road data feedback channel return path signal is:
1) electrically controlled attenuator 5 of the 1st road data feedback channel of the long-range adjustment optical workstation 1 of remote network management 8, the 2nd road data feedback channel and the 4th road data feedback channel, pad value is adjusted to maximum, and the electrically controlled attenuator of the 3rd road data feedback channel 5 depreciations that decline remain unchanged;
2) remote network management 8 calls CMC equipment 2 built-in command, the signal to noise ratio of quick search now return path signal, and preserves data, and the signal to noise ratio collected is the signal to noise ratio of the 3rd road data feedback channel return path signal;
3) remote network management 8 fast quick-recovery the 1st road data feedback channel, the 2nd road data feedback channel and the 4th road data feedback channel pad value is state before adjustment, guarantees that user normally uses.
The operating procedure measuring the signal to noise ratio of the 4th road data feedback channel return path signal is:
1) electrically controlled attenuator 5 of the 1st road data feedback channel of the long-range adjustment optical workstation 1 of remote network management 8, the 2nd road data feedback channel and the 3rd road data feedback channel, pad value is adjusted to maximum, and the electrically controlled attenuator of the 4th road data feedback channel 5 depreciations that decline remain unchanged;
2) remote network management 8 calls CMC equipment 2 built-in command, the signal to noise ratio of quick search now return path signal, and preserves data, and the signal to noise ratio collected is the signal to noise ratio of the 4th road data feedback channel return path signal;
3) remote network management 8 fast quick-recovery the 1st road data feedback channel, the 2nd road data feedback channel and the 3rd road data feedback channel pad value is state before adjustment, guarantees that user normally uses.
More than operate and completed by the electrically controlled attenuator 5 of remote network management 8 pairs of optical workstations 1 and CMC equipment 2 programming Control, unit consuming time level is Millisecond, can not cause service disconnection, and user cannot discover.Therefore there is following advantage: the data obtained is accurate, reduce the error that external instrument is measured; Attendant without the need to carrying implement, instrument and meter to execute-in-place; Without the need to opening device shell, reduce the failure risk of uncapping and causing.Embody easy and simple to handle, human and material resources, time expenditure etc. can be reduced.
It is pointed out that above-mentioned preferred embodiment is only and technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (5)
1. the method for measurement of the data feedback channel signal to noise ratio of an optical workstation and CMC equipment, described optical workstation has four road data feedback channels, be respectively the 1st road data feedback channel, the 2nd road data feedback channel, the 3rd road data feedback channel and the 4th road data feedback channel, it is characterized in that, four road data feedback channels all arrange electrically controlled attenuator; Described optical workstation and described CMC equipment are linked with remote network management by IP data network, and remote network management can to electrically controlled attenuator remote control and regulation; The operating procedure measuring the signal to noise ratio of N road data feedback channel return path signal is:
Step one, the electrically controlled attenuator of other three roads data feedback channels except the data feedback channel of N road of the long-range adjustment optical workstation of remote network management, pad value is adjusted to maximum, and the electrically controlled attenuator pad value of N road data feedback channel remains unchanged;
Step 2, remote network management calls the instruction of CMC device interior, the signal to noise ratio of quick search now return path signal, and preserves data, and the signal to noise ratio collected is the signal to noise ratio of N road data feedback channel return path signal;
Step 3, the pad value of the fast quick-recovery of remote network management other three roads data feedback channels except the data feedback channel of N road is state before adjustment, guarantees that user normally uses.
2. the method for measurement of the data feedback channel signal to noise ratio of optical workstation according to claim 1 and CMC equipment, is characterized in that, the operating procedure measuring the signal to noise ratio of described 1st road data feedback channel return path signal is:
Step one, the electrically controlled attenuator of the 2nd road data feedback channel of the long-range adjustment optical workstation of remote network management, the 3rd road data feedback channel and the 4th road data feedback channel, pad value is adjusted to maximum, and the electrically controlled attenuator pad value of the 1st road data feedback channel remains unchanged;
Step 2, remote network management calls the instruction of CMC device interior, the signal to noise ratio of quick search now return path signal, and preserves data, and the signal to noise ratio collected is the signal to noise ratio of the 1st road data feedback channel return path signal;
Step 3, the fast quick-recovery of remote network management the 2nd road data feedback channel, the 3rd road data feedback channel and the 4th road data feedback channel pad value are state before adjustment, guarantee that user normally uses.
3. the method for measurement of the data feedback channel signal to noise ratio of optical workstation according to claim 1 and CMC equipment, is characterized in that, the operating procedure measuring the signal to noise ratio of described 2nd road data feedback channel return path signal is:
Step one, the electrically controlled attenuator of the 1st road data feedback channel of the long-range adjustment optical workstation of remote network management, the 3rd road data feedback channel and the 4th road data feedback channel, pad value is adjusted to maximum, and the electrically controlled attenuator pad value of the 2nd road data feedback channel remains unchanged;
Step 2, remote network management calls the instruction of CMC device interior, the signal to noise ratio of quick search now return path signal, and preserves data, and the signal to noise ratio collected is the signal to noise ratio of the 2nd road data feedback channel return path signal;
Step 3, the fast quick-recovery of remote network management the 1st road data feedback channel, the 3rd road data feedback channel and the 4th road data feedback channel pad value are state before adjustment, guarantee that user normally uses.
4. the method for measurement of the data feedback channel signal to noise ratio of optical workstation according to claim 1 and CMC equipment, is characterized in that, the operating procedure measuring the signal to noise ratio of described 3rd road data feedback channel return path signal is:
Step one, the electrically controlled attenuator of the 1st road data feedback channel of the long-range adjustment optical workstation of remote network management, the 2nd road data feedback channel and the 4th road data feedback channel, pad value is adjusted to maximum, and the electrically controlled attenuator pad value of the 3rd road data feedback channel remains unchanged;
Step 2, remote network management calls the instruction of CMC device interior, the signal to noise ratio of quick search now return path signal, and preserves data, and the signal to noise ratio collected is the signal to noise ratio of the 3rd road data feedback channel return path signal;
Step 3, the fast quick-recovery of remote network management the 1st road data feedback channel, the 2nd road data feedback channel and the 4th road data feedback channel pad value are state before adjustment, guarantee that user normally uses.
5. the method for measurement of the data feedback channel signal to noise ratio of optical workstation according to claim 1 and CMC equipment, is characterized in that, the operating procedure measuring the signal to noise ratio of described 4th road data feedback channel return path signal is:
Step one, the electrically controlled attenuator of the 1st road data feedback channel of the long-range adjustment optical workstation of remote network management, the 2nd road data feedback channel and the 3rd road data feedback channel, pad value is adjusted to maximum, and the electrically controlled attenuator pad value of the 4th road data feedback channel remains unchanged;
Step 2, remote network management calls the instruction of CMC device interior, the signal to noise ratio of quick search now return path signal, and preserves data, and the signal to noise ratio collected is the signal to noise ratio of the 4th road data feedback channel return path signal;
Step 3, the fast quick-recovery of remote network management the 1st road data feedback channel, the 2nd road data feedback channel and the 3rd road data feedback channel pad value are state before adjustment, guarantee that user normally uses.
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| CN101056446A (en) * | 2006-04-11 | 2007-10-17 | 大唐移动通信设备有限公司 | An automatic test method and device of the radio resource management performance |
| CN101808257A (en) * | 2010-02-26 | 2010-08-18 | 北京邮电大学 | Method and device for optimizing dynamic transmission performance in wavelength switched optical network |
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