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This another part of the GPON Principles lead us to know about the Management and the provisioning Modes of the GPON system
GPON PRINCIPLES
Management and Service Provisioning Modes of the GPON System
GPON Terminal Authentication
· In GPON authentication, the OLT authenticates the validity of an ONU based on the ONU SN or password, and rejects the access of unauthorized ONUs.
§ In the GPON system, only authorized and valid ONUs can access the PON system. In this way, carriers can implement flexible management and easy maintenance.
· The main authentication modes for the GPON ONU are as follows:
§ SN authentication (common authentication mode)
§ SN+Password authentication)
· SN authentication is an authentication mode in which the OLT matches only the SN of an ONU. The SN+Password authentication mode requires matching both the SN and password at the same time.
· After receiving the sequence code response message from the ONU, the OLT checks whether the ONU with the same SN is online. If an ONU with the same SN is online, the OLT reports an SN conflict alarm is reported to the CLI and NMS. Otherwise, the OLT directly allocates the specified ONU ID to the ONU.
· After the ONU enters the operation state:
§ For the ONU in SN authentication mode, the OLT does not request the password. The OLT directly configures a GEM port for the ONU to carry OMCI messages and enables the ONU to go online. The configuration can be automatically performed by the OLT so that the GEM port carrying OMCI messages is the same as the ONU ID. In addition, the OLT reports an ONU online alarm to the CLI or NMS.
§ For an ONU in SN + password authentication mode, the OLT sends a password request to the ONU and compares the password returned by the ONU with the locally configured password. If the password is the same as the locally configured password, the OLT directly configures a GEM port for the ONU to carry OMCI messages and enables the ONU to go online, and reports an ONU online alarm to the CLI or NMS. If the password is different from the local configuration, a password error alarm is reported to the CLI or NMS. In this case, even if the ONU auto-discovery function is enabled on the PON port, the OLT does not report the ONU auto-discovery, and sends the Deactivate_ONU-ID PLOAM message to deregister the ONU.
GPON Terminal Management Model
· The GPON System Manages ONUs through the OMCI management channel between the OLT and the ONUs.
§ ONU PnP and automatic service provisioning
§ ONUs remote central management.
· OMCI: ont terminal management and control interface
· SNMP: Simple Network Management Protocol
· ONU management in the GPON system is implemented through OMCI messages.
§ OMCI messages are mainly used for service layer management and maintenance, such as device hardware capability discovery, alarm maintenance information, and service capability configuration.
§ OMCI is a master-slave management protocol. The OLT is the master device, and an ONU is a slave device. After the ONU completes the registration process, an OMCI channel is established The OLT controls multiple ONUs connected to it through OMCI channels.
§ The OMCI supports offline configuration of ONUs. The ONU does not need to save the configurations locally, which facilitates service provisioning.
Common GPON Terminal Management Modes
· ONT management mode 1
§ In full OMCI mode, the internet access service, multicast service and voice are all delivered through OMCI
EMS: Element Management System
Voice services are delivered through the OMCI
· ONT management mode 2
§ The internet access service and multicast service are delivered through OMCI.
§ For the voice service, the OLT downloads the XML configuration file from the NMS through FTX
ü After downloading the configuration file from the NMS, the OLT issues the configuration file to the ONT through the OMCI channel.
· EMS: element management system
· For the voice service, an XML configuration file is downloaded from the NMS through FTP.
· The OLT downloads the XML configuration file of the voice service from the NMS in FTP mode and delivers the file to the ONT through the OMCI channel to complete the voice service configuration
· ONT management mode 3
§ The internet access service and multicast service are delivered through OMCI.
§ For the voice service, the OLT downloads the XML configuration file from the NMS through FTX
ü After downloading the configuration file from the NMS, the OLT issues the configuration file to the ONT through the OMCI channel.
· VLAN: virtual local area network
· MXU services are typically delivered by EMS
· ONT management mode 4
§ OMCI is still used for configuration, status, performance, and fault management at the PON link layer.
§ IP-based services (for example, Internet access and VoIP services) are managed by ACS in TR-69 mode.
· VoIP, RG, and PON indicate the VoIP service, gateway service (IP services are used as examples), and PON link layer management respectively
GPON Service Provisioning and Zero Terminal Configuration
· The GPON supports zero terminal configuration and terminal PnP, which reduces the manpower required for service provisioning and initial configuration of terminals.
· ONT PnP
§ Zero configuration
· Centralized ONT management
§ ONT remote diagnosis and batch upgrade
§ Remote maintenance and management of the ONT through OAM
· Automatic ONT service provisioning
Here finish the post but in the next, we will continue with the theme. Meanwhile, visit the following links:
https://forum.huawei.com/enterprise/en/huaweis-access-network-gpon-principles/thread/603932-100181
