CN1104789C - Method and device for integrating ATM services with STM services - Google Patents
Method and device for integrating ATM services with STM services Download PDFInfo
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- CN1104789C CN1104789C CN99121940A CN99121940A CN1104789C CN 1104789 C CN1104789 C CN 1104789C CN 99121940 A CN99121940 A CN 99121940A CN 99121940 A CN99121940 A CN 99121940A CN 1104789 C CN1104789 C CN 1104789C
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Abstract
The present invention relates to a method for synthesizing asynchronous transfer mode service and synchronous transfer mode service. The method is characterized in that the synchronous transfer mode (STM) service is not adapted in an asynchronous transfer mode (ATM) in an asynchronous transfer mode cell adaptative layer (AAL); instead, both STM service signals and ATM cells are mapped to a broadband passive optical network (PON) frame in a transmission convergence (TC) sublayer. A device using the method of the present invention is composed of a downward transmitting circuit of an optical line terminal (OLT), an upward receiving circuit of the OLT, an upward transmitting circuit of an optical network unit (ONU), a downward receiving circuit of the ONU and an optical distribution network; the device has the advantages of simple structure, low cost and improved performance, and the utilization ratio of transmission bandwidth is raised.
Description
The present invention relates to communication technical field, the method and apparatus of comprehensive Asynchronous Transfer Mode ATM business and Synchronous Transfer Mode STM business on Transmission Convergence TC (Transmission Convergence) sublayer that is specifically related at broadband passive optical network PON (PassiveOptical Network).
G.983, the EPON ATM PON based on Asynchronous Transfer Mode that present broadband P ON and ITU are advised is all business information (circuit-mode and group mode) that adopt between pure ATM cell mode transport service network interface SNI (Service NetworkInterface) and the User Network Interface UNI (User Network Interface).The circuit-mode business is according to the practice of broadband integrated services digital network B_ISDN access technology, it is adaptive that the ATM cell adaptation layer AAL layer of employing on the ATM layer made ATM, the circuit-mode business is adapted to ATM cell (so-called circuit simulation), becomes the PON frame in broadband P ON, to transmit then.
About the simulation technology atm forum standard having been proposed---af-vtoa-0078.000, ITU have also proposed related advisory---I.363.1.As adopt simulation technology, professional just to need to make ATM respectively at the optical line terminal OLT (Optical LineTerminal) of broadband P ON and optical network unit ONU (Optical Network Unit) two places adaptive for bearer mode in broadband P ON.This practice can make service feature sustain damage inevitably, and cost increases, and also has degradation shortcoming under the PON bandwidth availability ratio in addition.
Main purpose of the present invention is: a kind of new comprehensive transmission ATM business and the method and apparatus of STM business are provided, to improve the transmission system bandwidth availability ratio, improve service transmission performance, reduce cost.
The invention provides a kind of method that is used on the broadband passive optical network transmission convergence layer comprehensive Asynchronous Transfer Mode and Synchronous Transfer Mode business, wherein broadband passive optical network PON hierarchy is such: top is the upper-layer protocol of service-oriented application; Be circuit-mode CM (CIRCUIT MODE) layer below the upper-layer protocol of Synchronous Transfer Mode STM business, this circuit-mode layer is responsible for finishing multiplexing, cross connect function; Group mode circuit-mode business professional and/or that make circuit simulation is referred to as Asynchronous Transfer Mode ATM business, be the adaptive AAL layer of Asynchronous Transfer Mode ATM cell below the upper-layer protocol of Asynchronous Transfer Mode business, finish that high layer information is adapted to the Asynchronous Transfer Mode ATM cell and the Asynchronous Transfer Mode ATM cell reassembles into the high-level protocol information form; Be Asynchronous Transfer Mode ATM layer below the adaptive AAL layer of described Asynchronous Transfer Mode ATM cell, be responsible for carry out multiplexed, the interconnection of Asynchronous Transfer Mode ATM cell, generation and the extraction and the general flow control function of letter head; Described Asynchronous Transfer Mode ATM layer and described circuit-mode CM layer are downwards to assemble the TC sublayer towards the transmission of broadband passive optical network PON physical layer side by side, finish bit, byte, frame synchronization and burst synchronization, range finding, allocated bandwidth and security guarantee function; Be the physical medium sublayer below the described Transmission Convergence Sub-layer, carry out light/electric conversion, wavelength multiplexing, optical fiber linkage function.It is adaptive that the Synchronous Transfer Mode business is not made Asynchronous Transfer Mode ATM in described Asynchronous Transfer Mode cell adaptation layer, directly the Asynchronous Transfer Mode ATM cell of Synchronous Transfer Mode STM service signal and Asynchronous Transfer Mode ATM business is mapped in the broadband passive optical network PON frame together and assemble the TC sublayer in described transmission; Wherein said broadband passive optical network PON frame is made up of Synchronous Transfer Mode STM time slot and Asynchronous Transfer Mode ATM cell and physical layer overhead; The frame length of described broadband passive optical network PON frame is n a times of 125 μ s, and n is a positive integer; The clock of described broadband passive optical network PON and the business network interface SNI clock synchronization that Synchronous Transfer Mode STM service signal is provided.
