CN114125600A - Single-fiber multi-network safety access equipment and method based on time slot grouping - Google Patents
Single-fiber multi-network safety access equipment and method based on time slot grouping Download PDFInfo
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Abstract
The invention discloses a single-fiber multi-network safety access device and a method based on time slot grouping, wherein the device comprises an OLT, optical fiber splitters and ONUs, the OLT is connected with the optical fiber splitters, each optical fiber splitter is connected with the ONUs, the OLT device comprises an Ethernet processing module I, a basic PON processing module, a data buffering module I, a time slot distribution extraction module I, a frame synthesis decomposition module I, a time slot grouping control module, a maintenance control module and a newly-added PON control module, and the ONU terminal comprises a time slot distribution extraction module II, a frame synthesis decomposition module II, a data buffering module II, an Ethernet processing module II and an ONU processing module. The single-fiber multi-network safety access equipment and the method based on the time slot grouping, which are provided by the invention, carry out grouping on the time slots in the GPON frame by optimizing the configuration of the OLT equipment and the ONU terminal, realize multi-network safety access, simplify the network structure and improve the utilization rate of the equipment.
Description
Technical Field
The invention relates to the technical field of optical fiber communication networks, in particular to single-fiber multi-network safety access equipment and a method based on time slot grouping.
Background
At present, the development direction of network technology is multi-network convergence, the optical fiber access network solves the problem of information highway and multi-network convergence in the last kilometer, and transmits various information converged into one network to the desktop of a user home or office through optical fibers, wherein the various information comprises IP phones, digital televisions, IP network data and the like.
The existing optical fiber access network generally adopts a Passive Optical Network (PON) technology, and the PON is a general name of technologies such as GPON, EPON, NG-PON, XG-PON, and the like, and is a universal optical fiber access technology with international standards. The PON technology adopts a latest generation broadband optical integrated access standard, has numerous advantages of high bandwidth, high efficiency, large coverage area, rich user interfaces, etc., and is considered as an ideal technology for realizing the optical fiber, broadband, and integrated transformation of access network services by most operators. The PON technology-based device is composed of an optical line device OLT, an optical network unit ONU, and an optical distribution network ODN (see fig. 1) composed of optical fibers and optical splitters. The standard integrated fiber optic access network is suitable for most applications, and provides users with access to home television, telephone and the internet through one fiber, and provides enterprises with access to desktop ethernet data, video and telephone. However, under the condition of privacy requirement, multiple ethernet networks cannot be merged into one network, and two or more mutually independent ethernet networks are required to be accessed, in this case, a common set of optical fiber access network cannot realize the secure access of multiple networks, and only multiple sets of systems can be established to realize the multi-network access (as shown in fig. 2), and the complexity is obvious.
Disclosure of Invention
The invention aims to provide single-fiber multi-network safety access equipment and a method based on time slot grouping.
In order to achieve the purpose, the invention provides the following scheme:
a single fiber multi-network security access device based on time slot grouping, comprising: the optical line terminal comprises OLT equipment, optical fiber splitters and ONU terminals, wherein the OLT equipment is connected with the optical fiber splitters, and each optical fiber splitter is connected with the ONU terminals;
the OLT equipment comprises an Ethernet processing module I, a basic PON processing module I, a data buffering module I, a time slot allocation extraction module I, a frame synthesis decomposition module I, a time slot grouping control module, a maintenance control module and a newly-added PON control module, wherein the Ethernet processing module I, the data buffering module I, the time slot allocation extraction module I and the frame synthesis decomposition module I are sequentially connected, the basic PON processing module is respectively connected with the data buffering module I and the time slot grouping control module I, the data buffering module I is connected with the frame synthesis decomposition module I, the time slot grouping control module is respectively connected with the time slot allocation extraction module I and the frame synthesis decomposition module I, the maintenance control module is respectively connected with the time slot grouping control module and the newly-added PON control module, and the newly-added PON control module is connected with the time slot allocation extraction module I, the basic PON processing module is connected to a first network, the first Ethernet processing module is connected to a second network, the maintenance control module is provided with a maintenance interface, the first frame synthesis and decomposition module is connected with a first GPON interface, and the first GPON interface is connected with an access end of the optical fiber splitter;
the ONU terminal comprises a time slot distribution extraction module II, a frame synthesis decomposition module II, a data buffer module II, an Ethernet processing module II and an ONU processing module, the time slot distribution extraction module II is connected with the frame synthesis decomposition module II, the time slot distribution extraction module II, the data buffer module II and the Ethernet processing module II are sequentially connected, the frame synthesis decomposition module II, the data buffer module II and the ONU processing module are sequentially connected, the frame synthesis decomposition module II is connected with a GPON interface II, the ONU processing module, a sending control module and the GPON interface II are sequentially connected, the GPON interface II is connected with the output end of the optical fiber optical splitter, the ONU processing module outputs a network I, and the Ethernet processing module outputs a network II.
Optionally, the first data buffering module comprises a first ethernet received data buffering module, a first ethernet transmitted data buffering module, a first basic PON received data buffering module, and a first basic PON transmitted data buffering module, the first ethernet processing module is connected to the first time slot allocation and extraction module through the first ethernet received data buffering module and the first ethernet transmitted data buffering module, respectively, and the basic PON processing module is connected to the first frame synthesis and decomposition module through the first basic PON received data buffering module and the first basic PON transmitted data buffering module, respectively;
the second data buffering module comprises a second Ethernet received data buffering module, a second Ethernet transmitted data buffering module, a second basic PON received data buffering module and a second basic PON transmitted data buffering module, the second time slot allocation extraction module is respectively connected with the second Ethernet processing module through the second Ethernet received data buffering module and the second Ethernet transmitted data buffering module, and the second frame synthesis decomposition module is respectively connected with the second ONU processing module through the second basic PON received data buffering module and the second basic PON transmitted data buffering module;
the lengths of the first Ethernet received data cache module, the first Ethernet sent data cache module, the first basic PON received data cache module, the first basic PON sent data cache module, the second Ethernet received data cache module, the second Ethernet sent data cache module, the second basic PON received data cache module and the second basic PON sent data cache module can at least store one frame of data of the port, and the cache space is recycled.
