Discretionary access control equipment for dispatching systems

Discretionary access control (DAC) equipment (DAC-E – encoding, DAC-D – decoding) is designedfor discretionary access and protection of mobile object positional data from unauthorized use in dispatching systems.

Mobile object positional data are protected by means of their encoding before being transferred to user terminal (UT) controller output with further decoding upon their receipt by dispatching center (DC) communication server.

The structural scheme of DAC equipment installation in a dispatching system is given below.

DAC-E installed in TU of a mobile object receives and encodes digital positional (or other confidential) data generated by TU.

DAC-D operates analogously to DAC-C, but decodes positional data.

In order to restrict traffic control station access to the protected mobile object data access code and version number are applied. Each traffic control station has a specific access code to receive the data from specific TU.