CN101969346B - Digital optical repeater with loop protection and implementation method - Google Patents
Digital optical repeater with loop protection and implementation method Download PDFInfo
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- CN101969346B CN101969346B CN201010522025.XA CN201010522025A CN101969346B CN 101969346 B CN101969346 B CN 101969346B CN 201010522025 A CN201010522025 A CN 201010522025A CN 101969346 B CN101969346 B CN 101969346B
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Abstract
The invention discloses a digital optical repeater with loop protection and an implementation method. The digital optical repeater is composed of near-end machines and far-end machines, wherein a near-end machine is connected with a plurality of far-end machines; the far-end machines use a one-connected-multi-machine cascade connection mode, the farthest far-end machine in a link-type networking architecture is connected with the near-end machines by an added backup loop fiber; and when a middle link is interrupted, a signal channel is switched to the backup loop fiber for transmission. The invention has the beneficial effect of ensuring the normal transmission of the link and the stability and reliability of the link switch for the digital fiber repeater through designing the priority of the two ports of the far-end machines of the digital fiber repeater, and defining a reference switch label signal ref_clk_sel, a farthest far-end machine bit zone is_last and a link stability label is_link_stab; and the process of the link switch is automatically finished by a field programmed gate array (FPGA) program, thus having very simple and effective implementation.
Description
Technical field
The present invention relates to mobile communications network to cover and optimization field, mainly a kind of digital optical fiber direct station with Loop Protection and implementation method.
Background technology
Along with the development of China's mobile communication cause, covering and the optimization of wireless network show its importance day by day.Direct discharging station is the covering of wireless network and a part indispensable in optimizing.The covering of repeater generally has several form: outdoor repeater station, comprises wireless discharging-directly station, optical fiber repeater, frequency-shift repeater; Indoor repeater, also claims indoor distributed system, comprises radio frequency and optical fiber transmission technique.
Digital optical fiber direct station have employed the mode of digital fiber to carry out the transmission of mobile communication signal, has made that the RF of mobile communication has covered again one many flexibly, Larger Dynamic and jumbo system.Digital optical fiber direct station is by near-end machine, remote termination two kinds of equipment compositions, to be near-end machine to be coupled base station sector signals by radio frequency interface for the downlink operation principle of system, through duplexer, simulated frequency conversion, analog-to-digital conversion (ADC), Digital Down Convert (DDC), the I/Q signal of base band and control signal adopt the laggard row electro-optic conversion of CPRI agreement framing, digital optical signal by Optical Fiber Transmission to far-end unit, far-end unit is through opto-electronic conversion, CPRI agreement solution frame, Digital Up Convert (DUC), digital-to-analogue conversion (DAC), simulated frequency conversion laggard enter radio-frequency power amplifier, last high-power RF signal delivers to antenna-feedback system.Digital light wire system up link: comprise main collection and receive and diversity reception two passages, adopt and descending same processing procedure.
Fig. 1 is digital optical fiber repeater system schematic diagram.This system includes proximal device and remote equipment, system down link: near-end unit to be coupled base station sector signals by radio frequency interface, electro-optic conversion is carried out after duplexer, simulated frequency conversion, analog-to-digital conversion (ADC), Digital Down Convert (DDC), digital optical signal by Optical Fiber Transmission to far-end unit, far-end unit through opto-electronic conversion, Digital Up Convert (DUC), digital-to-analogue conversion (DAC), simulated frequency conversion laggard enter radio-frequency power amplifier, last high-power RF signal delivers to antenna-feedback system.Digital fiber system up-link: comprise main collection and receive and diversity reception two passages, adopt and descending same processing procedure.
The networking mode of digital optical fiber direct station has hub-and-spoke configuration, chain structure, ring type structure and hybrid architecture.The shortcoming that chain structure one is very large once network failure (this is difficult to be avoided, the equipment of the middle one-level of such as chain structure breaks down or the reason such as the fiber break that links), network will interrupt, and the ring type structure of digital optical fiber direct station has stronger self-healing function.So-called self-healing refers to that digital optical fiber direct station automatically carries out link switching when network one section of fiber break at short notice without the need to human intervention network, makes the digital optical fiber direct station network ability that restoring signal covers from fault automatically.
