Telex 38109-977 manual History of Matrix Intercoms, Example of Matrix Ports

Figure 4.2 Example of Matrix Ports
			ADAM / ADAM-CS / ZEUS
				MATRIX
Data	Data	Data
1 - 8	9 -16	17 - 24
1
2
3
4
1	2	3	4
				Out 4
				In 4	PORT #4
				Data 1 - 8
			Out 1	PORT #1
			In 1
			Data 1 - 8

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.

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