CN109361455A - A kind of digital optical fiber repeater system and switching method of band backup - Google Patents
A kind of digital optical fiber repeater system and switching method of band backup Download PDFInfo
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- CN109361455A CN109361455A CN201811249711.7A CN201811249711A CN109361455A CN 109361455 A CN109361455 A CN 109361455A CN 201811249711 A CN201811249711 A CN 201811249711A CN 109361455 A CN109361455 A CN 109361455A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- H04B10/038—Arrangements for fault recovery using bypasses
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Abstract
The invention discloses the digital optical fiber direct stations and switching method of a kind of backup of band, main includes a near-end machine and at least one remote termination, multiple key light modules of the near-end machine connect the key light module of corresponding remote termination, multiple standby optical modules of near-end machine connect the standby optical module of corresponding remote termination, are sequentially connected between each remote termination.The near-end machine is mainly made of proximal end master control borad, proximal end IF board and proximal end power module, and remote termination is made of distal end master control borad, distal end IF board, far end supply module and power amplifier module.The present invention uses modularized design, and proximal end IF board, distal end IF board and power amplifier module are stripped out from master control borad, according to requirements, addition or removal modules；By the hardware and software of internal system, instantaneous switching is realized, substantially on user experience without influence；Equipment cost is also reduced simultaneously, design scheme is simplified, improves system reliability.
Description
Technical field
The present invention relates to Repeater Technology field, the digital optical fiber repeater system of mainly a kind of band backup and switching side
Method.
Background technique
Existing digital optical fiber repeater system requires high or harsher environment situation in some applications
Under, need to backup processing；In existing application, current backup be all by increasing a set of or covering identical equipment more, with
Backup functionality is realized in this networking.Although this method is also able to achieve backup networking, this processing mode one side equipment at
This height, another aspect networking is complicated, and to equipment performance itself and site installation test personnel, more stringent requirements are proposed, unfavorable
It is run in extensive gauze, while being also unsatisfactory for the requirement to the green low-power consumption of wireless device at present.As shown in Figure 1, traditional
Active/standby system be made of respectively two sets of equipment, primary link is composed in series by near-end machine 1 and remote termination 1~3, wherein remote termination 3
It is looped back to near-end machine 1 again；Standby link is connected networking by near-end machine 2 with remote termination 4~6, and wherein remote termination 6 is looped back to near-end machine again
2.This networking mode consumes a large amount of equipment cost, simultaneously because number of devices is double, increases difficulty to gauze maintenance
Degree；Due to being two sets of independent networking equipments, can not the active/standby link of fast automatic judgement state, work as primary link failure, need
When being switched to standby link, it is necessary to which manually or triggering standby link is removed on backstage, causes the gauze response time slow, seriously affects line
Net operation and user experience.
Summary of the invention
It is an object of the invention to overcome the shortcomings of the prior art, and the digital fiber for providing a kind of band backup is directly put
System of standing and switching method.
The object of the present invention is achieved by the following technical solutions.A kind of digital optical fiber direct station of band backup, it is main
It to include a near-end machine and at least one remote termination, multiple key light modules of the near-end machine connect corresponding remote termination
Key light module, multiple standby optical modules of near-end machine connect the standby optical module of corresponding remote termination, between each remote termination successively
It is connected；The near-end machine is mainly made of proximal end master control borad, proximal end IF board and proximal end power module, wherein proximal end IF board
Including the main IF board in proximal end and proximal end for IF board；Remote termination is by distal end master control borad, distal end IF board, far end supply module and function
Amplification module is constituted；Wherein distal end IF board includes the main IF board in distal end, distally for IF board, and power amplifier module includes main power amplifier module
With standby power amplifier module；Proximal end master control borad is respectively with the main IF board in proximal end and proximal end for IF board circuit connection, distal end master control borad point
Not with the main IF board in distal end, distally for IF board circuit connection, distal end master control borad is connected by radio frequency line with power amplifier module
And export radiofrequency signal.
The present invention can also further limit and perfect by the following technical programs.
