The Amtszusatz module was connected to the outside lines via a 30 conductor socket (30 tlg. Buchsenstreifen). This socket was located on the rear of the module. The socket consist of 10 columns (1 – 10) with 3 rows (a -c) per column.
Although the cable has 30 conductors, only the sockets in columns 1 through 3, rows a, b, and c are wired into the Amtszusatz. Only rows a and b are used to connect with the three ZB (zentralbatterie betrieb) automatic exchange lines on the cable’s terminal strip.
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