CN100350763C - Time supply and synchronizing system for telecommunication network - Google Patents
Time supply and synchronizing system for telecommunication network Download PDFInfo
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- CN100350763C CN100350763C CNB2004100156213A CN200410015621A CN100350763C CN 100350763 C CN100350763 C CN 100350763C CN B2004100156213 A CNB2004100156213 A CN B2004100156213A CN 200410015621 A CN200410015621 A CN 200410015621A CN 100350763 C CN100350763 C CN 100350763C
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Abstract
The present invention relates to a time supply and synchronizing system for a telecommunication network, which comprises time synchronism central equipment which receives the coordinated universal time from various time sources and periodically transmits the coordinated universal time to a far-end time synchronism slave by a transmission channel in definite time. The far-end time synchronism slave receives a standard time signal of the time synchronism central equipment, synchronously sends the standard time signal to each service unit and simultaneously feed back the standard time signal to the time synchronism central equipment; the time central equipment carries out the time delay calculation, and then the calculation result is sent to the far-end time synchronism slave. The system of the present invention has the transmission delay correction and realizes that the time synchronism error of each far-end node is less than 1 ms. The time synchronism central equipment and the far-end time synchronism slave have the time holding function. The system of the present invention is mainly applied to the time synchronization in the telecommunication network, fully utilizes the telecommunication resource, has high transmission quality and simultaneously reduces the construction cost.
Description
Technical field
The present invention relates to a kind of time supply and synchro system (time that is designated hereinafter simply as is supplied with and synchro system) that is applied to telecommunications network, particularly a kind ofly universal time-the Coordinated Universal Time(UTC) (UTC) that receives is sent to each far-end time synchronized slave unit (hereinafter to be referred as the far-end slave unit), makes all far-end slave unit time precise synchronization in the system of Coordinated Universal Time(UTC) by time synchronized central apparatus (hereinafter to be referred as central apparatus).The far-end slave unit can need the object of identified time to enclose time tag to all in its service range.
Background technology
For traditional electrical phone network and mobile radio communication all is the network in the cloth and the whole nation, their interoffice communication and internetwork communication, comprise transmit continue, control messages and with the user with call out relevant data, all adopt common channel signalling No. seven in China, therefore, the signaling network operation conditions that telecommunications network is played supporting role directly influences the service quality of communication.In recent years, each telecom operators proposes and puts forth effort to implement the construction of signaling monitoring system one after another, the operation of monitoring signaling network, gather the message that transmits on the interoffice signaling link, grasp the real time information of the whole network operation, analyze, add up, in time handle the problem that takes place, improve communication network service quality.
Because the real-time and the randomness of communication are stronger, the processing procedure that once continues need transmit many signaling messages, for message being carried out effectively, correctly analyzing, requires signaling monitoring system each the bar signaling message that monitors to be marked the time of its generation.Monitoring signaling point generally is located at Signalling Transfer Point, and what have is located at signalling point.Need to monitor simultaneously many signaling links on each monitoring point, so not only require to be distributed in the monitoring system far-end monitoring equipment and monitoring center's time synchronized of different location, a plurality of monitoring means in monitoring point also will be realized time synchronized.Because it is the blanking time of two message bags in communication switching may be very short, therefore, also just very high to the accuracy requirement of time synchronized.If adopt without synchronous independent clock the monitoring point, then be impossible realize.
Technology (1) formerly, Chinese patent application number 01104016.5 (publication number CN 11309486A) provide a kind of time synchronizing method, and the time distributior that it comprises can be to the terminal installation transmitting time synchronizing signal of a plurality of long distances.Its time is directly to be taken from GPS (Global Position System) (abbreviation gps system).Its time synchronizing signal is to be made of the initial identification signal of expression signal and the absolute time signal of express time, and just the lead edge timing of identification signal is synchronized with the Coordinated Universal Time(UTC) (being called for short UTC), is to send after two signals are superimposed as serial signal.
