Guralp Systems CD1.1 - Manual (Page 50)

CD1.1 Tools for Platinum
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The top left quadrant, 'S', displays the signature status: It
is green if the subframe is signed and red if unsigned.
•
The bottom left quadrant, 'G', shows the GPS lock status:
It is green if locked and red if unlocked.
•
The bottom right quadrant, 'T', represents the timing
status: It is green if the clock differential is acceptable
and red if it has exceeded the configured threshold.
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The top right quadrant, 'M', depicts “miscellaneous”
status: it is green if everything is satisfactory but turns
red if any channel, security or misc. status bit is set.
The quadrant indicator also serves as a link to the subframe
decoder, where the entire contents of the subframe are
displayed broken into fields, along with the interpretation of the
contents. The top of such a display is shown below:
50 Issue C