WO2013056590A1 - 支持CATV光接入的融合EoC功能的EPON光网络单元 - Google Patents

支持CATV光接入的融合EoC功能的EPON光网络单元 Download PDF

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Publication number
WO2013056590A1
WO2013056590A1 PCT/CN2012/079879 CN2012079879W WO2013056590A1 WO 2013056590 A1 WO2013056590 A1 WO 2013056590A1 CN 2012079879 W CN2012079879 W CN 2012079879W WO 2013056590 A1 WO2013056590 A1 WO 2013056590A1
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Prior art keywords
eoc
optical
catv
signal
chip
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PCT/CN2012/079879
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English (en)
French (fr)
Inventor
郑艳烈
张晓丰
张莹丽
陈志勇
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烽火通信科技股份有限公司
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Publication of WO2013056590A1 publication Critical patent/WO2013056590A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2801—Broadband local area networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4604—LAN interconnection over a backbone network, e.g. Internet, Frame Relay
    • H04L12/462—LAN interconnection over a bridge based backbone

Definitions

  • the present invention relates to the application of EoC (Ethernet over Coaxial cable) in the field of optical communication, and particularly relates to an EPON with integrated EoC function supporting CATV (Cable Television) optical access.
  • EoC Electronic Over Coaxial cable
  • CATV Consumer Television
  • ONU Optical Network Unit
  • the EoC Coaxial Ethernet System is a series of products designed for broadcast and cable network operators to realize bidirectional transmission of data based on the existing coaxial cable distribution network. It is a HFC (Hybrid Fiber-Coaxial, Hybrid Fiber-Coaxial Hybrid Network).
  • the network realizes an economical and efficient solution for two-way network transformation.
  • the EoC system can work in both active and passive cable distribution network environments, enabling rapid implementation of digital TV return channels, high-speed Internet access, high-definition video on demand, and IPTV (Internet Protocol Television, IP) with minimal existing network modification.
  • TV, VoIP Voice of Internet Protocol
  • the EoC headend device uses coaxial cable and fiber optics, and uplinks CATV (Cable Television) and IP (Internet Protocol) signals. After signal coupling, it is connected to the downstream coaxial cable distribution network.
  • EoC access devices With the widespread use of EoC technology, the form of EoC access devices is increasing.
  • the EoC products currently seen are EoC headend devices that support CATV electrical signal input. These devices are more suitable for retrofitting old cells. For newly built cells, fiber access to the unit building has been achieved. Therefore, for the new cell EoC access scenario, if the access mode of the CATV electrical signal is still used, not only the existing fiber resources of the cell are wasted, but also It is necessary to install multi-level CATV electrical signal amplifiers and related supporting equipments in the community, and the increased intermediate links make the system energy consumption become large and the network environment is complicated, which ultimately leads to network operation and maintenance difficulties after EoC access. Summary of the invention
  • the object of the present invention is to overcome the deficiencies of the above background art, and provide an EPON optical network unit that supports the EoC function of CATV optical access, and provides reliable without adding a new CATV optical receiver and related supporting equipment.
  • the IP data and CATV signal access not only reduce the installation and construction process of the equipment, but also reduce the cost and complexity of the networking, and reduce the operation and maintenance costs; the network adaptability is strong, the interoperability with the terminal equipment is strong, and the networking is flexible. , applicable to different EoC access scenarios.
  • the EPON optical network unit with the EoC function supporting the CATV optical access comprises an Ethernet passive optical network EPON remote machine, and is used for completing the device configuration management and the passive optical network PON connection of the Internet protocol IP data.
  • it also includes an Ethernet technology EoC headend module based on coaxial cable transmission, a CATV optical receiving module and an interboard connector, and the EPON remote unit and the EoC head end module are connected by an interboard connector.
  • the inter-board connector is configured to transmit 100 Mbps Ethernet data, a reset signal, a power, a ground, and a port connection status indication signal, where the EoC head end module is used to perform mutual conversion of Ethernet data and EoC low frequency data, and EoC Coupling of high frequency/low frequency data; the CATV light receiving module is used to perform conversion of a CATV optical signal to a CATV radio frequency signal.
  • the EPON remote unit includes an optical module, a PON chip, a switch chip, and a network processor, and the optical module is connected to the optical line terminal device OLT through an optical fiber, and is configured to receive an optical signal of the OLT, and The received optical signal is photoelectrically converted, and the converted electrical signal is sent to the PON chip; the PON chip is used for performing serial-to-parallel conversion on the converted electrical signal and then sending it to the switching chip; The switch chip is used to complete data exchange; the network processor is used to manage and configure the PON chip and the switch chip and the light receiving module.
  • the optical module includes a serial-to-parallel conversion interface, and the optical module sends the electrical signal after the photoelectric conversion to the PON chip through the serial-to-parallel conversion interface;
  • the PON chip includes a gigabit medium independent interface GMII, The PON chip sends the serial-to-parallel converted data to the switching chip through the GMII interface.
  • the CATV optical receiving module provides an I2C interface
  • the network processor reads out the optical power of the CATV optical signal and the level of the CATV electrical signal through the I2C interface.
