User's Manual

MCPS2135 System MonitoringPlanning and PreparationIntroduction

MCPS2135 System Operation 23

1.1.1.35.3.1.3 Critical Alarm

A major failure or a condition exists that could result in damage. The MCPS2135

is automatically taken out of service.

Immediate service attention is required.

1.1.25.3.2 Alarm Responses

The fault management system automatically responds when a fault is detected.

Responses vary in impact from alarm notification with no subsequent action (for

minor faults) to alarm notification and shut-down (for critical faults). The

hierarchy of responses is designed to keep the MCPS2135 in operation unless

continued operation would result in damage to the unit. Under some fault

conditions, the MCPS2135 continues to operate in a degraded state. The operator

may choose to continue to operate in a degraded state, shed channels, or shut down

the MCPS2135 until repairs can be completed.

1.1.1.15.3.2.1 Automatic Alarm resets

Critical Alarm

When a critical alarm occurs, the MCPS2135 will automatically be DISABLED

(i.e., taken out of service) until the operator re-ENABLES the unit.

Major Alarm

When a major fault is detected, the MCPS2135 attempts to clear the fault by

performing a reset. In most cases, the MCPS2135 will attempt to reset five times.

If the alarm condition fails to clear after five attempts, the MCPS2135 remains in

operation with the fault alarm set.

In the case of an over-temperature major alarm, the fault manager will attempt to

clear the alarm one time only by resetting. If the fault condition does not clear, the

alarm classification will escalate to critical (out-of-service), and the MCPS2135

will shut down and remain off-line until returned to service by the operator.

Alarm Transient Supression

To minimize false alarms from transient anomalies, the fault management system

is designed with built-in hysteresis and filtering. If the fault condition persists past

the filter interval, the appropriate fault alarm is set.

1.1.1.25.3.2.2 Manual Alarm resets

When a major Alarm is detected, the operator may choose from the following

options:

• Take no action and allow the MCPS2135 to operate in a degraded state until

service can be performed.

• Shed input channels to reduce the power to the MCPS2135.

• Disable the RF Module using the front panel switch, diagnostic port, or

optional base station alarm and control interface