Abstract: A space switch is disclosed which comprises an array (10) of cells (11, 13) which are interconnected with one another. The cells have a transmission gate (11) and a latch (13) for allowing a signal to pass from an input into the cell to an output from the cell. A column selector (12) and a row selector (14) are provided for selecting an appropriate one of the cells (11, 13) so that any one input to the array of cells can be coupled to any output of the cells.

Abstract: A subscriber inventory network provides efficient dissemination and rapid exchange of information between members. Members of the subscriber network are arranged in separate groups, with the member subscribers in each separate group being pre-qualified with respect to certain exclusive inventory categories. The receiving unit of each subscriber is selectively enabled to receive only those messages which are related to the designated inventory category, with all other messages being excluded. A message controller in each subscriber unit decodes command, address and message data bits. Two bits are dedicated for command instructions, including a distribution bit, which directs message data to a single unit in a single group, and a flash bit, which directs the encoded message data to all units in a single member group, or alternatively, to all receiving units in all member groups.