Multi-task state machine signalling translator

Abstract From the Canadian patent

Real-time conversion between two different A/B signal coding schemes based on the DS1 time division multiplex format is achieved by time sharing a programmable state machine. The time sharing is accomplished synchronously with the DS1 superframe such that each of the 24 DS1 channels have signalling translated once every superframe. Programmability of the state machine is facilitated by the use of an EPROM. A RAM is used for real-time storage of signal states, machine states and processor provisioning for each channel, thereby facilitating time sharing of the state machines. Flexibility is provided through the unique use of an EPROM, which can be modified to directly change the …