CN110351613B - Time slot and packet mixed transmission, sending, receiving and switching method in optical network - Google Patents
Time slot and packet mixed transmission, sending, receiving and switching method in optical network Download PDFInfo
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- CN110351613B CN110351613B CN201910625334.0A CN201910625334A CN110351613B CN 110351613 B CN110351613 B CN 110351613B CN 201910625334 A CN201910625334 A CN 201910625334A CN 110351613 B CN110351613 B CN 110351613B
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- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04Q11/0005—Switch and router aspects
- H04Q2011/0007—Construction
- H04Q2011/0033—Construction using time division switching
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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
- H04Q2011/0077—Labelling aspects, e.g. multiprotocol label switching [MPLS], G-MPLS, MPAS
Abstract
The invention discloses a time slot and packet hybrid transmission, receiving, sending and switching method in an optical network, which divides a single wavelength transmission channel or a combination of a plurality of wavelength channels in an optical fiber into a transmission cycle with fixed time length, and consists of an optical time slot transmission time period and an optical packet transmission time period. In the optical time slot transmission time period, the system is used for transmitting periodic service data and adopting optical time slot transmission, receiving, sending and switching; and in the optical packet transmission time period, the method is used for transmitting burst service data and adopting optical packet transmission, receiving, sending and switching. The invention sets the proportion of the optical time slot transmission time period and the optical packet transmission time period in the transmission period according to the proportion of the optical network period and the burst service data volume, and realizes the allocation of channel transmission resources according to the service volume. The invention realizes the simultaneous transmission, sending, receiving and exchange of the time slot and the grouping of the single wavelength channel in the optical network, improves the network throughput of the periodic and burst mixed service, and reduces the packet loss rate and the time delay.
Description
Technical Field
The invention belongs to the technical field of optical fiber communication, and particularly relates to a time slot and packet hybrid transmission, sending, receiving and switching method in an optical network.
Background
With the development of emerging technologies such as internet of things, cloud computing, 5G communication and the like, the types of services and data volume carried by an optical network are rapidly increasing. The mode of optical transmission and electrical switching in the conventional optical network is increasingly influenced by the electronic switching rate, capacity and energy consumption, and becomes a bottleneck in the development of the optical network. The optical switching instead of the electrical switching is a trend of optical network development, and becomes a research hotspot in the field of optical communication.
Currently, optical switching technologies can be divided into optical wavelength switching, optical burst switching, optical packet switching, and optical slot switching, among which:
optical Packet Switching (OPS) adopts a mode similar to electric Packet Switching, and performs independent transmission and Switching by using fixed or variable-length Optical packets, so that the OPS has the characteristics of supporting burst service transmission and high transmission statistical multiplexing rate; however, due to port competition in the random sending and switching processes of the optical packet, certain packet loss rate and delay jitter exist, and the requirement of periodic service communication with high real-time requirement cannot be met.
An Optical Time Slot Switching (OTSS) divides a transmission channel into Time slices of fixed length, allocates the Time slices to a data transmitting and receiving end, ensures that the data transmitting and receiving end monopolizes the Time slices, performs Switching according to the predefined Time slices, and avoids channel contention. (Zhuizhen Zhong et al, evolution optical networks for relationship-sensitive small-grid communication, Optical Time Slice Switching (OTSS) technologies, 2017 Opto-Electronics and Communications Conference (OECC) and Photonics Global Conference (PGC)). And corresponding time slices are allocated to the data generation period of the periodic service, so that the reliability of transmission and the certainty of time delay can be ensured. However, the time slice allocation is fixed, and the time consumption for recovering and redistributing the time slice is long, so that the time slice can not be used by other terminals when the time slice is idle; and the time slice length is fixed, but when the sent data is inconsistent with the time slice length, the transmission is idle or cannot be completed at one time, so that the channel utilization rate of the OTSS is low for burst services.
Meanwhile, in the switching process of the OPS, the OPS needs to identify, update and search a forwarding table for a packet header/label of each optical packet, so as to solve port competition, and the OTSS only needs to implement synchronous fixed time slot switching according to the time slot switching table, so that the switching method of the OPS and the switching method of the OTSS have a great difference. Therefore, current optical switching networks are all single supporting OPS or OTSS, resulting in difficulty in efficiently carrying both bursty and periodic mixed traffic.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a time slot and packet hybrid transmission method, a sending and receiving method and a switching method in an optical network so as to realize high-performance transmission, sending and receiving and switching of burst and periodic hybrid services.