Technology (2) formerly, Chinese patent application number 93104567.3 (publication number CN 1082285A) provide a kind of clock synchronization system, its core is a clock synchronization, the adjustment of local crystal oscillator just, the operating frequency that is about to local clock is adjusted to consistent with the external perimysium reference incoming frequency, by using the gps clock source, come constantly the deviation of local clock to be corrected.The transmission of its signal is to utilize that radio path has reduced investment with broadcast mode delivery time message in the paging network.So can be described as a kind of system that is applicable to radio paging network.When it is used to keep the clock time signal of response timing signal, be counter with a continuous stepping.This counter steps circuit is a voltage controlled oscillator that the variable frequency output signal takes place.Be used to produce the signal of a variable frequency meter.To control voltage by synchronous circuit and offer relevant voltage controlled oscillator, be used to set up said timing signal.It is the time synchronized between point-to-points paging centers of an attended operation.
Summary of the invention
The present invention provides a kind of time that is applied to telecommunications network to supply with and synchro system in order to reach the purpose that the time that makes all far-end slave units can both accurately be synchronized with Coordinated Universal Time(UTC) (being called for short UTC).
The present invention is for achieving the above object, and the technical measures of being taked are: require the time of the present invention to supply with and mainly comprise with synchro system: time synchronized central apparatus (abbreviating central apparatus as), far-end time synchronized slave unit (abbreviating the far-end slave unit as) and the transmission channel that is connected between the two.Said central apparatus mainly is the time reference signal that obtains from multiple time source among the present invention, and timing cycle ground sends the far-end slave unit to by transmission channel, and receives the time signal that the far-end slave unit feeds back, and carries out the correction time delay; The said far-end slave unit time reference signal that receiving center equipment transmits from transmission channel, synchronized transmission be to each service unit, and feed back to central apparatus simultaneously, and the pulsed drive that produces a 2KHz frequency makes the operation of local zone time clock.Said intermediate conveyor path is to utilize 2.048Mbit/S digital link or telecommunications to transmit net.
Specifically, the time of the present invention is supplied with and synchro system is a time synchronized central apparatus and a far-end time synchronized slave unit with reception Coordinated Universal Time(UTC) (UTC), and both connect by transmission channel, can realize by means of transmission system in the telecommunications network.After time server in the time synchronized central apparatus receives and assists the universal time (UTC) that withers, by main time communication unit time signal is transformed into high speed data link control specification (HDLC) message bag, through digital crossover linkage unit (DXC) periodically in network all far-end time synchronized slave units send.System is by mensuration and time broadcasting to signal remote transmission time delay, drives interrupts and time period proofread and correct, the time and the UTC of inner each subdivision of all far-end slave units and far-end slave unit are consistent, realize mutual time precise synchronization, time error is less than 1ms.The service unit of far-end slave unit can be used universal computer platform, can carry out the temporal information transmission in many ways to the service object, and can synthesize in a physical bodies with the service object.
When time supply of the present invention is applied to the Signaling System Number 7 monitoring system with synchro system, a kind of international standardized No.7 common channel signalling that the ITU of far-end slave unit (International Telecommunication Association) formulates.This signaling is also adopted in the communication of office border in China Telecom's net, is included in public telephone network (traditional telephone network), mobile radio communication and the intelligent network.The ruuning situation of No.7 signaling is most important to the service quality of communication on the communication network, and for this reason, each telecom operation company of China is installing No.7 signaling monitoring system in the telecommunications network of various places just.
Characteristics of the present invention are:
(1) time of the present invention is supplied with synchro system and has realized receiving universal time-Coordinated Universal Time(UTC) (UTC) by a central apparatus, through transmission channel (2.048M digital link or telecommunications transmit net) time signal is sent to each distant-end node that all need the standard time, sets up local time clock.And can be by measurement, 2kHz impulsive synchronization, 5 pulse per second (PPS)s correction and UDP (user data package newspaper) broadcasting on schedule of using the transmission time, the time precise synchronization that realizes far-end slave unit and inner each unit is in UTC.Time of the present invention supply just is with synchro system and formerly technology (2) is different, the present invention is that the time source of each node is from a central apparatus, the synchronous core of local zone time is the clock of operating system on the subscriber unit of synchronous various places, and the strange land is by time synchronized unit, the synchronous various places of digital communi-cations link synchronously.
