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How to Set the LOS Threshold on the EDFA
COMMAND INPut:LOS:LIMit
DESCRIPTION Set the Loss Of Signal (LOS) threshold of the device. If input signal
power drops below the specified threshold it will have the following
effects:
• Bit 2 (LOS) of the device status register will be set.
• If ALS is enabled laser output will be deactivated.
NOTE:
1> User should query the range of the LOS before setting the
threshold. The LOS limit setting is the trigger of the ALS system. If
threshold is set to a value that is outside the range, invalid setting error
will be generated.
2> If the input photo detector is not present, LOS limit cannot be set.
INPUT FORMAT :INPut:LOS:LIMit <C>,<S>,<D>,<Threshold>
INPUT RANGE <Threshold>*
Float Variable (dBm)
*Resolution is 0.1 dBm
OUTPUT FORMAT None
OUTPUT RANGE N/A
DEFAULT Device 1 = -23
Device 2 = -120
EXAMPLE The following example sets the LOS limit of the OA device on chassis
2, slot 8, device 1 to –25dBm.
Terminal Input: :INP:LOS:LIM 2,8,1,-23
ERRORS
Error Number Error Description
-224
Illegal parameter value (out of range).
-500
Invalid address or no card inserted.
-540
Invalid setting (device does not have an
input photo monitor circuit present)
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