Optionally, the system further comprises an encryption and decryption module I, an encryption and decryption module II, an encryption and decryption module III and an encryption and decryption module IV;
the first encryption and decryption module is arranged between the first Ethernet processing module and the first data buffer module, one end of the first encryption and decryption module is connected with the first Ethernet processing module, and the other end of the first encryption and decryption module is respectively connected with the first Ethernet received data buffer module and the first Ethernet sent data buffer module; the second encryption and decryption module is arranged between the basic PON processing module and the first data buffer module, one end of the second encryption and decryption module is connected with the basic PON processing module, and the other end of the second encryption and decryption module is respectively connected with the first basic PON receiving data buffer module and the first basic PON sending data buffer module;
the third encryption and decryption module is arranged between the second data buffer module and the second Ethernet processing module, one end of the third encryption and decryption module is respectively connected with the second Ethernet received data buffer module and the second Ethernet sent data buffer module, and the other end of the third encryption and decryption module is connected with the second Ethernet processing module; the encryption and decryption module IV is arranged between the data buffer module II and the ONU processing module, one end of the encryption and decryption module IV is respectively connected with the basic PON receiving data buffer module II and the basic PON sending data buffer module II, and the other end of the encryption and decryption module IV is connected with the ONU processing module;
the first encryption and decryption module and the second encryption and decryption module adopt different encryption modes, the third encryption and decryption module and the first encryption and decryption module adopt the same encryption mode, and the fourth encryption and decryption module and the second encryption and decryption module adopt the same encryption mode.
Optionally, there are multiple GPON interfaces, and the processing modes of the multiple GPON interfaces are the same.
A single-fiber multi-network safety access method based on time slot grouping is based on the single-fiber multi-network safety access equipment based on the time slot grouping, information transmission between OLT equipment and ONU terminals adopts a time division multiplexing mode, time slots are divided into a plurality of time slot groups through time slot grouping processing, different time slot groups bear different networks, an original single channel is changed into a multi-channel through time slot grouping processing, and different channels transmit different networks, and the method comprises the following steps:
step 1: the OLT equipment respectively puts the data of the network I and the network II in the corresponding time slot groups, and then sends the data to the ONU terminal through the optical fiber distributor, which specifically comprises the following steps:
step 1.1: the Ethernet processing module is externally connected to a newly added network II, data exchange processing is carried out on the network II inside the Ethernet processing module, and meanwhile the basic PON processing module is externally connected to the network I;
step 1.2: the first network and the second network send and receive data according to respective rates, when the two networks are converged into one network, two items of matching of transmission rate and receiving and sending positions are required, and a first data buffer module is utilized to provide data temporary storage for realizing the two items of matching;
step 1.3: the time slot grouping control module receives a frame synchronization signal of the basic PON processing module, generates a clock and a synchronization signal, controls the first frame synthesis and decomposition module and the first time slot distribution and extraction module to work so as to achieve the synchronization of the whole clock, receives control information of the maintenance control module at the same time, completes the time slot grouping control function, and enables the first frame synthesis and decomposition module to work according to a preset time slot grouping scheme; the newly added PON control module completes the PON management function of the network II, realizes data transmission with the original data through the GPON interface I and distributes the data to the corresponding ONU terminals;
step 1.4: according to the Ethernet, adopting packet data transmission, wherein each terminal corresponds to different IP addresses, the GPON adopts time division multiplexing data transmission, each terminal occupies different time slots, the first time slot allocation extraction module is utilized to complete the corresponding allocation between the packet data and the occupied time slots, and the data is inserted and extracted in the corresponding time slots, so that the conversion between the packet data transmission and the time division multiplexing data transmission is completed;
step 1.5: the frame synthesis and decomposition module I is used for realizing the synthesis and decomposition from two paths of data to one path of data, the synthesis is carried out in the GPON sending direction, the decomposition is carried out in the receiving direction, the information of the corresponding network is sent and received in the corresponding time slot grouping according to the control of the time slot grouping control module, a uniform information flow is formed in the GPON direction, and the information flow is divided into two different information flows in the opposite direction;
step 2: the ONU terminal firstly separates the data of the network I and the network II according to time slot grouping, then processes the data respectively, the processing circuits of the network I and the network II only process the information of the network respectively, and finally outputs the information to respective interfaces: the method specifically comprises the following steps:
step 2.1: the frame synthesis and decomposition module II is utilized to realize the synthesis and decomposition from two paths of data to one path of data, the synthesis is carried out in the GPON sending direction, the decomposition is carried out in the receiving direction, the information of the corresponding network is sent and received in the corresponding time slot grouping according to the control of the sending control module, a uniform information flow is formed in the GPON direction, and the information flow is divided into two different information flows in the opposite direction;
step 2.2: according to the Ethernet, packet data transmission is adopted, each terminal corresponds to different IP addresses, GPON adopts time division multiplexing data transmission, each terminal occupies different time slots, corresponding distribution between the packet data and the occupied time slots is completed by utilizing a time slot distribution extraction module II, and data is inserted and extracted in the corresponding time slots, so that conversion between the packet data transmission and the time division multiplexing data transmission is completed;
step 2.3: the first network and the second network send and receive data according to respective rates, when the two networks are converged into one network, two items of matching of transmission rate and receiving and sending positions are required, and a data buffer module II is utilized to provide data temporary storage for realizing the two items of matching;
step 2.4: the Ethernet processing module II outputs a newly added network II to the outside, performs data exchange processing on the network II inside, and simultaneously the ONU processing module outputs the network I.
