CN107181989A - Passive optical network system - Google Patents

Passive optical network system Download PDF

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Publication number
CN107181989A
CN107181989A CN201710597689.4A CN201710597689A CN107181989A CN 107181989 A CN107181989 A CN 107181989A CN 201710597689 A CN201710597689 A CN 201710597689A CN 107181989 A CN107181989 A CN 107181989A
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China
Prior art keywords
passive optical
plurality
onu
optical network
network system
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CN201710597689.4A
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Chinese (zh)
Inventor
何松生
王于波
刘晓露
胡力佳
刘然
叶高翔
姚庆党
林方银
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北京智芯微电子科技有限公司
国网信息通信产业集团有限公司
国家电网公司
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Priority to CN201710597689.4A priority Critical patent/CN107181989A/en
Publication of CN107181989A publication Critical patent/CN107181989A/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062Network aspects
    • H04Q11/0067Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062Network aspects
    • H04Q2011/0079Operation or maintenance aspects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062Network aspects
    • H04Q2011/0079Operation or maintenance aspects
    • H04Q2011/0081Fault tolerance; Redundancy; Recovery; Reconfigurability
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062Network aspects
    • H04Q2011/0086Network resource allocation, dimensioning or optimisation

Abstract

The present invention discloses a passive optical network system. Based on a serial communication protocol and a system transparent transmission serial port protocol, the passive optical network system comprises a passive optical network (ODN), a plurality of terminal devices (ONU) and an optical line terminal (OLT). The passive optical network (ODN) comprises optical fibers and a passive optical splitter. The user-side communication interfaces of the plurality of terminal devices (ONU) are serial ports and enable the UART data transparent transmission. The plurality of terminal devices (ONU) are low-speed optical modules. The optical line terminal (OLT) is a low-speed optical module and the network-side interface of the optical line terminal (OLT) enables the UART data transparent transmission. The optical line terminal (OLT) sends downlink data to the passive optical network (ODN) through optical fibers or receives uplink data from the plurality of terminal devices (ONU) on a user side. The input port of the passive optical splitter is connected with the optical line terminal (OLT) through optical fibers. The plurality of output ports of the passive optical splitter are respectively connected to the plurality of terminal devices (ONU) through optical fibers. Therefore, the passive optical network system saves the cost and reduces the power consumption. Meanwhile, the system is flexible in networking mode.

Description

无源光网络系统 Passive optical network system

技术领域 FIELD

[0001 ]本发明涉及光纤通信技术领域,特别涉及一种无源光网络系统。 [0001] The present invention relates to the field of optical communication technology, particularly to a passive optical network system.

背景技术 Background technique

[0002] RS232/422/485总线具有结构简单、通信速率高、组网方便等优点,是工业现场总线一种重要的通信方式。 [0002] RS232 / 422/485 bus has a simple structure, high communication speed, network convenience, etc., is an important industrial fieldbus communication. 由于自动化设备大多数工作环境恶劣,容易受到各种电磁干扰的影响,电缆作为传输介质,通信可靠性不高;同时电缆传输距离有限,无法实现几十公里的长距离传输。 Because most automation equipment working in harsh environments, vulnerable to a variety of electromagnetic interference, the cable as a transmission medium, communication reliability is not high; at the same time cable transmission distance is limited, can not achieve long-distance transmission of tens of kilometers. 使用光纤作为传输介质,解决了串口数据的电磁干扰和长距离传输等问题。 Using an optical fiber as a transmission medium, electromagnetic interference and solve the long-distance transmission of serial data and so on. 串口光纤组网方式有串口光猫、工业以太网和EP0N无源光网络三种方式。 Serial optical networking with a serial port light cat, Industrial Ethernet and passive optical network EP0N three ways.

[0003] (1)串口光猫完成串口到光纤的转换,实现RS232/422/485串行数据通过光纤的远距离透明传输。 [0003] (1) Serial complete cat-serial conversion of the optical fiber, to achieve RS232 / 422/485 serial data by long-distance transmission fiber transparent. 串口光猫一般是“点对点”的组网方式,或多个串口光猫合成一个设备支持“星型”组网方式,对于较为复杂的网络,采用“串联”组网方式。 Serial light cat is "point" networking, or a plurality of serial optical device supports the cat, "star" networking, for more complex networks, a "series" networking. 三种方式共同点是每根光纤都需要一对串口光猫。 Three ways in common is that each fiber needs a serial port light cat.