Summary of the invention
Object of the present invention will overcome the deficiency of above-mentioned technology just; and a kind of digital optical fiber direct station with Loop Protection and implementation method are provided, what implement very is simple, the normal switching of the loop that can ensure; and the reliability switched, ensure the correct transmission of signal.
The present invention solves the technical scheme that its technical problem adopts: the digital optical fiber direct station of this band Loop Protection; digital optical fiber direct station is made up of near-end machine and remote termination two kinds of equipment; a near-end machine connects multiple stage remote termination; remote termination adopts one to drag many cascade types of attachment; increase a loop backup optical fiber at the remote termination farthest of chain networking to be connected with near-end machine; when interrupting appears in intermediate line link, signal path is switched to loop backup optical fiber and uploads defeated.
Described near-end machine and remote termination, remote termination and remote termination are all pass through Fiber connection.The reference clock of near-end machine is provided by TCXO (Temperature Compensate X ' tal (crystal) Oscillator), remote termination be from optical fiber high-speed serial data recover clock division after as a reference.
Described cascade type of attachment is: digital optical fiber direct station remote termination has two ports, is used for connecting near-end machine or link is A port near that port definition of remote termination of near-end machine, is used for dragging the port definition of next stage remote termination to be B port.
The implementation method of the digital optical fiber direct station of band Loop Protection of the present invention, step is as follows:
(1), define a signal ref_clk_sel with reference to switching mark, A port and the B port working of remote termination are still specified from port mode by signal ref_clk_sel in master port pattern, and the priority of A port is higher than B port;
(1.1), when the value of signal ref_clk_sel is 0, the A port working of remote termination is in master port pattern, B port working is from port mode, the flow direction of repeater downstream signal be all the master port Received signal strength of distally machine then by passing to next stage remote termination from port, the flow direction and the downstream signal of upward signal are reverse;
(1.2), the A port of remote termination, B port all can not synchronously time, the value of signal ref_clk_sel with two seconds for the cycle switches between 1 and 0;
(1.3), the A port of remote termination, B port have one or two can synchronously time, only have B port can receive the value of the Loop Protection flag bit that near-end machine issues and A port can not receive time, B port working at master port pattern, A port working from port mode; During other situations A port be master port, B port for from port, this priority just embodying A port is higher than B port.
(2), carry out the judgement which rank of remote termination is distalmost end, being connected with near-end machine from port of that remote termination of normal distalmost end when running, do not need to follow that the remote termination of intergrade is the same is transmitted to near-end machine again downstream signal;
(3) the stable judgement of link, is carried out, when link stable operation time, comprise link and normally to run or after link normally switches, the just normal transmission of commencing signal, when interrupting appears in intermediate line link, signal path is switched to loop backup optical fiber and uploads defeated.
As preferably, the remote termination decision method of distalmost end is: the flag bit is_last defining a remote termination farthest, according to flag bit is_last, remote termination decides that descending signal is wanted to continue down to forward, up signal whether will with DDC after signal and road after up forward, the decision condition of remote termination is farthest:
If a. remote termination B port can not synchronously time (CPRI protocol frame is synchronous), be just judged to be that current far-end is exactly distalmost end;
B. near-end machine transmits a flag bit downwards by the self-defined word inside CPRI protocol integrated test system word, the master port of every grade of remote termination can solve the value of this flag bit, then by being handed down to next stage remote termination again from port, if the value that can receive this flag bit from port of remote termination, be then judged to be distalmost end.
As preferably; the determination methods that link is stable: define the flag bit is_link_stab that a link is stable; if the master port of remote termination can both stablize the value solving Loop Protection flag bit inside CPRI agreement within two seconds; so the value of is_link_stab is set to 1; represent that link is stablized, otherwise the value of is_link_stab is set to 0, represents that link is unstable; if link is unstable, the digital signal that link transmits is zero.