Optionally, the scheme of grouping the time slots in step 1.3 and step 2.1 includes: the original time slots are divided into two time slot groups, one time slot group corresponds to a first network, the other time slot group corresponds to a second network, the grouping method adopts time slot interval grouping, namely each frame of even time slots is one group, each frame of odd time slots is the other group, or adopts time slot front and back grouping, namely the first half time slot of each frame is one group, and the second half time slot of each frame is the other group.
Optionally, the first data buffering module is used to provide data temporary storage for implementing two items of matching, and specifically includes: the first Ethernet receiving data cache module and the first Ethernet sending data cache module are used for temporarily storing data of a second network in the OLT equipment, and the first basic PON receiving data cache module and the first basic PON sending data cache module are used for temporarily storing data of a first network in the OLT equipment;
the data temporary storage is provided for realizing two items of matching by using the data buffer module II, and the method specifically comprises the following steps: and temporarily storing data of a second network in the ONU terminals by utilizing the second Ethernet received data cache module and the second Ethernet sent data cache module, and temporarily storing data of a first network in the ONU terminals by utilizing the second basic PON received data cache module and the first basic PON sent data cache module.
Optionally, the second network performs encryption and decryption operations by using the first encryption and decryption module when passing through the first ethernet processing module and the first data buffering module, the first network performs encryption and decryption operations by using the second encryption and decryption module when passing through the first basic PON processing module and the first data buffering module, the second network performs encryption and decryption operations by using the third encryption module when passing through the second data buffering module and the second ethernet processing module, and the first network performs encryption and decryption operations by using the fourth encryption module when passing through the second data buffering module and the ONU processing module.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a single-fiber multi-network safety access device and a method based on time slot grouping, which structurally improve OLT equipment and ONU terminals, add one path of Ethernet data in the original system, the PON adopts a time division multiplexing system, the data of different terminals occupy different time slots to realize single-point to multi-point communication, the invention adopts the time slot grouping to realize multi-network multi-point access, groups the original time slots, each time slot group independently bears one network, the original PON information occupies one time slot group, the newly added Ethernet occupies one time slot group, and the original time division multiplexing channel is changed into two information channels, thereby realizing multi-network safety access, and then the multi-network isolation access can be realized by matching with an encryption and decryption module, thereby saving the cost for users, reducing the equipment usage, simplifying the network structure, improving the equipment utilization rate, and quickly opening a new system, The maintenance management is convenient, and great benefits are brought to users.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a single-network integrated access device;
fig. 2 is a schematic structural diagram of a common access device implementing multi-network isolated access;
fig. 3 is a schematic structural diagram of a single-fiber multi-network secure access device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an OLT apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an ONU terminal according to an embodiment of the present invention;
FIG. 6a is a diagram illustrating timeslot allocation using inter-timeslot grouping according to an embodiment of the present invention;
fig. 6b is a schematic diagram of time slot allocation by using a grouping before and after the time slot according to the embodiment of the present invention.
Description of reference numerals: 1. an Ethernet processing module I; 2. a basic PON processing module; 3. a first encryption and decryption module; 4. a second encryption and decryption module; 5. a first data buffer module; 501. the Ethernet receives a first data caching module; 502. a first Ethernet transmission data caching module; 503. a first basic PON receiving data caching module; 504. a first basic PON sending data caching module; 6. a first time slot distribution and extraction module; 7. a frame synthesis decomposition module I; 8. a time slot grouping control module; 9. a maintenance control module; 10. a PON control module is added; 11. a first GPON interface; 12. a second GPON interface; 13. a transmission control module; 14. a second time slot distribution and extraction module; 15. a second frame synthesis decomposition module; 16. a second data buffer module; 1601. a second Ethernet receiving data caching module; 1602. a second Ethernet transmission data caching module; 1603. a second basic PON receiving data caching module; 1604. a second basic PON sending data caching module; 17. a third encryption and decryption module; 18. the encryption and decryption module IV; 19. an Ethernet processing module II; 20. and an ONU processing module.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide single-fiber multi-network safety access equipment and a method based on time slot grouping.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The embodiment of the invention is applied to add one or more independent Ethernet networks on the basis of the original functions of a standard PON, process a transmission channel in the equipment, adopt channel division and data encryption, the channel division is a main technical means, the data encryption is an auxiliary column means, one channel is changed into two or more mutually independent information channels by grouping time slots after processing, each information channel adopts a time division multiplexing mode, the working mode is the same as or similar to that of the PON, each information channel bears an independent network, data is extracted from the information channel at the terminal side respectively, the data is connected to a network interface after the data processing, and the network interfaces corresponding to different information channels are different networks.