[0004] (2)工业以太网和串口光猫方案组网方式完全一样,也是“点对点,,、“星型,,或“串联”等组网方式;与串口光猫透传串口数据不同,工业以太网对串口数据进行以太网帧的封装,以TCP/IP协议传输。 [0004] (2) Industrial Ethernet, and serial optical networking programs exactly the same cat, but also "point ,,," star,, or "tandem" other networking; cat-passthrough with different serial serial data, industrial Ethernet serial data to be encapsulated Ethernet frames to TCP / IP protocol. 这样做的优势是网络传输的不仅仅是串口数据,也可以传输其它高带宽的以太网数据。 The advantage is not only serial data transmission network, it can also be transferred to other high-bandwidth Ethernet data.

[0005]⑶一个典型的EPON (Ethernet Passive Optical Network)系统由0LT、0NU、0DN 组成。 [0005] ⑶ a typical EPON (Ethernet Passive Optical Network) system consists 0LT, 0NU, 0DN composition. 局端设备OLT放在中心机房;终端设备〇NU放在用户设备端附近;〇DN是光配线网,包括无源$光器和光纤,连接0LT和0NU设备,实现一点对多点的网络传输。 The central office apparatus OLT in the central office; 〇NU terminal device placed near the user terminal equipment; 〇DN Optical Distribution Network is comprising a passive optical $ and fiber connected 0LT 0NU and equipment to achieve a multipoint network transmission. EP0N技术按照电信运营商高带宽要求设计,并在FTTC/FTTB/FTTH领域成功大规模商用,这几年在电力自动化领域应用也越来越广泛,0NU设备通过RS485接口连接电力设备,把串口数据封装成以太网帧传输到0LT设备。 EP0N technology telecom operators according to the high bandwidth requirements of the design, and large-scale commercial success in FTTC / FTTB / FTTH field, in recent years in the power automation applications are increasingly being used, 0NU device via RS485 interface to connect electrical equipment, the serial data encapsulated into an Ethernet frame to the 0LT device. 与电信运营商高带宽需求不同的是,电力应用对EP0N技术的成本和功耗要求极高。 And telecom operators demand for high bandwidth difference is that the power of technology applications EP0N high cost and power requirements.

[0006]通过对现有技术方案研宄,很容易总结出现有方案存在以下缺点:(1)对于串口光猫和工业以太网方案,每根光纤都需要一对光模块,成本和功耗较高,不适合“树型”等复杂的组网方式,“串联”组网方式增加了系统的故障点和维护成本,工业环境取电也是难题。 [0006] Through the study based on the prior art solutions, it is easy to have the following disadvantages occur summarized scheme: (1) for industrial Ethernet port and light cat embodiment, each optical fiber requires a module, cost and power consumption than high, is not suitable for complicated network "tree" and "series" networking increases the failure point of the system and maintenance costs, the industrial environment is to take power problem. ⑵对于EP0N在电力应用方案,由于EP0N技术为高带宽业务需求定制的,在电力系统的应用带宽利用率极低,追求高带宽带来了成本和功耗的增加,不符合电力的业务需求。 ⑵ For EP0N applications in power since EP0N technology for high-bandwidth services tailored to the needs, the needs of the power system in the application bandwidth utilization is very low, the pursuit of high-bandwidth brought about an increase in cost and power consumption, does not meet the electricity business. (3) EP0N 系统在接入Uart接口时,把Uart数据封装成以太网数据帧,对于业务数据量非常小的RS232/422/485业务,封装为以太网帧需要增加大量“帧头”、“帧尾”、“填充,,等字节,网络传输效率非常低 (3) EP0N Uart system when accessing the interface, the data is encapsulated into Ethernet Uart data frame, for a very small amount of data traffic RS232 / 422/485 service, encapsulated Ethernet frames to increase the number of "header", " frame end "," ,, other filled bytes, the network transmission efficiency is very low

[0007]公开于该背景技术部分的信息仅仅旨在增加对本发明的总体背景的理解,而不应当被视为承认或以任何形式暗示该信息构成已为本领域一般技术人员所公知的现有技术。 [0007] disclosed in this Background section is only for enhancement of understanding of the information of the general background of the invention and should not be taken as an acknowledgment or any form of suggestion that this information forms known to those of ordinary skill in the known prior technology.

