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All subsystems have some form of backup mode. Within the constraints of equipment capability, each subsystem addresses the unique requirements of the user and the environment in which the user operates. On board your ship, you may not use all these systems, but during your career you will probably come across all of them. Now that we have identified the satellite communications subsystems, we need to provide you Submarine Satellite Information Exchange Subsystem (SSIXS). This subsystem compliments other communications links between SSBN and SSN submarines and shore terminals.

This current source is usually a solidstate dc power supply that provides variable current to the teletypewriters. The extra current source normally provides current from the positive side for marks and current from the negative side for spaces. There are some advantages to using polar circuits rather than neutral circuits. In a polar circuit, it is almost impossible to distort a signal by high reactance, low-line currents, or random patching of circuits or equipment. —Mark and space signals in the teletypewritercharacter R.

The system can notify the user of the transmit operating mode selected, both visually and with audio indications. There are two versions of SAS: an automated system (ASAS) and a manual system (MSAS). The voice switching equipment and means provided for user control over circuit selection are the two primary differences. Information in this section applies to both ASAS and MSAS, unless otherwise specified. The system can notify the user by visual indication if the voice station equipment is not connected to a crypto or plain subsystem.

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