  • the EoC head end module includes a medium access control MAC chip supporting the Home Power Line Network Alliance HomePlug AV standard, and a line driver chip, a balanced/unbalanced transformer, and an EoC duplexer used in conjunction with the MAC chip.
  • the MAC chip is used to complete 1024 quadrature amplitude modulation QAM
  • the line driver chip is used to complete data shaping and amplification
  • the balance/unbalanced transformer is used to perform balanced/unbalanced conversion of low frequency EoC signals.
  • the EoC duplexer is used to couple the EoC low frequency signal to the cable TV CATV signal.
  • a 100M physical layer chip PHY is connected between the inter-board connector and the MAC chip, and the 100M PHY chip is used to change the 100M Ethernet signal passing through the inter-board connector into a medium independent. Interface data.
  • the MAC chip includes a UI interface, and the data is sent to the MAC chip through the UI interface.
  • the EPON optical network unit is provided with a radio frequency output port, and the EoC duplexer in the EoC head end module performs the coupling of the EoC low frequency signal and the CATV signal, and is output by the radio frequency output port.
  • the coaxial network transmission is sent to the EoC terminal device.
  • the EPON optical network unit is further provided with a CATV optical receiving port, and the CATV optical receiving port sends the received CATV optical signal to the built-in CATV optical receiving module, and after completing the conversion of the photoelectric signal, the radio frequency is
  • the connector is connected to the RF connector inside the device through an RF cable to complete the access of the CATV signal.
  • the CATV optical receiving port adopts a square connector SC/angled physical end face APC type optical interface, and the interface type of the radio frequency output port is a metric F head.
  • the EPON ONU and EoC head-end integrated device of the present invention has a built-in CATV optical receiving module without increasing the size of the device, which not only reduces the installation and construction process of the device, but also reduces the networking cost and complexity. Reduced operation and maintenance costs.
  • the EoC access technology of the present invention supports the P1901 standard of the IEEE (Institute of Electrical and Electronics Engineers), and is compatible with the previous generation of products, protects the user's investment, and has strong network adaptability. Interoperability with terminal devices. Since the CATV optical signal transmission loss is small, the RF signal output by the device does not need to pass through the CATV electric amplifier to provide a reliable CATV signal to 50-60 users.
  • the CATV optical receiving module of the present invention provides an I2C interface, and can acquire and adjust related parameters of the CATV optical receiving module from the network management, and the functional interface not only solves the problem that the existing CATV optical machine cannot be managed, but also can be targeted
  • the actual application scenario is to adjust the output level of the CATV optical receiver module to facilitate networking and operation and maintenance.
  • the CATV optical receiving module of the present invention selects an SC (Square Connector, Square Connector) / APC (Angled Physical Contact) type optical interface to minimize the reflected signal of the optical interface to the CATV signal. The effect is to ensure efficient reception of CATV optical signals.
  • the present invention can support a PON (Passive Optical Network) uplink, and can also support Ethernet uplinking and flexible networking, and is applicable to different EoC access scenarios.
  • the invention has obvious advantages in reliability, maintainability and serviceability, and is a unified platform of multiple systems, and has a wide application scenario.
  • FIG. 1 is a schematic structural view of an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a connection to a peripheral network according to an embodiment of the present invention. detailed description
  • an EPON ONU that supports CAV optical access and integrates EoC functions, including an EPON remote unit, an EoC head end module, a CATV optical receiving module, and an inter-board connector, and an EPON remote unit are provided.
  • the EoC head end module is connected through an inter-board connector, wherein the EPON remote unit is used for device configuration management and PON access and EoC access of IP data, and the inter-board connector is used for transmitting 100 Mbps Ethernet data and reset signals.
  • EoC head module is used to complete the conversion of Ethernet data and EoC low frequency data, and EoC high frequency / low frequency data coupling;
  • CATV light receiving module is used to complete the CATV optical signal to Conversion of CATV RF signals.
  • the EPON remote unit includes an optical module, a PON chip, a switch chip, and a network processor.
  • the optical module includes a serial-to-parallel conversion interface
  • the PON chip includes a GMII (Gigabit Media Independent Interface).
  • the module is connected to an OLT (Optical Line Terminal) through an optical fiber, and is configured to receive an optical signal of the OLT, and perform photoelectric conversion on the received optical signal, and send the converted electrical signal to the PON chip through a serial-to-parallel conversion interface.
  • OLT Optical Line Terminal
  • the serial-to-parallel converted data is sent to the switching chip through the GMII interface; the switching chip is used to complete data exchange; the network processor is used for the PON chip and the switching chip and the optical receiving module Manage and configure.
  • the CATV optical receiving module receives the signal from the CATV optical fiber through the CATV optical port (SC/APC) of the device, and internally performs the photoelectric conversion of the CATV signal and the shaping of the CATV electrical signal.
  • the CATV optical receiver provides an I2C interface, and the network processor of the device can read the optical power of the CATV optical signal and the level of the CATV electrical signal through the I2C interface.
  • the EoC headend module includes a MAC (Medium/Media Access Control) chip supporting the HomePlug AV (HomePlug Powerline Alliance) standard, and a line driver chip for use with the MAC chip.
  • the MAC chip includes a Independent (Media Independent Interface) interface, and a 100 Mbps PHY (Physical Layer) chip is connected between the inter-board connector and the MAC chip.
