ACU-5000 Operations Manual
9-12 Interoperability Now
9.1.10 Expanded System Operation
Operation of an expanded system is no different than single-unit operation; there are simply more
available channels and more potential nets.
Below is the Channel Configuration Overview page. Note that:
• For the Primary System, the handset is Channel 0 and the external interoperability
channels are numbered one through twelve. Only channels one, two, or three can be set
to the PSTN channel type.
• For the expansion system, the numbering picks up where this left off, with the handset
as Channel 13 and the external interoperability channels are numbered 14 through 25.
Only channels 14, 15, or 16 can be set to the PSTN channel type.
If so desired, handsets may be used with both the Primary and Expansion Systems. If only one
local handset is operational the Expansion System handset is set to “Disabled.”
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