As shown in fig. 3 to 5, a single fiber multi-network security access device based on timeslot grouping according to an embodiment of the present invention includes: the optical line terminal comprises OLT equipment, optical fiber splitters and ONU terminals, wherein the OLT equipment is connected with the optical fiber splitters, and each optical fiber splitter is connected with the ONU terminals;
the OLT equipment is key equipment in the embodiment of the invention, and is formed by adding a path of network input and adding some functional modules on the basis of the existing mature OLT equipment, wherein the added modules are used for completing the multiplexing of two networks on a GPON interface, thereby realizing the single-fiber multi-network safe access. The OLT device comprises an Ethernet processing module I1, a basic PON processing module 2, a data buffering module I5, a time slot allocation extraction module I6, a frame synthesis decomposition module I7, a time slot grouping control module 8, a maintenance control module 9 and a newly-added PON control module 10, wherein the Ethernet processing module I1, the data buffering module I5, the time slot allocation extraction module I6 and the frame synthesis decomposition module I7 are sequentially connected, the basic PON processing module 2 is respectively connected with the data buffering module I5 and the time slot grouping control module 8, the data buffering module I5 is connected with the frame synthesis decomposition module I7, the time slot grouping control module 8 is respectively connected with the time slot allocation extraction module I6 and the frame synthesis decomposition module I7, the maintenance control module 9 is respectively connected with the time slot grouping control module 8 and the newly-added PON control module 10, the newly-added PON control module 10 is connected with the first time slot allocation extraction module 6, the basic PON processing module 2 is connected to a first network, the first Ethernet processing module 1 is connected to a second network, the maintenance control module 9 is provided with a maintenance interface, the first frame synthesis decomposition module 7 is connected with a first GPON interface 11, and the first GPON interface 11 is connected with an access end of the optical fiber splitter; the ethernet processing module 1 has a plurality of output ports, the number of the ports corresponds to the number of the ports of the basic PON processing module 2, and only the processing procedure of one port is shown in the figure. Each OLT device includes a plurality of GPON interfaces one, and fig. 4 illustrates a processing procedure of one interface by taking one GPON interface one as an example, and the processing procedure of each interface is the same. The various modules in the OLT equipment operate in the electrical domain and the optical-to-electrical conversion is done in the GPON.
The ONU terminal is the far-end equipment of the OLT equipment, is matched with the OLT for use, recovers the data into original data through the ONU terminal after the data is transmitted by optical fiber, processes the data according to time slot groups, wherein different time slot groups correspond to different networks, and is connected with network terminals of different networks after the processing, thereby realizing the independent access of different networks. For simplicity, the function of the original ONU device is replaced by the "ONU processing module" and the "GPON interface one" to facilitate connection with the newly added function, which is actually more complicated than the newly added function, but the complexity of the new function is not the content mainly discussed in the embodiments of the present invention. The ONU terminal comprises a second time slot distribution extraction module 14, a second frame synthesis decomposition module 15, a second data buffer module 16, a second Ethernet processing module 19 and an ONU processing module 20, the second time slot distribution extraction module 14 is connected with the second frame synthesis decomposition module 15, the second time slot distribution extraction module 14, the second data buffer module 16 and the second Ethernet processing module 19 are sequentially connected, the second frame synthesis decomposition module 15, the second data buffer module 16 and the ONU processing module 20 are sequentially connected, the second frame synthesis decomposition module 15 is connected with a second GPON interface 12, the ONU processing module 20, the sending control module 13 and the second GPON interface 12 are sequentially connected, the second GPON interface 12 is connected with the output end of the optical fiber splitter, the first ONU processing module 20 outputs a first network and the second Ethernet processing module 19 outputs a second network. The ONU processing module, the sending control module and the GPON interface in the ONU terminal are original structural modules, the rest are newly added modules, the functions of the newly added modules are the same as those of the modules with the same name in the OLT composition, all the modules work in an electric domain, and the photoelectric conversion is completed in the GPON module. The main functions completed by the newly added module in the ONU terminal comprise: carrying out grouping control on the time slots; putting the original PON data into the corresponding packet time slot and taking out the data from the packet time slot; carrying out exchange processing on the newly added Ethernet data, and putting the data into the corresponding grouping time slot and taking out the data from the grouping time slot; the original PON data and the newly added Ethernet data are compounded into a path of data in the sending direction, and the original PON data and the newly added Ethernet data are separated from the path of data in the receiving direction.
The OLT equipment and the ONU terminal in the embodiment of the invention are the improvement of the traditional OLT equipment and ONU terminal, the simultaneous access of a plurality of networks can be realized by adopting the same optical distribution network, the application mode of the multi-network safe access is the same as that of a standard optical fiber access system, but the networks connected by different interfaces are mutually independent, and each network can independently carry out IP planning. In the Passive Optical Network (PON) application, the traditional OLT equipment and the ONU terminals are improved, so that the original single-network multipoint access system has the multi-network multipoint access capability.
The first data buffering module 5 includes a first ethernet received data buffering module 501, a first ethernet transmitted data buffering module 502, a first basic PON received data buffering module 503 and a first basic PON transmitted data buffering module 504, the first ethernet processing module 1 is connected to the first time slot allocation extraction module 6 through the first ethernet received data buffering module 501 and the first ethernet transmitted data buffering module 502, respectively, and the first basic PON processing module 2 is connected to the first frame synthesis decomposition module 7 through the first basic PON received data buffering module 503 and the first basic PON transmitted data buffering module 504, respectively;
the second data buffering module 16 includes a second ethernet receiving data buffering module 1601, a second ethernet sending data buffering module 1602, a second basic PON receiving data buffering module 1603, and a second basic PON sending data buffering module 1604, the second timeslot allocation extraction module 14 is connected to the second ethernet processing module 19 through the second ethernet receiving data buffering module 1601 and the second ethernet sending data buffering module 1602, respectively, and the second frame synthesis decomposition module 15 is connected to the second ONU processing module 20 through the second basic PON receiving data buffering module 1603 and the second basic PON sending data buffering module 1604, respectively;
the lengths of the first ethernet received data cache module 501, the first ethernet sent data cache module 502, the first basic PON received data cache module 503, the first basic PON sent data cache module 504, the second ethernet received data cache module 1601, the second ethernet sent data cache module 1602, the second basic PON received data cache module 1603, and the second basic PON sent data cache module 1604 can at least store one frame of data of the port, and the cache space is recycled.
Each port circuit of the data buffer module comprises a group of buffers, which correspond to the above-mentioned buffers, namely a sending data buffer and a receiving data buffer.
