DOC 6511_Release K
ATS-6511A/B/C Users Guide
15
[auto_rearm] true
[master] A
[min_valid_time] 1
[mode] auto
[OK] 2013-08-13T17:26:23Z
The mode indicates the ATS-6511 is using the auto switching feature. If there is a loss
of signal on Fiber A (master) the Input A indicator will turn RED to indicate there is an issue with
that source and the system will automatically switch over to Input B and the Input B indicator will
turn ON. The status input:switch command will indicate an auto switch occurred as well as
which fiber is currently selected (i.e. Auto Switched: B (now in B after an autoswitch). Once the
signals to Input A are restored the INPUT A indicator will flash Green (on for 1 second/off for
three seconds). When the master source (in this case Input A) remains valid for the
[min_valid_time] (seconds-in this case 60) and the [auto_rearm] is true, the ATS-6511 will
automatically switch back to the master source, in this case Input A becomes the active channel.
Note: If the [auto_rearm] is false, the system will remain on Input B until the operator
commands the system to return to Input A. Once Input A is restored the Input A indicator will
flash Green (on for 1 second/off for three seconds) and the system will remain in this mode until
the operator commands the system to switch back to A. (fiber_switching auto A 60)
Caution: The system will not switch back to the primary source unless the manual option is used
or until the [min_valid_time] has expired if you are using the auto mode with the norearm option
off.
If there is a loss of signal on Input B (the alternate source) the INPUT B indicator will turn RED
to indicate which fiber pair has been lost. Once the signals are restored the INPUT B indicator
will flash Green indicating the source is available.
When both fiber inputs are not available, the unit will enter holdover mode. In the ATS-6511A,
the internal OCXO is the holdover reference. The ATS-6511B-R provides an internal Rubidium
reference for holdover, or can use the 10 MHz provided to the rear panel as the holdover
reference. The ATS-6511B provides the user the ability to use an external input for holdover in
addition to the internal OCXO.
2.5.2 Manual Switching
When the auto switching feature is disabled the operator must select the desired input (A or B) as
the primary (master) source, in the example below Fiber A is the master. System settings can be
checked using the settings fiber:switching command.
ATS-6511>fiber_switching manual A
[OK] 2013-08-13T17:30:02Z
ATS-6511>settings fiber:switching
[auto_rearm] true
[master] A
[min_valid_time] 30
[mode] manual
[OK] 2013-08-13T17:32:52Z
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