发明内容 SUMMARY

[0008] 本发明的目的在于提供一种无源光网络系统,既可以实现串口数据通过无源光网络进行点对多点的传输,也可以满足低成本和低功耗的业务需求。 [0008] The object of the present invention is to provide a passive optical network system, may be realized multipoint serial data transmission via a passive optical network, also meet the low cost and low power requirements of the business.

[0009] 为实现上述目的,本发明提供了一种无源光网络系统,其基于串口通信协议及系统透传串口协议,无源光网络系统包含:无源光网络0DN、多个终端设备0NU以及局端设备OLT。 [0009] To achieve the above object, the present invention provides a passive optical network system based on a serial communication protocol and a serial protocol transparent transmission system, passive optical network system comprising: a passive optical network 0DN, a plurality of terminal devices 0NU and a central office apparatus OLT. 无源光网络ODN包含光纤和无源分光器;多个终端设备0NU用户侧通信接口为串口,支持Uart数据透传,且多个终端设备〇NU采用低速光模块;以及局端设备0LT采用低速光模块, 且局端设备0LT的网络侧接口支持Uart数据透传,局端设备0LT通过光纤向无源光网络0DN 发送下行数据或接受来自用户侧多个终端设备〇NU的上行数据。 ODN passive optical network comprises optical fibers and a passive optical splitter; a plurality of user-side communication terminal apparatus 0NU serial interface, Uart support transparent transmission of data, and a plurality of terminal devices 〇NU a low-speed optical module; low-speed, and the OLT 0LT optical module and the central office equipment to support network-side interface 0LT Uart transparent data transmission, the central office device 0LT transmits downlink data to the passive optical network via fiber optic or 0DN receiving uplink data from the user side of the plurality of terminal devices 〇NU. 其中,无源分光器的输入端口通过光纤与局端设备OLT连接,且无源分光器的多个输出端口分别通过光纤与多个终端设备0NU连接,并且其中无源光网络系统中的数据以原始的帧格式进行传输而不进行封装。 Wherein, the passive optical splitter connected to the input port of the OLT via optical fiber to the central office equipment, and a plurality of passive optical splitter output ports are connected through an optical fiber 0NU plurality of terminal devices, and wherein the data in the passive optical network system to the original frame format for transmission without encapsulation.

[0010] 优选地,上述技术方案中,多个终端设备0NU的低速光模块及局端设备0LT的低速光模块均为2M低速光模块。 [0010] Preferably, the above-described aspect, the plurality of terminal devices 0NU low-speed optical module and the central office equipment 0LT 2M low-rate optical module is a low-speed optical module.

[0011] 优选地,上述技术方案中,发送下行数据是采用广播模式,接收上行数据是采用时分多址模式。 [0011] Preferably, the above technical scheme, the downlink data is transmitted in the broadcast mode, the uplink data is received using the time division multiple access mode.

[0012] 优选地,上述技术方案中,无源分光器最大支持1:512分光比。 [0012] Preferably, the above technical solution, the passive optical splitter maximum support 1: 512 splitting ratio.

[0013]优选地,上述技术方案中,发送下行数据的工作流程包含:在下行数据的工作时间窗口内,局端设备OLT利用无源分光器将下行数据推送到多个终端设备〇NU,多个终端设备0NU都打开接收电路,接收下行数据并从串口转发出去;在下行数据的休眠时间窗口内,局端设备OLT不进行转发下行数据,且多个终端设备ONU都关闭接收电路。 [0013] Preferably, the above technical solution, the transmission of the downlink data workflow comprises: a time window in the working downlink data, the central office apparatus OLT using a passive optical splitter downlink data pushed to a plurality of terminal devices 〇NU, multiple terminal devices are turned 0NU receiving circuit, and receives the downlink data forwarded from the serial port; sleep time window in the downlink data, the central office apparatus OLT does not forward the downlink data, and a plurality of terminal devices are closed ONU receiving circuit.