The single-fiber multi-network security access equipment further comprises a first encryption and decryption module 3, a second encryption and decryption module 4, a third encryption and decryption module 17 and a fourth encryption and decryption module 18;
the encryption and decryption module I3 is arranged between the Ethernet processing module I1 and the data buffer module I5, one end of the encryption and decryption module I3 is connected with the Ethernet processing module I1, and the other end of the encryption and decryption module I3 is respectively connected with the Ethernet received data buffer module I501 and the Ethernet sent data buffer module I502; the second encryption and decryption module 4 is arranged between the basic PON processing module 2 and the first data buffering module 5, one end of the second encryption and decryption module 4 is connected with the basic PON processing module 2, and the other end of the second encryption and decryption module 4 is connected with the first basic PON received data buffering module 503 and the first basic PON transmitted data buffering module 504 respectively; the purpose of the encryption and decryption module is to improve the isolation performance between different networks in GPON interface information transmission, two mutually independent information channels are formed together with a time slot grouping function, the encryption and decryption module I3 corresponds to original PON data, and the encryption and decryption module II 4 corresponds to newly added Ethernet data, so that one layer of isolation is added on the basis of time slot grouping of the two networks.
The third encryption and decryption module 17 is arranged between the second data buffer module 16 and the second ethernet processing module 19, one end of the third encryption and decryption module 17 is connected to the second ethernet received data buffer module 1601 and the second ethernet sent data buffer module 1602 respectively, and the other end of the third encryption and decryption module 17 is connected to the second ethernet processing module 19; the fourth encryption and decryption module 18 is disposed between the second data buffering module 16 and the ONU processing module 20, one end of the fourth encryption and decryption module 18 is connected to the second basic PON received data buffering module 1603 and the second basic PON sent data buffering module 1604 respectively, and the other end of the fourth encryption and decryption module 18 is connected to the ONU processing module 20;
the first encryption and decryption module 3 and the second encryption and decryption module 4 adopt different encryption modes, the third encryption and decryption module 17 and the first encryption and decryption module 3 adopt the same encryption mode, and the fourth encryption and decryption module 18 and the second encryption and decryption module 4 adopt the same encryption mode. The encryption module is realized by adopting a scrambler and a scrambler which are in parallel.
The GPON interface I11 is provided with a plurality of GPON interfaces, and the processing modes of the GPON interfaces I11 are the same.
A single-fiber multi-network safety access method based on time slot grouping is based on the single-fiber multi-network safety access equipment based on the time slot grouping, information transmission between OLT equipment and ONU terminals adopts a time division multiplexing mode, time slots are divided into a plurality of time slot groups through time slot grouping processing, different time slot groups bear different networks, an original single channel is changed into a multi-channel through time slot grouping processing, and different channels transmit different networks, and the method comprises the following steps:
step 1: the OLT equipment respectively puts the data of the network I and the network II in the corresponding time slot groups, and then sends the data to the ONU terminal through the optical fiber distributor, which specifically comprises the following steps:
step 1.1: the Ethernet processing module is externally connected to a newly added network II, data exchange processing is carried out on the network II inside the Ethernet processing module, and meanwhile the basic PON processing module is externally connected to the network I;
step 1.2: the first network and the second network send and receive data according to respective rates, when the two networks are converged into one network, two items of matching of transmission rate and receiving and sending positions are required, and a first data buffer module is utilized to provide data temporary storage for realizing the two items of matching;
step 1.3: the time slot grouping control module receives a frame synchronization signal of the basic PON processing module, generates a clock and a synchronization signal, controls the first frame synthesis and decomposition module and the first time slot distribution and extraction module to work so as to achieve the synchronization of the whole clock, receives control information of the maintenance control module at the same time, completes the time slot grouping control function, and enables the first frame synthesis and decomposition module to work according to a preset time slot grouping scheme; the newly added PON control module completes the PON management function of a newly added Ethernet (such as a network II) so as to realize data transmission with original data through a GPON interface I and distribute the data to corresponding ONU terminals; the maintenance control module is an extension of the maintenance management function in the basic PON processing module, and the main function of the maintenance control module is to control the time slot packet control module to achieve the purpose of controlling the bandwidth of each network, namely the bandwidth occupied by each network in the OLT equipment is controlled in the embodiment of the invention;
step 1.4: for each GPON interface, a time slot distribution and extraction module is required to be added, packet data transmission is adopted according to Ethernet, each terminal corresponds to different IP addresses, the GPON adopts time division multiplexing data transmission, each terminal occupies different time slots, the corresponding distribution between the packet data and the occupied time slots is completed by the time slot distribution and extraction module I, and data is inserted and extracted in the corresponding time slots, so that the conversion between the packet data transmission and the time division multiplexing data transmission is completed;
step 1.5: the frame synthesis and decomposition module I is used for realizing the synthesis and decomposition from two paths of data to one path of data, the synthesis is carried out in the GPON sending direction, the decomposition is carried out in the receiving direction, the information of the corresponding network is sent and received in the corresponding time slot grouping according to the control of the time slot grouping control module, a uniform information flow is formed in the GPON direction, and the information flow is divided into two different information flows in the opposite direction;
step 2: the ONU terminal firstly separates the data of the network I and the network II according to time slot grouping, then processes the data respectively, the processing circuits of the network I and the network II only process the information of the network respectively, and finally outputs the information to respective interfaces: the method specifically comprises the following steps:
step 2.1: the frame synthesis and decomposition module II is utilized to realize the synthesis and decomposition from two paths of data to one path of data, the synthesis is carried out in the GPON sending direction, the decomposition is carried out in the receiving direction, the information of the corresponding network is sent and received in the corresponding time slot grouping according to the control of the sending control module, a uniform information flow is formed in the GPON direction, and the information flow is divided into two different information flows in the opposite direction; the sending control module adopts an optical switch;
step 2.2: according to the Ethernet, packet data transmission is adopted, each terminal corresponds to different IP addresses, GPON adopts time division multiplexing data transmission, each terminal occupies different time slots, corresponding distribution between the packet data and the occupied time slots is completed by utilizing a time slot distribution extraction module II, and data is inserted and extracted in the corresponding time slots, so that conversion between the packet data transmission and the time division multiplexing data transmission is completed;
step 2.3: the first network and the second network send and receive data according to respective rates, when the two networks are converged into one network, two items of matching of transmission rate and receiving and sending positions are required, and a data buffer module II is utilized to provide data temporary storage for realizing the two items of matching;
step 2.4: the Ethernet processing module II outputs a newly added network II to the outside, performs data exchange processing on the network II inside, and simultaneously the ONU processing module outputs the network I.