(2) central apparatus of the present invention adopts HDLC high speed data link communication mode to the far-end slave unit, cycle sends the message bag that has the standard time, receive the message that the far-end slave unit is beamed back, thereby the mensuration transmission delay sends to each far-end slave unit in following one-period with standard time and propagation delay time.Time and propagation delay time that each far-end slave unit is sent according to central apparatus are determined the local standard time.Realize that time synchronization error is less than 1ms between each distant-end node.
(3) far-end slave unit of the present invention and central apparatus are synchronous; Regularly sent a UDP time broadcast bag to service unit in per 5 seconds, the unit on making synchronously can obtain a more accurate initial time in 5 seconds.
(4) 5 seconds lock-out pulses on schedule in the far-end slave unit of the present invention in time obtain correcting in case all service units are obtained when initial time departs from time of origin.
(5) far-end slave unit of the present invention inserts 2KHz pulse clock synchronizing signal between the pulse per second (PPS) of output, offers operating system as the interruption of a high top grade in outside.Operating system interrupts this to interrupt as the time.Local all service units all are connected with the 2KHz pulse, have guaranteed the consistency of time synchronized, and error is less than 0.5ms.
(6) central apparatus of the present invention and far-end slave unit all keep function if having time, and system safety is reliable.In case clock source signals in service is interrupted, in the central apparatus in main time communication unit and digital crossover unit, transmission line or the far-end slave unit from the time communication unit any part break down, service unit still can be kept work, and continuing provides the standard time to the service object.
(7) system of the present invention can transmit net by telecommunications and realize that long distance transmits signal, and the far-end slave unit can be laid in any place, obtains to use widely.
(8) system of the present invention is mainly used in the time synchronized in the telecommunications network.Because office in the telecommunications network, stand and they and administrative center between, generally be provided with digital communi-cations link, and all digital transmission paths, a high accuracy clock is realized that the whole network is synchronous, provide an accurate clock source signals to clock synchronization system, utilize this resource, realize the time synchronized of each equipment of strange land, the transmission quality height.And needn't lay private cable/optical cable, and make full use of telecommunication resources, reducing the construction costs.
(9) be provided with time server in time supply of the present invention and the synchro system, can from gps receiver, obtain time signal, also can obtain time reference signal from other clock source.
Description of drawings
The schematic diagram that Fig. 1 constitutes for system of the present invention.
Fig. 2 is the schematic diagram that time synchronized central apparatus 2 of the present invention constitutes.
Fig. 3 is the schematic diagram that far-end time synchronized slave unit 4 of the present invention constitutes.
Fig. 4 is the schematic diagram of far-end slave unit standard time message pick-up process among the present invention.
Fig. 5 is the UDP of system of the present invention and the schematic diagram of 5 pulse per second (PPS) synchronizing processes.
Fig. 6 is the schematic diagram of each service unit and 2kHz impulsive synchronization process in the far-end slave unit.
Fig. 7 is the formation schematic diagram of the time server 201 that central apparatus of the present invention comprises among above-mentioned Fig. 2.
Fig. 8 is the formation schematic diagram of main time communication unit 202 among above-mentioned Fig. 2.
Fig. 9 is the formation schematic diagram of digital crossover linkage unit 203 among above-mentioned Fig. 2.
Figure 10 is from the formation schematic diagram of time communication unit 401 among above-mentioned Fig. 3.
Embodiment
Specifically describe the architectural feature of system of the present invention below in conjunction with accompanying drawing.
Fig. 1 is the simple structure block diagram of time supply of the present invention and synchro system.Central apparatus 2 links to each other with multiple standards time source 1.Central apparatus 2 communicates with a plurality of far-end slave units 4 that contain several service units by intermediate conveyor path 3.
Said intermediate conveyor path 3 is each 64kbit/s paths in the 2.048Mbit/s digital link.Transmission means can be PDH (Pseudo-synchronous Digital Hierarchy) (PDH) or SDH (Synchronous Digital Hierarchy) (SDH).Usually can transmit net by means of telecommunications, time synchronized central apparatus in the system of the present invention thus and far-end slave unit are telecommunications and transmit node in the net.
Said multiple standards time source 1 comprises: GPS (Global Position System) (GPS) receiver of Coordinated Universal Time(UTC) (UTC) can be provided, or the NTP (Network Time Protocol) on the Internet (NTP) Coordinated Universal Time(UTC) (UTC) of being transmitted etc.
