Alarm message

Overview

An Alarm message indicates that a feed in to Darwin has stopped, or has re-started.

The alarms sent are as follows:

Alarm	Meaning
tdAreaFail	Darwin has detected that no data has been received from a single TD for a period of time
tdFeedFail	Darwin has detected that no data has been received from any TD for a period of time
tyrellFeedFail	Darwin has detected that its connection to Tyrell has failed

Each alarm has a unique identifier, and may be cleared with an alarm being received with a 'clear' element and the same unique identifier.

<alarm>
  <al:set id="20669">
    <al:tdFeedFail />
  </al:set>
</alarm>

<alarm>
  <al:clear>
    20669
  </al:clear>
</alarm>

<alarm>
  <ns11:set id="379654">
    <ns11:tdAreaFail>E1</ns11:tdAreaFail>
  </ns11:set>
</alarm>

<alarm>
  <ns11:clear>379654</ns11:clear>
</alarm>

National Rail Enquiries Data Feeds
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