  • the mega PHY chip converts the 100 Mbps Ethernet signal through the inter-board connector into ⁇ data, and the ⁇ data is sent to the MAC chip through the ⁇ interface.
  • the MAC chip is used to complete 1024QAM (Quadature Amplitude Modulation), the line driver chip is used to complete data shaping and amplification, and the balanced/unbalanced transformer is used to perform balanced/unbalanced conversion of low frequency EoC signals.
  • EoC dual The tool is used to complete the coupling of the EoC low frequency signal to the cable TV CATV signal.
  • the PON port of the embodiment of the present invention is connected to the OLT device through an optical fiber, and the IP data is uplinked.
  • EPON ONU also has an RF output port and a CATV optical receiving port.
  • the CATV optical receiving port uses SC (Square Connector, Square Connector) / APC (Angled Physical Contact).
  • Type optical interface the interface type of the RF output port is a metric F head.
  • the CATV optical receiving port sends the received CATV optical signal to the built-in CATV optical receiving module. After the photoelectric signal is converted, the RF connector is connected to the RF connector inside the device through the RF cable to complete the access of the CATV signal.
  • the RF output port is connected to the coaxial cable distribution network by a coaxial cable to achieve hybrid access of EoC data and CATV signals.
  • the EoC duplexer in the EoC headend module completes the coupling of the EoC low-frequency signal and the CATV signal, and then outputs it from the RF output port and transmits it to the EoC terminal device via the coaxial network.
  • EoC is a general term for transmitting Ethernet data technology on coaxial cable.
  • the working principle is to use the existing cable TV coaxial cable network to add Ethernet data channel outside the CATV transmission spectrum, so that the same coaxial cable can be used for users.
  • Video, data and voice services are also available.
  • the downlink transmits CATV and data signals, and transmits data signals in the uplink direction, providing a return channel for the two-way digital television platform.
  • the invention is a fusion device of EPON ONU and EoC technology, which is a module for adding EoC function on a traditional EPON ONU device, and then a built-in CATV optical receiving module, and realizes Ethernet uplink of data and Ethernet data through a chip with EoC function. Interconversion with EoC low frequency data.
  • the uplink data port of the module of the EoC function is connected to the port of the switch chip of the EPON ONU part, and the convergence is completed through a certain packet filtering and data forwarding mechanism to realize the integration of the EPON ONU device and the EoC device;
  • Unified management that is, the management of EPON ONU and EoC terminal equipment by EPON OLT equipment is realized by one network management system.
  • the embodiment of the present invention selects the HomePlug AV in the low frequency modulation scheme, as shown in FIG. 1, the specific working principle is as follows:
  • the optical module receives the data stream sent from the OLT from the EPON interface, enters the PON chip through the impedance matching circuit, and the serial data is completed in the PON chip.
  • the PMA (Physical Medium Attachment) layer and the EPON specific MAC layer work, exchange data with the switch chip through the GMII interface, and then the data enters the EoC chipset, that is, the MAC chip + AFE (Analog Front End, analog front end chip
  • the modulation of the Ethernet signal and the balanced unbalanced conversion are completed, and the EoC low frequency signal is transmitted.
  • the CATV electrical signal is transmitted from the coaxial cable through the EoC duplexer and sent to the EoC terminal device via the coaxial cable network.
  • the (EoC+CATV) data signal from the EoC terminal device is transmitted to the EoC head module of the device through the coaxial cable network.
  • the EoC headend module separates the EoC signal and the CATV signal through the EoC duplexer.
  • the separated EoC signal passes through the EoC chipset (MAC chip + AFE chip), and the EoC signal is demodulated to be converted into an Ethernet signal.
  • the EoC header After the EoC header After the ⁇ interface of the end module is sent to the switch chip to complete the data exchange, it enters the uplink burst data queue of the PON chip, and the PON chip sends the data to the optical module for transmission (to the OLT device).
  • the embodiment of the invention is an all-in-one machine that supports CATV optical access and has the functions of EPON ONU and EoC head end.
  • the main function is to realize the EPON ONU function, realize the access of the CATV optical signal, and complete the function of the EoC head end device.
  • the CATV optical signal is converted into an electrical signal by the CATV optical receiving module, the CAV signal and the EoC low frequency are completed by the EoC duplexer.
  • the signal is coupled and sent to the RF connector output of the device for reliable access to data and CATV optical signals.
  • the device In order to install the device flexibly, the device is designed to be in the front outlet mode.
  • the indicator light and user interface of the device are on the front panel of the device.
  • the device provides the following device operation status indicators:
  • EoC The device is connected to the physical layer of the terminal device.
  • the PON port of the device receives normal/abnormal indicator light.
  • Equipment CATV light receiving module receives normal light / no light receiving indicator.
  • the interfaces provided by the device include: local commissioning serial port, commissioning network port, EPON ONU optical interface, CATV electrical signal access port, output port of CATV signal and EoC low-frequency signal coupling, power supply and switch (220V AC power supply mode) And the protective ground terminal, as follows:
  • This device provides a CATV optical receiving port (interface type: SC/APC).
  • the receiving level ranges from [-8dBm, 2dBm]. When the receiving level exceeds the receiving level range, the CATV signal quality will be affected.
