CN1140083C - Passive light network transmission system and its delay control method - Google Patents
Passive light network transmission system and its delay control method Download PDFInfo
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- CN1140083C CN1140083C CNB001197959A CN00119795A CN1140083C CN 1140083 C CN1140083 C CN 1140083C CN B001197959 A CNB001197959 A CN B001197959A CN 00119795 A CN00119795 A CN 00119795A CN 1140083 C CN1140083 C CN 1140083C
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Abstract
The present invention discloses a passive optical fiber network transmission system based on a time division multiple address technique, and a time delay control method thereof. Local end equipment PONC generates burst time slot positioning signals according to positioning signals of a system. Burst time slot signals of far end equipment PONR are detected, and the relative distance of a positioning origin point of the system and burst time slots of the far end equipment PONR is given. The positioning time delay length of the system of the far end equipment PONR is obtained by the relative distance of the burst time slots of the far end equipment PONR. The sending time of the burst time slot signals is adjusted by the far end equipment PONR by the positioning time delay length of the system, and the collision of the burst time slot signals is avoided.
Description
The invention belongs to fiber optic communication field, be specifically related to passive light network transmission system (Passive OpticalNetwork, be called for short PON) and delay control method, more particularly, relate to a kind of EPON system for transmitting and delay control method thereof based on time division multiple access access technology (TDMA).
In the prior art, typical delay control method has following three kinds:
First kind as described in United States Patent (USP) 5341365 and 5469440, and the absolute time delay control algolithm based on the TDMA technology is adopted in time delay control.The upstream multi-frame is made of time delay control frame (HEAD) and valid data frame (BF).The time delay control frame is used for delay testing, after remote equipment PONR receives the delay testing order, remote equipment PONR sends a delay testing pulse train in the time delay control frame, local side apparatus PONC determines the loop time-delay of this remote equipment PONR by detecting this delay testing pulse train, avoids the valid data frame of remote equipment PONR to clash by remote equipment PONR being carried out compensation of delay.In this time delay control algolithm, the control procedure that needs to set up a complexity between local side apparatus PONC and the remote equipment PONR, because long circuit structure complexity and the system reliability of causing of multi-frame length lowers, multi-frame length also can propose restriction to transmission range simultaneously.
Second kind as described in the United States Patent (USP) 5299044, and the carrier wave time delay control algolithm based on the TDMA technology is adopted in time delay control.The upstream multi-frame only is made of the valid data frame, and time delay control is undertaken by a low frequency signal that is modulated on the valid data frame.In this time delay control algolithm, owing to introduce low-frequency modulation signal, inevitably introduce the modulation and demodulation process, signal processing is very complicated, realizes that difficulty is bigger.
The third is as described in the Chinese patent 98113186, and the control algolithm in relative time delay based on the TDMA technology is adopted in time delay control.The upstream multi-frame is made of the valid data frame, and time delay control is undertaken by the frame head of valid data frame.In this time delay control algolithm, because distance measuring signal flows between local side apparatus PONC and remote equipment PONR, and obtain relative loop time-delay by local side apparatus PONC and remote equipment PONR control delay counter, so need to set up the control procedure of a complexity between local side apparatus PONC and the remote equipment PONR, the lower and implementation procedure more complicated of system reliability.
The purpose of this invention is to provide a kind of passive light network transmission system and delay control method thereof based on the time division multiple access access technology, with the adaptability of assurance system to time delay, thereby make delay control method function coverage rate wider, improve the reliability of system, realize simpler.
The present invention realizes so a kind of passive light network transmission system based on the TDMA access technology:
Described system comprises a PON local side apparatus (PONC), optical fiber distributing net (ODN), PON remote equipment (PONR) and PON System Management Unit (PSU);
(PONC) carries out time division multiplexing with input signal by the PON local side apparatus, and the signal of telecommunication after multiplexing is modulated to light signal, this downstream signal is assigned to each PON remote equipment (PONR) by optical fiber distributing net (ODN), and PON remote equipment (PONR) comes out the Signal Separation of this PONR by tap;
PON remote equipment (PONR) is with the input signal multiple connection that happens suddenly, and the burst time slot signal of telecommunication after the multiple connection is modulated to light signal, the burst time slot signal of all PON remote equipments (PONR) carries out the allos light signal by ODN and synthesizes, give each PON local side apparatus (PONC) with the upward signal after synthetic, PON local side apparatus (PONC) comes out the Signal Separation of these all PON remote equipments (PONR) by the burst tap;
In order to carry out avoiding the burst luminous signal of different PON remote equipments (PONR) to clash when the allos light signal synthesizes at ODN, the time delay of PON remote equipment (PONR) burst luminous signal need be controlled, and the time delay controlled function realizes by system's location delay controller that PON System Management Unit (PSU) is controlled this PONR.