Preferably, the proximal end master control borad uses homologous clock to keep synchronous with proximal end IF board, i.e., closely
The clock source of IF board is held to be provided by the clock chip of proximal end master control borad, the clock source of remote termination is provided by near-end machine, near-end machine
With remote termination use SERDES interface, i.e. high speed serial parallel exchange interface carries out the mode of clock recovery, realizes that optical fiber is synchronous.
Preferably, the data communication of the proximal end master control borad and the active/standby IF board in proximal end uses even-multiple
LVDS sampling.The data communication of optimal embodiment, the proximal end master control borad and the active/standby IF board in proximal end uses 4 times
LVDS sampling.
Preferably, the proximal end power module includes proximal end main power source module and proximal end stand-by power source module, institute
The far end supply module stated includes distal end main power source module and distal end stand-by power source module.
Invention also provides a kind of switching methods of the digital optical fiber direct station of band backup, include the following steps:
(1), after powering on, proximal end master control borad respectively with the main IF board in proximal end, proximal end for IF board send agreement code stream to
Opposite end, when opposite end receives correct code stream, then system thinks that High-Speed Hardware interface works normally, and permission is released to normally
Base-band data stream has real-time interface status information in base-band data stream；
(2), proximal end master control borad carries out switching judging to data stream, that is, receives proximal end according to the interface status information received
(there is error code or intermediate-frequency section device in the high-speed interface work of the main IF board in proximal end when main IF board Interface status works abnormal
Part damage or the main IF board power down in proximal end), then proximal end is automatically switched to for IF board, and the guarantee of poll switching time is less than
800ms is transmitted using proximal end for the signal link of IF board；
(3), when proximal end master control borad is carried out data transmission using optical module, distal end owner is connected using near-end machine key light module
Optical module, near-end machine is for optical module connection remote termination for optical module；When main optical path is obstructed, then standby optical path can be automatically switched to, is cut
Changing the time guarantees within 1000ms；
(4), after powering on, distal end master control borad sent respectively with the main IF board in distal end, distally for IF board the code stream of agreement to
Opposite end, when opposite end receives correct code stream, then system thinks that High-Speed Hardware interface works normally；When the main intermediate frequency plate interface in distal end
Work status is abnormal, then is switched to the standby IF board in distal end in real time, is transmitted using the signal link of the standby IF board in distal end；
(5), radiofrequency signal enters power amplifier module by radio frequency line from distal end master control borad, when main power amplifier module operation irregularity
(i.e. power amplifier power is without output) is output a signal in antenna feeder antenna then by standby power amplifier module.
Technical solution as another mature technology: it when normal work, is powered using proximal end main power source, when proximal end master control
After plate monitors the power alarm from proximal end power module, proximal end stand-by power source is switched to according to pre-defined rule and is worked.Together
Reason when normal work, is powered, when distal end, master control borad monitors the power alarm from far end supply module using distal end main power source
Afterwards, distal end stand-by power source is switched to according to pre-defined rule to work.
Further, bulky capacitor is set in the proximal end power module, main power source and proximal end stand-by power source are cut in proximal end
During changing, proximal end master control borad and proximal end IF board are able to maintain normal work.Similarly, it is arranged in the far end supply module big
Capacitor, in distal end main power source and distal end stand-by power source handoff procedure, distal end master control borad and distal end IF board are able to maintain normal work.
The invention has the benefit that
1. reducing the number of the active/standby link device of tradition, legacy system is compared, the equipment of half is reduced；It reduces and is
System power consumption, reduces equipment network complexity；
2. device integration is higher, using modularized design, active/standby function adaptively switches, and modularized design realizes
System conversion is convenient, while being convenient for search and orientation problem；
3. using modular design, the IF board of equipment and power amplifier module are stripped out from whole plate, according to using
It is required that addition or removal modules, it is ensured that the normal work of other modules increases operability and can safeguard
Property, while reducing the production cost of equipment；
4. using active/standby modularized design, it is ensured that the real-time of active/standby switching, system can detect modules automatically
Working condition, to realize the work of normal module automatically；
5. having gathered Ethernet exchanging ability, the data equipment of any website can be realized any by close/remote equipment
The access of node.