  • This device provides a mixed output port (OUT) of EoC low frequency signal and CATV signal.
  • the interface type is metric F header, so as to adapt to the connector in the current radio and television network, complete the service connection. .
  • the signal level of the EoC low frequency part of this device is approximately 110dBuV.
  • the device provides a PON interface, and the optical fiber and OLT are built in through the built-in optical module.
  • the device is connected to complete the communication between the OLT and the ONU to realize optical access of the data signal.
  • the receiving level of the PON port is within [-3dbm, -27dbm].
  • This device provides four Gigabit Ethernet interfaces reserved for function. This interface can implement device cascading or device networking.
  • the device provides a CONFIG port as a local management network port and a serial port to facilitate device commissioning.
  • This unit provides vents and fans for heat dissipation.
  • the embodiment of the present invention is located in a FTTB (Fiber-to-Building) type device, and can be flexibly placed in a central computer room or a unit corridor according to different user access requirements.
  • FTTB Fiber-to-Building
  • the maximum number of user terminals supported by the device is 64.
  • the functional requirements of the CATV optical receiving module built in the embodiment of the present invention are as follows:
  • CATV optical receiver module output level access loss (ie loss from the radio output port of the device to the user terminal) + home level.
  • the CATV optical receiving port needs to meet the relevant indicators of the radio and television to the corridor type CATV optical receiving module.
  • the CATV optical receiving module selects an optical interface of the SC/APC type.
  • the power consumption of the CATV optical receiver module is less than 5W, and the heat-dissipating housing is installed to ensure reasonable heat dissipation. Light reception is considered in order to minimize the power consumption of the CATV light receiving module
  • the module provides the required multi-level power supply.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Optical Communication System (AREA)

Abstract

本发明公开了一种支持CATV光接入的融合EoC功能的EPON光网络单元，包括EPON远端机、EoC头端、CATV光接收模块和板间连接器，EPON远端机与EoC头端通过板间连接器相连，EPON远端机完成设备配置管理和IP数据的PON接入，板间连接器传输百兆以太网数据、复位信号和端口连接状态指示信号，EoC头端完成以太网数据与EoC低频数据的相互转换，以及EoC高频/低频数据的耦合；CATV光接收模块用于完成CATV光信号到CATV射频信号的转换。本发明在无需增加新的CATV光接收机及配套设备的情况下，提供可靠的IP数据和CATV信号接入，减少了HFC的组网成本、网络繁杂度和施工工序。