In the aforesaid system; send to the upward signal of local side apparatus (PONC) by remote equipment (PONR); its multi-frame structure is made of valid data frame (BF#Ts); each valid data frame is made up of expense and letter sign indicating number; for fear of the collision of valid data frame (BF#Ts), must leave necessary protection between the valid data frame (BF#Ts) at interval.
The PON local side apparatus (PONC) of aforesaid passive light network transmission system comprises:
Be used to realize the electrical to optical converter of even electric light translation function, the optical-electrical converter of photoelectric converting function is used to realize to happen suddenly, be used to realize the multiplexer of homogeneous interconnection function, be used to realize the to happen suddenly coupler of branch connection function is used for the local side micro-control unit that PON local side apparatus (PONC) is managed and is used to carry out the impact detector of collision detection;
Wherein, electrical to optical converter links to each other with optical fiber distributing net (ODN) with optical-electrical converter, one end of local side micro-control unit links to each other with PON System Management Unit (PSU), the other end links to each other with coupler, impact detector and multiplexer by control bus, optical-electrical converter is sent to coupler and impact detector respectively with received signal, and multiplexer is sent to electrical to optical converter with signal.
The PON remote equipment (PONR) of aforesaid passive light network transmission system comprises:
The electrical to optical converter of electric light translation function is used to realize to happen suddenly, be used to realize the optical-electrical converter of even photoelectric converting function, the multiplexer of multiple connection function is used to realize to happen suddenly, be used to realize evenly dividing the coupler of connection function, be used for the micro-control unit that PON remote equipment (PONR) is managed and be used for that system uplink is located the system that controls that delays time locating delay controller;
Wherein, electrical to optical converter links to each other with optical fiber distributing net (ODN) with optical-electrical converter, one end of far-end micro-control unit links to each other with PON System Management Unit (PSU), the other end links to each other with multiplexer with coupler, system's location delay controller by control bus, optical-electrical converter sends acknowledge(ment) signal to coupler, coupler outputs signal to system's location delay controller, and system's location delay controller outputs signal to multiplexer, and the multiplexer signal is sent to electrical to optical converter.
The delay control method that the present invention proposes adopts the control method in relative time delay, realizes that by system's location delay controller of PON System Management Unit (PSU) control PON remote equipment (PONR) it may further comprise the steps:
1, define system position length L is a multi-frame length;
2, PON System Management Unit (PSU) sends reading order to the local side micro-control unit;
3, impact detector detects Ts PONR burst time slot signal;
4, the local side micro-control unit reads testing result from impact detector, and replys to PON System Management Unit (PSU);
5, PON System Management Unit (PSU) carries out discriminatory analysis to detection;
6, PON System Management Unit (PSU) sends judged result to the far-end micro-control unit;
7, the far-end micro-control unit is controlled the last line delay of system by system's location delay controller.
Implement passive light network transmission system and the delay control method thereof based on the time division multiple access access technology of the present invention, collision detection result by impact detector, by the control of delaying time of system location delay controller, avoid in the prior art time delay control procedure complicated between the PONC and PONR, system configuration is simple, lower design cost, improved the reliability of system.
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is the formation schematic diagram of passive light network transmission system;
Fig. 2 is an absolute delay control method data flow multi-frame structure schematic diagram in the prior art;
Fig. 3 is the multi-frame structure schematic diagram of the used upward signal of the present invention;
Fig. 4 is the used passive optical network local side apparatus PONC structural representation of the present invention;
Fig. 5 is the used EPON remote equipment PONR structural representation of the present invention;
Fig. 6 is the used time delay control flow schematic diagram of the present invention.
Passive light network transmission system as shown in Figure 1, it comprises a PON local side apparatus (PONC) 1, optical fiber distributing net (ODN) 2, PON remote equipment (PONR) 3 and PON System Management Unit (PSU) 4, and a plurality of PON remote equipments (PONR) 3 link to each other with a PON local side apparatus (PONC) 1 by optical fiber distributing net (ODN) 2; PON System Management Unit (PSU) 4 links to each other with PON remote equipment (PONR) 3 with PON local side apparatus (PONC) 1 by management interface.
Fig. 2 is the data flow multi-frame structure of the upward signal that adopts in the Chinese patent 98113186, and it is by frame head HEAD and a series of valid data frame BF# 1, BF# 2 ..., BF#Ts constitutes, its length L=10ms.
Fig. 3 has provided and proposed by the invention has sent to the upward signal of local side apparatus (PONC) by remote equipment (PONR), and its multi-frame structure is by a series of valid data frame BF# 1, BF# 2 ..., BF#Ts constitutes, its length L=125us.