Detailed description of the invention
Fig. 1 is the active/standby system connection schematic diagram of tradition.
Fig. 2 is system connection schematic diagram of the invention.
Fig. 3 is near-end machine system block diagram of the invention.
Fig. 4 is the functional block diagram of proximal end IF board.
Fig. 5 is remote termination system block diagram of the invention.
Fig. 6 is the functional block diagram of distal end IF board.
Fig. 7 is the functional block diagram of power amplifier module.
Specific embodiment
Below in conjunction with attached drawing, the present invention will be described in detail:
As shown in Fig. 2, a kind of digital optical fiber repeater system of band backup, mainly includes a near-end machine and at least one
Remote termination, multiple key light modules of near-end machine connect the key light module of corresponding remote termination, multiple standby optical modules of near-end machine
The standby optical module of corresponding remote termination is connected, is sequentially connected between each remote termination.The present invention uses modularized design, passes through
The hardware and software of internal system realizes instantaneous switching, substantially on user experience without influence；It is excellent by system simultaneously
Change, digital hardware, power amplifier, power module are merged into a set of equipment, active/standby link is carried out without seaming and cutting by software
It changes；The design also reduces equipment cost simultaneously, simplifies design scheme, improves system reliability.And gather in equipment
Ethernet exchanging function can realize the exchanging visit of arbitrary point by equipment.
Fig. 3 show near-end machine system block diagram, and the near-end machine is mainly by proximal end master control borad, proximal end IF board and proximal end
Power module constitute, wherein proximal end master control borad include fpga chip, MCU chip, ethernet switching module, gain module, decaying/
The standby optical module of gain module, 4 key light modules and 4, proximal end IF board includes the main IF board in proximal end and proximal end for IF board, closely
Hold master control borad respectively with the main IF board in proximal end and proximal end for IF board circuit connection.Proximal end power module uses double hot standby modes,
The proximal end power module includes proximal end main power source module and proximal end stand-by power source module.The main IF board in proximal end and proximal end are for intermediate frequency
The IC power input of plate is provided by proximal end master control borad, by the main IF board of proximal end master control borad and proximal end and proximal end between IF board
High speed connector conduction, and support hot plug；MCU chip on the master control borad of proximal end monitors the electricity from proximal end power module
After the alarm of source, backup power source can be switched to according to pre-defined rule and worked, since there are bulky capacitors in the master control borad of proximal end, can protected
Demonstrate,prove short time not power down, therefore in power module handoff procedure, proximal end master control borad with the main IF board in proximal end and proximal end for intermediate frequency
Plate keeps working normally.
The proximal end master control borad and the active/standby IF board in proximal end uses high-speed interface (interface 1a/b, interface 2a/b, interface
It 3a/b) is attached, the clock source of the active/standby IF board in proximal end is provided by the clock chip of proximal end master control borad, it is ensured that is belonged to same
One clock source is just able to maintain synchronization；The data communication of proximal end master control borad and the active/standby IF board in proximal end is sampled using even-multiple LVDS,
It is most preferably using 4 times of LVDS samplings, the difficulty of chip PIN pin capable of reducing using and PCB layout.After powering on, proximal end master control
The active/standby IF board of plate and proximal end sends the code stream of agreement to opposite end, and when opposite end receives correct code stream, then system thinks hardware
High-speed interface works normally, and permission is released to normal base-band data stream, also has real-time interface shape in base-band data stream
State information；Proximal end master control borad can carry out switching judging to data stream, that is, receive in the master of proximal end according to the interface status information received
Frequency plate interface work status is abnormal, then automatically switching to proximal end for IF board, poll switching time guarantees to be less than 800ms,
It is transmitted using proximal end for the signal link of IF board；The handoff procedure has been controlled by the fpga chip in the master control borad of proximal end
At guarantee signal can restore normal in Microsecond grade.