Description

支持 CATV光接入的融合 EoC功能的 EPON光网络单元 技术领域
本发明涉及光通信领域中 EoC (Ethernet over Coaxial cable,基于 同轴电缆传输的以太网技术） 的应用， 特别是涉及一种支持 CATV ( Cable Television , 有线电视） 光接入的融合 EoC 功能的 EPON (Ethernet Passive Optical Network,以太网无源光网络） ONU (Optical Network Unit, 光网络单元）。 背景技术
EoC 同轴以太网系统是专门为广电有线网络运营商设计的基于 现有同轴电缆分配网实现双向传输数据的系列产品， 是一种 HFC (Hybrid Fiber-Coaxial, 光缆 -同轴电缆混合网） 网络实现双向网改 的经济、高效的解决方案。 EoC系统可以工作于有源和无源电缆分配 网环境，在最小现有网改施工的情况下，快速实现数字电视回传通道、 高速互联网接入、 高清视频点播、 IPTV (Internet Protocol Television, IP电视）、 VoIP (Voice of Internet Protocol, IP电话） 等业务。 EoC 头端设备使用同轴电缆和光纤， 上行连接 CATV (Cable Television, 有线电视） 和 IP (Internet Protocol, 互联网协议）信号， 通过信号耦 合以后与下行方向的同轴电缆分配网相连接。
随着 EoC技术的广泛应用， EoC接入设备的形态也日渐增多。 目前所见的 EoC产品均为支持 CATV电信号输入的 EoC头端设备， 这类设备比较适用于旧小区的改造。对于新建的小区， 已经实现了光 纤接入到单元楼。 所以， 对于新的小区 EoC接入场景， 如果仍然按 照 CATV电信号的接入模式，不仅浪费小区已有的光纤资源，而且还 需要在小区内部安装多级 CATV电信号放大器以及相关的配套设备， 增多的中间环节， 使得系统能耗变大、 线网环境繁杂， 最终导致 EoC 接入后网络运维困难。 发明内容
本发明的目的是为了克服上述背景技术的不足， 提供一种支持 CATV光接入的融合 EoC功能的 EPON光网络单元， 在无需增加新 的 CATV光接收机以及相关配套设备的情况下， 提供可靠的 IP数据 和 CATV信号接入，不仅缩减了设备的安装施工工序，而且降低了组 网成本和繁杂度， 减少了运维成本； 网络适应性强， 与终端设备的互 通性强， 组网灵活， 适用于不同的 EoC接入场景。
本发明提供的支持 CATV光接入的融合 EoC功能的 EPON光 网络单元， 它包括以太网无源光网络 EPON远端机， 用于完成设 备配置管理和互联网协议 IP数据的无源光网络 PON接入和 EoC 接入， 它还包括基于同轴电缆传输的以太网技术 EoC头端模块、 CATV光接收模块和板间连接器，所述 EPON远端机与 EoC头端模 块通过板间连接器相连， 所述板间连接器用于传输百兆以太网数 据、 复位信号、 电源、 地和端口连接状态指示信号， 所述 EoC头 端模块用于完成以太网数据与 EoC低频数据的相互转换，以及 EoC 高频 /低频数据的耦合； 所述 CATV光接收模块用于完成 CATV光 信号到 CATV射频信号的转换。
在上述技术方案中， 所述 EPON远端机包括光模块、 PON芯 片、 交换芯片和网络处理器， 所述光模块通过光纤与光线路终端 设备 OLT连接， 用于接收 OLT的光信号， 并对接收的光信号进行 光电转换， 将转换得到的电信号送到 PON芯片； 所述 PON芯片 用于对所述转换得到的电信号进行串并转换后送至交换芯片； 所 述交换芯片用于完成数据交换； 所述网络处理器用于对 PON芯片 和交换芯片以及光接收模块进行管理及配置。
在上述技术方案中， 所述光模块包括串并转换接口， 光模块 通过所述串并转换接口将完成光电转换后的电信号送至 PON 芯 片； 所述 PON芯片包括吉比特媒质独立接口 GMII, PON芯片通 过 GMII接口将进行串并转换后的数据送至交换芯片。
在上述技术方案中， 所述 CATV光接收模块提供 I2C接口， 网络处理器通过 I2C接口读出 CATV光信号的光功率以及 CATV 电信号的电平。
在上述技术方案中， 所述 EoC头端模块包括支持家庭电力线 网络联盟 HomePlug AV标准的介质访问控制 MAC芯片、 及配合 所述 MAC芯片使用的线驱芯片、 平衡 /非平衡变压器和 EoC双工 器， 所述 MAC芯片用于完成 1024正交幅度调制 QAM, 所述线驱 芯片用于完成数据的整型和放大， 所述平衡 /非平衡变压器用于完 成低频 EoC信号的平衡 /非平衡转换，所述 EoC双工器用于完成 EoC 低频信号与有线电视 CATV信号的耦合。
在上述技术方案中，所述板间连接器与 MAC芯片之间连接有 百兆物理层芯片 PHY,所述百兆 PHY芯片用于将通过板间连接器 的百兆以太网信号变为媒质独立接口 ΜΠ数据。
在上述技术方案中， 所述 MAC芯片包括 ΜΠ接口， 所述 ΜΠ 数据通过 ΜΠ接口送至 MAC芯片。
在上述技术方案中， 所述 EPON光网络单元设有射频输出端 口，所述 EoC头端模块中的 EoC双工器完成 EoC低频信号与 CATV 信号的耦合后， 由所述射频输出端口输出， 经同轴网络传输送至 EoC终端设备。 在上述技术方案中， 所述 EPON光网络单元还设有 CATV光 接收端口， 所述 CATV光接收端口将接收的 CATV光信号送至内 置的 CATV光接收模块， 完成光电信号的转换后， 由射频连接器 通过射频线连接到设备内部的射频接头， 完成 CATV信号的接入。