During transmission, the STM signal is cached in STM first-in first-out fifo queue, and the ATM service signal is cached in ATM first-in first-out fifo queue, the output of these two formations regularly is read into the transmit queue of broadband P ON so that form broadband P ON frame under the control that transmits control signal that produces according to broadband P ON frame structure, finish the comprehensive of ATM signal and STM signal, its output further processing through fail safe and physical medium sublayer transfers to receiving terminal; After the processing of physical medium sublayer and fail safe, obtain ATM and STM integrated signal at receiving terminal, by the reception control signal control that produces according to broadband P ON frame structure the STM signal is read into STM and receive fifo queue, ATM cell reads into ATM and receives fifo queue, finishes separating of STM and ATM signal.The transmission of circuit-mode business is that the time slot with a length n byte is a unit, is called the STM time slot, and n is a positive integer; At the PON system clock of OLT generation with the clock synchronization of the SNI that the circuit-mode business is provided, ONU extracts clock from the signal flow that OLT transmits.STM timeslot number in each PON frame and position thereof are by the system management assignment, and total how many STM time slots of each ONU and position thereof are also by the system management assignment.
The present invention also provides the comprehensive ATM on Transmission Convergence TC sublayer of employing said method and the passive optical network PON device A CTC PON of STM business, described equipment is made up of optical line terminal OLT and optical network unit ONU and tree-like optical distribution network ODN, wherein said optical line terminal OLT is made up of descending transtation mission circuit of OLT and the up receiving circuit of OLT, and described optical network unit ONU is made up of up transtation mission circuit of ONU and the descending receiving circuit of ONU; Wherein when sending, Synchronous Transfer Mode STM signal is cached in Synchronous Transfer Mode STM and sends among the FIFO, and Asynchronous Transfer Mode ATM service signal is cached among the Asynchronous Transfer Mode ATM transmission FIFO, its output regularly is read into the transmit queue of broadband passive optical network PON under the control that transmits control signal that sending controling circuit produces according to broadband passive optical network PON frame structure, so that form broadband passive optical network PON frame, thereby obtain the integrated signal of Asynchronous Transfer Mode ATM signal and Synchronous Transfer Mode STM signal.
It is adaptive that the STM signal is not made AAL, become the PON frame but directly be input to descending transmission FIFO by frame structure with ATM cell, this frame structure professional at the comprehensive ATM of PON TC layer and the circuit-mode business is called the ACTC_PON frame by us, and is simple in structure, and cost is low and improved performance.For example, the STM signal in the propagation delay time of ACTC_PON less than 250 μ s, much smaller than the time delay of circuit simulation mode, and irrelevant with bandwidth availability ratio, the contradiction when having solved the circuit simulation mode between propagation delay time and the bandwidth availability ratio.Moreover, owing to there is not ATM adaptive, just there is not the letter header overhead of ATM cell yet, therefore, the transmission bandwidth utilance of ACTC_PON is than the ATM_PON height based on pure ATM cell.
Owing to adopt technique scheme, can solve cost-effectively the circuit-mode business in broadband P ON with the comprehensive access of ATM business, performance and price compare circuit-mode professional insert by circuit simulation high.
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the hierarchical mode figure of ACTC_PON of the present invention
Fig. 2 a is the electric theory diagram of down direction of the present invention
Fig. 2 b is the electric theory diagram of up direction of the present invention
Fig. 3 is the frame assumption diagram of first embodiment of the present invention
Fig. 4 is the frame assumption diagram of second embodiment of the present invention.