The effect that the present invention is useful is: the method by the priority of designation number optical fiber repeater far-end machine two ports, definition with reference to switching mark signal ref_clk_sel, define the stable flag bit is_link_stab of remote termination flag bit is_last and link farthest and ensure stability, reliability that the normal transmission of digital optical fiber direct station link and loop switch.The process that loop switches is completed automatically by FPGA program, and what implement very is simple and efficient.
Accompanying drawing explanation
Fig. 1 is the digital optical fiber repeater system schematic diagram of prior art;
Fig. 2 is digital optical fiber direct station ring-shaped network schematic diagram of the present invention;
Fig. 3 is the uplink and downlink signals flow graph of loop proper communication of the present invention;
Fig. 4 is the uplink and downlink signals flow graph after loop of the present invention switches.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 2 is digital optical fiber direct station ring-shaped network schematic diagram, digital optical fiber direct station is made up of near-end machine and remote termination two kinds of equipment, a near-end machine connects four remote terminations, remote termination adopts one to drag many cascade types of attachment, increase a loop backup optical fiber at the remote termination farthest of chain networking to be connected with near-end machine, when interrupting appears in intermediate line link, signal path is switched to loop backup optical fiber and uploads defeated.
Described near-end machine and remote termination, remote termination and remote termination are all pass through Fiber connection.Described cascade type of attachment is: digital optical fiber direct station remote termination has two ports, is used for connecting near-end machine or link is A port near that port definition of remote termination of near-end machine, is used for dragging the port definition of next stage remote termination to be B port.
The implementation method of the digital optical fiber direct station of this band Loop Protection of the present invention, concrete steps are as follows:
(1), in order to make link steady operation, and the normal switching of loop, first we need the priority of specifying A port, B port: the priority of A port is higher than B port.Define a signal ref_clk_sel with reference to switching mark, A port and the B port working of remote termination are still specified from port mode by signal ref_clk_sel in master port pattern;
(1.1) when, machine just powers on, when the value of signal ref_clk_sel is 0, the A port working of remote termination is in master port pattern, B port working is from port mode, the flow direction of repeater downstream signal be all the master port Received signal strength of distally machine then by passing to next stage remote termination from port, the flow direction and the downstream signal of upward signal are reverse;
(1.2), the A port of remote termination, B port all can not synchronously time (CPRI protocol synchronization), the value of signal ref_clk_sel with two seconds for the cycle switches between 1 and 0;
(1.3) if A port, B port have one or two can be synchronous.Near-end machine FPGA program transmits a Loop Protection flag bit downwards by a self-defined word of manufacturer inside CPRI protocol integrated test system word, and the value of such as Loop Protection flag bit is 55.If the value that A port, B port only have B port can solve this flag bit inside CPRI agreement is 55, so the value of ref_clk_sel is 1, and not so the value of ref_clk_sel is 0.The switch condition of the value of ref_clk_sel is not all making a decision all the time, but adopts judge once each second, if not may occur that the value of ref_clk_sel enters endless loop in conversion always.As Fig. 2: when link normally works, the value that the A port of remote termination 1 can receive the Loop Protection flag bit that near-end machine A port hands down is 55, the Loop Protection flag bit that the B port of remote termination 1 can receive A mouth passes to the A port of remote termination 2, and one-level level is transmitted downwards; And the value that the B port of remote termination 4 also can receive the Loop Protection flag bit that near-end machine B port hands down is 55; the Loop Protection flag bit that the A port of remote termination 4 can receive B port passes to the B port of remote termination 3; one-level level is upwards transmitted; so the value that A, B port of far-end can receive Loop Protection flag bit is 55; according to the switch condition of the value of ref_clk_sel above, when link normally runs, the value of the ref_clk_sel of every grade of far-end is all 0.Now suppose that interrupting appears in the optical fiber between remote termination 2 and 3, so the value of the Loop Protection flag bit of the A port of remote termination 3 is just 00, according to the switch condition of the value of ref_clk_sel above, the value of the ref_clk_sel of remote termination 3 is all just configured to 1, the value of the flag bit of the A port of corresponding remote termination 4 is that the B port of distally machine 3 passes and comes, and the flag bit that the B port of remote termination 3 passes is the value of the flag bit of the A port of remote termination 3, so the value of the Loop Protection flag bit of the A port of remote termination 4 is also 00, and the Loop Protection flag bit of the B port of remote termination 4 still can receive near-end machine B port passes the value 55 of coming so the switch condition of value according to ref_clk_sel above, the value of the ref_clk_sel of remote termination 4 is all also configured to 1.Remote termination 3 and remote termination 4 are completed switching, and link just completes the function that loop switches.
