CN110708135A - Communication control system and method of passive optical network - Google Patents
Communication control system and method of passive optical network Download PDFInfo
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- CN110708135A CN110708135A CN201911121114.0A CN201911121114A CN110708135A CN 110708135 A CN110708135 A CN 110708135A CN 201911121114 A CN201911121114 A CN 201911121114A CN 110708135 A CN110708135 A CN 110708135A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/009—Topology aspects
- H04Q2011/0096—Tree
Abstract
The invention relates to the technical field of communication, and provides a communication control system and a method of a passive optical network, wherein a signal synchronization processing device and a signal synchronization compensation device are respectively added between a local side and an optical distribution network, and between the optical distribution network and a user side, and T1= T2= T3 is realized by acquiring, comparing and changing a clock, so that the clock synchronization of the local side, the optical distribution network and the user side is maintained. In the passive optical network with the tree topology, the time of the previous node is compared with the time of the next node, the time of the multilayer nodes in the uplink transmission mode or the downlink transmission mode is sequentially changed, and the nodes are numbered, so that the clocks of all the nodes are kept synchronous, and the disorder of multiple nodes caused when clock information is transmitted between the nodes in different layers is avoided.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a communication control system and method for a passive optical network.
Background
A Passive Optical Network (PON) is a new type of optical access network technology, and is a typical point-to-multipoint transmission network. The passive optical network is composed of a local side (OLT), an Optical Distribution Network (ODN) and a user side (ONU), and is a single-fiber bidirectional system. The PON is used as a new generation broadband access technology, has high reliability and low maintenance cost, can meet the requirements of the broadband service at present and in the future, and is increasingly widely applied.
The passive optical network may employ various network topologies, such as a star network, a ring network, a tree network, and so on. When the number of nodes and terminals in the passive optical network is large, Time Division Multiplexing (TDM) technology is adopted in the downlink transmission direction from the OLT to the ODN/OUN; or ODN/OUN to OLT, in the upstream transmission direction, using Time Division Multiple Access (TDMA), there is a higher requirement on the clock accuracy of the passive optical network. In order to synchronize the time of each device in the passive optical network, it is necessary to ensure that the master clock and the slave clock are synchronized, i.e. the OLT, the ODN, and the OUN all maintain clock synchronization.
Disclosure of Invention
The present invention aims to overcome the defects in the prior art, and provides a communication control system and method for a passive optical network, so that the initial synchronization time and the terminal synchronization time keep clock synchronization.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a communication control system of passive optical network includes a local side, an optical distribution network, a user side which are connected in sequence, and also includes:
the signal synchronization processing device is connected between the local side and the optical distribution network and used for acquiring initial synchronization time of the local side and transmitting the initial synchronization time to the optical distribution network;
the signal synchronization compensation device is connected between the optical distribution network and the user side and used for adjusting the terminal synchronization time of the optical distribution network according to the initial synchronization time so as to ensure that the user side and the local side keep time synchronization;
and the server storage device is connected between the signal synchronous processing device and the signal synchronous compensation device and is used for exchanging information between the signal synchronous processing device and the signal synchronous compensation device.
Further, in order to better implement the present invention, the signal synchronization processing apparatus includes:
an obtaining unit, configured to obtain an initial synchronization time at a local side;
the adjusting unit is used for performing downlink delay adjustment on the initial synchronization time acquired by the acquiring unit so that the optical distribution network receives accurate initial synchronization time and sends the initial synchronization time to the server storage device for storage;
and the indicating unit is used for transmitting the initial synchronization time adjusted by the adjusting unit to the optical distribution network.
Further, in order to better implement the present invention, the signal synchronization compensation apparatus includes:
a receiving unit, configured to receive a current synchronization time of the optical distribution network;
the comparison unit is used for acquiring the initial synchronization time stored in the server storage device and comparing the initial synchronization time with the current synchronization time to obtain a synchronization time difference;
and the compensation unit is used for compensating the current synchronization time according to the synchronization time difference obtained by the comparison unit so as to keep the terminal synchronization time and the initial synchronization time synchronous.