The present invention from the hierarchical mode angle of Fig. 1 explanation is transfer circuit mode business and ATM business how.Broadband passive optical network PON hierarchy is such: top is the upper-layer protocol that service-oriented is used; Be circuit-mode CM layer below the upper-layer protocol of Synchronous Transfer Mode STM business, this circuit-mode layer is responsible for finishing multiplexing, cross connect function; Group mode circuit-mode business professional and/or that make circuit simulation is referred to as Asynchronous Transfer Mode ATM business, be the adaptive AAL layer of Asynchronous Transfer Mode ATM cell below the upper-layer protocol of Asynchronous Transfer Mode business, finish that high layer information is adapted to the Asynchronous Transfer Mode ATM cell and the Asynchronous Transfer Mode ATM cell reassembles into the high-level protocol information form; Be Asynchronous Transfer Mode ATM layer below the adaptive AAL layer of described Asynchronous Transfer Mode ATM cell, be responsible for carry out multiplexed, the interconnection of Asynchronous Transfer Mode ATM cell, generation and the extraction and the general flow control function of letter head; Described Asynchronous Transfer Mode ATM layer and described circuit-mode CM layer are downwards to assemble the TC sublayer towards the transmission of broadband passive optical network PON physical layer side by side, finish bit, byte, frame synchronization and burst synchronization, range finding, allocated bandwidth and security guarantee function; Be the physical medium sublayer below the described Transmission Convergence Sub-layer, carry out light/electric conversion, wavelength multiplexing, optical fiber linkage function.
It is adaptive that the Synchronous Transfer Mode business is not made Asynchronous Transfer Mode ATM in described Asynchronous Transfer Mode cell adaptation layer, directly the Asynchronous Transfer Mode ATM cell of Synchronous Transfer Mode STM service signal and Asynchronous Transfer Mode ATM business is mapped in the broadband passive optical network PON frame together and assemble the TC sublayer in described transmission; Wherein said broadband passive optical network PON frame is made up of Synchronous Transfer Mode STM time slot and Asynchronous Transfer Mode ATM cell and physical layer overhead; The frame length of described broadband passive optical network PON frame is n a times of 125 μ s, and n is a positive integer; The clock of described broadband passive optical network PON and the business network interface SNI clock synchronization that Synchronous Transfer Mode STM service signal is provided.
Upper-layer protocol towards the circuit-mode business becomes PON frame at the PON Transmission Convergence Sub-layer with the ATM business through the processing of circuit-mode CM layer, and multiplexing function is mainly carried out in the processing of CM layer, business is dredged and the cross connect function that disposes etc.
During transmission, the STM signal is cached in STM first-in first-out fifo queue, and the ATM service signal is cached in ATM first-in first-out fifo queue, the output of these two formations regularly is read into the transmit queue of broadband P ON so that form broadband P ON frame under the control that transmits control signal that produces according to broadband P ON frame structure, finish the comprehensive of ATM signal and STM signal, its output further processing through fail safe and physical medium sublayer transfers to receiving terminal; After the processing of physical medium sublayer and fail safe, obtain ATM and STM integrated signal at receiving terminal, by the reception control signal control that produces according to broadband P ON frame structure the STM signal is read into STM and receive fifo queue, ATM cell reads into ATM and receives fifo queue, finishes separating of STM and ATM signal.The transmission of circuit-mode business is that the time slot with a length n byte is a unit, is called the STM time slot, and n is a positive integer; At the PON system clock of OLT generation with the clock synchronization of the SNI that the circuit-mode business is provided, ONU extracts clock from the signal flow that OLT transmits.STM timeslot number in each PON frame and position thereof are by the system management assignment, and total how many STM time slots of each ONU and position thereof are also by the system management assignment.
What Fig. 2 a and Fig. 2 b described is to realize electric theory diagram of the present invention.When system initialization, processor 4 is responsible for and the communicating by letter and Message Processing of system network management, requires configurating downlink sending controling circuit 5, descending reception control circuit 28, up medium access control MAC (MediumAccess Control) control circuit 67 and up reception MAC control circuit 44 according to system network management.Shown in Fig. 2 a, the signal that descending transtation mission circuit 11 of OLT and the descending receiving circuit 29 of ONU and ODN12 finish down direction transmits, and promptly the signal of OLT to ONU direction transmits.In the descending transtation mission circuit 11 of OLT, the STM signal that the STM signal bus comes is input to descending STM and sends FIFO1; Send FIFO2 and be input to descending ATM from the ATM cell that the ATM cell bus is come; Configuration and system frame structure according to system network management regularly is sent to descending transmission FIFO7 with PLOAM cell, STM signal and the ATM cell that down physical layer Operation Administration and Maintenance PLOAM (Physical Layer Operation Administration Maintenance) cell generation circuit 3 is produced then, and wherein said PLOAM cell is used for frame synchronization, physical layer is safeguarded, moved and management; The output of described descending transmission FIFO7 is carried out parallel/serial conversion in parallel/serial change-over circuit 8, in scrambler circuit 9, carry out scrambler, and in electricity/light change-over circuit 10, carry out electricity/light conversion, deliver to optical distribution network 12 at last, so that be transferred to the descending receiving circuit 29 of ONU.In the descending receiving circuit 29 of ONU, the light signal that receives at first carries out light/electricity conversion in light/power conversion circuit 21, utilize timing extraction circuit 23 to extract bit clock, in scrambling code decoding circuit 22, carry out descrambling code, utilize then and realize downlink frame synchronous and string and conversion in the synchronous and serial/parallel change-over circuit 24 of downlink frame; Deliver to descending STM at following STM signal of descending reception control circuit 28 controls and receive FIFO25, and ATM cell is delivered to descending ATM receive FIFO26, STM signal bus and ATM cell bus are delivered in their output respectively, thereby finish comprehensive on the TC layer of STM signal and ATM cell on the down direction.In addition, descending PLOAM is imported into descending PLOAM receiving circuit under descending reception control circuit 28 controls, and its output is delivered to processor 4 so that carry out the function of physical layer Operation, Administration and Maintenance aspect.
