Context
Generic object oriented substation event (GOOSE) is a mechanism defined in IEC 61850 for
rapidly transmitting events in a substation automation system. GOOSE packets are multicast
packets for communication between terminal units.
In the GPON type C single-homing protection mechanism, the two PON lines between an ONU
and an OLT work in active/standby mode and cannot forward packets at the same time.
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If the OLT detects that the upstream link to the active PON port is faulty, the OLT
automatically switches services to the upstream link to the standby PON port. In addition,
the OLT sends a PON section trace (PST) message to the ONU to notify the ONU of the
switching and switching cause over the uplink to the standby PON port, and instructs the
ONU to perform the switching.
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If the ONU detects that the downstream link to the active PON port is faulty, the ONU
automatically switches services to the downstream link to the standby PON port. In
addition, the ONU sends a PST message to the OLT to notify the OLT of the switching and
switching cause over the downlink to the standby PON port, and instructs the OLT to
perform the switching.
For details about the GPON type C protection mechanism, see
GPON Type C Protection
in
Feature Description
.
Service Requirements
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In a smart grid, terminal units collect the running status information, as well as monitoring
and control information about the power distribution system and send the information to
the master station system.
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The information collected by terminal units is transparently transmitted to the master station
system, and therefore the transmission network must be secure enough to ensure reliable
running of the smart grid.
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Terminal units must communicate with each other. This is because, when a breaker is
disconnected or the switch position of an isolator switch changes, a terminal unit must
directly send the change information to the measuring and monitoring device and the
substation monitoring system in real time. GOOSE can rapidly transmit events in a
substation automation system, and requires that ONUs connecting to the same or different
PON ports support Layer 2 interconnection.
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A terminal unit provides Ethernet access so an ONU can receive the collected information
over Ethernet.
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The information is transmitted over a GPON network.
Networking
shows an example network for configuring automatic transmission of site
information in the electrical power system over Ethernet, and the active and standby line
connections between the terminal units and the master station system. This example describes
how to configure the transmission for terminal unit A connected to ONU_A. The configuration
procedure for ONU_B is similar to that for ONU_A.
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ONU_A and ONU_B are connected to terminal units through a GE or FE autonegotiation
electrical port. After receiving messages from a terminal unit, ONU_A and ONU_B report
the messages to the OLT. The OLT forwards the messages to the master station system.
SmartAX MA5600T/MA5603T/MA5608T Multi-service
Access Module
Commissioning and Configuration Guide
17 Electrical Service Configuration
Issue 01 (2014-04-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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