Comtech EF Data STS11/STS11L - Manual (Page 20)

STS11/STS11L Solid-State Transfer Switch Revision 0
Operation MN-STS11-11
3-2
Figure 3-2. STS11L Functional Block Diagram
3.2 Operating Procedures
The Solid-State Transfer Switch is designed to require minimal operator
intervention and control during normal operation. After initial setup, the unit
should operate in a relatively ‘transparent’ manner, providing trouble-free backup
of the online modulators
3.3 Solid-State Transfer Switch Backup Operation
Each modulator monitors the fault status of the other modulators through the
switch. An additional connector has been added to the standard DM240 to
provide a wiring port to the external IF switch. Each modulator is capable of
powering the IF switch through a current limited, diode or’ed power signal.
Either of the DM240s is also capable of commanding the switch to the prime or
backup state, as well as monitoring in which state it is. In normal operation, the
M&C in the backup modulator monitors the prime for faults. If one is detected,
it will automatically cause the IF switch to place the backup on-line. The switch
DM240
(Prime)
DM240
(Backup)