Shown in Fig. 2 b, the signal that up transtation mission circuit 68 of ONU and the up receiving circuit 47 of OLT and ODN12 finish up direction transmits, and promptly the signal of ONU to OLT direction transmits.In the up transtation mission circuit 68 of ONU, the STM signal that the STM signal bus comes is input to up STM and sends FIFO64, is input to up ATM from the ATM cell of ATM cell bus and sends FIFO65; Respectively up STM being sent the STM signal of FIFO64 output, up ATM under the control of up MAC control circuit 67 sends the ATM signal of FIFO65 output and up PLOAM cell and mini-slot and produces up PLOAM cell that circuit 66 produced and be used to report the mini-slot of ONU bandwidth request to be sent to up transmission FIFO63; Expense (the OVERHEAD that is used for the time division multiple access tdma communication is inserted in the output of described up transmission FIFO63 in the insertion of TDMA expense, scrambler and parallel/serial change-over circuit 62, write a Chinese character in simplified form into OH), and under the clock effect that comprises bit clock, byte clock and frame pulse that utilizes downstream signal to extract, carry out scrambler, and carry out parallel/serial conversion; In burst mode electricity/light modular converter 61, carry out the electric light conversion.Light signal after the conversion is delivered to optical distribution network 12, and transfers to the up receiving circuit 47 of OLT.The light signal that the up receiving circuit 47 of OLT receives carries out opto-electronic conversion in burst mode light/electric modular converter 46, the output of described burst mode light/electric modular converter 46 is transferred to burst synchronization and descrambling circuit 45; In burst synchronization and descrambling circuit 45, utilize the clock comprise bit clock, byte clock and frame pulse to carry out synchronously and the parallel signal is synchronously carried out descrambling code; Data behind the descrambling are delivered to up STM respectively and are received FIFO41, up ATM reception FIFO42 and up PLOAM and mini-slot reception FIFO43 under the control of up reception MAC control circuit 44; The output that up STM receives FIFO41 transfers to subsequent process circuit through the output that STM signal bus and up ATM receive FIFO42 through the ATM signal bus, thereby finishes comprehensive on the TC sublayer of ACTC_PON of up direction STM signal and ATM cell.
The ACTC_PON system frame structure specifically is such: the up-downgoing frame length is the positive integer times (positive integer preferably gets 1,2,3 and 4) of 125 μ s here; First and the middle several slots unit of downlink frame is to be used for downlink frame synchronously and physical layer is moved, the PLOAM cell of maintenance and management OAM, and all the other are configured to by system network management is ATM cell or STM time slot (length is granularity with the byte); Uplink frame is added to be used for the expense composition that the TDMA mode is communicated by letter by ATM cell or STM time slot or PLOAM cell or mini-slot (length is granularity with the byte).The position of ATM cell, STM time slot, PLOAM cell and mini-slot and quantity are determined by system network management and MAC agreement.
The clock of whole ACTC_PON system and the clock synchronization that the SNI of circuit-mode business is provided.Specifically: the clock generation circuit at the OLT place produces and 2.048MHz, the 8KHz of the SNI strict synchronism that the circuit-mode business is provided and the clock of 155.52MHz.2.048MHz and the 8KHz clock is used for the STM signal processing; 155.52MHz clock is the systematic bits clock.From the code stream that OLT transmits, extract clock and the frame frequency clock of 155.52MHz at the ONU place, be used for the STM signal processing by the 2.048MHz clock that the frame signal frequency multiplication produces and OLT is synchronous and use.The clock recovery problem of the complexity when not having circuit simulation like this.
