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Chapter 4 - Introduction to Matrix Intercom Systems 47
Figure 4.2
Example of Matrix Ports
History of Matrix Intercoms
Properly, it can be said that matrix intercom systems go back to the advent of automated
central office telephone switching systems in 1892. Matrix intercoms, even today, owe a
great deal to the concepts and technologies of those systems.
In the 1950’s, McCurdy Radio Industries of Canada introduced the 7000 Series matrix
intercom based on wire per crosspoint and reed relay technology. Its basic building block
was a crosspoint card containing six crosspoints. It was the first known matrix intercom
system developed for the broadcast industry. In the early 1970’s, in a project for the CBC,
a solid state crosspoint was developed and the resulting matrix intercom system was
named, the 9100. This was still “wire per crosspoint” technology, but density increased to
allow a 10 X 1 format on a single crosspoint card. A 10 X 10 system could be built in only
7RU. The 9100 gradually kept expanding and graduated to the 9200 series. The largest
system built was a 60-port system delivered to CBC Winnipeg.
ADAM / ADAM-CS / ZEUS
MATRIX
Data
1 - 8
Data
9 -16
Data
17 - 24
1
2
3
4
12
3
4
Out 4
In 4
Data 1 - 8
Out 1
In 1
Data 1 - 8
PORT #4
PORT #1