Time synchronized central apparatus 2 receives universal time UTC, and periodically the signal propagation delay time of UTC time signal and mensuration was outputed on the 2.048Mbit/s digital link with 5 second time interval, by the exchange of digital crossover linkage unit (DXC), send to each far-end time synchronized slave unit 4 respectively.After far-end slave unit 4 receives time signal, to the service unit broadcast standard time, and the time clock of service unit carried out drives interrupts and time adjustment, thereby realize that system-wide is the time precise synchronization of benchmark with universal time (Coordinated Universal Time(UTC) UTC).And for to the signal collecting module of service object-signaling monitoring system-the provide standard time.Simultaneously, immediately signal is returned to central apparatus after the time signal that the far-end slave unit is sent at the center of receiving, calculate propagation delay time so that central apparatus to be provided.
Fig. 2 is the structural representation of central apparatus 2 in the system of the present invention.Central apparatus 2 of the present invention mainly comprises: time server 201, the main time communication unit 202 that links to each other with time server 201 outputs, with the digital crossover linkage unit 203 that main time communication unit 202 outputs link to each other, the output of digital crossover linkage unit 203 is connected on the far-end slave unit 4 through transmission channel.
Universal time-Coordinated Universal Time(UTC) of time synchronized central apparatus (UTC)-by time server 201 adopts and obtains, and delivers to main time communication unit 202 by Ethernet interface.
Said time server 201 has time maintenance function.It contains the internal time clock and the clock source is synchronized with external timing signal, in case system loses the external time source, internal clock source can be kept the output of standard time according to the frequency work of original locking.Time server 201 also has the selection function of multiple time source, can obtain the UTC time from GPS (Global Position System) (GPS) receiver 101 or from the Internet by NTP (NTP (Network Time Protocol)) 102, to adapt to different environments for use, improve security of system.
Said main time communication unit 202 converts the standard time that receives to high speed data link control specification (HDLC) message bag, with 5 second cycle, each 64kbit/s path from the 2.048Mbit/s digital link sent to digital crossover unit 203 (DXC).
Fig. 3 is the structural representation of far-end slave unit 4.It mainly comprises: from time communication unit 401, be communicated to several service units 402,403,404 from the output of time communication unit 401 ...Each service unit 402,403,404 ..., all be communicated to service object 405 places.
The value of standard time and transmission delay calculates the real time that this far-end slave unit receives message in 5 seconds periodic messages bags that each far-end time synchronized slave unit is sent according to central apparatus, with this of local zone time clock time calibration.And produced a UDP bag that has the current standard time in per 5 seconds, issue service unit.The pulsed drive that produces a 2kHz frequency simultaneously makes the operation of local zone time clock.Also produce 5 seconds recurrent pulse on schedule in addition, in order to correction to the time.
Far-end time synchronized slave unit has time maintenance function.When the time synchronized central apparatus breaks down, can continue to keep the output of universal time.
By above-mentioned Fig. 1, Fig. 2, Fig. 3 as can be known, the standard time of time synchronized central apparatus 2 is obtained by time server 201 in the system of the present invention.The time source 1 of time server 201 can be from GPS (GPS (Global Position System)) 101 with Coordinated Universal Time(UTC) output or the Internet 102 etc.
After main 202 time of receipt (T of R) of the time communication unit server 201 of central apparatus 1 sends the signal and pulse per second (PPS) that has the standard time, message bag with high speed data link control procedure (HDLC) form,, transmitted the standard time that net will this moment from the 64kbit/s path of each 2.048Mbit/s link or telecommunications and send far-end time synchronized slave unit 4 on schedule constantly periodically by digital crossover linkage unit (DXC) 203 at per 5 seconds.
Behind the message bag that has the standard time that far-end time synchronized slave unit 4 receives, immediately former message bag is returned to central apparatus.Keeping the standard time that central apparatus is sent in the message.
After central apparatus is received the message that each far-end slave unit returns, according to receiving the time that the time of returning bag and Bao Nei keep, calculate each far-end slave unit transmission needed time of journey, along with the next standard time message bag that was sent in 5 seconds is given each far-end time synchronized slave unit respectively,, it determines the local standard time so that being provided.
