General; Saving Configurations To Memory - Extron electronics System 8 User Manual

Two Switcher Operation
Daisy Chain Connections
Star Connections

GENERAL

For large installations that require more than eight or ten inputs, System 8/10 switchers can be looped together. Up to
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MULTIPLE SWITCHER OPERATION
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17 switchers can be looped together, providing a total of 154 inputs (using all System 10 switchers). System 8 and
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System IO switchers can be looped together in any combination. There are two connection schemes suitable for
looping switchers----Daisy Chain and Star configurations.
Daisy-chain refers to routing the output the of one switcher into the last input of a second switcher, and the output of
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the second switcher to input of the third... etc. The maximum number of inputs available in the daisy-chain
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configuration is 154 when using all System 10 switchers (120 when using all System 8 switchers). The daisy-chain
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configuration is easy to configure but results in decreased system bandwidth due to the cascading signal path through
multiple switchers. As a further limitation of this connection scheme, it does not facilitate the use of composite-to-
RGB converters or scan doublers.
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Star Configurtion: In a star connection scheme, the switchers are interconnected in a "Primary / peripheral"
configuration. The output of each "peripheral" switcher is individually routed to the inputs of a single "Primary"
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switcher. The output of the "Primary", in turn, is routed to the projector or display monitor. The maxi­mum number
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of inputs available in the star configuration is 100 when using all System IO switchers (80 when using all System 8
switchers). The star connection scheme is somewhat more complicated to configure but provides maximum video
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bandwidth since the video signal is only routed through two switchers. Another benefit of the star configuration is the
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SAVING CONFIGURATIONS TO MEMORY

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The System 8/10 has an internal memory to store the current connection scheme (configuration). To save the
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configuration to memory, switch No.4 of the ADDRESS DIP switch, located on the rear panel of the Primary Unit,
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must be set to the Configuration (open) position and the system operated for a minimum of 10 seconds. This provides
sufficient time to save the configuration in the EEPROM memory of the Primary Unit. After the configuration is
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saved, the ADDRESS switch No.4· is set to the Normal (closed) position. The configuration sequence does not have to
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be repeated until or unless the connection scheme changes. Instructions for saving connection schemes are included
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with each set of configuration instructions that follow.
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System 8/10 User's Manual • Page 5-1
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