Further, in order to better implement the present invention, the server storage device includes:
the message generating unit is used for receiving the initial synchronization time sent by the signal synchronization processing device and generating an initial synchronization message;
and the message sending unit is used for sending the initial synchronization message to the signal synchronization compensation device.
Furthermore, in order to better implement the present invention, the office side includes an optical fiber access terminal, and a plurality of office devices respectively connected to the optical fiber access terminal, and each office device is connected to a signal synchronization processing device;
the optical distribution network comprises a plurality of optical splitters, each signal synchronous processing device is respectively connected with a plurality of optical splitters, and each optical splitter is connected with a signal synchronous compensation device;
the user side comprises a plurality of terminal devices, and each signal synchronization compensation device is respectively connected with the plurality of terminal devices.
A communication control method of a passive optical network includes the following steps:
step S2: the signal synchronization processing device acquires initial synchronization time of the local side equipment, sends the initial synchronization time to the server storage device for storage, and sends the initial synchronization time to the optical distribution network;
step S3: the server storage device receives the initial synchronization time sent by the signal synchronization processing device and sends the initial synchronization time to the signal synchronization compensation device;
step S4: and the signal synchronization compensation device compensates the current synchronization time of the optical distribution network according to the initial synchronization time in the server storage device, so that the terminal synchronization time and the initial synchronization time are kept synchronous.
Furthermore, in order to better implement the invention, the method also comprises the following steps:
step S1: the optical fiber access terminal sends the optical fiber signal to the local side equipment.
Further, in order to better implement the present invention, the step S2 specifically includes the following steps:
step S2-1: an acquisition unit in the signal synchronization processing device acquires initial synchronization time of local side equipment and sends the initial synchronization time to an adjustment unit;
step S2-2: the adjusting unit calculates downlink delay according to the number of optical splitters connected with the signal synchronous processing device in the optical distribution network;
step S2-3: the adjusting unit performs downlink delay adjustment on the initial synchronization time sent by the obtaining unit according to the calculated downlink delay;
step S2-4: the adjusting unit sends the adjusted initial synchronization time to the storage unit for storage, and sends the initial synchronization time to the indicating unit;
step S2-5: and the indicating unit respectively sends the adjusted initial synchronization time to each optical splitter.
Further, in order to better implement the present invention, the step S3 specifically includes the following steps:
step S3-1: a message generating unit in the server storage device receives the initial synchronization time sent by the signal synchronization processing device and generates an initial synchronization message;
step S3-2: and the message sending unit sends the initial synchronous message to the signal synchronous compensation device.
Further, in order to better implement the present invention, the step S4 specifically includes the following steps:
step S4-1: a receiving unit in the signal synchronization compensation device receives the current synchronization time of the optical splitter and sends the current synchronization time to a comparison unit;
step S4-2: the comparison unit receives the initial synchronization message sent by the message sending unit, compares the initial synchronization time in the initial synchronization message with the current synchronization time, and calculates to obtain a synchronization time difference;
step S4-3: and the compensation unit compensates the current synchronization time according to the calculated synchronization time difference to obtain the terminal synchronization time, and transmits the terminal synchronization time to each terminal device, so that the terminal device and the local side device keep time synchronization.
