Tests and Diagnostics
GARD 8000 SYS RFL Electronics
February 14, 2011 11-25 973.334.3100
Major Alarm:
For the framer, a major alarm is loss of sync (RLOS). This alarm is also applied for loss of
carrier and unframed all ones; both conditions result in a loss of sync. Green indicates that the
Major Alarm is not active; red indicates that the Major Alarm is active.
Minor Alarm:
Become active when a loss of frame is detected but no loss of synch. The difference between a
minor and a major alarm is the loss of synch. Green indicates that the Minor Alarm is not
active; red indicates that the Minor Alarm is active.
Remote Alarm:
Indicates that the remote terminal is in an alarm state.
Service Enabled:
Indicates that the interface is enabled, passing information to the remote terminal. Green
indicates that the interface is enabled, red indicates that the interface is not enabled.
PLL Lock:
Indicates a valid Phase Lock Loop, received data and received clock are locked together and
not drifting with respect to each other, Green. Failure to properly lock could result in bit errors
and communication failure.
Transmit Activity:
Indicates the presence of outgoing data on the communications bus, Green. If no data is being
received the indicator will be Red.
Receive Activity:
Indicates the presence of incoming data on the communications bus, Green. If no data is being
received the indicator will be Red.
Octet Timing:
Indicates if Octet timing is enabled, Green, or disabled, Red.
Loop-Back Mode Tests:
Each loop-back mode has an Enable / Disable button associated with it. By clicking on the button the
user can enable different types of loop-back tests. When a test is disabled the assigned button is green,
when a test is enabled the button will be red. The test will not start until the execute button is selected.
There is a “Loop-Back Status” indicator that will turn red and display “ACTIVE” if any of the loop-
back tests are currently being run or will be green and “DISABLED” if all loop-back modes are
disabled. The Digital Interface will also issue a minor alarm while in loop-back and the Digital
Interface button on the inventory pages will be yellow.
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