In order to achieve the above object, the present invention provides a method for hybrid transmission of timeslots and packets in an optical network, which is characterized by comprising the following steps:
(1) the method comprises the steps of dividing a single wavelength channel or a combination of a plurality of wavelength channels in an optical fiber into transmission cycles with fixed time lengths, and dividing each cycle into an optical time slot transmission time period and an optical packet transmission time period, wherein the optical time slot transmission time period is divided into a plurality of equal-length time slots for transmitting optical time slot signals; the method is used for random access transmission of fixed or variable-length optical packets in an optical packet transmission time period;
(2) the whole optical network uses the same transmission cycle, time slot transmission time slot and packet transmission time slot, and the transmission cycle of the whole optical network is synchronous;
(3) the periodic service is distributed to the transmission time period of the optical time slot for transmission, and the burst service is distributed to the transmission time period of the optical packet for transmission;
(4) and the proportion of the optical time slot transmission time period to the optical packet transmission time period in the transmission period is equal to the proportion of the total data volume of the optical network period service and the burst service.
The invention also provides a time slot and packet mixed sending and receiving method in an optical network, which is characterized by comprising the following steps:
(1) the master control module receives a synchronous clock and a periodic configuration signal from a network, enables the time slot processing module and the closing grouping processing module, the optical label inserting module and the optical label extracting module in the time slot transmission time period, and enables the optical signals to pass through the closed optical label inserting module and the closed optical label extracting module; enabling a packet processing module, an optical label inserting module, an optical label extracting module and a closing time slot processing module in an optical packet transmission time period;
(2) business data to be sent are respectively stored in a periodic data cache and a burst data cache through a business data scheduling module according to periodic business and burst business; in the optical packet transmission time period, the packet processing module extracts burst data to be sent from a burst data cache and encapsulates the burst data into a payload signal, drives an optical transmitter to generate an optical payload signal, searches a label forwarding table according to a destination address of the data to obtain a label signal, outputs the label signal to an optical label insertion module, inserts an optical label (label signal) into the optical payload signal through the optical label insertion module to obtain an optical packet signal, and sends the optical packet signal to an optical network; in the time slot transmission time period, the time slot processing module extracts periodic data to be sent from the periodic data cache and packages the periodic data into a time slot transmission signal, drives an optical transmitter to generate an optical time slot signal and sends the optical time slot signal to an optical network;
(3) after business data needing to be received is input through an optical network, in an optical packet transmission time period, an optical packet signal input by the optical network is subjected to optical label extraction module to separate a label signal and an optical payload signal, the label signal is input into a packet processing module, the optical payload signal is input into an optical receiver, the payload signal obtained by recovery of the optical receiver is input into the packet processing module, the packet processing module searches a label forwarding table according to the label signal to judge whether the payload signal is locally received, if the payload signal is locally received, the payload signal is unpacked into burst data and stored into a burst data cache, and if the payload signal is not locally received, transmission error processing is started; in the optical time slot transmission time period, an optical time slot signal input by an optical network is recovered by an optical receiver to obtain a time slot transmission signal, the time slot transmission signal is sent to a time slot processing module, and the time slot transmission signal is unpacked into periodic data by the time slot processing module and stored in a periodic data cache; and the service data scheduling module extracts the burst data and the periodic data from the burst data cache and the periodic data cache and sends the burst data and the periodic data to corresponding application services.
The invention also provides a time slot and packet mixed switching method in an optical network, which is characterized by comprising the following steps:
(1) the main control module receives a synchronous clock and a periodic configuration signal from a network, enables an OTSS (optical time slot switching) scheduling module and closes an OPS (optical packet switching) scheduling module, an optical label extraction module and an optical label insertion module in an optical time slot transmission time period, and optical signals pass through the closed optical label extraction module and the closed optical label insertion module transparently; enabling an OPS scheduling module, an optical label extraction module, an optical label insertion module and a closed OTSS scheduling module in an optical packet transmission time period;
(2) and in the optical time slot transmission time period, adopting OTSS to carry out switching: optical signals from input optical fibers of the optical network are separated into various wavelength channels through a wavelength division demultiplexer, an OTSS scheduling module configures ports of an optical switching matrix to be connected through a control signal according to the port interconnection relationship of various time slots in a time slot scheduling table, the optical time slot signals of various input wavelength channels are output to corresponding output ports of the optical switching matrix through the configured optical switching matrix, and enter the optical network through the output optical fibers through the wavelength division multiplexer;
(3) and in the optical packet transmission time period, switching by adopting an OPS (optical packet service): an optical signal from an optical network input optical fiber is separated into each wavelength channel through a wavelength division demultiplexer, each input wavelength optical packet is separated into an optical label (label signal) and an optical payload signal through an optical label extraction module, the label signal is extracted and input into an OPS scheduling module, the optical payload signal is input into an optical switching matrix and a competition solving unit, the OPS scheduling module searches a label forwarding table according to the label information of each input wavelength to obtain an output port and an output optical label (label information) of each packet, decides the port interconnection relationship of the optical switching matrix, configures the port connection of the optical switching matrix through a control signal, and sends the optical label (label information) to an optical label insertion module; the input optical payload signal is output to the corresponding optical switching matrix output port through the configured optical switching matrix, an optical label signal is added through an optical label insertion module to form a new optical packet signal, and the new optical packet signal enters an optical network through a wavelength division multiplexer and an output optical fiber.