(2), carry out the judgement which rank of remote termination is distalmost end, being connected with near-end machine from port of that remote termination of normal distalmost end when running, do not need to follow that the remote termination of intergrade is the same is transmitted to near-end machine again downstream signal;
The remote termination decision method of distalmost end is: the FPGA application definition flag bit is_last of a remote termination farthest, according to is_last, remote termination decides that descending signal is wanted to continue down to forward, up signal whether will with DDC after signal and road after up forward, ensure the normal transmission of signal chains.The decision condition of remote termination is farthest:
If c. remote termination B port can not synchronously time (CPRI protocol frame is synchronous) be just judged to be that current far-end is exactly distalmost end.
D. near-end machine FPGA program transmits a flag bit downwards by a self-defined word of manufacturer inside CPRI protocol integrated test system word, and the value of such as flag bit is 66.Every grade of far-end the master port value that can solve this flag bit be 66, then by being handed down to next stage far-end again from port.So the master port of every grade of remote termination can receive the flag bit that value is 66, and only have distalmost end to receive from port the value that the near-end machine that is attached thereto issues be the flag bit of 66.If so far-end from port can receive value be 66 flag bit be also judged to be distalmost end.
(3) the stable judgement of link, is carried out, when link stable operation time, comprise link and normally to run or after link normally switches, the just normal transmission of commencing signal, when interrupting appears in intermediate line link, signal path is switched to loop backup optical fiber and uploads defeated.
The determination methods that link is stable: FPGA program also defines the stable flag bit is_link_stab of a link; if it is 55 that the master port of remote termination can both stablize the value solving Loop Protection flag bit inside CPRI agreement within two seconds; so the value of is_link_stab is set to 1; represent that link is stablized; otherwise the value of is_link_stab is set to 0, represent that link is unstable.If link is unstable, the digital signal that link transmits is zero, ensure that link transfers wrong digital signal and causes burning the problems such as power amplifier in the processes such as startup or switching.
In addition to the implementation, all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of application claims.
Claims (3)
1. an implementation method for the digital optical fiber direct station with Loop Protection, is characterized in that:
(1) a signal ref_clk_sel with reference to switching mark, is defined, digital optical fiber direct station remote termination has two ports, be used for connecting near-end machine or that port definition of remote termination connected near near-end machine is A port, be used for dragging the port definition of next stage remote termination to be B port; A port and the B port working of remote termination are still specified from port mode by signal ref_clk_sel in master port pattern, and the priority of A port is higher than B port;
(1.1), when the value of signal ref_clk_sel is 0, the A port working of remote termination is in master port pattern, B port working is from port mode, the flow direction of repeater downstream signal be all the master port Received signal strength of distally machine then by passing to next stage remote termination from port, the flow direction and the downstream signal of upward signal are reverse;
(1.2), the CPRI protocol frame of the A port of remote termination, B port all can not synchronously time, the value of signal ref_clk_sel with two seconds for the cycle switches between 1 and 0;
(1.3), the A port of remote termination, the CPRI protocol frame of B port have one or two can synchronously time, only have B port can receive the value of the Loop Protection flag bit that near-end machine issues and A port can not receive time, B port working at master port pattern, A port working from port mode; Near-end machine FPGA program transmits a Loop Protection flag bit downwards by a self-defined word of manufacturer inside CPRI protocol integrated test system word, if A port, B port only have B port can solve the value of described Loop Protection flag bit inside CPRI agreement, so the value of ref_clk_sel is 1, and not so the value of ref_clk_sel is 0; The switch condition of the value of ref_clk_sel adopts judge once each second, arranges the value with reference to switching mark by the comparison of Loop Protection flag bit;
(2), carry out the judgement which rank of remote termination is distalmost end, being connected with near-end machine from port of that remote termination of normal distalmost end when running, do not need to follow that the remote termination of intergrade is the same is transmitted to near-end machine again downstream signal;
(3), carry out the stable judgement of link, when link stable operation time, comprise link and normally to run or after link normally switches, the just normal transmission of commencing signal; When interrupting appears in intermediate line link, signal path is switched to loop backup optical fiber and uploads defeated.
