9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. II-3-69
• For a DAC 155oM, the maximum overhead capacity is 512 kbps, but is only
available when the MSOH (Multiplexer Section Overhead) NMS option is
selected. If NMS data is assigned to the RSOH (Regenerator Section
Overhead), the total NMS overhead is 192 kbps, meaning just one auxiliary data
channel can be configured.
Alarm I/O Interfaces
The AUX plug-in provides up to 6 TTL alarm inputs and up to 4 Form C relay
outputs. The configuration options are:
• 2 TTL alarm inputs and 4 Form C relay outputs
• 4 TTL alarm inputs and 2 Form C relay outputs
• 6 TTL inputs only (default configuration)
Refer to:
• Alarm Inputs
• Alarm Outputs
• Alarm Application
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.
Both normally closed and normally open contacts are available on the I/O
connector.
State changes are captured in the event log as an informational event.
Relay contact specifications:
• Maximum Voltage 250 Volts
• Maximum Current 2 Amps
• Maximum Power 60 Watts
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