Fig. 4 is the definite schematic diagram of 4 times of far-end slave unit among the present invention.As shown in Figure 4, send a time synchronized message M bag for each far-end time synchronized slave unit 4 by time synchronized central apparatus 2, this message M comprises the value t1 of a current time and the value d of a transmission delay, and the initial value of d equals 0.Message M sends to far-end slave unit 4 in the HDLC mode, and far-end time synchronized slave unit 4 returns to central apparatus 2 with this message after receiving this HDLC message immediately.After central apparatus 2 is received this message of returning, calculate poor between the interior contained transmitting time t1 of the time t2 receive these return messages and message bag, calculate one way transmission delay value d.Subsequently, central apparatus 2 is attached to this transmission delay value d in the next message M bag, sends to far-end slave unit 4.Time t1 when each far-end slave unit 4 obtains central apparatus 2 transmission message M and the value d of transmission delay can calculate the real time that this far-end time synchronized slave unit 4 receives message M, according to this value correcting local time clock.
Fig. 5 is the synchronizing process of user datagram (UDP) in the system of the present invention with 5 pulse per second (PPS)s.When the time clock of each far-end slave unit by the time synchronized central apparatus synchronously after, whenever produced a user datagram (UDP) message on schedule in 5 seconds, send to all service units in this far-end slave unit 4 by Web broadcast.Comprise the standard time when sending message in this message bag.After service unit is received udp broadcast message, when the contained time in the UDP bag with the service unit time deviation during greater than certain value, wrap the interior given time with UDP and be as the criterion, again the initial service unit current time.Each far-end slave unit produces a pulse simultaneously, sends to its all service unit, and the current time that makes all service units in this far-end slave unit was to alignment in immediate positive 5 seconds., to revise the time delay of bringing in the transmission of UDP bag.
Fig. 6 is the 2kHz synchronizing process of each service unit.When the clock of far-end time synchronized slave unit 4 according to itself, the pulse that produces a 2kHz, all service units or time synchronism equipment apply for interrupting (IRQ) simultaneously in this far-end slave unit.Pulse of the every generation of far-end slave unit, each service unit or time synchronism equipment just respond an interruption, and the minimum timeslice of this drives interrupts operating system is constantly advanced.And be that each process is dispatched by chronomere with the minimum timeslice of operating system, the minimum timeslice of having unified the operating system on each service unit or the time synchronism equipment, just the time clock of each service unit can be consistent, cause all service units and keep synchronously.The 2kHz synchronizing process is seen Fig. 6.
In sum, the time of the present invention is supplied with and the transmission of synchro system by HDLC message bag, realizes the UTC time of each far-end time synchronized slave unit is supplied with synchronously; By the UDP information broadcast time, the driving of the pulse of 5 pulse per second (PPS) alignment times and 2kHz on schedule realizes all service unit time synchronized in the far-end time synchronized slave unit, thereby the time precise synchronization that makes each equipment in the system is in UTC.
Fig. 7 is the structural representation of time server 201 in the central apparatus 2.The core of time server 201 is CPU 2011.CPU 2011 has a plurality of (at least four) time source signal input port, and is connected on the main time quantum 202 by first Ethernet interface 2012 and the first pulse per second (PPS) interface 2013.CPU 2011 can connect gps receiver 101, receives its standard time serial signal of sending and 1 pulse per second (PPS), also can connect the Internet 102, and (NTP) obtains the standard time from network with NTP (Network Time Protocol).And get one of them time source signal according to the order of priority of appointment, with simple network time (SNTP) protocol package form, send to main time communication unit 202 by first Ethernet 2012.The CPU 2011 of time server 201 produces a local pps pulse per second signal simultaneously by the first pulse per second (PPS) interface 2013, in company with issuing main time communication unit 202 together.Time server 201 is except that direct reception gps signal, also can receive other multiple time format code signal, as U.S. range time group time encoding form B000 (ITIG DCLS BOOO Inter-RangeInstrumentation Group, Time Code Format B000), international time format encoded signals such as U.S. range time group time encoding form B120 (IRIG Time Code Format B120) and NTP are to satisfy the needs of different applications.
