TSPS No. 1: Peripheral Circuits

Some of the TSPS peripheral circuits are new or have novel features worthy of description while others are very similar to their No. 1 ESS counterparts and need no further description. Thus scanners, signal distributors, the AMA frame, and TTY buffers which have been described previously1 will not be treated in detail here. The communication bus, networks, trunk and service circuits, local and remote position subsystems, and novel features of various maintenance programs are the essential subjects of this article. The communication bus joining all units to the Stored Program Control (SPC) is described in Section II. A network consisting of trunk link network (TLN) and position link network (PLN) frames is used to establish connections between the trunk circuits and the operator positions. The network fabric is new and described later in Section III, although the implementation and control circuitry is similar to that used in the No. 1 ESS network. In addition to operator positions and trunks, numerous service circuits such as MF receivers and outpulsers also appear on the network. These circuits and their associated maintenance programs are described in Section IV. Displays for all TSPS equipment and test facilities for all trunks appearing on the network are provided in the Control Display and Test (CDT) frame as described in Section V. 2561