Abstract: A double redundant processor including first and second master processors for processing data, control and address signals in a data processing system. The first master processor is in an active state for processing the signals and the second master processor is in a standby state for processing the signals. The first and second master processors include first and second subprocessors for simultaneously processing the data, control and address signals, a comparator connected to compare the signals from the first and second subprocessors, thereby generating a comparison error signal if a disagreement exists, and an alarm monitor responsive to the error signal for inactivating the active master processor and activating the standby master processor.

Abstract: An integrated telephone transmission and switching system operating in a multiframe format where each frame consists of a plurality of time slots and includes a base switch connected to a plurality of multitime slots data buses where the base switch operates to switch encoded data between any specified time slots on any of the buses. A subscriber switch is connected between a plurality of subscriber lines and to a pair of multitime-slot data buses and operates to connect and concentrate the local subscriber lines to the specified time slots on the pair of data buses, thereby enabling connections between a local subscriber line and any other subscriber line connected to the system.

Abstract: A subscriber switch controller for use in a telephone system operating in time frames consisting of a plurality of time slots where the system includes a base switch connected to a plurality of multitime-slot buses for switching data between any of the time slots and includes a subscriber switch connected to a plurality of local subscriber lines and to a pair of the buses for connecting encoded data between the subscriber lines and specified time slots on the buses.

Abstract: A subscriber termnal for use in a TDM telephone system operating in a multiframe format where each time frame consists of a plurality of time slots, said system including a base switch connected to a plurality of multitime slot data buses for switching encoded data between specified ones of the time slots. A subscriber switch is connected to a plurality of local subscriber lines and to a pair of the data buses for switching encoded data between the subscriber lines and specified time slots on the pair of data buses. The subscriber switch includes a number of subscriber terminals where each terminal is connected to some of the subscriber lines and includes a pair of subscriber switch controllers for controlling the switching of data between the subscriber lines and the pair of buses.

Abstract: Communication processor apparatus for use in a TDM telephone system operating in a multiframe format consisting of a plurality of time frames where each time frame consists of a plurality of time slots having a time slot rate and where the plurality of frames includes signaling frames having supervisory signals where the supervisory signals occur as a signaling bit during each time slot in the signaling frame. The telephone system includes a base switch connected to a plurality of multitime slot data buses for switching encoded data between specified time slots on the buses and also includes a subscriber switch for connecting a plurality of local subscriber lines to time slots on a pair of the buses.

Abstract: An integrated message accounting system for use in a telephone system operating in time frames each consisting of a plurality of time slots. The system includes line groups each having a number of primary and secondary input and output portions for receiving input data signals and transmitting output data signals where one or the other of the primary and secondary portions is activated for receiving and transmitting the input and output signals. The system also includes a second number of time slot interchangers for connecting the active input portions to the active output portions where one of the interchangers is activated for connecting the input portions to the output portions. The system also includes a system controller for activating the primary or secondary portions and one of the interchangers.

Abstract: A redundant data transmission and storage system in which a plurality of transmission circuits are connected in series to form a channel network. Each transmission circuit includes at least two redundant data channels which are each capable of independent operation. For each transmission circuit, the selection of which channel, if any, is enabled in the active state is made by a channel control unit associated with that particular transmission circuit.

Abstract: Disclosed is a redundant data transmission and storage system employed within a telephone message metering system. Information concerning local subscriber usage is transmitted over one of two redundant data paths where each data path is capable of independent operation. The selection of which data path, if any, is enabled in the active state is made by control networks, one associated with each data path. Under alarm conditions, the data path initiating the alarm causes its associated control network to be in the inactive state. The other control network, absent an alarm in its own data path, senses the inactive state of the other data path and enables its own data path in the active state. The control networks are responsive to alarms having different priorities. Some alarms cause a transfer of the active state while, under particular conditions, others do not.

Abstract: A local message metering system for metering each subscriber's use of a telephone system. Scanner banks periodically address the subscriber circuits to store data about subscriber usage in scanner bank adapters. One or more remote tributary offices are connected to a recording office over data links which connect to the scanner bank adapters. Single channel and redundant, two-channel data links are employed. Redundant channels are controlled by interlocked control networks. The data links are controlled by data transmitters and data receivers. The data receivers are addressed along with the scanner bank adapters to transfer data over data paths to external storage units. Redundant data paths are controlled by interlocked control networks. The redundant data links operate independently of the redundant data paths.