[00M]优选地,上述技术方案中,发送所述上行数据的工作流程包含:把上行数据的上行时间分成多个时间片,每个终端设备0NU获取相等长度的时间片;每个终端设备ONU只能在属于自己的时间片内向局端设备0LT发送上行数据,且在每个时间片上通过光纤只传送一个上行数据至局端设备0LT;每个终端设备0NU在自己的时间片外,终端设备〇NU关闭发送电路。 [00M] Preferably, the above technical solution, the transmission of the uplink data workflow comprises: an uplink time the uplink data into a plurality of time slices, each terminal device 0NU sheet acquisition time of equal length; each terminal apparatus ONU 0LT uplink transmission only within a time slice data of their own central office device, and transmits uplink data to a central office device by an optical fiber 0LT only in each time slice; 0NU each terminal device outside their time slices, the terminal device 〇NU closed transmission circuit.

[0015]与现有技术相比,本发明具有如下有益效果:本发明的无源光网络系统,与串口光猫和工业以太网方案相比,具有如下有益效果:(1)无源光网络模式,节省了主干光纤资源和光模块的数量,降低了成本和功耗•,⑵组网方式灵活,更适合工业总线复杂的网络环境; (3)减少了系统故障点,增加了可靠性,降低了维护成本。 [0015] Compared with the prior art, the present invention has the following advantages: a passive optical network system according to the present invention, as compared with cats and light industrial Ethernet serial programs, has the following advantages: (1) Passive Optical Network mode, saving resources and the number of trunk fiber optical module, reducing cost and power consumption •, ⑵ flexible networking, and more suitable for industrial complex network bus; (3) reduce the number of failure points, increased reliability, reduced maintenance costs. 本发明的无源光网络系统,与EP0N 方案相比,具有如下有益效果:(1)无源光网络系统采用2M低速光模块,节省了成本,降低了功耗。 Passive optical network system according to the present invention, compared with EP0N embodiment, has the following advantages: (1) passive optical network system using 2M low-rate optical module, cost savings and lower power consumption. (2)由于2M低速光模块接收灵敏度高,传输距离更远,分光比更大。 (2) Since 2M low-rate optical receiver module sensitivity, over longer distances, greater splitting ratio.

附图说明 BRIEF DESCRIPTION

[0016]图1是根据本发明的一种无源光网络系统的拓扑图。 [0016] FIG. 1 is a topology diagram of a passive optical network system according to the invention.

[0017]图2是根据本发明的一种无源光网络系统的下行数据的工作流程示意图。 [0017] FIG. 2 is a schematic diagram of a workflow of a passive optical network system of the present invention, downlink data.

[0018]图3是根据本发明的一种无源光网络系统的上行数据的工作流程示意图。 [0018] FIG. 3 is a schematic work flow in a passive optical network system according to the present invention, the uplink data.

具体实施方式 Detailed ways

[0019]下面结合附图,对本发明的具体实施方式进行详细描述,但应当理解本发明的保护范围并不受具体实施方式的限制。 [0019] below with the accompanying drawings, specific embodiments of the present invention will be described in detail, it should be understood that the scope of the present invention is not limited to the specific embodiments.

[0020] 除非另有其它明确表示,否则在整个说明书和权利要求书中,术语“包括”或其变换如“包含”或“包括有”等等将被理解为包括所陈述的元件或组成部分,而并未排除其它元件或其它组成部分。 [0020] Unless otherwise expressly indicated otherwise, throughout the specification and claims, the terms "including" or a conversion such as "comprises" or "comprising" and the like will be understood to include the recited elements or components of , and does not exclude other elements or other components.