2. the implementation method of the digital optical fiber direct station of band Loop Protection according to claim 1; it is characterized in that: the remote termination decision method of distalmost end is: the flag bit is_last defining a remote termination farthest; according to flag bit is_last, remote termination decides that descending signal is wanted to continue down to forward, up signal whether will with Digital Down Convert DDC after signal close road after up forward, the decision condition of remote termination is farthest:
If a. the B port of remote termination CPRI protocol frame can not synchronously time, be just judged to be that current far-end is exactly distalmost end;
B. near-end machine transmits a flag bit downwards by the self-defined word inside CPRI protocol integrated test system word, the master port of every grade of remote termination can solve the value of this flag bit, then by being handed down to next stage remote termination again from port, if the value that can receive this flag bit from port of remote termination, be then judged to be distalmost end.
3. the implementation method of the digital optical fiber direct station of band Loop Protection according to claim 1; it is characterized in that: the determination methods that link is stable: define the flag bit is_link_stab that a link is stable; if the master port of remote termination can both stablize the value solving Loop Protection flag bit inside CPRI agreement within two seconds; so the value of is_link_stab is set to 1; represent that link is stablized; otherwise the value of is_link_stab is set to 0; represent that link is unstable; if link is unstable, the digital signal that link transmits is zero.
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| CN201010522025.XA CN101969346B (en) | 2010-10-26 | 2010-10-26 | Digital optical repeater with loop protection and implementation method |
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| CN201010522025.XA CN101969346B (en) | 2010-10-26 | 2010-10-26 | Digital optical repeater with loop protection and implementation method |
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| CN107437950A (en) * | 2017-08-04 | 2017-12-05 | 杭州长泽科技有限公司 | A kind of tunnel fm broadcast signal numeral covering scheme and implementation method |
| CN109361455A (en) * | 2018-10-25 | 2019-02-19 | 三维通信股份有限公司 | A kind of digital optical fiber repeater system and switching method of band backup |
| CN111934841B (en) * | 2020-09-23 | 2021-01-22 | 三维通信股份有限公司 | Method and device for determining reference clock, system, storage medium and electronic device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6496290B1 (en) * | 1998-01-31 | 2002-12-17 | Lg Telecom, Inc. | Optic repeater system for extending coverage |
| CN201185422Y (en) * | 2008-04-09 | 2009-01-21 | 北京邦讯技术有限公司 | TD-SCDMA fiber-optical straightly-discharging station |
| CN201341240Y (en) * | 2008-12-30 | 2009-11-04 | 珠海银邮光电技术发展股份有限公司 | Loop guard repeater system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6496290B1 (en) * | 1998-01-31 | 2002-12-17 | Lg Telecom, Inc. | Optic repeater system for extending coverage |
| CN201185422Y (en) * | 2008-04-09 | 2009-01-21 | 北京邦讯技术有限公司 | TD-SCDMA fiber-optical straightly-discharging station |
| CN201341240Y (en) * | 2008-12-30 | 2009-11-04 | 珠海银邮光电技术发展股份有限公司 | Loop guard repeater system |
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