The office alarms interface is a set of discrete relays controlling audible and visible office alarms. CR (critical) and MJ (major) alarm conditions are reported through one pair of relays. MN (minor) alarm conditions are reported through another pair of relays.
These alarm relays are controlled by the SYSCTL and are functional in a shelf that is equipped with a SYSCTL.
The steady state current for office alarm connections must not exceed 1.0 Amp at 60 Volts or 1.8 Amps at 30 Volts. The maximum transient currents (20 msec duration) during initial contact closure must not exceed 9 Amps at 60 Volts or 18 Amps at 30 Volts.
Alcatel-Lucent 1850 TSS-5 provides provisionable incoming signal alarm delay and alarm clear delay. The alarm clear delay only applies to equipment alarms. It does not apply to signal failures. The office alarms are not activated unless an incoming signal condition of greater duration than the alarm delay occurs. When a failure clears, a provisionable alarm clear delay prevents premature clearing of the alarm.
When multiple alarm conditions occur, the highest-level office alarm (audible and visible) is activated. When the highest-level alarm condition clears, the office alarm bumps down to the next highest level alarm condition.
If enabled, the Remote NE Status feature includes alarms at other NEs in the same alarm group as the local NE to determine when to activate the local office alarm and the appropriate alarm level.
The audible office alarms are silenced through activation of the alarm cut-off (ACO) function. Visible alarms are not extinguished by the ACO function.
If the ACO function has been activated to silence the active audible alarm and a bump down occurs, the audible alarm remains silent (that is, the lower level visible alarm is activated, but the corresponding audible alarm is not reactivated). If another alarming condition occurs while the ACO is active, the audible alarm is activated even if the new condition is a lower level. For example, if a major (MJ) alarm was active and silenced using the ACO function and a minor (MN) alarming condition occurs, the audible alarm will sound.
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