Shown in Figure 3 is the frame structure of first embodiment of the invention.In this embodiment, the transmission rate of up-downgoing is 155.52Mb/s, and the up-downgoing frame length is 125 μ s.Descending PLOAM is used for the expense of physical layer operation maintenance and management; comprise mandate to each ONU utilized bandwidth, frame synchronous byte, OAM message, dynamically byte is adjusted in range finding, control byte, official traffic expense etc. are switched in protection; descending PLOAM cell is 49 bytes; ATM cell and STM time slot are 53 byte longs; totally 44, its quantity is specified by system network management respectively.Uplink frame contains 43 the up PLOAM cell, ATM cell, the STM time slots that add 3 byte TDMA expenses (OH) altogether, cuts apart time slot and up public affair speech channel and spare bytes.Wherein cutting apart time slot is 53 byte longs, is made up of n mini-slot, and n is a positive integer.Cutting apart the position of time slot and quantity and mini-slot counts n and is determined by system network management.Up PLOAM, ATM cell and 53 byte longs of STM time slot, their quantity is determined by system network management.Up PLOAM is used for the expense of physical layer operation maintenance and management, comprises OAM message, protects and switch control byte, official traffic signaling consumption etc.; Cut apart the MAC agreement that time slot is used for system.Shown in Figure 4 is the frame structure of second embodiment of the invention.In this embodiment, the transmission rate of up-downgoing is 155.52Mb/s, and the up-downgoing frame length is 250 μ s.Descending PLOAM cell is 49 byte longs, have 4, the expense that is used for physical layer operation maintenance and management comprises that byte is adjusted in mandate, frame synchronous byte, OAM message, the dynamic range finding to each ONU utilized bandwidth, control byte, official traffic expense etc. are switched in protection; ATM cell and STM time slot are 53 byte longs, and both have 88, and they divide other quantity to be specified by system network management.Uplink frame contains 86 altogether and adds up PLOAM cell, ATM cell, the STM time slot of 3 byte TDMA expenses and cut apart time slot, and their quantity is determined by system network management; The up public affair speech channel and the spare bytes that also have 2 22 bytes in addition.Up PLOAM, ATM cell and STM time slot and cut apart equal 53 byte longs of time slot.Up PLOAM is used for the expense of physical layer operation maintenance and management, comprises OAM message, protects and switch control byte, official traffic signaling consumption etc.; Cut apart the MAC agreement that time slot is used for system.
Claims (15)
1. be used on the broadband passive optical network transmission convergence sublayer a kind of method of comprehensive Asynchronous Transfer Mode and Synchronous Transfer Mode business, wherein the broadband passive optical network hierarchy is such: top is the upper-layer protocol of service-oriented application; Be the circuit-mode layer below the upper-layer protocol of Synchronous Transfer Mode business, this circuit-mode layer is responsible for finishing multiplexing, cross connect function; Group mode circuit-mode business professional and/or that make circuit simulation is referred to as the Asynchronous Transfer Mode business, be Asynchronous Transfer Mode cell adaptation layer below the upper-layer protocol of Asynchronous Transfer Mode business, finish that high layer information is adapted to the Asynchronous Transfer Mode cell and the Asynchronous Transfer Mode cell reassembles into the high-level protocol information form; Below the described Asynchronous Transfer Mode cell adaptation layer is the Asynchronous Transfer Mode layer, be responsible for to carry out multiplexed, the interconnection of Asynchronous Transfer Mode cell, generation and the extraction and the general flow control function of letter head; Described Asynchronous Transfer Mode layer and described circuit-mode layer are downwards the Transmission Convergence Sub-layer towards the broadband passive optical network physical layer side by side, finish bit, byte, frame synchronization and burst synchronization, range finding, allocated bandwidth and completeness security function; Be the physical medium sublayer below the described Transmission Convergence Sub-layer, carry out light/electric conversion, wavelength multiplexing, optical fiber linkage function;
It is characterized in that, it is adaptive that the Synchronous Transfer Mode business is not made Asynchronous Transfer Mode in described Asynchronous Transfer Mode cell adaptation layer, and directly the Asynchronous Transfer Mode cell of Synchronous Transfer Mode service signal and Asynchronous Transfer Mode business is mapped in the broadband passive optical network frame together at described Transmission Convergence Sub-layer; Wherein said broadband passive optical network frame is made up of Synchronous Transfer Mode time slot and Asynchronous Transfer Mode cell and physical layer overhead; The frame length of described broadband passive optical network frame is n a times of 125 μ s, and n is a positive integer; The clock of described broadband passive optical network with provide the business network interface clock of Synchronous Transfer Mode service signal synchronous;
Wherein when sending, the Synchronous Transfer Mode signal is cached in the Synchronous Transfer Mode First Input First Output, and the Asynchronous Transfer Mode service signal is cached in the Asynchronous Transfer Mode First Input First Output, the output of these two formations regularly is read into the transmit queue of broadband passive optical network under the control that transmits control signal that produces according to the broadband passive optical network frame structure, so that form the broadband passive optical network frame, thereby obtain the integrated signal of Asynchronous Transfer Mode signal and Synchronous Transfer Mode signal.
