Specifications

MICOM-2ES/2RS/2TS ALE Supplement to Owner’s Guide
Using the MultiNet Feature
Normally, a radio operating in the ALE mode receives and transmits only in its
currently selected net. However, there are operational scenarios in which it is
beneficial to enable radios to use the ALE functions while still being aware of what is
going on in additional nets (for example, firefighters and paramedics must often
respond to the same emergency), and be able of answering a call in another net. For
this purpose, MICOM 2 radios offer the MultiNet feature.
When the MultiNet feature is enabled, a MICOM 2 radio can operate on multiple
nets (up to 20). The operating characteristics then change as follows:
• Channels: each net has a group of assigned (receiving and associated
transmitting) frequencies. The radio scans the channels in one net after the
other, until all the nets have been scanned.
• Station addresses (the self-address and the net address used when responding to
calls): the radio responds according to the self-address assigned to the station in
its currently selected net (for a total of up to 20 self-addresses).
• Sounding: each radio sends soundings only within the currently selected net.
Each radio scans all the channels in the currently selected net, one by one.
Sounding is started 10 minutes after the unit is switched on. The sounding
group interval is determined according to the programmed Sounding Auto
Time.
During operation, the MICOM radio scans all the frequencies included in the defined
nets:
• When the radio receives a call, it responds with the self-address that is
programmed in the radio for that net.
• When initiating a call, you select the net you want to transmit to, and then select
an address (a specific station, or any other type of address you wish to use). The
radio then looks up the frequencies that are associated with the station you call
and uses only those frequencies to call that station.
• LQA exchanges and sounding use only frequencies associated with the
currently selected net.
Note that the time needed to scan multiple nets may be rather long, even when using
the rather fast 5 channels/second scan rate. Moreover, the duration of a call set up
request must also be long enough to ensure that your call reaches all the relevant
nets. You can use the MaxScanCh parameter (an ALE programming option) to
change the duration: the default, when AUTO is selected, is about 7 seconds;
however you can select a different value, in the range of 1 to 59 seconds. Make sure
to use the minimum value that ensures all the nets will hear your call set up request,
because long durations are very disruptive.
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