According to the related standard of PON, the information transmitted between OLT equipment and ONU terminals is that signals after time division multiplexing are transmitted on a light wave, the signals are transmitted in a light wave channel after time division multiplexing, a channel is divided into a plurality of time slots, each time slot corresponds to different ONU terminals, OLT and OUN are one-to-many communication, a PON interface of the OLT equipment can be connected with a plurality of ONU terminals through a passive optical network, the data of different ONU terminals occupy different time slots, the ONU transmitting data is controlled by the OLT, and the data is transmitted in the specified time slot, so that the data transmitted by the ONU terminals connected on one optical fiber do not conflict.
The prior optical access network adopting the time division multiplexing technology only solves the access problem that one OLT device is connected with a plurality of OUN terminals, the ONUs are limited in one network and are allocated with IP addresses according to unified planning, but the access of two or more independent networks through one optical fiber cannot be met.
The scheme of time slot grouping in step 1.3 and step 2.1 includes: the original time slots are grouped, and are divided into a plurality of time slot groups when needing to be accessed into a plurality of networks, the time slot groups are divided into two time slot groups in the embodiment of the invention, one time slot group corresponds to a first network, the other time slot group corresponds to a second network, and the grouping method can adopt time slot interval grouping as shown in figure 6a, namely, each frame of even time slots is one group, each frame of odd time slots is the other group, or adopt time slot front and back grouping as shown in figure 6b, namely, the first half time slot of each frame is one group, the second half time slot of each frame is the other group, or adopt other grouping methods.
In the downlink direction, the OLT equipment respectively puts the data of the two networks into the corresponding grouping time slots and sends the data to the ONU, the ONU firstly separates the data of the first network and the second network according to the time slot grouping, then respectively processes the data, and the processing circuits of the first network and the second network respectively only process the information of the network and finally output the information to respective interfaces.
In the uplink direction, the ONU terminal puts the data which needs to be sent by the network I and the network II into the corresponding time slot after being processed by the respective circuits, the ONU terminal sends the data under the control of the OLT equipment, a sending switch is opened at a specified time slot to send the data, the OLT equipment receiving circuit firstly divides the data of different networks according to time slot grouping and sends the data to the respective processing circuits, and the processing circuits of the networks only process the data of the network.
The data temporary storage is provided for realizing two items of matching by using the first data buffer module, and the method specifically comprises the following steps: the first Ethernet receiving data cache module and the first Ethernet sending data cache module are used for temporarily storing data of a second network in the OLT equipment, and the first basic PON receiving data cache module and the first basic PON sending data cache module are used for temporarily storing data of a first network in the OLT equipment;
the data temporary storage is provided for realizing two items of matching by using the data buffer module II, and the method specifically comprises the following steps: and temporarily storing data of a second network in the ONU terminals by utilizing the second Ethernet received data cache module and the second Ethernet sent data cache module, and temporarily storing data of a first network in the ONU terminals by utilizing the second basic PON received data cache module and the first basic PON sent data cache module.
The second network adopts the first encryption and decryption module to perform encryption and decryption operations when passing between the first Ethernet processing module and the first data buffer module, the first network adopts the second encryption and decryption module to perform encryption and decryption operations when passing between the basic PON processing module and the first data buffer module, the second network adopts the third encryption module to perform encryption and decryption operations when passing between the second data buffer module and the second Ethernet processing module, and the first network adopts the fourth encryption module to perform encryption and decryption operations when passing between the second data buffer module and the ONU processing module.
The invention is based on the time slot grouping single fiber multi-network safety access equipment, the circuit structure of each function module is adopted by the existing conventional circuit structure, the purpose of the equipment is to carry out the integration improvement of the modules, simplify the equipment structure and optimize the performance.