Compared with the prior art, the invention has the beneficial effects that:
the method comprises the steps of adding a signal synchronization processing device and a signal synchronization compensation device between an office side and an optical distribution network and between the optical distribution network and a user side respectively, wherein the signal synchronization processing device and the signal synchronization compensation device are used for firstly obtaining an initial synchronization time T1, then comparing the current synchronization time T2 with the initial synchronization time T1, if the T2 is not equal to the T1, changing the current synchronization time T2 to enable the T2 to be equal to the initial synchronization time T1, then obtaining a terminal synchronization time T3, comparing the terminal synchronization time T3 with the initial synchronization time T1, if the T3 is not equal to the T1, changing the terminal synchronization time T3 to enable the T3 to be equal to the initial synchronization time T1, and finally enabling T1= T2= T3, and keeping clock synchronization of the office side, the optical distribution network and the user side. In the passive optical network with the tree topology, the time of the previous node is compared with the time of the next node, the time of the multilayer nodes in the uplink transmission mode or the downlink transmission mode is sequentially changed, and the nodes are numbered, so that the clocks of all the nodes are kept synchronous, and the disorder of multiple nodes caused when clock information is transmitted between the nodes in different layers is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a block diagram of a communication control system of the present invention;
FIG. 2 is a block diagram of a signal synchronization processing apparatus according to the present invention;
fig. 3 is a block diagram of a signal synchronization compensation apparatus according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The present invention is realized by the following technical solution, as shown in fig. 1, a communication control system of a passive optical network includes a local side, an optical distribution network, and a user side, which are connected in sequence, the passive optical network of this embodiment is described in detail by taking a tree network as an example, the local side includes an optical fiber access terminal, and a plurality of local side equipments OLT connected to the optical fiber access terminal, and each local side equipment OLT is connected to a signal synchronization processing apparatus. The optical distribution network ODN comprises a plurality of optical splitters, each signal synchronous processing device is respectively connected with the plurality of optical splitters to form a tree network, and each optical splitter is connected with one signal synchronous compensation device. The user side comprises a plurality of terminal equipment ONUs, each signal synchronization compensation device is respectively connected with a plurality of terminal equipment OUNs, and each terminal equipment ONU corresponds to one user.
When the optical fiber signal is in a downlink transmission mode, the communication control system of the passive optical network further includes:
and the signal synchronization processing device is connected between the local side OLT and the optical distribution network ODN and is used for acquiring the initial synchronization time T1 of the local side OLT and transmitting the initial synchronization time T1 to the optical distribution network ODN.
And the signal synchronization compensation device is connected between the optical distribution network ODN and the user side ONU and is used for adjusting the terminal synchronization time T3 of the optical distribution network according to the initial synchronization time T1 so that the user side ONU and the local side OLT keep time synchronization.
And the server storage device is connected between the signal synchronous processing device and the signal synchronous compensation device and used for exchanging information between the signal synchronous processing device and the signal synchronous compensation device, all the signal synchronous processing devices are connected to the server storage device, and all the signal synchronous compensation devices are also connected to the server storage device.
The invention uses the signal synchronous processing device and the signal synchronous compensation device to carry out clock monitoring on the transmitted signals, so that the user side, the optical distribution network and the local side all keep clock synchronization.
In detail, each central office device is connected with a signal synchronization processing apparatus, as shown in fig. 2, the signal synchronization processing apparatus includes:
an obtaining unit, connected to the office device, configured to obtain an initial synchronization time T1 of the office device.
And the adjusting unit is used for performing downlink delay adjustment on the initial synchronization time T1 acquired by the acquiring unit, so that the optical distribution network receives accurate initial synchronization time, and sends the initial synchronization time T1 to the server storage device for storage.
And the indicating unit is used for transmitting the initial synchronization time T1 adjusted by the adjusting unit to the optical distribution network.
It should be noted that, the adjusting unit performs downlink delay adjustment on the initial synchronization time T1 acquired by the acquiring unit according to the number of optical splitters connected to the signal synchronization processing apparatus, and the specific method is as follows: assuming that the signal synchronization processing apparatus is connected with three optical splitters, the three optical splitters are numbered as a first optical splitter, a second optical splitter and a third optical splitter in sequence, when the acquisition unit obtains the initial synchronization time T1 of the central office device, the instruction unit simultaneously broadcasts an address connection request of the initial synchronization time T1 to the three optical splitters, and the three optical splitters extract the address of the initial synchronization time T1 from the address connection request and compare the address with the address set by the three optical splitters.
If the address set by the optical splitter is the same as the address of the initial synchronization time T1, the optical splitter returns a confirmed connection instruction to the indicating unit, and then the indicating unit establishes the connection between the office device and the optical splitter and can keep the clock of the optical splitter and the clock of the office device synchronized; if the splitter itself has set an address that is not the same as the address of the initial synchronization time T1, a change of address request is returned to the pointing unit.
