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  1. 1. GPON Architecture _ Training outline GPON access GPON specifications Reference Standards and Protocols Huawei Product Availability System principle Activation in GPON GPON Terminal FTTx Scenario Brief Configuring
  2. 2. GPON Access Introduction This topic describes the definition and purpose of GPON access. Definition An x passive optical network (xPON) is a point-to-multipoint (P2MP) passive optical network. A typical xPON access system consists of three parts: - Optical line terminal (OLT) - Optical network unit (ONU) or optical network termination (ONT) - Optical distribution network (ODN) An ODN (including fibers and optical splitters) connects the OLT and the ONU/ONT.
  3. 3. GPON Access Purpose GPON adopts the passive optical transmission technology and is mainly applicable to the scenarios, such as fiber to the home (FTTH) and fiber to the building (FTTB) to provide various services: Voice Data Video Leased line Distributed service GPON supports high-bandwidth transmissions. This helps to break down the bandwidth bottleneck of the access over twisted pair cables and to meet the requirements for high-bandwidth services, such as high-definition TV (HDTV) and live programs. GPON supports long-reach access, which helps to extend the coverage and to reduce network nodes
  4. 4. Training outline GPON access GPON specifications Reference Standards and Protocols Huawei Product Availability System principle Activation in GPON GPON Terminal FTTx Scenario Brief Configuring
  5. 5. GPON Specifications This topic provides the specifications of the GPON access feature. The GPON access feature supports the following specifications: The system supports the service shelf to be fully configured with the GPBC/GPBD boards. Each GPBC board supports four GPON ports, each GPBD board supports eight GPON ports. The entire GPON board supports 8K service ports. Each GPON port of the GPBC board supports up to 64 ONUs/ONTs, and each GPON port of the GPBD board supports up to 128 ONUs/ONTs. The system supports up to 6144 ONUs/ONTs. The system supports the GEM (GPON Encapsulation Method) encapsulation. Each GPON port supports 4096 GEM ports. (The range of GEM port number that can be configured is from 128 to 3999. The others are reserved by the system.) Each GPON board supports up to 8192 GEM ports. Each PON port of the GPBC board supports up to 256 T-CONTs, and Each PON port of the GPBD board supports up to 1024 T-CONTs. Each PON port of the GPBC board supports up to 256 Non-Fix T-CONTs, and Each PON port of the GPBD board supports up to 512 Non-Fix T-CONTs.
  6. 6. GPON Specifications The system supports up to 512 T-CONT profiles and supports up to 32K T-CONTs. The GPON port supports a maximum downstream rate of 2.4 Gbit/s and upstream rate of 1.2 Gbit/s. The system supports a maximum 1:128 split ratio and supports Class B+ (28 dB). The system supports a maximum physical transmission distance of 20 km and a maximum logical transmission distance of 60 km. The GPON board supports the query of the CPU usage. The system supports the loopback on the ETH port and the E1 port of the ONT. The system supports the loopback on the GEM port of the OLT and the ONT. The system supports the loop line detection for the remote GEM port and the line detection for the ONT UNI port. The system can automatically allocate GEM port IDs. The system supports the configuration of the static routing for the GPON MDU. The system supports the query of the alarm information about a PON port of the GPON board through the CLI. The system can report the SN of a newly discovered ONT when the PON port is fully configured with 64 (in the case of the GPBC board)/128 (in the case of the GPBD board) ONTs.
  7. 7. Training outline GPON access GPON specifications Reference Standards and Protocols Huawei Product Availability System principle Activation in GPON GPON Terminal FTTx Scenario Brief Configuring
  8. 8. Reference Standards and Protocols The following lists the reference documents of GPON access: ITU-T G.984.1 General characteristics for Gigabit-capable Passive Optical Networks (GPON) ITU-T G.984.2 Gigabit-capable Passive Optical Networks (GPON): Physical Media Dependent (PMD) layer specification ITU-T G.984.3 Gigabit-capable Passive Optical Networks (GPON): Transmission convergence layer ITU-T G.984.4 Gigabit-capable Passive Optical Networks(GPON): ONT management and control interface specification
  9. 9. Training outline GPON access GPON specifications Reference Standards and Protocols Product Availability System principle Activation in GPON GPON Terminal FTTx Scenario Brief Configuring
  10. 10. Availability License Support The number of remote ONT ports supported by the MA5603T is under license. Therefore, the license is required for accessing the corresponding service Version Support Product Product MA5603T Version V800R007 Hardware Support - The GPBC/GPBD board supports the feature of GPON access. - The terminals support GPON upstream transmission.