Fig. 8 is the structural representation of main time synchronized unit 202 in the central apparatus 2.Main time communication unit 202 consists predominantly of main processor unit 2021, main digital interface 2022, second Ethernet interface 2023 and the second pulse per second (PPS) interface 2024.Main processor unit 2021 by second Ethernet interface 2023 and the second pulse per second (PPS) interface 2024 respectively with time server 201 in CPU 2011 on first Ethernet interface 2012 link to each other with the first pulse per second (PPS) interface 2013.Main processor unit 2021 links to each other with digital crossover linkage unit 203 by main digital interface 2022.The time signal of pps pulse per second signal that main processor unit 2021 time of reception servers 201 are sent through the second pulse per second (PPS) interface 2024 and the SNTP protocol package form sent through second Ethernet interface 2023.After treatment, convert time signal to HDLC message bag, on each time slot of 2.048Mbit/s data link, delivered to main digital interface 2022 with 5 second cycle.Main digital interface 2022 sends to digital crossover linkage unit (DXC) 203 with the HDLC packet in the code stream mode.Main time communication unit 202 receives the far-end slave unit inverse signal that DXC203 sends from main digital interface 2022, time according to former HDLC bag of the time of receiving inverse signal message bag and Bao Nei record is calculated the required time of transmission course, sends to the far-end slave unit in the HDLC message bag in next 5 second cycle.
Fig. 9 is the structural representation of digital crossover linkage unit 203 in the central apparatus 2.Digital crossover linkage unit (DXC) 203 mainly contains the time switch 2031 with a plurality of connection jaws, adopts the time gas exchange of semifixed exchanged form realization to N bar 2.048Mbit/s digital link.Wherein a 2.048Mbit/s link connects time synchronized central apparatus master time communication unit 202.All the other each bar links through transmission channel to far-end from time synchronism equipment 4.DXC passes through time gas exchange, each 64Mbit/s time signal in the 2.048Mbit/s link of in the future autonomous time communication unit 202, according to the route that sets in advance, a 64Mbit/s path from each bar 2.048Mbit/s link sends to far-end time synchronized slave unit.2.048Mbit/s link is a bi-directional path.Main time communication unit receives the message that each far-end slave unit returns when each far-end slave unit sends time reference signal in the 2.048Mbit/s input port.
Figure 10 is from the structural representation of time communication unit 401 in Fig. 3 far-end slave unit 4.Consist predominantly of from processor unit 4011, from digital interface 4012,5 pulse per second (PPS) interfaces 4013,2kHz pulse interface 4014 and three-ethernet mouth 4015 from time communication unit 401.Link to each other with service unit 402 with 5 pulse per second (PPS) interfaces 4013 by three-ethernet mouth 4015,2kHz pulse interface 4014 from processor unit 4011.Pass through to link to each other with central apparatus 2 with transmission channel 3 from processor unit 4011 from digital interface 4012.From time communication unit 401 by from the synchronous central apparatus of digital interface 4012 time of receptions with 5 second cycle, through time message bag that transmission channel is sent.It is transferred to from processor unit 4011.After processor unit 4011 is received the standard time, handle, periodically time message bag UDP was sent to each service unit simultaneously with broadcast mode by three-ethernet mouth 4015 in per 5 seconds.And send time of time message bag correction itself according to the center, and produce on schedule 5 seconds recurrent pulses and 2kHz pulse signal, directly issue each service unit 402 by 5 pulse per second (PPS) interfaces 4013 and 2kHz pulse interface 4014.
Claims (10)
1, a kind of time that is applied to telecommunications network is supplied with and synchro system, mainly comprise: time synchronized central apparatus (2), far-end time synchronized slave unit (4) and connection transmission channel (3) between the two, it is characterized in that said time synchronized central apparatus is that the time reference signal timing cycle ground that will obtain from multiple time source (1) sends far-end time synchronized slave unit (4) to by transmission channel (3), and receive the time signal that far-end time synchronized slave unit (4) feeds back, carry out time delay and calculate; The time reference signal that said far-end time synchronized slave unit (4) transmits by the synchronous central apparatus of transmission channel (3) time of reception (2), synchronized transmission is to each service unit, and feed back to time synchronized central apparatus (2) simultaneously, and the pulsed drive that produces a 2KHz frequency makes the operation of local zone time clock; Said transmission channel (3) is the 2.048Mbit/s digital link, or telecommunications transmits net.