At this time, the indicating unit establishes connection with the optical splitter returning the confirmation and sends an initial synchronization time T1 to the optical splitter; the indicating unit sends an address change request returned by the optical splitter to the adjusting unit, the adjusting unit extracts the address of the optical splitter in the address change request, the address corresponds to the downlink delay T1 ', the adjusting unit changes the downlink delay T1' into the initial synchronization time T1, then encapsulates the changed initial synchronization time T1 into an address modification request and sends the address modification request to the corresponding optical splitter, at the moment, the optical splitter extracts the address in the address modification request, modifies the address of the optical splitter into the address in the address modification request, and returns a confirmed connection indication to the indicating unit, so that all the optical splitters can be connected with the local side equipment, and clocks of all the optical splitters keep synchronous with the clock of the local side equipment. The adjusting unit is to transmit the initial synchronization time T1 to the server storage device for the signal synchronization compensation device to extract.
As shown in fig. 3, the signal synchronization compensating apparatus includes:
and the receiving unit is used for receiving the current synchronization time T2 of the optical distribution network.
And the comparison unit is used for acquiring the initial synchronization time T1 stored in the server storage device and comparing the initial synchronization time T1 with the current synchronization time T2 to obtain a synchronization time difference △ T.
And the compensating unit is used for compensating the current synchronization time T2 according to the synchronization time difference △ T obtained by the comparing unit to obtain a terminal synchronization time T3, so that the terminal synchronization time T3 and the initial synchronization time T1 are kept synchronous.
The server storage device includes:
and the message generating unit is used for receiving the initial synchronization time T1 sent by the signal synchronization processing device and generating an initial synchronization message.
And the message sending unit is used for sending the initial synchronization message to the signal synchronization compensation device.
It should be noted that, since each optical splitter is connected to one signal synchronization compensation device, in this embodiment, only a downlink transmission mode of one optical splitter is described in detail, and a specific way for the signal synchronization compensation device to keep the terminal synchronization time T3 synchronized with the initial synchronization time T1 is as follows: the time when the optical splitter outputs the signal is the current synchronization time T2, and the receiving unit in the signal synchronization compensation apparatus receives the current synchronization time T2 and transmits the current synchronization time T2 to the comparison unit.
Each time the message generating unit in the server storage device receives the initial synchronization time T1 sent by the adjusting unit, the message generating unit generates an initial synchronization message, where the message includes the initial synchronization time T1, an address of the initial synchronization time T1, the number and serial number of optical splitters connected to the central office device, and the downlink delay T1' of each optical splitter, and the message generating unit numbers the initial synchronization message according to the serial number of the optical splitters, for example, the first central office device OLT1 is connected to three optical splitters through the signal synchronization processing device, so that the message generating unit numbers the initial synchronization message of the central office device with two-bit serial numbers (1, 3), and searches for the serial number of the first optical splitter with three-bit serial numbers (1, 3, 1).
A comparison unit in the signal synchronization compensation device sends an initial synchronization message corresponding to an optical splitter from a server storage device according to the number of the optical splitter connected to a receiving unit, where the receiving unit can only know that the optical splitter is connected to a first number of central office devices and the number of the optical splitter in a connection chain of the central office device, such as that the optical splitter is connected to a first central office device and is numbered as a first optical splitter among a plurality of optical splitters connected to the central office device, a request for obtaining the initial synchronization message sent to the server storage device by the comparison unit is a three-bit number (1, x, 1), the message sending unit traverses the message with the number (1, x, 1) from a plurality of initial synchronization messages, and since the optical splitter is known to belong to the first central office device in the request sent by the server storage device comparison unit, the message sending unit can completely supplement the number, convert the three-digit number into the two-digit number to which the three-digit number belongs, and send the initial synchronous message corresponding to the two-digit number to the comparison unit.