As shown in Figure 4, the concrete connected mode of local side apparatus (PONC) 1 is: electrical to optical converter 101 links to each other with optical fiber distributing net (ODN) 2 with optical-electrical converter 102, local side micro-control unit 105 links to each other with PON System Management Unit (PSU) 4, the burst electrical signal data bag that optical-electrical converter 102 will receive is sent to coupler 104 and impact detector 106 be used to happen suddenly tap and collision detection respectively, local side micro-control unit 105 is by control bus and coupler 104, impact detector 106 links to each other with multiplexer 103, and the downlink electrical signal data bag that multiplexer 103 is good with multiple connection is sent to electrical to optical converter 101 and is used for the electric light conversion.
As shown in Figure 5, the concrete connected mode of remote equipment (PONR) is: electrical to optical converter 301 links to each other with optical fiber distributing net (ODN) 2 with optical-electrical converter 302, far-end micro-control unit 305 links to each other with PON System Management Unit (PSU) 4, coupler 304 output system framing signal control system location delay controller 306, system's location delay controller 306 output systems relocate signal controlling multiplexer 303, far-end micro-control unit 305 is by control bus and coupler 304, system's location delay controller 306 links to each other with multiplexer 303, and the uplink burst electrical signal data bag that multiplexer 303 is good with multiple connection is sent to electrical to optical converter 301 and is used for the electric light conversion.
Time delay control for Ts PONR realizes that by following steps its flow chart is by shown in Figure 6:
1. define system position length L is a multi-frame length, system's location initial point is produced by PON local side apparatus (PONC) 1, and send PON remote equipment (PONR) 3 to by downlink multiframes, in the system each unit all reference system location initial point carry out work, the location of each unit in the system can be described by the relative distance N of itself and system's location initial point, and N is not more than L;
2.PON System Management Unit (PSU) 4 order local side micro-control units 105 read Ts PONR collision status message;
3. each PONR burst time slot signal of 106 couples of Ts of impact detector detects.If detect this signal, then Ts PONR burst of impact detector 106 output time slot signal is in happen suddenly time slot signal and system of time delay state of a control and Ts PONR and locatees the relative distance N (Ts) of initial point, and N (Ts) is not more than the position length L of system; If do not detect this signal, then Ts PONR burst of impact detector 106 outputs time slot signal is in the time delay collision status.The object of the detection of impact detector 106 is the time slot address of PONR burst time slot signal, and its length is 8 bits, adopts the self-checking code type to be used for error-detection error-correction, and the cycle is the position length L of system.
4. local side micro-control unit 105 reads the collision status of Ts PONR from impact detector 106, and collision status is replied to PON System Management Unit (PSU) 4.
5. be time delay control as collision status, PON System Management Unit (PSU) 4 is analyzed the current system location time-delay length M (Ts) of these PONR, and this M (Ts) is not more than the position length L of system and its value and is the difference sum with the position length L of system and this PONR relative distance of M (Ts) last time; Simultaneously PSU (4) sends current M (Ts) the far-end micro-control unit 305 of this PONR to, and far-end micro-control unit 305 makes the up state of activation that is in by the up location time-delay of system's location delay controller 306 control system.
6. be the time delay collision as collision status, far-end micro-control unit 305 these message of broadcasting of other PONR of PON System Management Unit (PSU) 4 in system, far-end micro-control unit 305 makes the up deactivation status that is in by the up location of system's location delay controller 306 shutdown systems.
7. when being in state of activation,, send the burst time slot signal by being delayed time in the system location; When being in deactivation status,, do not send the burst time slot signal by the system location is locked.
Claims (5)
1, a kind of passive light network transmission system comprises a local side apparatus (1), optical fiber distributing net (2), remote equipment (3) and System Management Unit (4); It is characterized in that:
Described local side apparatus (1) comprises electrical to optical converter (101), optical-electrical converter (102), multiplexer (103), coupler (104), local side micro-control unit (105) and impact detector (106);
Wherein, optical-electrical converter (102) receives the signal from optical fiber distributing net (2), and the signal of telecommunication after will changing is sent to coupler (104) and impact detector (106) respectively, one end of local side micro-control unit (105) links to each other with System Management Unit (4), the other end links to each other with coupler (104), impact detector (106) and multiplexer (103) by control bus, multiplexer (103) is sent to electrical to optical converter (101) with signal, and the light signal after will being changed by electrical to optical converter (101) again is sent to optical fiber distributing net (2).