2, the time that is applied to telecommunications network according to claim 1 is supplied with and synchro system, it is characterized in that said time synchronized central apparatus (2) mainly comprises: time server (201), the main time communication unit (202) that links to each other with time server (201) output, with the digital crossover linkage unit (203) that main time communication unit (202) output links to each other, the output of digital crossover linkage unit (203) is connected on the far-end time synchronized slave unit (4) by transmission channel (3).
3, the time that is applied to telecommunications network according to claim 2 is supplied with and synchro system, the core that it is characterized in that said time server (201) is CPU (2011), CPU (2011) has a plurality of time source signal input ports, and CPU (2011) is connected on the main time communication unit (202) by first Ethernet interface (2012) and the first pulse per second (PPS) interface (2013).
4, the time that is applied to telecommunications network according to claim 3 is supplied with and synchro system, it is characterized in that said main time communication unit (202) mainly contains main processor unit (2021), main digital interface (2022), second Ethernet interface (2023) and the second pulse per second (PPS) interface (2024); Main processor unit (2021) by second Ethernet interface (2023) and the second pulse per second (PPS) interface (2024) respectively with the CPU (2011) of time server (201) on first Ethernet interface (2012) link to each other with the first pulse per second (PPS) interface (2013), main processor unit (2021) links to each other with digital crossover linkage unit (203) by main digital interface (2022).
5, the time that is applied to telecommunications network according to claim 2 is supplied with and synchro system, it is characterized in that said digital crossover linkage unit (203) mainly contains the time switch (2031) with a plurality of connection jaws, one of them connection jaws is connected to main time communication unit (202), and other connection jaws is received on the far-end time synchronized slave unit (4) by transmission channel (3).
6, the time that is applied to telecommunications network according to claim 1 is supplied with and synchro system, it is characterized in that said far-end time synchronized slave unit (4) mainly comprises: from time communication unit (401), be communicated to several service units (402,403,404) from the output of time communication unit (401), each service unit (402,403,404) all is communicated to service object (405) and locates.
7, the time that is applied to telecommunications network according to claim 6 is supplied with and synchro system, it is characterized in that saidly mainly comprising: from processor unit (4011) from time communication unit (401), from digital interface (4012), 5 pulse per second (PPS) interfaces (4013), 2kHz pulse interface (4014) and three-ethernet mouth (4015), pass through three-ethernet mouth (4015) from processor unit (4011), 2kHz pulse interface (4014) and 5 pulse per second (PPS) interfaces (4013) and service unit (402,403,404) link to each other, pass through to link to each other with time synchronized central apparatus (2) with transmission channel (3) from digital interface (4012) from processor unit (4011).
8, the time that is applied to telecommunications network according to claim 1 is supplied with and synchro system, it is characterized in that said multiple time source (1) is the GPS (Global Position System) receiver of transmission coordination universal time, or the network time server of NTP (Network Time Protocol).
9, the time that is applied to telecommunications network according to claim 1 is supplied with and synchro system, it is characterized in that sending the message bag that has the standard time to the far-end time synchronized slave unit cycle through digital transmission link by the time synchronized central apparatus, receive the message that the far-end slave unit is beamed back, thereby measure transmission delay.
10, the time that is applied to telecommunications network according to claim 6 is supplied with and synchro system, it is characterized in that producing 5 pulse per second (PPS)s on schedule, UDP message bag and 2kHz and interrupts application and realize that all service units and UTC are synchronous.
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| CN101170353A (en) * | 2006-10-27 | 2008-04-30 | 华为技术有限公司 | Method and system for adjusting network time |
| CN101355675B (en) * | 2007-07-24 | 2012-12-19 | 中兴通讯股份有限公司 | Method for implementing time synchronization of telecommunication network node equipment and apparatus thereof |
| CN101783725B (en) * | 2009-01-20 | 2014-06-25 | 华为技术有限公司 | Method for outputting synchronous time, device and system thereof |
| CN101848193B (en) * | 2009-03-27 | 2013-11-06 | 华为技术有限公司 | Method, system and network node for network synchronization |
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