PairGain PG-Flex, Manual

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PG-Flex System Overview
14
Alarms
PG-Flex generates major and minor alarms in compliance with TR-NWT-000057 “Functional
Criteria for Digital Loop Carrier Systems,” 13.4.3 Alarm Classification.
Major Alarm
Major Alarms are generated based on a loss of 24 or more customer service loops as a group; 24
individual losses are not classified as a Major Alarm.
Major Alarms occurring within the PG-Flex system are propagated up to the COT line unit. The
Fault LED illuminates at the respective line unit nodes and also at the COT FAU/FPI indicating a
Major Alarm condition. Upon detection of a major alarm condition, PG-Flex operates the major
alarm audible and visual relays, as well as, the shelf ID relay.
Minor Alarm
Minor Alarms are generated based on a loss of 2 to 23 customer service lines or to indicate non-
service affecting failures.
Minor Alarms occurring within the PG-Flex system are propagated up to the COT line unit. The
Fault LED illuminates at the respective line unit nodes and also at the COT FAU/FPI indicating a
minor alarm condition. Upon detection of a minor alarm condition, PG-Flex operates the minor
alarm audible and visual relays, as well as the shelf ID relay.
Information Alarm
Information Alarms are non-service affecting events. They are generally tied to the HDSL
Performance Monitoring function or when a change in PG-Flex physical configuration has been
detected. Some alarms can be elevated to Minor Alarms at the discretion of the customer.
Information Alarms cause the FAULT LED to be illuminated at the line unit at which the fault
occurs but do not trigger the customer’s alarm relay interface unless it has been promoted to a Minor
Alarm by the customer.