Traffic Service Position System No. 1: Remote Trunk Arrangement: Hardware and Software Implementation

Early in the RTA planning process, it was recognized that controlling trunks, networks, and test circuits remotely was a task similar to controlling operator positions, voice path circuits, and test circuits remotely; i.e., the RTA job would be similar, in several aspects, to the work planned for development of a new position subsystem. These configurations are shown in Fig. 1. These job similarities led to development of a set of data-handling circuits known as the Peripheral Control Link (PCL) used to link the remote hardware to the controlling processor at a T S P S base location. A Remote Trunk Arrangement (RTA) consists of a PCL, various 2-wire and 4-wire trunks at the remote site, a concentrator network to temporarily connect these remote trunks to a base-remote trunk, a maintenance buffer, and a trunk test frame. A Position Subsystem (PSS) No. 2 consists of a PCL, several operator positions, some supervisory and chief operator circuits, a voice path control frame, a maintenance buffer, and a test frame. The PSS No. 2 is only briefly treated in this paper and is mentioned at this time to indicate another consideration in PCL design--a desire 1167