The purpose of numbering the local side equipment and the optical splitters in the invention is that in the tree network, the optical splitters under the same node do not know that the node is connected with a plurality of optical splitters, and if each optical splitter generates a single initial synchronization message, a huge data stream is generated, so that the delay of the passive optical network is increased and the data flow is blocked. Therefore, the optical splitter belonging to the same office equipment generates a message, and the number corresponding to the message is retrieved from the message according to the number of the optical splitter, so that the initial synchronization time T1 can be obtained, and huge data flow can not be generated in the passive optical network system under the condition that the accurate initial synchronization time T1 can be obtained.
The comparison unit compares the received address of the current synchronization time T2 with the acquired address of the initial synchronization time T1, if the address of the current synchronization time T2 is the same as the address of the initial synchronization time T1, the comparison unit sends a compensation signal of "0" to the compensation unit, if the addresses are different, the comparison unit subtracts the initial synchronization time T1 from the current synchronization time T2 to obtain a synchronization time difference △ T, if △ T is greater than 0, the comparison unit sends a "-" compensation signal to the compensation unit, the compensation unit performs frame subtraction adjustment on the current synchronization time T2 to make the current synchronization time T2 equal to the initial synchronization time T1, and returns the synchronization initial time T1 to the optical splitter, so that the current synchronization time output by the optical distribution network ODN is equal to the initial synchronization time T1 of the optical distribution network OLT, thereby keeping the clock synchronization between the optical distribution network ODN and the office device OLT in synchronization, and keeping the clock synchronization between the current synchronization time T3638 and the initial synchronization time T3985 of the optical distribution network OLT, and the optical distribution network OLT.
When the compensation unit receives the compensation signal of "0" sent by the comparison unit, which indicates that the clocks of the optical distribution network ODN and the local side device OLT are synchronized, the compensation unit sends the initial synchronization time T1 to the end device ONU, and simultaneously sends a request for returning the clock. Since in the tree network, one optical splitter is connected to a plurality of terminal devices OUN, the comparison unit numbers the terminal devices ONU connected to each optical splitter, for example, if the first optical splitter is connected to three terminal devices, the compensation unit sends a request for returning a clock to the three terminal devices at the same time. After receiving the clock return request, the terminal equipment ONU returns the address of the terminal synchronization time T3 of the terminal equipment ONU to the compensation equipment, and the comparison unit compares the address of the initial synchronization time T1 with the address of the terminal synchronization time T3.
If the address of the terminal synchronization time T3 is the same as the address of the initial synchronization time T1, the comparison unit sends a confirmed command signal to the compensation unit, and at this time, the compensation unit does not change the terminal synchronization time T3 of the terminal device OUN, and if the address of the terminal synchronization time T3 is different from the address of the initial synchronization time T1, the comparison unit subtracts the initial synchronization time T1 from the terminal synchronization time T3 to obtain a terminal synchronization time difference △ T '. if △ T' is greater than 0, the comparison unit sends a "-" compensation signal to the compensation unit, the compensation unit sends a change clock request to the terminal device, the change clock request includes the address of the initial synchronization time T1, the terminal device changes the address of the terminal synchronization time T3 according to the address of the initial synchronization time T1, so that the address of the terminal synchronization time T3 is the same as the address of the initial synchronization time T1, and the terminal synchronization time T3 is equal to the initial synchronization time T1, thereby completing the ODN transmission of the optical distribution network terminal device and delaying the passive optical distribution network system optical network synchronization signal transmission.
In summary, the present invention adds a signal synchronization processing device and a signal synchronization compensation device between the local side and the optical distribution network, and between the optical distribution network and the user side, which are all to obtain an initial synchronization time T1, then compare the current synchronization time T2 with the initial synchronization time T1, if T2 is not equal to T1, change the current synchronization time T2 to make T2 equal to the initial synchronization time T1, then obtain a terminal synchronization time T3, compare the terminal synchronization time T3 with the initial synchronization time T1, if T3 is not equal to T1, change the terminal synchronization time T3 to make T3 equal to the initial synchronization time T1, and finally make T1= T2= T3, so as to keep the clocks of the local side, the optical distribution network and the user side synchronized.