The functional block diagram of the proximal end Fig. 4 IF board, proximal end IF board mainly include fpga chip, D/A chip, A/D chip, filter
Wave device, frequency mixer, attenuator and CLK clock module, wherein fpga chip passes through D/A chip all the way, filter, frequency mixer, declines
Subtract device and be connected by interface 1a/b with proximal end master control borad and constitute the main collection of uplink, fpga chip another way passes through D/A chip, filtering
Device, frequency mixer, attenuator and by interface 2a/b be connected with proximal end master control borad constitute uplink diversity, uplink it is main collects and uplink diversity
Constitute uplink.The interface 3a/b being connected with proximal end master control borad by frequency mixer, attenuator, filter, A/D chip and
Fpga chip, which is connected, constitutes downlink.When normal use, the interface 1a/b of proximal end master control borad, interface 2a/b, interface 3a/b points
Not with the interface 1a/b of the main IF board in proximal end, interface 2a/b, interface 3a/b circuit communication；When switching, the interface of proximal end master control borad
1a/b, interface 2a/b, interface 3a/b are then respectively with proximal end for the interface 1a/b of IF board, interface 2a/b, interface 3a/b circuit company
It is logical.
Fig. 5 show remote termination system block diagram, remote termination by distal end master control borad, distal end IF board, far end supply module and
Power amplifier module is constituted；Distal end master control borad includes fpga chip, MCU chip, ethernet switching module, gain module, low noise mould
The standby optical module of block, 2 key light modules and 2, distal end IF board include the main IF board in distal end, distally for IF board, power amplifier module
Including main power amplifier module and standby power amplifier module；Distal end master control borad respectively with the main IF board in distal end, distally for IF board circuit connection,
Distal end master control borad is connected with power amplifier module by radio frequency line and exports radiofrequency signal, and the far end supply module includes remote
Hold main power source module and distal end stand-by power source module.
When the proximal end master control borad is carried out data transmission using active/standby optical module, default near-end machine key light module connection
Remote termination key light module, near-end machine is for optical module connection remote termination for optical module；When main optical path is obstructed, system can be automatically switched to
Standby optical path, switching time guarantee within 1000ms；As shown in Fig. 3,5, one He of key light module of distal end master control borad in remote termination
Standby optical module one is separately connected any key light module of proximal end and for optical module.The clock source of remote termination is also provided by near-end machine,
Near-end machine and remote termination use SERDES interface, i.e. high speed serial parallel exchange interface carries out the mode of clock recovery, realize optical fiber
It is synchronous, guarantee the low error rate and reliability of data transmission.The clock chip input source of distal end master control borad is by active/standby in remote termination
Optical path recovered clock is reference, and system synchronizes active/standby optical path using poll by the way of, and poll when, which needs to integrate, examines
The synchronization institute elapsed time of worry system, prevents PING-PONG phenomenon.When main optical path is synchronous, when selecting the recovery of main optical path
Clock makes reference, and is otherwise made reference using the recovered clock of standby optical path；Fpga chip in the master control borad of distal end supports double optical port inputs,
The recovered clock real-time monitoring of two paths of signals, the function are combined by the fpga chip in the master control borad of distal end with clock chip CLK real
It is existing.In the remote termination distal end master control borad connect with the active/standby IF board hardware in distal end and working mechanism and near-end machine in proximal end
Master control borad is consistent with the active/standby IF board in proximal end, and so it will not be repeated.
Radiofrequency signal enters power amplifier module by radio frequency line from master control borad distal end master control borad, and the specific connection of power amplifier module is closed
System is as shown in fig. 7, power amplifier module realizes the switching control and output port standing-wave ratio detection function of the amplification of signal, PA power amplifier；
It inputs the switching with output signal and small signal and high power switch control is respectively adopted, two switches are general to control signal all the way, in fact
The synchronism switching of existing signal.Main backup module output switching terminal connects 3dB electric bridge, realizes dual-port input function, every port is examined in real time
Output and reflection power are surveyed, module built-in MCU calculates output port standing-wave ratio in real time.Module externally passes through 485 buses and master control
Plate connection.Power amplifier is by the way of warm back-up, and when main power amplifier module operation irregularity, last hardware selector selects standby power amplifier mould
The signal of block is output in antenna feeder antenna.