在上述技术方案中， 所述 CATV光接收端口采用方形连接器 SC/带角度的物理端面 APC类型的光接口，所述射频输出端口的接 口类型为公制 F头。
与现有技术相比， 本发明的优点如下：
( 1 ) 本发明的 EPON ONU和 EoC头端一体化设备在不增加设 备体积的情况下， 内置了 CATV光接收模块，不仅缩减了设备的安装 施工工序， 而且降低了组网成本和繁杂度， 减少了运维成本。
(2)本发明的 EoC接入技术支持 IEEE (Institute of Electrical and Electronics Engineers， 美国电气和电子工程师协会 ) 的 P1901标准， 并能兼容上一代的产品， 保护用户的投资， 而且网络适应性强， 与终 端设备的互通性强。 由于 CATV光信号传输衰耗小，所以本设备输出 的射频信号无需经过 CATV电放大器给 50-60户用户提供品质可靠的 CATV信号。
(3 ) 本发明中的 CATV光接收模块提供 I2C接口， 可以从网管 获取并调整 CATV光接收模块的相关参数，该功能接口不仅解决了以 往存在的 CATV光机无法管理的问题，而且还可以针对实际的应用场 景， 来调整 CATV光接收模块的输出电平， 以方便组网和运维。
(4) 本发明的 CATV光接收模块选用 SC (Square Connector, 方形连接器） /APC (Angled Physical Contact, 带角度的物理端面） 类型的光接口，可以最大限度降低光接口的反射信号对 CATV信号的 影响， 以保证 CATV光信号的有效接收。 (5 ) 本发明可以支持 PON (Passive Optical Network, 无源光网 络） 上联， 也可以支持以太网上联， 组网灵活， 适用于不同的 EoC 接入场景。 总之， 本发明在可靠性、 可维护性可服务性方面都具有明 显的优势， 是一个多系统统一的平台， 具有广阔的应用场景。 附图说明
图 1为本发明实施例的结构示意图。
图 2为本发明实施例与外围网络连接的示意图。 具体实施方式
下面结合附图及实施例对本发明作进一步的详细描述。
参见图 1所示， 本发明实施例提供的支持 CATV光接入的融合 EoC功能的 EPON ONU,包括 EPON远端机、 EoC头端模块、 CATV 光接收模块和板间连接器， EPON远端机与 EoC头端模块通过板间 连接器相连， 其中， EPON远端机用于完成设备配置管理和 IP数 据的 PON接入和 EoC接入，板间连接器用于传输百兆以太网数据、 复位信号、 电源、 地和端口连接状态指示信号， EoC头端模块用于 完成以太网数据与 EoC低频数据的相互转换，以及 EoC高频 /低频 数据的耦合； CATV光接收模块用于完成 CATV光信号到 CATV 射频信号的转换。
参见图 1所示， EPON远端机包括光模块、 PON芯片、 交换芯 片和网络处理器， 光模块包括串并转换接口， PON芯片包括 GMII ( Gigabit Media Independent Interface, 吉比特媒质独立接口）， 光 模块通过光纤与 OLT ( Optical Line Tterminal, 光线路终端设备） 连接， 用于接收 OLT的光信号， 并对接收的光信号进行光电转换， 通过串并转换接口将转换得到的电信号送到 PON芯片； PON芯片 对转换得到的电信号进行串并转换后，通过 GMII接口将进行串并 转换后的数据送至交换芯片； 交换芯片用于完成数据交换； 网络 处理器用于对 PON芯片和交换芯片以及光接收模块进行管理及配 置。
CATV光接收模块通过设备的 CATV光口 （SC/APC) 接收干 线 CATV光纤送来的信号， 在内部完成 CATV信号的光电转换以 及 CATV电信号的整型后送出。 CATV光接收机提供 I2C接口，本 设备的网络处理器可以通过 I2C接口读出 CATV光信号的光功率 以及 CATV电信号的电平。
参见图 1 所示， EoC 头端模块包括支持 HomePlug AV (HomePlug Powerline Alliance, 家庭电力线网络联盟）标准的 MAC ( Medium/MediaAccess Control , 介质访问控制） 芯片、 及配合 MAC芯片使用的线驱芯片、 平衡 /非平衡变压器和 EoC双工器， MAC芯片包括 ΜΠ (Media Independent Interface, 媒质独立接口 ) 接口， 板间连接器与 MAC 芯片之间连接有百兆 PHY ( Physical Layer, 物理层芯片）芯片， 百兆 PHY芯片将通过板间连接器的百 兆以太网信号变为 ΜΠ数据， ΜΠ数据通过 ΜΠ接口送至 MAC芯 片。 MAC 芯片用于完成 1024QAM ( Quadrature Amplitude Modulation, 正交幅度调制）， 线驱芯片用于完成数据的整型和放 大，平衡 /非平衡变压器用于完成低频 EoC信号的平衡 /非平衡转换， EoC双工器用于完成 EoC低频信号与有线电视 CATV信号的耦合。
参见图 2所示， 本发明实施例的 PON 口通过光纤连接到 OLT 设备，完成 IP的数据上联。 EPON ONU还设有射频输出端口和 CATV 光接收端口， CATV光接收端口采用 SC ( Square Connector, 方形 连接器） /APC ( Angled Physical Contact, 带角度的物理端面） 类 型的光接口，射频输出端口的接口类型为公制 F头。 CATV光接收 端口将接收的 CATV光信号送至内置的 CATV光接收模块， 完成 光电信号的转换后， 由射频连接器通过射频线连接到设备内部的 射频接头， 完成 CATV信号的接入。 射频输出端口由同轴电缆连 接到同轴电缆分配网， 实现 EoC数据和 CATV信号的混合接入。 EoC头端模块中的 EoC双工器完成 EoC低频信号与 CATV信号的 耦合后，由射频输出端口输出，经同轴网络传输送至 EoC终端设备。