Based on the system, the invention provides a communication control method of a passive optical network, which comprises the following steps:
step S1: the optical fiber access terminal sends the optical fiber signal to the local side equipment;
step S2: the signal synchronization processing device acquires initial synchronization time of the local side equipment, sends the initial synchronization time to the server storage device for storage, and sends the initial synchronization time to the optical distribution network;
the step S2 specifically includes the following steps:
step S2-1: an acquisition unit in the signal synchronization processing device acquires initial synchronization time of local side equipment and sends the initial synchronization time to an adjustment unit;
step S2-2: the adjusting unit calculates downlink delay according to the number of optical splitters connected with the signal synchronous processing device in the optical distribution network;
step S2-3: the adjusting unit performs downlink delay adjustment on the initial synchronization time sent by the obtaining unit according to the calculated downlink delay;
step S2-4: the adjusting unit sends the adjusted initial synchronization time to the storage unit for storage, and sends the initial synchronization time to the indicating unit;
step S2-5: the indicating unit respectively sends the adjusted initial synchronization time to each optical splitter;
step S3: the server storage device receives the initial synchronization time sent by the signal synchronization processing device and sends the initial synchronization time to the signal synchronization compensation device;
the step S3 specifically includes the following steps:
step S3-1: a message generating unit in the server storage device receives the initial synchronization time sent by the signal synchronization processing device and generates an initial synchronization message;
step S3-2: the message sending unit sends the initial synchronous message to a signal synchronous compensation device;
step S4: the signal synchronization compensation device compensates the current synchronization time of the optical distribution network according to the initial synchronization time in the server storage device, so that the terminal synchronization time and the initial synchronization time are kept synchronous;
the step S4 specifically includes the following steps:
step S4-1: a receiving unit in the signal synchronization compensation device receives the current synchronization time of the optical splitter and sends the current synchronization time to a comparison unit;
step S4-2: the comparison unit receives the initial synchronization message sent by the message sending unit, compares the initial synchronization time in the initial synchronization message with the current synchronization time, and calculates to obtain a synchronization time difference;
step S4-3: and the compensation unit compensates the current synchronization time according to the calculated synchronization time difference to obtain the terminal synchronization time, and transmits the terminal synchronization time to each terminal device, so that the terminal device and the local side device keep time synchronization.
Example 2:
as another possible implementation manner, since the PON is a single-fiber bidirectional system, when the PON performs uplink transmission, the manner of acquiring, comparing and changing the clock is the same as that in example 1. When the PON is in an uplink transmission mode, the clock of the terminal device is the initial synchronization time T1, the clock of the optical distribution network is the current synchronization time T2, and the clock of the office device is the terminal synchronization time T3, so that finally T1= T2= T3, and clock synchronization of the terminal device, the optical distribution network, and the office device is maintained.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A communication control system of passive optical network includes a local side, an optical distribution network, and a user side which are connected in sequence, and is characterized in that: further comprising:
the signal synchronization processing device is connected between the local side and the optical distribution network and used for acquiring initial synchronization time of the local side and transmitting the initial synchronization time to the optical distribution network;
the signal synchronization compensation device is connected between the optical distribution network and the user side and used for adjusting the terminal synchronization time of the optical distribution network according to the initial synchronization time so as to ensure that the user side and the local side keep time synchronization;
and the server storage device is connected between the signal synchronous processing device and the signal synchronous compensation device and is used for exchanging information between the signal synchronous processing device and the signal synchronous compensation device.
2. A communication control system of a passive optical network according to claim 1, characterized in that: the signal synchronization processing apparatus includes:
an obtaining unit, configured to obtain an initial synchronization time at a local side;
the adjusting unit is used for performing downlink delay adjustment on the initial synchronization time acquired by the acquiring unit so that the optical distribution network receives accurate initial synchronization time and sends the initial synchronization time to the server storage device for storage;
and the indicating unit is used for transmitting the initial synchronization time adjusted by the adjusting unit to the optical distribution network.