Downlink of the present invention: as shown in Figure 3-4, near-end machine couples the radiofrequency signal of RRU, the downlink in the master control borad of proximal end
Radio frequency link TX connects proximal end IF board by radio frequency line, i.e., in the master of proximal end after the effects of combining, decaying, gain are amplified
Frequency plate and proximal end are for IF board；After the mixing of the active/standby IF board in proximal end, gain amplification and intermediate frequency filtering, into A/D chip
Carry out analog-to-digital conversion；The active/standby IF board in proximal end carries out Digital Down Convert processing, after being converted to baseband signal, is led to by high-speed interface
Data are transmitted in the fpga chip of proximal end master control borad by the mode of over-sampling by the active/standby IF board in proximal end；In the master control borad of proximal end
Fpga chip baseband signal is reprocessed, while merging Ethernet exchanging data, be packaged into CPRI agreement, CPRI agreement
By SERDES interface, data and conversion of going here and there, then optical signal is converted electrical signals by optical module and carries out optical fiber transmission；According to
System design, defaults the key light module of the key light module connection remote termination of near-end machine, and the standby optical module of near-end machine connects remote termination
Standby optical module.As seen in figs. 5-6, the fpga chip in the master control borad of distal end recovers serial signal from SERDES interface,
Again by parsing CPRI agreement and logical process, baseband signal to be treated and ethernet signal are recovered；Distal end master control borad
It is attached by high-speed interface and the active/standby IF board in distal end；In the active/standby IF board in distal end, fpga chip is mainly to base band
Signal carries out the processing of Digital Up Convert, and is analog signal by digital signal transition by D/A chip, and by being mixed,
Filtering exports radiofrequency signal, is connect by radio frequency line with distal end master control borad；Master control borad carries out phase by radio frequency line and power amplifier module
Connect and exports radiofrequency signal.Distal end master control borad can be parsed Ethernet data by FPGA, and be exported from Switching Module.
Uplink of the present invention: wireless signal is received by remote termination antenna, and in distal end, master control borad experience low noise, radio frequency increase
After the amplification of the signals such as beneficial device, by entering the active/standby IF board in distal end after radio frequency line；Uplink by lead/diversity constitutes, main/
Diversity link enter the ADC of the active/standby IF board in distal end (when uplink frequency mixer, attenuator, filter, A D chip be collectively referred to as
ADC it works independently before), after the digital to analog conversion of ADC, the fpga chip in the active/standby IF board in distal end carries out number to it
Down-converted, data processing method, design method are consistent with downlink；Distal end master control borad is transmitted to by high-speed interface
In, after the fpga chip in the master control borad of distal end carries out the processing of CPRI framing to baseband signal and ethernet signal, by built-in
SERDES interface simultaneously goes here and there and is sent to key light module after conversion, then is connected to near-end machine by optical fiber；The machine of near-end machine processing uplink
Making the mechanism for handling downlink with it is inverse transformation, is no longer repeated here；And the processing of proximal end master control borad parsing Ethernet data
Mode is consistent with distal end master control borad.
It is understood that it will be understood by those skilled in the art that being subject to technical solution of the present invention and inventive concept
It all should fall within the scope of protection of the appended claims of the present invention with replacement or change.
Claims (8)
1. a kind of digital optical fiber direct station of band backup, it is characterised in that: main includes a near-end machine and at least one distal end
Machine, multiple key light modules of the near-end machine connect the key light module of corresponding remote termination, multiple standby optical modules of near-end machine
The standby optical module of corresponding remote termination is connected, is sequentially connected between each remote termination；The near-end machine is mainly by proximal end master
It controls plate, proximal end IF board and proximal end power module to constitute, wherein proximal end IF board includes the main IF board in proximal end and proximal end for intermediate frequency
Plate；Remote termination is made of distal end master control borad, distal end IF board, far end supply module and power amplifier module；Wherein distal end IF board packet
Include the main IF board in distal end, distally for IF board, power amplifier module includes main power amplifier module and standby power amplifier module；Proximal end master control borad difference
With the main IF board in proximal end and proximal end for IF board circuit connection, distal end master control borad is respectively with the main IF board in distal end, distally for intermediate frequency
Plate circuit connection, distal end master control borad are connected with power amplifier module by radio frequency line and export radiofrequency signal.