2. according to the method for claim 1, wherein said integrated signal further transfers to receiving terminal after the processing of fail safe and physical medium sublayer, by the reception control signal control that produces according to described broadband passive optical network frame structure the Synchronous Transfer Mode signal is read into Synchronous Transfer Mode and receive First Input First Output, the Asynchronous Transfer Mode cell reads into Asynchronous Transfer Mode and receives First Input First Output, finishes separating of Synchronous Transfer Mode and Asynchronous Transfer Mode signal.
3. according to the process of claim 1 wherein that the transmission of Synchronous Transfer Mode business is that Synchronous Transfer Mode time slot with a length n byte is a unit, n is a positive integer.
4. produce and the synchronous passive optical network clock of business network interface clock that the Synchronous Transfer Mode business is provided at optical line terminal according to the process of claim 1 wherein, optical network unit extracts clock from the signal flow that the optical line terminal transmission comes.
5. according to the process of claim 1 wherein, also by the Synchronous Transfer Mode timeslot number and the position thereof of each optical network unit of system management assignment by Synchronous Transfer Mode timeslot number and position thereof in each EPON frame of system management assignment.
6. be used to realize a kind of equipment of method according to claim 1 comprehensive Asynchronous Transfer Mode and Synchronous Transfer Mode business on the broadband passive optical network transmission convergence sublayer, wherein the broadband passive optical network hierarchy is such: top is the upper-layer protocol of service-oriented application; Be the circuit-mode layer below the upper-layer protocol of Synchronous Transfer Mode business, this circuit-mode layer is responsible for finishing multiplexing, cross connect function; Group mode circuit-mode business professional and/or that make circuit simulation is referred to as the Asynchronous Transfer Mode business, be Asynchronous Transfer Mode cell adaptation layer below the upper-layer protocol of Asynchronous Transfer Mode business, finish that high layer information is adapted to the Asynchronous Transfer Mode cell and the Asynchronous Transfer Mode cell reassembles into the high-level protocol information form; Below the described Asynchronous Transfer Mode cell adaptation layer is the Asynchronous Transfer Mode layer, be responsible for to carry out multiplexed, the interconnection of Asynchronous Transfer Mode cell, generation and the extraction and the general flow control function of letter head; Described Asynchronous Transfer Mode layer and described circuit-mode layer are downwards the Transmission Convergence Sub-layer towards the broadband passive optical network physical layer side by side, finish bit, byte, frame synchronization and burst synchronization, range finding, allocated bandwidth and completeness security function; Be the physical medium sublayer below the described Transmission Convergence Sub-layer, carry out light/electric conversion, wavelength multiplexing, optical fiber linkage function;
It is characterized in that, it is adaptive that the Synchronous Transfer Mode business is not made Asynchronous Transfer Mode in described Asynchronous Transfer Mode cell adaptation layer, and directly the Asynchronous Transfer Mode cell of Synchronous Transfer Mode service signal and Asynchronous Transfer Mode business is mapped in the broadband passive optical network frame together at described Transmission Convergence Sub-layer; Wherein said broadband passive optical network frame is made up of Synchronous Transfer Mode time slot and Asynchronous Transfer Mode cell and physical layer overhead; The frame length of described broadband passive optical network frame is n a times of 125 μ s, and n is a positive integer; The clock of described broadband passive optical network with provide the business network interface clock of Synchronous Transfer Mode service signal synchronous;
Wherein, described equipment is made up of optical line terminal and optical network unit and tree-like optical distribution network (12), wherein said optical line terminal is made up of descending transtation mission circuit of optical line terminal (11) and the up receiving circuit of optical line terminal (47), and described optical network unit is made up of up transtation mission circuit of optical network unit (68) and the descending receiving circuit of optical network unit (29); Wherein when sending, the Synchronous Transfer Mode signal is cached in Synchronous Transfer Mode and sends pushup storage (1,64) in, and the Asynchronous Transfer Mode service signal is cached in Asynchronous Transfer Mode transmission pushup storage (2,65) in, its output is at sending controling circuit (5,67) control that transmits control signal that produces according to the broadband passive optical network frame structure regularly is read into the transmission pushup storage (7 of broadband passive optical network down, 63), so that form the broadband passive optical network frame, thereby obtain the integrated signal of Asynchronous Transfer Mode signal and Synchronous Transfer Mode signal.