The object of the invention is thus achieved.
The invention relates to a time slot and packet hybrid transmission, sending, receiving and switching method in an optical network, which divides a single wavelength transmission channel or a combination of a plurality of wavelength channels in an optical fiber into transmission cycles with fixed time length, and each transmission cycle consists of two parts, namely an optical time slot transmission time period and an optical packet transmission time period. In the optical time slot transmission time period, the system is used for transmitting periodic service data and adopting optical time slot transmission, sending, receiving and exchange; and in the optical packet transmission time period, the method is used for transmitting burst service data and adopting optical packet transmission, sending, receiving and switching. The invention sets the proportion of the optical time slot transmission time period and the optical packet transmission time period in the transmission period according to the proportion of the optical network period and the burst service data volume, and realizes the allocation of channel transmission resources according to the service volume. The network edge node designed by the invention realizes the mixed sending and receiving of time slots and packets, and the network switching node designed by the invention realizes the mixed switching of optical time slot switching and optical packet switching. The invention realizes the simultaneous transmission, sending, receiving and exchange of the time slot and the grouping of the single wavelength channel in the optical network, improves the network throughput of the periodic and burst mixed service, and reduces the packet loss rate and the time delay.
Drawings
Fig. 1 is a schematic diagram of an embodiment of a hybrid transmission method for timeslots and packets in an optical network according to the present invention;
fig. 2 is a schematic diagram of a hybrid transmission and reception method for time slots and packets in an optical network according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an embodiment of a hybrid time slot and packet switching method in an optical network according to the present invention;
FIG. 4 is a diagram of a subcarrier tag optical packet spectrum;
FIG. 5 is a schematic illustration of optical label insertion;
FIG. 6 is a schematic diagram of optical label extraction;
fig. 7 is a diagram illustrating an example of switching of a time slot and packet mixed signal.
Detailed Description
The following description of the embodiments of the present invention is provided in order to better understand the present invention for those skilled in the art with reference to the accompanying drawings. It is to be expressly noted that in the following description, a detailed description of known functions and designs will be omitted when it may obscure the subject matter of the present invention.
Fig. 1 is a schematic diagram of an embodiment of a hybrid transmission method of time slots and packets in an optical network according to the present invention.
In this embodiment, as shown in fig. 1, the method for hybrid transmission of timeslots and packets in an optical network according to the present invention includes the following steps:
step S1: for a single wavelength (lambda) in an optical fibrei) Channel or channels of multiple wavelengths (lambda)i,...λi+k) Is divided into two parts, namely an optical time slot transmission time section and an optical packet transmission time section, in each period, wherein in the optical time slot transmission time section, the transmission time section is divided into a plurality of equal-length time slots (optical time slots) for transmitting optical time slot signals(ii) a The method is used for random access transmission of fixed or variable-length optical packets in an optical packet transmission time period;
step S2: the whole optical network uses the same transmission cycle, time slot transmission time slot and packet transmission time slot, and the transmission cycle of the whole optical network is synchronous;
step S3: the periodic service is distributed to the optical time slot transmission time period for transmission, and the burst service is distributed to the optical packet transmission time period for transmission;
step S4: the ratio of the optical time slot transmission time period to the optical packet transmission time period in the transmission period is equal to the ratio of the total data volume of the optical network period service and the burst service.
Fig. 2 is a schematic diagram of a specific embodiment of a method for hybrid transmission and reception of time slots and packets in an optical network according to the present invention.