  11. 11. Training outline GPON access GPON specifications Reference Standards and Protocols Product Availability System principle Activation in GPON GPON Terminal FTTx Scenario Brief Configuring
  12. 12. System principle GPON adopts the WDM transmission over an optical fiber. In compliance with ITU-T G.984.2, the upstream wavelength is 1310 nm, and the downstream wavelength is 1490 nm, which are used for bi-directional data transmissions over an optical fiber between the OLT and the ONUs/ONTs ,to separate the signals of different users at both directions over the same optical fiber, the following multiplexing technologies are adopted: The broadcast technology is adopted for downstream data stream. Each ONU/ONT receives only the data which belongs to it. The transmission rate is 2.4 Gbit/s. The TDMA technology is adopted for upstream data stream. Each ONU/ONT sends its data within the allocated timeslots. The transmission rate is 1.2 Gbit/s.
  13. 13. Principle A GPON consists of the physical layer, the TC framing sub-layer, and the TC encapsulation adaptation layer. When functioning as an OLT, the MA5603T is connected to the ONU/ONT in the downstream direction. The GPON encapsulation mode (GEM) frames are transmitted between the OLT and the ONU/ONT. A GEM frame is identified by the GEM port ID, and is carried by T-CONT in the upstream direction Figure 1 GPON multiplexing structure (GEM mode)
  14. 14. Principle DBA-profile Function This command is used to add a dynamic bandwidth assignment (DBA) profile. In the DBA profile, the upstream access bandwidth of the ONU is defined. The MA5600T dynamically adjusts the upstream access bandwidth allocated to the ONU according to the upstream access bandwidth requirements of the ONU. In this manner, the usage efficiency of the upstream access bandwidth of the PON system is improved. When the default DBA profile cannot meet the service requirements, run this command to add a DBA profile according to the service requirements. The default DBA profiles can be queried or modified, but cannot be deleted. If a profile is bound to a service, the profile cannot be deleted. Priorities of different bandwidth types are different. When allocating the bandwidth, the board allocates the fixed bandwidth and then the assured bandwidth. In this manner, the two bandwidth types are assured. If there is still bandwidths remaining, the remaining bandwidths are allocated to other bandwidth types. The value of the bandwidth you entered when adding the DBA profile will be adjusted downward to an integer multiple of 64. For example, if the entered bandwidth value is 1022 kbit/s, the actual bandwidth will be 960 kbit/s.
  15. 15. Principle DBA-profile Function Link By default, there are nine DBA profiles in the system with IDs ranging from 1 to 9. These profiles provide the typical traffic parameter values. For parameters in the nine DBA profiles, see the following figure. You can also run the display dba-profile command to query the parameters in each profile. The DBA profiles used in the EPON mode and in the GPON mode are the same. A DBA profile can be bound to the EPON port and GPON port at the same time.
  16. 16. Principle
  17. 17. Principle Assume that: Profile ID: 20 Profile name: dba_15M (that is, dba_assured bandwidth) Bandwidth type: Type3 Assumed bandwidth: 15 Mbit/s Maximum bandwidth: 30 Mbit/s To add such a DBA profile for a VoIP service so that the MA5600T dynamically adjusts the bandwidth allocated to the service according to the upstream burst service requirements of the ONU, do as follows:
  18. 18. Principle GEM Port A T-CONT comprises one or more GEM ports. Each GEM port carries one type of service stream. Thus, one T-CONT can carry one or more types of service streams. Each GEM port is identified by a unique Port-ID. The Port-ID ranges from 0 to 1023 and is globally allocated by the OLT. That is, each GEM port can be used by only one ONU/ONT connected to the OLT. The GEM port is used to identify the service port that carries the service stream between the OLT and the ONU/ONT. It is similar to the VPI/VCI of the ATM connection.
  19. 19. Training outline GPON access GPON specifications Reference Standards and Protocols Product Availability System principle Activation in GPON GPON Terminal FTTx Scenario Brief Configuring
  20. 20. Activation in GPON The activation process in GPON is controlled by the OLT. The ONU responds to the messages sent by the OLT. The activation process is as follows: 1. According to the requirement of the OLT, the ONU adjusts the level of the transmit optical power. 2. The OLT discovers the SN (Serial Number) of a new ONU. 3. The OLT allocates an ONU-ID to the ONU. 4. The OLT measures the phase of the up