7. according to the equipment of claim 6, the signal that descending transtation mission circuit of wherein said optical line terminal (11) and the descending receiving circuit of optical network unit (29) and optical distribution network (12) are finished down direction transmits, and promptly optical line terminal to the signal of optical network unit direction transmits.
8. according to the equipment of claim 7, wherein in the descending transtation mission circuit of described optical line terminal (11), the Synchronous Transfer Mode signal that the Synchronous Transfer Mode signal bus comes is input to the down-going synchronous transfer mode and sends pushup storage (1); Send pushup storage (2) and be input to descending Asynchronous Transfer Mode from the Asynchronous Transfer Mode cell that the Asynchronous Transfer Mode cell bus comes; Configuration and system frame structure according to system network management regularly is sent to descending transmission pushup storage (7) with Physical Layer OAM cell, Synchronous Transfer Mode signal and the Asynchronous Transfer Mode cell that down physical layer Operation Administration and Maintenance cell generation circuit (3) is produced then, and wherein said Physical Layer OAM cell is used for frame synchronization, physical layer is safeguarded, moved and management; The output of described descending transmission pushup storage (7) is carried out parallel/serial conversion in parallel/serial change-over circuit (8), in scrambler circuit (9), carry out scrambler, and in electricity/light change-over circuit (10), carry out electricity/light conversion, deliver to optical distribution network (12) at last so that be transferred to the descending receiving circuit of optical network unit (29).
9. according to the equipment of claim 7, wherein in the descending receiving circuit of described optical network unit (29), the light signal that receives at first carries out light/electricity conversion in light/power conversion circuit (21), utilize timing extraction circuit (23) to extract bit clock, in scrambling code decoding circuit (22), carry out descrambling code, utilize then and realize downlink frame synchronous and string and conversion in the synchronous and serial/parallel change-over circuit of downlink frame (24); Deliver to the down-going synchronous transfer mode at following Synchronous Transfer Mode signal of descending reception control circuit (28) control and receive pushup storage (25), and the Asynchronous Transfer Mode cell is delivered to descending Asynchronous Transfer Mode receive pushup storage (26), Synchronous Transfer Mode signal bus and Asynchronous Transfer Mode cell bus are delivered in their output respectively.
10. according to the equipment of claim 6, the signal that up transtation mission circuit of wherein said optical network unit (68) and the up receiving circuit of optical line terminal (47) and described optical distribution network (12) are finished up direction transmits, and promptly optical network unit to the signal of optical line terminal direction transmits.
11. equipment according to claim 10, wherein in the up transtation mission circuit of described optical network unit (68), the Synchronous Transfer Mode signal that the Synchronous Transfer Mode signal bus comes is input to the uplink synchronous transfer mode and sends pushup storage (64), is input to up Asynchronous Transfer Mode from the Asynchronous Transfer Mode cell of Asynchronous Transfer Mode cell bus and sends pushup storage (65); Under the control of up medium access control circuit (67), respectively the uplink synchronous transfer mode is sent the output Synchronous Transfer Mode signal of pushup storage (64), up Asynchronous Transfer Mode sends the Asynchronous Transfer Mode signal of pushup storage (65) output and upstream physical layer Operation Administration and Maintenance cell and mini-slot and produces upstream physical layer Operation Administration and Maintenance cell that circuit (66) produces and be used for reporting the mini-slot of optical network unit bandwidth request to be sent to up transmission pushup storage (63); The expense that is used for the time division multiple access time division multiple access communication is inserted in the output of described up transmission pushup storage (63) in the insertion of time division multiple access expense, scrambler and parallel/serial change-over circuit (62), and under the clock effect that comprises bit clock, byte clock and frame pulse that utilizes downstream signal to extract, carry out scrambler, and carry out parallel/serial conversion; Carry out the electric light conversion in burst mode electricity/light modular converter (61), the light signal after the conversion is delivered to optical distribution network (12), and transfers to the up receiving circuit of optical line terminal (47).
