198611 – de Visser – MetRail Integrated Services Digital Network (ISDN)

The high operating costs, the unreliability and the lack of expansion capacity of the MetRail communication network has resulted in the replacement of the following telephone exchanges:
a. The Ericsson OS1029, a 5O year old hybrid rotary and step by step exchange located in the old Head Office at 67 Spencer Street, which provided 1500 extensions;
b. The Ericsson ARD571, an 11 year old cross bar exchange located at the Electrical Control Centre in Batman Avenue, providing 270 extensions;
c. A modified Ericsson OS1029, an 18 year old hybrid step by step crossbar exchange located at the Spotswood Stores Depot, providing 500 extensions.

As well as these, a number of smaller PABXs and intercom exchanges were also replaced.