In this embodiment, as shown in fig. 2, the method for hybrid transmission and reception of timeslots and packets in an optical network according to the present invention includes the following steps:
step S1: the master control module receives a synchronous clock and a periodic configuration signal from a network, enables the time slot processing module and the closing grouping processing module, the optical label inserting module and the optical label extracting module in the time slot transmission time period, and enables the optical signals to pass through the closed optical label inserting module and the closed optical label extracting module; enabling a packet processing module, an optical label inserting module, an optical label extracting module and a closing time slot processing module in an optical packet transmission time period;
step S2: service data to be sent are respectively stored in a periodic data cache and a burst data cache through a service data scheduling module according to periodic services and burst services; in the optical packet transmission time period, the packet processing module extracts burst data to be sent from a burst data cache and encapsulates the burst data into a payload signal, drives an optical transmitter to generate an optical payload signal, searches a label forwarding table according to a destination address of the data to obtain a label signal, outputs the label signal to an optical label insertion module, inserts an optical label (label signal) into the optical payload signal through the optical label insertion module to obtain an optical packet signal, and sends the optical packet signal to an optical network; in the time slot transmission time period, the time slot processing module extracts periodic data to be sent from the periodic data cache and packages the periodic data into a time slot transmission signal, drives an optical transmitter to generate an optical time slot signal and sends the optical time slot signal to an optical network;
step S3: after service data needing to be received is input through an optical network, in an optical packet transmission time period, an optical packet signal input by the optical network is subjected to optical label extraction module to separate a label signal and an optical payload signal, the label signal is input into a packet processing module, the optical payload signal is input into an optical receiver, the payload signal obtained by recovery of the optical receiver is input into the packet processing module, the packet processing module searches a label forwarding table according to the label signal to judge whether the payload signal is locally received, if the payload signal is locally received, the payload signal is unpacked into burst data and stored into a burst data cache, and if the payload signal is not locally received, transmission error processing is started; in the optical time slot transmission time period, an optical time slot signal input by an optical network is recovered by an optical receiver to obtain a time slot transmission signal, the time slot transmission signal is sent to a time slot processing module, and the time slot transmission signal is unpacked into periodic data by the time slot processing module and stored in a periodic data cache; and the service data scheduling module extracts the burst data and the periodic data from the burst data cache and the periodic data cache and sends the burst data and the periodic data to corresponding application services.
Fig. 3 is a schematic diagram of an embodiment of a method for hybrid switching of timeslots and packets in an optical network according to the present invention.
In this embodiment, as shown in fig. 3, the method for hybrid switching of timeslots and packets in an optical network according to the present invention includes the following steps:
step S1: the main control module receives a synchronous clock and a periodic configuration signal from a network, enables an OTSS (optical time slot switching) scheduling module and closes an OPS (optical packet switching) scheduling module, an optical label extraction module and an optical label insertion module in an optical time slot transmission time period, and optical signals pass through the closed optical label extraction module and the closed optical label insertion module transparently; enabling an OPS scheduling module, an optical label extraction module, an optical label insertion module and a closed OTSS scheduling module in an optical packet transmission time period;
step S2: in the optical time slot transmission time period, switching is performed by adopting OTSS: optical signals from input optical fibers of the optical network are separated into various wavelength channels through a wavelength division demultiplexer, an OTSS scheduling module configures ports of an optical switching matrix to be connected through a control signal according to the port interconnection relationship of various time slots in a time slot scheduling table, the optical time slot signals of various input wavelength channels are output to corresponding output ports of the optical switching matrix through the configured optical switching matrix, and enter the optical network through the output optical fibers through the wavelength division multiplexer;
step S3: in the optical packet transmission time period, switching is performed by using an OPS: an optical signal from an optical network input optical fiber is separated into each wavelength channel through a wavelength division demultiplexer, each input wavelength optical packet is separated into an optical label (label signal) and an optical payload signal through an optical label extraction module, the label signal is extracted and input into an OPS scheduling module, the optical payload signal is input into an optical switching matrix and a competition solving unit, the OPS scheduling module searches a label forwarding table according to the label information of each input wavelength to obtain an output port and an output optical label (label information) of each packet, decides the port interconnection relationship of the optical switching matrix, configures the port connection of the optical switching matrix through a control signal, and sends the optical label (label information) to an optical label insertion module; the input optical payload signal is output to the corresponding optical switching matrix output port through the configured optical switching matrix, an optical label signal is added through an optical label insertion module to form a new optical packet signal, and the new optical packet signal enters an optical network through a wavelength division multiplexer and an output optical fiber.