12. equipment according to claim 10, the light signal that the up receiving circuit of wherein said optical line terminal (47) receives carries out opto-electronic conversion at burst mode light/electric modular converter in (46), and the output of described burst mode light/electric modular converter (46) is transferred to burst synchronization and descrambling circuit (45); Utilization comprises the clock synchronization of bit clock, byte clock and frame pulse and the parallel signal is synchronously carried out descrambling code in burst synchronization and descrambling circuit (45); Data behind the descrambling are delivered to the uplink synchronous transfer mode respectively and are received pushup storage (41), up Asynchronous Transfer Mode reception pushup storage (42) and upstream physical layer Operation Administration and Maintenance and mini-slot reception pushup storage (43) under the control of up reception medium access control circuit (44); The output that the uplink synchronous transfer mode receives pushup storage (41) transfers to subsequent process circuit through the output of Synchronous Transfer Mode signal bus and up Asynchronous Transfer Mode reception pushup storage (42) through the Asynchronous Transfer Mode signal bus, and upstream physical layer Operation Administration and Maintenance cell and mini-slot are input to described upstream physical layer Operation Administration and Maintenance and mini-slot reception pushup storage (43).
13. according to the equipment of claim 6, wherein the transmission of Synchronous Transfer Mode business is that the Synchronous Transfer Mode time slot with a length n byte is a unit, n is a positive integer.
14. according to the equipment of claim 6, wherein produce and the synchronous passive optical network clock of business network interface clock that the Synchronous Transfer Mode business is provided at optical line terminal, optical network unit extracts clock from the signal flow that the optical line terminal transmission comes.
15. according to the equipment of claim 6, wherein by Synchronous Transfer Mode timeslot number and position thereof in each EPON frame of system management assignment, also by the Synchronous Transfer Mode timeslot number and the position thereof of each optical network unit of system management assignment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99121940A CN1104789C (en) | 1999-10-18 | 1999-10-18 | Method and device for integrating ATM services with STM services |
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| Application Number | Priority Date | Filing Date | Title |
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| CN99121940A CN1104789C (en) | 1999-10-18 | 1999-10-18 | Method and device for integrating ATM services with STM services |
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| CN1250989A CN1250989A (en) | 2000-04-19 |
| CN1104789C true CN1104789C (en) | 2003-04-02 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100379270C (en) * | 2003-05-20 | 2008-04-02 | 三星电子株式会社 | Scramble release device for scrambled digital broadcasting streams in broadcasting communication convergence system |
| WO2008046280A1 (en) * | 2006-10-18 | 2008-04-24 | Huawei Technologies Co., Ltd. | Method, system and apparatus for sdh fram transmission over optical networks |
| CN100413255C (en) * | 2005-12-01 | 2008-08-20 | 中讯邮电咨询设计院 | Network layered model and interlaminar mapping method for optical transmission communication network |
| WO2010048837A1 (en) * | 2008-10-31 | 2010-05-06 | 华为技术有限公司 | Service transmission method and device used for service transmission |
| US7848653B2 (en) | 2004-12-14 | 2010-12-07 | Huawei Technologies Co., Ltd. | Method and device for transmitting low rate signals over an optical transport network |
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| CN100433672C (en) * | 2002-11-11 | 2008-11-12 | 华为技术有限公司 | Method of flow-concourse and flow-distribution in multi speed rates synchronous digital network and device |
| CN100596043C (en) * | 2004-08-26 | 2010-03-24 | 华为技术有限公司 | Method and apparatus for realizing low-speed signal transparent transmission in optical transmission network |
| CN101378388B (en) * | 2007-08-28 | 2012-10-03 | 华为技术有限公司 | Method, system and equipment for transmitting passive optical network data |
| CN104009801B (en) * | 2013-02-27 | 2016-09-07 | 中兴通讯股份有限公司 | The optical signal processing method of a kind of optical-fiber network and device |
| CN107306165B (en) * | 2016-04-21 | 2019-09-13 | 深圳市中兴微电子技术有限公司 | A kind of method for transmitting signals and device |
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1999
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100379270C (en) * | 2003-05-20 | 2008-04-02 | 三星电子株式会社 | Scramble release device for scrambled digital broadcasting streams in broadcasting communication convergence system |
| US7848653B2 (en) | 2004-12-14 | 2010-12-07 | Huawei Technologies Co., Ltd. | Method and device for transmitting low rate signals over an optical transport network |
| CN100413255C (en) * | 2005-12-01 | 2008-08-20 | 中讯邮电咨询设计院 | Network layered model and interlaminar mapping method for optical transmission communication network |
| WO2008046280A1 (en) * | 2006-10-18 | 2008-04-24 | Huawei Technologies Co., Ltd. | Method, system and apparatus for sdh fram transmission over optical networks |
| WO2010048837A1 (en) * | 2008-10-31 | 2010-05-06 | 华为技术有限公司 | Service transmission method and device used for service transmission |
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| Publication number | Publication date |
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| CN1250989A (en) | 2000-04-19 |
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