[0021] 如图1至图3所示,根据本发明具体实施方式的一种无源光网络系统,其基于串口通信协议及系统透传串口协议,且无源光网络系统的通信系统是点到多点的通信系统,无源光网络系统包含:无源光网络ODN、多个终端设备ONU以及局端设备0LT。 [0021] As shown in FIG. 1 to FIG. 3, a passive optical network system according to specific embodiments of the present invention, the serial protocol transparent transmission protocols and systems based on serial communication, and the communication system is a passive optical network system point multi-point communication system, a passive optical network system comprising: a passive optical network the ODN, the plurality of terminal devices and a central office device ONU 0LT. 无源光网络0DN包含光纤和无源分光器;多个终端设备0NU用户侧通信接口为串口,支持Uart (Universal Asynchronous Receiver/Transmitter)数据透传,且多个终端设备0NU采用2M低速光模块, 成本和功耗较低,接收灵敏度更好,终端设备0NU可以作为通信模块或独立采集器两种形式存在;以及局端设备0LT采用2M低速光模块,且局端设备0LT的网络侧接口支持Uart数据透传,局端设备0LT通过光纤向无源光网络0DN发送下行数据或接受来自用户侧多个终端设备0NU的上行数据。 0DN comprising passive optical network optical fibers and a passive optical splitter; a plurality of terminal devices 0NU user communication interface serial ports, supporting Uart (Universal Asynchronous Receiver / Transmitter) pass-through data, and a plurality of terminal devices 0NU of 2M low-rate optical module, lower cost and power consumption, better receiver sensitivity, may be present as a terminal device 0NU communication module or separate acquisition of two forms; and a central office device 0LT of 2M low-rate optical module and the central office equipment to support network-side interface 0LT Uart transparent data transmission, the central office device 0LT transmits downlink data to the passive optical network via fiber optic or 0DN receiving uplink data from the user side of the plurality of terminal devices 0NU. 其中,无源分光器的输入端口通过光纤与局端设备〇LT连接,且无源分光器的多个输出端口分别通过光纤与多个终端设备0NU连接,并且其中无源光网络系统中的数据以原始的帧格式进行传输而不进行封装。 Wherein, the passive optical splitter through an optical fiber input port connected 〇LT central office equipment, and a plurality of passive optical splitter output ports are connected through an optical fiber 0NU plurality of terminal devices, and the data wherein the passive optical network system original transmission frame format without encapsulation.

[0022] 优选地,高密度的局端设备0LT最多支持96个P0N口,局端设备0LT可以作为一个业务设备的通信模块形式存在,从而提供更高的设备集成度;无源分光器最大支持1:512分光比。 [0022] Preferably, the high density of the central office device 0LT P0N supports up to 96 ports, 0LT central office equipment may be present as a form of communication service module device, to provide a higher degree of integration apparatus; passive splitter maximum support 1: 512 splitting ratio.

[0023]优选地,发送下行数据是采用广播模式,接收上行数据是采用时分多址模式。 [0023] Preferably, the downlink data is transmitted in the broadcast mode, the uplink data is received using the time division multiple access mode.

[0024]优选地,发送下行数据的工作流程包含:在下行数据的工作时间窗口内,局端设备0LT利用无源分光器将下行数据推送到多个终端设备0NU,多个终端设备0NU都打开接收电路,接收下行数据并从串口转发出去;在下行数据的休眠时间窗口内,局端设备0LT不进行转发下行数据,且多个终端设备0NU都关闭接收电路。 [0024] Preferably, the downlink data transmission workflow comprises: a time window in the working downlink data, the central office device using a passive optical splitter 0LT downlink data pushed to a plurality of terminal devices 0NU, a plurality of terminal devices are turned 0NU a receiving circuit, and receives the downlink data forwarded from the serial port; sleep time window in the downlink data, the central office device 0LT not forward the downlink data, and a plurality of terminal devices are closed 0NU receiving circuit.

[0025]优选地,发送所述上行数据的工作流程包含:把上行数据的上行时间分成多个时间片,每个终端设备0NU获取相等长度的时间片;每个终端设备0NU只能在属于自己的时间片内向局端设备0LT发送上行数据,且在每个时间片上通过光纤只传送一个上行数据流至局端设备0LT,避免了终端设备0NU上行数据流之间的冲突,不会造成数据丢失;每个终端设备0NU在自己的时间片外,终端设备0NU关闭发送电路,从而降低功耗。 [0025] Preferably, said uplink data transmission workflow comprises: an uplink time the uplink data into a plurality of time slices, each terminal device 0NU sheet acquisition time of equal length; in each terminal apparatus can own 0NU within the time slice 0LT central office device transmits uplink data, and at each time a transfer sheet via an optical fiber just upstream to the central office equipment 0LT, to avoid conflicts between the upstream terminal apparatus 0NU, without loss of data ; 0NU each terminal apparatus outside their time slices, the terminal device transmits 0NU closed circuit, thereby reducing power consumption.