3. A communication control system of a passive optical network according to claim 2, characterized in that: the signal synchronization compensation apparatus includes:
a receiving unit, configured to receive a current synchronization time of the optical distribution network;
the comparison unit is used for acquiring the initial synchronization time stored in the server storage device and comparing the initial synchronization time with the current synchronization time to obtain a synchronization time difference;
and the compensation unit is used for compensating the current synchronization time according to the synchronization time difference obtained by the comparison unit so as to keep the terminal synchronization time and the initial synchronization time synchronous.
4. A communication control system of a passive optical network according to claim 3, characterized in that: the server storage device includes:
the message generating unit is used for receiving the initial synchronization time sent by the signal synchronization processing device and generating an initial synchronization message;
and the message sending unit is used for sending the initial synchronization message to the signal synchronization compensation device.
5. A communication control system of a passive optical network according to any of claims 1-4, characterized in that: the local side comprises an optical fiber access terminal and a plurality of local side devices respectively connected with the optical fiber access terminal, and each local side device is connected with a signal synchronous processing device;
the optical distribution network comprises a plurality of optical splitters, each signal synchronous processing device is respectively connected with a plurality of optical splitters, and each optical splitter is connected with a signal synchronous compensation device;
the user side comprises a plurality of terminal devices, and each signal synchronization compensation device is respectively connected with the plurality of terminal devices.
6. The communication control method of a passive optical network according to claim 1, characterized in that: the method comprises the following steps:
step S2: the signal synchronization processing device acquires initial synchronization time of the local side equipment, sends the initial synchronization time to the server storage device for storage, and sends the initial synchronization time to the optical distribution network;
step S3: the server storage device receives the initial synchronization time sent by the signal synchronization processing device and sends the initial synchronization time to the signal synchronization compensation device;
step S4: and the signal synchronization compensation device compensates the current synchronization time of the optical distribution network according to the initial synchronization time in the server storage device, so that the terminal synchronization time and the initial synchronization time are kept synchronous.
7. The communication control method of a passive optical network according to claim 6, wherein: further comprising the steps of:
step S1: the optical fiber access terminal sends the optical fiber signal to the local side equipment.
8. The communication control method of a passive optical network according to claim 7, wherein: the step S2 specifically includes the following steps:
step S2-1: an acquisition unit in the signal synchronization processing device acquires initial synchronization time of local side equipment and sends the initial synchronization time to an adjustment unit;
step S2-2: the adjusting unit calculates downlink delay according to the number of optical splitters connected with the signal synchronous processing device in the optical distribution network;
step S2-3: the adjusting unit performs downlink delay adjustment on the initial synchronization time sent by the obtaining unit according to the calculated downlink delay;
step S2-4: the adjusting unit sends the adjusted initial synchronization time to the storage unit for storage, and sends the initial synchronization time to the indicating unit;
step S2-5: and the indicating unit respectively sends the adjusted initial synchronization time to each optical splitter.
9. The communication control method of a passive optical network according to claim 8, wherein: the step S3 specifically includes the following steps:
step S3-1: a message generating unit in the server storage device receives the initial synchronization time sent by the signal synchronization processing device and generates an initial synchronization message;
step S3-2: and the message sending unit sends the initial synchronous message to the signal synchronous compensation device.
10. The communication control method of a passive optical network according to claim 9, wherein: the step S4 specifically includes the following steps:
step S4-1: a receiving unit in the signal synchronization compensation device receives the current synchronization time of the optical splitter and sends the current synchronization time to a comparison unit;
step S4-2: the comparison unit receives the initial synchronization message sent by the message sending unit, compares the initial synchronization time in the initial synchronization message with the current synchronization time, and calculates to obtain a synchronization time difference;
step S4-3: and the compensation unit compensates the current synchronization time according to the calculated synchronization time difference to obtain the terminal synchronization time, and transmits the terminal synchronization time to each terminal device, so that the terminal device and the local side device keep time synchronization.
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