2. the digital optical fiber direct station of band according to claim 1 backup, it is characterised in that: the proximal end master control borad and
Proximal end IF board uses homologous clock to keep synchronous, i.e., the clock source of proximal end IF board is mentioned by the clock chip of proximal end master control borad
For the clock source of remote termination is provided by near-end machine, and near-end machine and remote termination use SERDES interface, i.e. high speed serial parallel exchange interface
To carry out the mode of clock recovery, realization optical fiber synchronization.
3. the digital optical fiber direct station of band backup according to claim 1 or 2, it is characterised in that: the proximal end master control
The data communication of plate and the active/standby IF board in proximal end is sampled using even-multiple LVDS.
4. the digital optical fiber direct station of band according to claim 3 backup, it is characterised in that: the proximal end master control borad with
The data communication of the active/standby IF board in proximal end is using 4 times of LVDS samplings.
5. the digital optical fiber direct station of band backup according to claim 1, it is characterised in that: the proximal end power module
Including proximal end main power source module and proximal end stand-by power source module, the far end supply module includes distal end main power source module and distal end
Stand-by power source module.
6. a kind of switching method using the digital optical fiber direct station as described in claim 1 with backup, it is characterised in that: packet
Include following steps:
(1), after powering on, proximal end master control borad sends the code stream of agreement to opposite end for IF board with the main IF board in proximal end, proximal end respectively,
When opposite end receives correct code stream, then system thinks that High-Speed Hardware interface works normally, and permission is released to normal base band
Data flow has real-time interface status information in base-band data stream；
(2), proximal end master control borad carries out switching judging to data stream, that is, receives in the master of proximal end according to the interface status information received
When frequency plate interface work status is abnormal, then proximal end is automatically switched to for IF board, poll switching time guarantees to be less than 800ms,
It is transmitted using proximal end for the signal link of IF board；
(3), when proximal end master control borad is carried out data transmission using optical module, remote termination key light mould is connected using near-end machine key light module
Block, near-end machine is for optical module connection remote termination for optical module；When main optical path is obstructed, then standby optical path can be automatically switched to, when switching
Between guarantee within 1000ms；
(4), after powering on, distal end master control borad sends the code stream of agreement to opposite end with the main IF board in distal end, distally for IF board respectively,
When opposite end receives correct code stream, then system thinks that High-Speed Hardware interface works normally；When the main IF board Interface status in distal end
It works abnormal, is then switched to the standby IF board in distal end in real time, transmitted using the signal link of the standby IF board in distal end；
(5), radiofrequency signal enters power amplifier module by radio frequency line from distal end master control borad, when main power amplifier module operation irregularity, then leads to
It crosses for power amplifier module, outputs a signal in antenna feeder antenna.
7. the switching method of the digital optical fiber direct station of band backup according to claim 6, it is characterised in that: work normally
When, it is powered using proximal end main power source and distal end main power source, when proximal end, master control borad monitors that the power supply from proximal end power module is accused
After police, proximal end stand-by power source is switched to according to pre-defined rule and is worked；When distal end, master control borad is monitored from far end supply module
Power alarm after, distal end stand-by power source is switched to according to pre-defined rule and is worked.
8. the switching method of the digital optical fiber direct station of band backup according to claim 7, it is characterised in that: described is close
Bulky capacitor is set in end power module and far end supply module, main power source and proximal end stand-by power source or distal end main power source and remote in proximal end
It holds in stand-by power source handoff procedure, is able to maintain normal work.
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| CN201811249711.7A CN109361455A (en) | 2018-10-25 | 2018-10-25 | A kind of digital optical fiber repeater system and switching method of band backup |
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| CN201811249711.7A CN109361455A (en) | 2018-10-25 | 2018-10-25 | A kind of digital optical fiber repeater system and switching method of band backup |
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