[0026]在实际应用中,本发明可广泛应用于电表、水表、燃气表等抄表系统的远程通信, 也可以应用于物联网、工矿、交通、楼宇等自动化控制系统的工业现场总线网络。 [0026] In practice, the present invention is widely applicable to telecommunication meter, water meter, gas meter reading system and the like, and may also be applied to things, industrial field bus network of industrial automation control system, transportation, building and the like. 本发明的源光网络系统是基于串口通信协议及系统透传串口协议,不进行任何数据封装,通信系统是点到多点的通信系统,其局端设备0LT及终端设备0NU使用2M低速光模块,2M速率可以满足串口数据的带宽需求,相对于标准的1000M高速光模块,成本和功耗较低,而接收灵敏度更好,且无源分光器最大支持1:512分光比。 Source optical network system according to the present invention is based on serial communication protocol and a serial protocol transparent transmission system, without any encapsulation data, point to multipoint communication system is a communication system terminal equipment and the central office equipment 0LT 0NU using 2M low-rate optical module , to meet bandwidth requirements 2M serial data rate, with respect to high-speed optical module 1000M standard, lower cost and power consumption, and better receiver sensitivity, maximum support and a passive optical splitter 1: 512 splitting ratio.

[0027]综上所述,本发明的无源光网络系统,与串口光猫和工业以太网方案相比,具有如下有益效果:(1)无源光网络模式,节省了主干光纤资源和光模块的数量,降低了成本和功耗;(2)组网方式灵活,更适合工业总线复杂的网络环境;(3)减少了系统故障点,增加了可靠性,降低了维护成本。 [0027] In conclusion, passive optical network system according to the present invention, as compared with cats and light industrial Ethernet serial programs, has the following advantages: (1) passive optical network mode, saving resources and optical trunk fiber module number, reducing the cost and power; (2) flexible networking, more suitable for industrial bus complex network; (3) reduce the number of failure points, increases reliability and reduces maintenance costs. 本发明的无源光网络系统,与EP0N方案相比,具有如下有益效果: (1)无源光网络系统米用2M低速光模块,节省了成本,降低了功耗。 Passive optical network system according to the present invention, compared with EP0N embodiment, has the following advantages: (1) passive optical network system meters with 2M low-rate optical module, cost savings and lower power consumption. (2)由于2M低速光模块接收灵敏度高,传输距离更远,分光比更大。 (2) Since 2M low-rate optical receiver module sensitivity, over longer distances, greater splitting ratio.

[0028]前述对本发明的具体示例性实施方案的描述是为了说明和例证的目的。 [0028] The foregoing description of specific exemplary embodiments of the present invention for purposes of illustration and explanation. 这些描述并非想将本发明限定为所公开的精确形式,并且很显然,根据上述教导,可以进行很多改变和变化。 They are not intended to limit the invention to the precise form disclosed, and obviously, of the above teachings, many modifications and variations may be made. 对示例性实施例进行选择和描述的目的在于解释本发明的特定原理及其实际应用,从而使得本领域的技术人员能够实现并利用本发明的各种不同的示例性实施方案以及各种不同的选择和改变。 Exemplary embodiments were chosen and described to explain certain principles of the object of the present invention and its practical application, thereby enabling others skilled in the art to make and utilize various exemplary embodiments of the present invention and various select and change. 本发明的范围意在由权利要求书及其等同形式所限定。 The scope of the present invention is intended by the appended claims and their equivalents as defined.