The invention provides a single-fiber multi-network safety access device and a method based on time slot grouping, which structurally improve OLT equipment and ONU terminals, add one path of Ethernet data in the original system, the PON adopts a time division multiplexing system, the data of different terminals occupy different time slots to realize single-point to multi-point communication, the invention adopts the time slot grouping to realize multi-network multi-point access, groups the original time slots, each time slot group independently bears one network, the original PON information occupies one time slot group, the newly added Ethernet occupies one time slot group, and the original time division multiplexing channel is changed into two information channels, thereby realizing multi-network safety access, and then the multi-network isolation access can be realized by matching with an encryption and decryption module, thereby saving the cost for users, reducing the equipment usage, simplifying the network structure, improving the equipment utilization rate, and quickly opening a new system, The maintenance management is convenient, and great benefits are brought to users.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A single fiber multi-network security access device based on time slot grouping, comprising: the optical line terminal comprises OLT equipment, optical fiber splitters and ONU terminals, wherein the OLT equipment is connected with the optical fiber splitters, and each optical fiber splitter is connected with the ONU terminals;
the OLT device comprises an Ethernet processing module I (1), a basic PON processing module I (2), a data buffering module I (5), a time slot allocation extraction module I (6), a frame synthesis decomposition module I (7), a time slot grouping control module (8), a maintenance control module (9) and a newly-added PON control module (10), wherein the Ethernet processing module I (1), the data buffering module I (5), the time slot allocation extraction module I (6) and the frame synthesis decomposition module I (7) are sequentially connected, the basic PON processing module (2) is respectively connected with the data buffering module I (5) and the time slot grouping control module (8), the data buffering module I (5) is connected with the frame synthesis decomposition module I (7), and the time slot grouping control module (8) is respectively connected with the time slot allocation extraction module I (6) and the frame synthesis decomposition module I (7), the maintenance control module (9) is respectively connected with the time slot grouping control module (8) and the newly added PON control module (10), the newly added PON control module (10) is connected with the time slot distribution extraction module I (6), the basic PON processing module (2) is connected to a network I, the Ethernet processing module I (1) is connected to a network II, the maintenance control module (9) is provided with a maintenance interface, the frame synthesis decomposition module I (7) is connected with a GPON interface I (11), and the GPON interface I (11) is connected with the access end of the optical fiber splitter;
the ONU terminal comprises a second time slot distribution extraction module (14), a second frame synthesis decomposition module (15), a second data buffer module (16), a second Ethernet processing module (19) and a second ONU processing module (20), wherein the second time slot distribution extraction module (14) is connected with the second frame synthesis decomposition module (15), the second time slot distribution extraction module (14), the second data buffer module (16) and the second Ethernet processing module (19) are sequentially connected, the second frame synthesis decomposition module (15), the second data buffer module (16) and the second ONU processing module (20) are sequentially connected, the second frame synthesis decomposition module (15) is connected with a second GPON interface (12), the second ONU processing module (20), a sending control module (13) and the second GPON interface (12) are sequentially connected, the second GPON interface (12) is connected with the output end of the optical fiber splitter, and the first ONU processing module (20) outputs a first network, and the second Ethernet processing module (19) outputs a second network.
2. The single-fiber multi-network security access device based on time slot packets according to claim 1, wherein the first data buffering module (5) includes a first ethernet receiving data buffering module (501), a first ethernet sending data buffering module (502), a first basic PON receiving data buffering module (503) and a first basic PON sending data buffering module (504), the first ethernet processing module (1) is connected to the first time slot allocation extracting module (6) through the first ethernet receiving data buffering module (501) and the first ethernet sending data buffering module (502), respectively, and the basic PON processing module (2) is connected to the first frame composition decomposition module (7) through the first basic PON receiving data buffering module (503) and the first basic PON sending data buffering module (504), respectively;
the second data buffering module (16) comprises a second ethernet receiving data buffering module (1601), a second ethernet sending data buffering module (1602), a second basic PON receiving data buffering module (1603) and a second basic PON sending data buffering module (1604), the second timeslot allocation and extraction module (14) is respectively connected with the second ethernet processing module (19) through the second ethernet receiving data buffering module (1601) and the second ethernet sending data buffering module (1602), and the second frame synthesis and decomposition module (15) is respectively connected with the second ethernet processing module (20) through the second basic PON receiving data buffering module (1603) and the second basic PON sending data buffering module (1604);
the lengths of the first ethernet received data cache module (501), the first ethernet sent data cache module (502), the first basic PON received data cache module (503), the first basic PON sent data cache module (504), the second ethernet received data cache module (1601), the second ethernet sent data cache module (1602), the second basic PON received data cache module (1603) and the second basic PON sent data cache module (1604) can at least store one frame of data of the port, and the cache space is recycled.
3. The single fiber multi-network security access device based on the time slot grouping is characterized by further comprising a first encryption and decryption module (3), a second encryption and decryption module (4), a third encryption and decryption module (17) and a fourth encryption and decryption module (18);
the first encryption and decryption module (3) is arranged between the first Ethernet processing module (1) and the first data buffer module (5), one end of the first encryption and decryption module (3) is connected with the first Ethernet processing module (1), and the other end of the first encryption and decryption module (3) is respectively connected with the first Ethernet received data buffer module (501) and the first Ethernet sent data buffer module (502); the second encryption and decryption module (4) is arranged between the basic PON processing module (2) and the first data buffer module (5), one end of the second encryption and decryption module (4) is connected with the basic PON processing module (2), and the other end of the second encryption and decryption module (4) is respectively connected with the first basic PON receiving data buffer module (503) and the first basic PON sending data buffer module (504);
the encryption and decryption module III (17) is arranged between the data buffer module II (16) and the Ethernet processing module II (19), one end of the encryption and decryption module III (17) is respectively connected with the Ethernet received data buffer module II (1601) and the Ethernet sent data buffer module II (1602), and the other end of the encryption and decryption module III (17) is connected with the Ethernet processing module II (19); the encryption and decryption module four (18) is arranged between the data buffer module two (16) and the ONU processing module (20), one end of the encryption and decryption module four (18) is respectively connected with the basic PON receiving data buffer module two (1603) and the basic PON sending data buffer module two (1604), and the other end of the encryption and decryption module four (18) is connected with the ONU processing module (20);
the encryption and decryption module I (3) and the encryption and decryption module II (4) adopt different encryption modes, the encryption and decryption module III (17) and the encryption and decryption module I (3) adopt the same encryption mode, and the encryption and decryption module IV (18) and the encryption and decryption module II (4) adopt the same encryption mode.
4. The single-fiber multi-network security access device based on the timeslot packet as claimed in claim 1, wherein there are a plurality of GPON interfaces one (11), and the processing modes of the GPON interfaces one (11) are the same.