本发明实施例的原理详细阐述如下：
EoC是在同轴电缆上传输以太网数据技术的统称，工作原理是利 用现有的有线电视同轴电缆网络，在 CATV传输频谱外加入以太网数 据通道， 以使同一根同轴电缆能为用户同时提供视频、数据和语音服 务。其下行方向传输 CATV和数据信号， 上行方向传输数据信号， 为 双向数字电视平台提供回传通道。
本发明作为 EPON ONU与 EoC技术的融合设备， 就是在传统的 EPON ONU设备上增加 EoC功能的模块，再内置 CATV光接收模块， 通过具有 EoC功能的芯片实现数据的以太网上联， 以及以太网数据 与 EoC低频数据的相互转化。 将 EoC功能的模块的上联数据口 与 EPON ONU部分的交换芯片的端口连接， 通过一定的包过滤和数 据转发机制，完成融合，实现 EPON ONU设备与 EoC设备的一体化； 同时在网管上实行统一管理， 即用一个网管实现 EPON OLT设备对 EPON ONU、 EoC终端设备的管理。
在 EoC 的众多调制方案中， 本发明实施例选定了低频调制方案 中的 HomePlug AV, 参见图 1所示， 具体工作原理如下：
( 1 )在下行方向， 光模块从 EPON接口接收到 OLT发送过来的 数据流， 经过阻抗匹配电路进入 PON芯片， 串行数据在 PON芯片完 成 PMA (Physical Medium Attachment, 物理媒质附加） 层及 EPON 特定 MAC层的工作， 通过 GMII接口与交换芯片进行数据交换， 然 后数据进入 EoC套片， 即 MAC芯片 +AFE (Analog Front End, 模拟 前端芯片） 完成以太网信号的调制以及平衡非平衡变换， 变为 EoC 低频信号， 与 CATV电信号经过 EoC双工器耦合从同轴电缆传输出 去， 经同轴电缆网络送至 EoC终端设备。
(2) 在上行方向， 来自 EoC终端设备的 （EoC+CATV) 数据信 号， 通过同轴电缆网络传至本设备的 EoC头端模块。 EoC头端模块 经过 EoC双工器分离出 EoC信号和 CATV信号，分离出来的 EoC信 号经过 EoC套片 （MAC芯片 +AFE芯片）， 完成 EoC信号的解调以 转换成以太网信号， 经过 EoC头端模块的 ΜΠ接口送至交换芯片完 成数据交换后， 进入 PON芯片的上行突发数据队列中， PON芯片将 数据送入光模块发送上去 （至 OLT设备）。
(3 )在没有数据发送时， OLT和本发明实施例以及 CNlKCoaxial Network Unit, 同轴电缆宽带接入单元）之间仍然有 MPCP (Multiple Point Control Protocol， 多点控制协议 ) 帧禾卩 OAM ( Operation Administration and Maintenance, 操作、 管理、 维护）帧的交互， 以维 持系统的正常联络， 保持 ONU和 CNU的在线。
本发明实施例是支持 CATV光接入同时兼具 EPON ONU和 EoC 头端功能的一体机， 主要功能是实现 EPON ONU功能、 实现 CATV 光信号的接入， 并完成 EoC头端设备的功能。 接收 EPON OLT 设备的数据， 完成宽带数据的 EPON接入， 然后把以太网数据送入 EoC头端模块， 实现以太网数据与 EoC数据的转换后， 经信号的整 型和放大， 送至 EoC双工器， 同时把 CATV光信号经过 CATV光接 收模块变成电信号以后， 由 EoC双工器完成 CATV信号和 EoC低频 信号耦合，送至设备的射频连接器输出，实现数据与 CATV光信号的 可靠接入。
为了灵活安装设备， 本设备设计为前出线的方式， 设备的指示灯 和用户接口都在设备的前面板上， 设备的左右侧有散热孔， 设备的左 侧设有散热孔， 右侧装有风扇， 保证设备的良好散热。
为了保证设备的可维护性以及组网方便，本设备提供以下设备运 行状态指示灯：
( 1 ) PWR: 设备电源正常 /异常指示灯。
(2) ACT: 设备 CPU运行正常 /异常指示灯。
(3 ) EoC: 设备与终端设备物理层连接建立 /没有建立指示灯。
(4) REG: 设备注册 /没有注册到 OLT指示灯。
(5 ) 设备 PON口收光正常 /异常指示灯。
(6) 设备 CATV光接收模块收光正常 /无收光指示灯。
本设备提供的接口包括： 本地调测串口、 调测网口、 EPON ONU 光接口、 CATV电信号接入端口、 CATV信号与 EoC低频信号耦合后 的输出端口、 电源和开关 （220V交流供电方式） 以及保护地端子， 具体说明如下：
( 1 )本设备提供一个 CATV光接收端口 （接口类型： SC/APC )， 接收电平的范围为 [-8dBm,2dBm]，当接收电平超出接收电平范围会影 响 CATV信号质量。
(2)本设备提供一个 EoC低频信号与 CATV信号混合输出端口 (OUT)o 为保证组网灵活， 接口类型为公制 F头， 以便与目前广电行 网中的连接头适配， 完成业务的连接。 本设备的 EoC低频部分的信 号电平约为 110dBuV。
( 3 )本设备提供一个 PON接口，通过内置光模块用光纤与 OLT 设备连接， 完成 OLT与 ONU之间的通信， 实现数据信号的光接入， PON口的接收电平在 [-3dbm,-27dbm]内。
(4) 本设备提供 4个功能预留的千兆以太网接口， 该接口可以 实现设备级联或者以设备的太网上联。
(5 ) 本设备提供一个 CONFIG口为本地管理网口和一个串口， 方便设备调测。
(6) 1个交流 220V电源开关和 1个交流 220V电源插座。
(7 ) 1个保护地接地座子。
(8) 本设备提供散热孔和风扇用来散热。
本发明实施例定位为 FTTB (Fiber To The Building,光纤到楼宇） 型设备， 根据不同的用户接入需求， 可以灵活放置在小区的中心机房 或者单元楼道。