2, passive light network transmission system as claimed in claim 1 is characterized in that:
Described remote equipment (3) comprises electrical to optical converter (301), optical-electrical converter (302), multiplexer (303), coupler (304), far-end micro-control unit (305) and system's location delay controller (306); Wherein, one end of far-end micro-control unit (305) links to each other with System Management Unit (4), the other end is by control bus and coupler (304), system's location delay controller (306) links to each other with multiplexer (303), optical-electrical converter (102) receives the signal from optical fiber distributing net (2), and the signal of telecommunication after will changing is sent to coupler (304), coupler (304) outputs signal to system's location delay controller (306), system's location delay controller (306) outputs signal to multiplexer (303), multiplexer (303) is sent to electrical to optical converter (301) with signal, and the light signal after will being changed by electrical to optical converter (301) again is sent to optical fiber distributing net (2).
3, a kind ofly realize the method for time delay control, it is characterized in that it realizes by following steps by the described system of claim 1:
1) define system position length L is a multi-frame length, L=125us;
2) System Management Unit (4) sends reading order to local side micro-control unit (105);
3) impact detector (106) detects Ts remote equipment burst time slot signal;
4) local side micro-control unit (105) reads testing result from impact detector (106), and replys to System Management Unit (4);
5) System Management Unit (4) is judged testing result;
6) System Management Unit (4) sends judged result to far-end micro-control unit (305);
7) far-end micro-control unit (305) is controlled the last line delay of system by system's location delay controller (306).
4, the method for time delay control as claimed in claim 3 is characterized in that: impact detector in the described step 3) (106) detects by following steps Ts remote equipment burst time slot signal and realizes:
(1) impact detector (106) detects the time slot address of remote equipment burst time slot signal;
(2) if impact detector (106) detects Ts remote equipment burst time slot signal, Ts remote equipment burst of impact detector (106) output time slot signal is in happen suddenly time slot signal and system of time delay state of a control and Ts remote equipment and locatees the relative distance N (Ts) of initial point, and the scope of N (Ts) is not more than L;
(3) if when impact detector (106) does not detect Ts remote equipment burst time slot signal, Ts remote equipment of impact detector (106) output time slot signal that happens suddenly is in the time delay collision status.
5, the method for time delay control as claimed in claim 3, it is characterized in that: system's location delay controller (306) is controlled the last line delay of system and is achieved in that in the described step 7)
(1) if Ts remote equipment burst time slot signal is in the time delay state of a control, system's location delay controller (306) activates Ts remote equipment burst time slot signal;
(2) if Ts remote equipment burst time slot signal is in the time delay collision status, Ts remote equipment burst of system's location delay controller (306) deexcitation time slot signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001197959A CN1140083C (en) | 2000-08-26 | 2000-08-26 | Passive light network transmission system and its delay control method |
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| CNB001197959A CN1140083C (en) | 2000-08-26 | 2000-08-26 | Passive light network transmission system and its delay control method |
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| CN1325204A CN1325204A (en) | 2001-12-05 |
| CN1140083C true CN1140083C (en) | 2004-02-25 |
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| CNB001197959A Expired - Lifetime CN1140083C (en) | 2000-08-26 | 2000-08-26 | Passive light network transmission system and its delay control method |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI20031104A0 (en) * | 2003-07-25 | 2003-07-25 | Nokia Corp | Fiber optic protection in telecommunications networks |
| KR100529952B1 (en) | 2004-03-22 | 2005-11-22 | 엘지전자 주식회사 | Multi air conditioner's central control system and its operating method |
| CN100384123C (en) * | 2005-04-13 | 2008-04-23 | 华为技术有限公司 | Kilomega passive optical network system |
| CN100536381C (en) | 2005-12-23 | 2009-09-02 | 华为技术有限公司 | Passive light network maintenance method and light network unit and light circuit terminal |
| CN101317349B (en) * | 2006-05-18 | 2011-07-06 | 华为技术有限公司 | Passive optical network maintenance method, optical network unit and optical line terminal |
| CN101677290B (en) * | 2008-09-17 | 2011-12-21 | 华为技术有限公司 | Method, device and system for eliminating channel confliction between multimode terminal systems |
| CN102014216B (en) * | 2010-12-28 | 2013-06-12 | 中国科学院国家授时中心 | Method and device for detecting transmission delay of channels of public switched telephone network |
| CN104009801B (en) * | 2013-02-27 | 2016-09-07 | 中兴通讯股份有限公司 | The optical signal processing method of a kind of optical-fiber network and device |
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2000
- 2000-08-26 CN CNB001197959A patent/CN1140083C/en not_active Expired - Lifetime
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Owner name: ZTE CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHENZHENG CITY ZTE CO., LTD. |
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Address after: 518057 Zhongxing building, science and technology south road, Nanshan District hi tech Industrial Park, Guangdong, Shenzhen Patentee after: ZTE Corporation Address before: 518057, Guangdong province Shenzhen Nanshan District hi tech Industrial Park, science and technology south road, ZTE building A block 6 floor of the legal department Patentee before: Zhongxing Communication Co., Ltd., Shenzhen City |
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Granted publication date: 20040225 |