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The No. 1 electronic switching system has a much higher concentration of control than previous telephone systems.

Line and trunk translation data and operating programs for No. 1 ESS are stored in a large semipermanent memory. This memory is provided by modular units known as program stores.

T h e No.

The No.

The purpose of this paper is to give a detailed description of the architecture and circuit design of the No. 10A Remote Switching System (RSS) control complex.

A local Electronic Switching System (ESS) provides the call control for a 10A Remote Switching System (RSS).

The goal of this paper is to provide a general insight into the 10A RSS circuits and units making up the remote unit, with the exception of control which is covered in a separate article.

The physical design objectives of No.

The No. 10A RSS RT acts as an intelligent peripheral controller which follows call processing and maintenance orders sent over the data link from the host processor.

1.1 Maintenance objectives Overall system requirements and objectives for the 10A Remote Switching System (RSS) are detailed in Ref. 1.