Claims (6)

1. 一种无源光网络系统,其基于串口通信协议及系统透传串口协议,其特征在于,所述无源光网络系统包含: 无源光网络ODN,其包含光纤和无源分光器; 多个终端设备ONU,其用户侧通信接口为串口,支持Uart数据透传,且所述多个终端设备ONU采用低速光模块;以及局端设备OLT,其采用低速光模块,且所述局端设备〇LT的网络侧接口支持Uart数据透传,所述局端设备OLT通过所述光纤向所述无源光网络〇DN发送下行数据或接受来自用户侧所述多个终端设备ONU的上行数据; 其中,所述无源分光器的输入端口通过所述光纤与所述局端设备〇LT连接,且所述无源分光器的多个输出端口分别通过所述光纤与所述多个终端设备ONU连接,并且其中所述无源光网络系统中的数据以原始的帧格式进行传输而不进行封装。 1. A passive optical network system, which pass-through serial protocols and systems based on serial communication protocol, characterized in that the passive optical network system comprising: a passive optical network the ODN, which comprises optical fibers and a passive optical splitter; ONU plurality of terminal devices, which the user-side communication interface for the serial port, to support transparent transmission of data Uart, the plurality of terminal devices and a low-speed ONU optical module; and a central office equipment, OLT, a low-speed optical module and the central office network-side interface apparatus 〇LT Uart support transparent transmission of data, the central office apparatus OLT through the optical fiber to transmit downlink data or uplink data from the user side receiving the plurality of terminal devices to the ONU of PON 〇DN ; wherein the passive optical splitter input port of the optical fiber by the central office equipment 〇LT connection, the passive optical splitter and a plurality of output ports, respectively, through the optical fiber of the plurality of terminal devices ONU is connected, and the data wherein the passive optical network system to the original transmission frame format without encapsulation.
2. 根据权利要求1所述的无源光网络系统,其特征在于,所述多个终端设备〇NU的所述低速光模块及所述局端设备OLT的所述低速光模块均为2M低速光模块。 The passive optical network system according to claim 1, wherein said plurality of said low-rate optical module and the central office apparatus OLT terminal apparatus 〇NU low-speed optical module is a low-2M optical module.
3. 根据权利要求1所述的无源光网络系统,其特征在于,发送所述下行数据是采用广播模式,接收所述上行数据是采用时分多址模式。 The passive optical network system according to claim 1, wherein the downlink data is transmitted in the broadcast mode, the uplink data is received using the time division multiple access mode.
4. 根据权利要求1所述的无源光网络系统,其特征在于,所述无源分光器最大支持1: 512分光比。 The passive optical network system according to claim 1, characterized in that the passive optical splitter maximum support 1: 512 splitting ratio.
5. 根据权利要求3所述的无源光网络系统,其特征在于,发送所述下行数据的工作流程包含: 在所述下行数据的工作时间窗口内,所述局端设备OLT利用所述无源分光器将所述下行数据推送到所述多个终端设备ONU,所述多个终端设备ONU都打开接收电路,接收所述下行数据并从所述串口转发出去;和在所述下行数据的休眠时间窗口内,所述局端设备OLT不进行转发所述下行数据,且所述多个终端设备ONU都关闭接收电路。 The passive optical network system according to claim 3, wherein transmitting the downlink data workflow comprises: a time window in the working of the downlink data, the central office apparatus OLT using the free source beam splitter to the downlink data is pushed to the plurality of terminal devices ONU, the ONU plurality of terminal devices are turned on the receiving circuit, and receives the downlink data forwarded from the port; and in the downlink data the sleep time window, the central office apparatus OLT does not forward the downlink data, and the plurality of terminal devices are closed ONU receiving circuit.
6. 根据权利要求3所述的无源光网络系统,其特征在于,发送所述上行数据的工作流程包含: 把所述上行数据的上行时间分成多个时间片,每个所述终端设备ONU获取相等长度的所述时间片; 每个所述终端设备ONU只能在属于自己的所述时间片内向所述局端设备OLT发送所述上行数据,且在每个所述时间片上通过所述光纤只传送一个所述上行数据至所述局端设备OLT;和每个所述终端设备ONU在自己的所述时间片外,所述终端设备〇NU关闭发送电路。 6. The passive optical network system according to claim 3, wherein transmitting the uplink data workflow comprising: the time of the uplink data up into a plurality of time slots, each said terminal apparatus ONU obtaining the time slices of equal length; each terminal device belonging only ONU within the time slice own the central office apparatus OLT sends the uplink data, and by the time slice in each of the an optical fiber transmission only the uplink data to the central office equipment the OLT; and each of the ONU terminal device outside the own time slice, the transmitting terminal device 〇NU closed circuit.
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