The discovery phase includes an optional time period allowing for any local station to
accept or reject the configuration of the link peer OAM entity; for example, a particular
network node may require all its link peer stations to support the loopback capability.
Selection and implementation of such policies are not covered by and specified in the
respective IEEE standard and are left open for vendor-specific implementation. Such
enhancements are typically developed on top of the standard OAM protocol.
Link Performance Monitoring The OAM link monitoring administration tools target
detection and identification of link faults, where the detection mechanism utilizes the
Event Notification OAMPDU, sending link state??“related events to a Link Partner OAM
entity, relaying thus the information on the potential link problems. If the link partner
happens to be SNMP enabled, a SNMP trap could pass the OAMPDU to a remote entity.
There are a number of standard defined error events:
?– Errored symbol period (errored symbols per second) The total number
of symbol errors that occur during a specified period exceed a certain predefined
Passive Optical Networks (PONs) 169
threshold, degrading link quality and impairing data transmission capabilities.
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