Chapter 2. 9500 MXC Terminals
Vol. II-2-6 Alcatel-Lucent
cable details refer to Appendix C.
Alarm Inputs
The active state of each TTL alarm input is configurable to be active if the
voltage on the input is high, or active if the voltage is low. The alarm software
detects a change in the state of each input circuit, and raises or clears an input
accordingly. The nominal alarm polling rate is 1 second. Fleeting changes are
ignored.
• Input state changes are captured in the event log as an alarm.
• TTL input thresholds are specified at 2V min high, and 0.8V min low. High
voltage (spike) protection to 48V is included.
Alarm Outputs
The output relays may be configured to be energized or de-energized on receipt
of an alarm event. A user can also select on the Alarm I/O connector a normally
closed, or normally open contact pair.
The relay contacts are specified at:
Maximum Voltage 250 Volts
Maximum Current 2 Amps (applies up to 30 Volts)
Maximum Power 60 Watts
Note: These are maximum values, which require de-rating if the relay is to be
used for frequent-switch applications.
The contact voltage must be restricted to less than 60 Volts for
compliance with SELV regulations.
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