The design is assumed that the proportion of periodic traffic and burst traffic of a certain optical network is 60% and 40%.
The size of one transmission period is set. The size of the transmission period can be set according to the maximum delay time that can be tolerated by the service, and the transmission period is set to be less than the maximum delay time of the service, which is assumed to be set to be 1 ms.
1) The ratio of the slot transmission period to the packet transmission period in one transmission cycle is equal to the ratio of the cycle to the burst traffic, and thus the slot transmission period is 600 mus and the packet transmission period is 400 mus. Assuming that 100 slots are divided in the slot transmission period, each slot size is 6 mus.
2) And completing network routing and link bandwidth allocation according to the bandwidth requirement from the source end to the destination end of each period of service. And allocating transmission time slots according to the link bandwidth occupied by each period of service. Since the slot transmission period occupies 60% of the total link bandwidth and comprises 100 slots, the link bandwidth occupied by each slot is 0.6%. If a certain periodic service needs to occupy 1% of bandwidth, two time slots need to be allocated to the service, and the periodic service fixedly adopts the two time slots to transmit data. Burst traffic may be sent randomly during the packet transmission period.
3) Time slot and packet mixed signal transmission and reception is implemented according to fig. 2, wherein burst data buffering and periodic data buffering are adopted to set transmission queues for each transmission service, thereby supporting round robin or priority transmission and reception.
It is assumed that the optical packet signal is in subcarrier label format, i.e. the optical label is modulated by subcarriers and the payload is modulated by baseband, and the two are spectrally separated as shown in fig. 4. According to the sub-carrier label optical packet format, the optical label insertion module is designed as shown in fig. 5, and the input label signal adopts the frequency fscThe microwave signal is modulated to generate a subcarrier label signal, and the subcarrier label signal is further modulated to a frequency f by an optical modulator0And finally, the optical wave is coupled with the optical payload signal through a 2 x 1 optical coupler and then output to form an optical packet signal of the subcarrier tag. The optical label extraction module is designed as shown in fig. 6, and utilizes the characteristic that the optical label and the optical payload are separated on the frequency spectrum, and adopts an optical filter to separate the optical label, the optical label signal is converted into an electrical label signal through optical detection, and the function of the optical filter can be realized by adopting a Fiber Bragg Grating (FBG) in specific implementation.
The optical time gap signal is modulated by the same optical wave frequency and baseband as the optical payload signal, so that the optical label insertion module and the optical label extraction module can be ensured to be transparent.
The switching of the time slot and packet mixed signals is implemented using fig. 3. The optical switching matrix is realized by adopting a commercial MxM optical switch according to the switching speed requirement, and the competition solving unit is realized by adopting the existing optical Fiber Delay Line (FDL), wavelength conversion and deflection routing technology. Example of the switching function of the time slot and packet mixed signal is shown in fig. 7, the optical packets P1 and P2 complete port switching in the packet transmission period, and the optical slots T1, T2 and T3 complete port switching in the time slot transmission period.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all matters of the invention which utilize the inventive concepts are protected.
Claims (3)
1. A method for hybrid transmission of time slots and packets in an optical network, comprising the steps of:
(1) dividing a single wavelength channel or a combination of a plurality of wavelength channels in the optical fiber into transmission cycles with fixed time lengths, dividing the transmission cycles into an optical time slot transmission time period and an optical packet transmission time period in each transmission cycle, and setting the proportion of the optical time slot transmission time period and the optical packet transmission time period in the transmission cycle according to the proportion of the optical network cycle and the burst service data volume;
in the optical time slot transmission time period, the system is used for transmitting periodic service data and adopting optical time slot transmission, sending, receiving and exchange; in the optical packet transmission time period, the optical packet transmission time period is used for transmitting burst service data and adopting optical packet transmission, sending, receiving and switching, wherein in the optical time slot transmission time period, the optical packet transmission time period is divided into a plurality of equal-length time slots for transmitting optical time slot signals; the method is used for random access transmission of fixed or variable-length optical packets in an optical packet transmission time period;
(2) the whole optical network uses the same transmission cycle, time slot transmission time slot and packet transmission time slot, and the transmission cycle of the whole optical network is synchronous;
(3) and the periodic service is distributed to the transmission of the optical time slot transmission time period, and the burst service is distributed to the transmission of the optical packet transmission time period.