5. A single-fiber multi-network security access method based on time slot grouping, based on the single-fiber multi-network security access device based on time slot grouping of any claim 1-4, characterized in that, the information transmission between the OLT device and the ONU terminal adopts time division multiplexing mode, the time slot is divided into a plurality of time slot groups by processing the time slot grouping, different time slot groups carry different networks, the original single channel is changed into multi-channel by processing the time slot grouping, different channels transmit different networks, comprising the following steps:
step 1: the OLT equipment respectively puts the data of the network I and the network II in the corresponding time slot groups, and then sends the data to the ONU terminal through the optical fiber distributor, which specifically comprises the following steps:
step 1.1: the Ethernet processing module is externally connected to a newly added network II, data exchange processing is carried out on the network II inside the Ethernet processing module, and meanwhile the basic PON processing module is externally connected to the network I;
step 1.2: the first network and the second network send and receive data according to respective rates, when the two networks are converged into one network, two items of matching of transmission rate and receiving and sending positions are required, and a first data buffer module is utilized to provide data temporary storage for realizing the two items of matching;
step 1.3: the time slot grouping control module receives a frame synchronization signal of the basic PON processing module, generates a clock and a synchronization signal, controls the first frame synthesis and decomposition module and the first time slot distribution and extraction module to work so as to achieve the synchronization of the whole clock, receives control information of the maintenance control module at the same time, completes the time slot grouping control function, and enables the first frame synthesis and decomposition module to work according to a preset time slot grouping scheme; the newly added PON control module completes the PON management function of the network II, realizes data transmission with the original data through the GPON interface I and distributes the data to the corresponding ONU terminals;
step 1.4: according to the Ethernet, adopting packet data transmission, wherein each terminal corresponds to different IP addresses, the GPON adopts time division multiplexing data transmission, each terminal occupies different time slots, the first time slot allocation extraction module is utilized to complete the corresponding allocation between the packet data and the occupied time slots, and the data is inserted and extracted in the corresponding time slots, so that the conversion between the packet data transmission and the time division multiplexing data transmission is completed;
step 1.5: the frame synthesis and decomposition module I is used for realizing the synthesis and decomposition from two paths of data to one path of data, the synthesis is carried out in the GPON sending direction, the decomposition is carried out in the receiving direction, the information of the corresponding network is sent and received in the corresponding time slot grouping according to the control of the time slot grouping control module, a uniform information flow is formed in the GPON direction, and the information flow is divided into two different information flows in the opposite direction;
step 2: the ONU terminal firstly separates the data of the network I and the network II according to time slot grouping, then processes the data respectively, the processing circuits of the network I and the network II only process the information of the network respectively, and finally outputs the information to respective interfaces: the method specifically comprises the following steps:
step 2.1: the frame synthesis and decomposition module II is utilized to realize the synthesis and decomposition from two paths of data to one path of data, the synthesis is carried out in the GPON sending direction, the decomposition is carried out in the receiving direction, the information of the corresponding network is sent and received in the corresponding time slot grouping according to the control of the sending control module, a uniform information flow is formed in the GPON direction, and the information flow is divided into two different information flows in the opposite direction;
step 2.2: according to the Ethernet, packet data transmission is adopted, each terminal corresponds to different IP addresses, GPON adopts time division multiplexing data transmission, each terminal occupies different time slots, corresponding distribution between the packet data and the occupied time slots is completed by utilizing a time slot distribution extraction module II, and data is inserted and extracted in the corresponding time slots, so that conversion between the packet data transmission and the time division multiplexing data transmission is completed;
step 2.3: the first network and the second network send and receive data according to respective rates, when the two networks are converged into one network, two items of matching of transmission rate and receiving and sending positions are required, and a data buffer module II is utilized to provide data temporary storage for realizing the two items of matching;
step 2.4: the Ethernet processing module II outputs a newly added network II to the outside, performs data exchange processing on the network II inside, and simultaneously the ONU processing module outputs the network I.
6. The method for single fiber multi-network security access based on time slot grouping according to claim 5, wherein the scheme of the time slot grouping in step 1.3 and step 2.1 comprises: the original time slots are divided into two time slot groups, one time slot group corresponds to a first network, the other time slot group corresponds to a second network, the grouping method adopts time slot interval grouping, namely each frame of even time slots is one group, each frame of odd time slots is the other group, or adopts time slot front and back grouping, namely the first half time slot of each frame is one group, and the second half time slot of each frame is the other group.
7. The timeslot-based packet single-fiber multi-network security access method according to claim 5, wherein the first data buffering module is used to provide data temporary storage for implementing two matching operations, and specifically includes:
the first Ethernet receiving data cache module and the first Ethernet sending data cache module are used for temporarily storing data of a second network in the OLT equipment, and the first basic PON receiving data cache module and the first basic PON sending data cache module are used for temporarily storing data of a first network in the OLT equipment;
the data temporary storage is provided for realizing two items of matching by using the data buffer module II, and the method specifically comprises the following steps: and temporarily storing data of a second network in the ONU terminals by utilizing the second Ethernet received data cache module and the second Ethernet sent data cache module, and temporarily storing data of a first network in the ONU terminals by utilizing the second basic PON received data cache module and the first basic PON sent data cache module.
8. The timeslot-packet-based single-fiber multi-network secure access method according to claim 5, wherein the second network performs the encryption and decryption operations using a first encryption/decryption module when passing between the first ethernet processing module and the first data buffering module, the first network performs the encryption and decryption operations using a second encryption/decryption module when passing between the basic PON processing module and the first data buffering module, the second network performs the encryption and decryption operations using a third encryption module when passing between the second data buffering module and the second ethernet processing module, and the first network performs the encryption and decryption operations using a fourth encryption module when passing between the second data buffering module and the ONU processing module.
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| US20080056721A1 (en) * | 2006-09-01 | 2008-03-06 | Fujitsu Limited | Multiple bit rate optical communication method, optical network unit and optical line terminal |
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| CN1731750A (en) * | 2005-08-16 | 2006-02-08 | 长飞光纤光缆有限公司 | FTTX information transmission network system merged by multi-network |
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