根据本发明实施例的产品形态以及市场定位，本设备最大支持的 用户终端的数量为 64。 对本发明实施例内置的 CATV光接收模块的 功能要求如下：
( 1 ) CATV 光接收模块输出电平 =接入损耗 （即从本设备的射 频输出口到用户终端之间的损耗） +入户电平。
(2) 提供 I2C接口， 可以获取并调整 CATV光接收模块的相关 参数。
(3 ) CATV光接收端口需满足广电对楼道型 CATV光接收模块 的相关指标。
(4) 为了减少 CATV光接收模块的接收光功率损耗， CATV光 接收模块选用 SC/APC类型的光接口。
(5 ) CATV光接收模块的功耗小于 5W, 且加装散热外壳， 保证 合理散热。考虑到尽量减少 CATV光接收模块的功耗，所以给光接收 模块提供需要的多等级电源。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不 脱离本发明的精神和范围。这样， 倘若本发明的这些修改和变型属于 本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些 改动和变型在内。
本说明书中未作详细描述的内容属于本领域专业技术人员公知 的现有技术。

Claims

权 利 要 求 书
1、一种支持 CATV光接入的融合 EoC功能的 EPON光网络单元， 它包括以太网无源光网络 EPON远端机，用于完成设备配置管理和互 联网协议 IP数据的无源光网络 PON接入和 EoC接入， 其特征在于： 它还包括基于同轴电缆传输的以太网技术 EoC头端模块、 CATV光接 收模块和板间连接器， 所述 EPON远端机与 EoC头端模块通过板间 连接器相连， 所述板间连接器用于传输百兆以太网数据、 复位信号、 电源、 地和端口连接状态指示信号， 所述 EoC头端模块用于完成以 太网数据与 EoC低频数据的相互转换， 以及 EoC高频 /低频数据的耦 合； 所述 CATV光接收模块用于完成 CATV光信号到 CATV射频信 号的转换。
2、 如权利要求 1所述的支持 CATV光接入的融合 EoC功能的 EPON光网络单元，其特征在于，所述 EPON远端机包括光模块、 PON 芯片、交换芯片和网络处理器， 所述光模块通过光纤与光线路终端设 备 OLT连接， 用于接收 OLT的光信号， 并对接收的光信号进行光电 转换， 将转换得到的电信号送到 PON芯片； 所述 PON芯片用于对所 述转换得到的电信号进行串并转换后送至交换芯片；所述交换芯片用 于完成数据交换； 所述网络处理器用于对 PON芯片和交换芯片以及 光接收模块进行管理及配置。
3、 如权利要求 2所述的支持 CATV光接入的融合 EoC功能的 EPON光网络单元， 其特征在于， 所述光模块包括串并转换接口， 光 模块通过所述串并转换接口将完成光电转换后的电信号送至 PON芯 片； 所述 PON芯片包括吉比特媒质独立接口 GMII, PON芯片通过 GMII接口将进行串并转换后的数据送至交换芯片。
4、 如权利要求 2所述的支持 CATV光接入的融合 EoC功能的 EPON光网络单元， 其特征在于： 所述 CATV光接收模块提供 I2C接 口，网络处理器通过 I2C接口读出 CATV光信号的光功率以及 CATV 电信号的电平。
5、 如权利要求 1所述的支持 CATV光接入的融合 EoC功能的 EPON光网络单元，其特征在于：所述 EoC头端模块包括支持家庭电 力线网络联盟 HomePlug AV标准的介质访问控制 MAC芯片、及配合 所述 MAC芯片使用的线驱芯片、平衡 /非平衡变压器和 EoC双工器， 所述 MAC芯片用于完成 1024正交幅度调制 QAM,所述线驱芯片用 于完成数据的整型和放大， 所述平衡 /非平衡变压器用于完成低频 EoC信号的平衡 /非平衡转换，所述 EoC双工器用于完成 EoC低频信 号与有线电视 CATV信号的耦合。
6、 如权利要求 5所述的支持 CATV光接入的融合 EoC功能的 EPON光网络单元， 其特征在于： 所述板间连接器与 MAC芯片之间 连接有百兆物理层芯片 PHY, 所述百兆 PHY芯片用于将通过板间连 接器的百兆以太网信号变为媒质独立接口 ΜΠ数据。
7、 如权利要求 6所述的支持 CATV光接入的融合 EoC功能的 EPON光网络单元， 其特征在于， 所述 MAC芯片包括 ΜΠ接口， 所 述 ΜΠ数据通过 ΜΠ接口送至 MAC芯片。
8、 如权利要求 5所述的支持 CATV光接入的融合 EoC功能的 EPON光网络单元， 其特征在于： 所述 EPON光网络单元设有射频输 出端口， 所述 EoC头端模块中的 EoC双工器完成 EoC低频信号与 CATV信号的耦合后， 由所述射频输出端口输出， 经同轴网络传输送 至 EoC终端设备。
9、 如权利要求 8所述的支持 CATV光接入的融合 EoC功能的 EPON光网络单元，其特征在于：所述 EPON光网络单元还设有 CATV 光接收端口， 所述 CATV光接收端口将接收的 CATV光信号送至内 置的 CATV光接收模块，完成光电信号的转换后， 由射频连接器通过 射频线连接到设备内部的射频接头， 完成 CATV信号的接入。
10、 如权利要求 9所述的支持 CATV光接入的融合 EoC功能的 EPON光网络单元， 其特征在于： 所述 CATV光接收端口采用方形连 接器 SC/带角度的物理端面 APC类型的光接口， 所述射频输出端口 的接口类型为公制 F头。
PCT/CN2012/079879 2011-10-19 2012-08-09 支持CATV光接入的融合EoC功能的EPON光网络单元 WO2013056590A1 (zh)

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