2. A method for hybrid transmitting and receiving time slot and packet in optical network is characterized in that the method comprises the following steps:
(1) the master control module receives a synchronous clock and a periodic configuration signal from a network, enables the time slot processing module and the closing grouping processing module, the optical label inserting module and the optical label extracting module in the time slot transmission time period, and enables the optical signals to pass through the closed optical label inserting module and the closed optical label extracting module; enabling a packet processing module, an optical label inserting module, an optical label extracting module and a closing time slot processing module in an optical packet transmission time period;
(2) business data to be sent are respectively stored in a periodic data cache and a burst data cache through a business data scheduling module according to periodic business and burst business; in the optical packet transmission time period, the packet processing module extracts burst data to be sent from a burst data cache and encapsulates the burst data into a payload signal, drives an optical transmitter to generate an optical payload signal, searches a label forwarding table according to a destination address of the data to obtain a label signal, outputs the label signal to an optical label insertion module, inserts the label signal into the optical payload signal through the optical label insertion module to obtain an optical packet signal, and sends the optical packet signal to an optical network; in the time slot transmission time period, the time slot processing module extracts periodic data to be sent from the periodic data cache and packages the periodic data into a time slot transmission signal, drives an optical transmitter to generate an optical time slot signal and sends the optical time slot signal to an optical network;
(3) after business data needing to be received is input through an optical network, in an optical packet transmission time period, an optical packet signal input by the optical network is subjected to optical label extraction module to separate a label signal and an optical payload signal, the label signal is input into a packet processing module, the optical payload signal is input into an optical receiver, the payload signal obtained by recovery of the optical receiver is input into the packet processing module, the packet processing module searches a label forwarding table according to the label signal to judge whether the payload signal is locally received, if the payload signal is locally received, the payload signal is unpacked into burst data and stored into a burst data cache, and if the payload signal is not locally received, transmission error processing is started; in the optical time slot transmission time period, an optical time slot signal input by an optical network is recovered by an optical receiver to obtain a time slot transmission signal, the time slot transmission signal is sent to a time slot processing module, and the time slot transmission signal is unpacked into periodic data by the time slot processing module and stored in a periodic data cache; and the service data scheduling module extracts the burst data and the periodic data from the burst data cache and the periodic data cache and sends the burst data and the periodic data to corresponding application services.
3. A method for hybrid switching of timeslots and packets in an optical network, comprising the steps of:
(1) the main control module receives a synchronous clock and a periodic configuration signal from a network, enables an OTSS (optical time slot switching scheduling module) and closes an OPS (optical packet switching) scheduling module, an optical label extraction module and an optical label insertion module in an optical time slot transmission time period, and optical signals pass through the closed optical label extraction module and the closed optical label insertion module transparently; enabling an OPS scheduling module, an optical label extraction module, an optical label insertion module and a closed OTSS scheduling module in an optical packet transmission time period;
(2) and in the optical time slot transmission time period, adopting OTSS to carry out switching: optical signals from input optical fibers of the optical network are separated into various wavelength channels through a wavelength division demultiplexer, an OTSS scheduling module configures ports of an optical switching matrix to be connected through a control signal according to the port interconnection relationship of various time slots in a time slot scheduling table, the optical time slot signals of various input wavelength channels are output to corresponding output ports of the optical switching matrix through the configured optical switching matrix, and enter the optical network through the output optical fibers through the wavelength division multiplexer;
(3) and in the optical packet transmission time period, switching by adopting an OPS (optical packet service): an optical signal from an optical network input optical fiber is separated into each wavelength channel through a wavelength division demultiplexer, each input wavelength optical packet is separated into a label signal and an optical payload signal through an optical label extraction module, the label signal is extracted and input into an OPS scheduling module, the optical payload signal is input into an optical switching matrix and a competition resolving unit, the OPS scheduling module searches a label forwarding table according to label information of each input wavelength to obtain an output port and an output label signal of each packet, decides the port interconnection relation of the optical switching matrix, configures the port connection of the optical switching matrix through a control signal, and sends the label signal to an optical label insertion module; the input optical payload signal is output to a corresponding optical switching matrix output port through the configured optical switching matrix, a tag signal is added through an optical tag insertion module to form a new optical packet signal, and the new optical packet signal enters an optical network through a wavelength division multiplexer and an output optical fiber.
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| CN107343231A (en) * | 2017-09-04 | 2017-11-10 | 南京曦光信息科技有限公司 | Asymmetric caching and forwarding module and the Packet Switch Node and network that are made from it |
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| CN110351613A (en) | 2019-10-18 |
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