Acim Inbound Command Handling - Motorola APX 7500 Detailed Service Manual

Feature Operation: Wireline Interface
Once all of the selections are made the console user invokes a PTT (through a mouse click or
footswitch) to start their transmission. Note that the commands for Coded or Clear and CKR select
are not sent until the PTT is initiated by the console user. The requested transmission is then
performed by the Consolette routing audio from the wireline TX interface to the radio for transmit.
The transmission goes out on the currently selected air interface (and talk group if one is chosen)
using the unit ID of the Consolette's radio (not the Console's unit ID). Once the Console operator
dekeys, the Consolette will dekey. If the mobile configuration does not allow the PTT (RX Only
Channel for example) or if any of the Channel/Coded/Clear/CKR commands included in the PTT
sequence are disallowed, the Consolette will generate a "bonk" tone and not Key Up.
NOTE: Outbound voice selective calls (ex. Private Calls) are not supported on the ACIM Link.
4.12.3.1.4 Encryption Key (CKR) Select
The Console user has the ability to select a specific CKR value to be used during transmit operation.
When a CKR select command is received, the Consolette will send a message to the mobile radio to
cause it to use the requested CKR on future transmissions.
NOTE: If the selected CKR is not programmed in the radio, the Consolette will generate a "bonk" tone
and the prior CKR will remain selected.
NOTE: The Encryption Key (CKR) Select command is only sent when there is an associated
command to transmit from the Console. This is especially important for Analog Conventional
air interfaces (modes) where the Encryption Key must be properly selected in order to decrypt
inbound secure calls. For this reason it is recommended to use CKR strapping for Analog
modes. See the APX 7500 CPS for more details on programming the Consolette radio's
secure settings.
4.12.3.1.5 Outbound Call Alerts
Allows the Console user the ability to transmit a Call Alert to a subscriber on the selected channel.
The request is sent from the Console to the Consolette which will transmit the Call Alert over-the-air
to a subscriber. The source ID of the Call Alert is the Console's ID. The corresponding ACK is
received by the Consolette and provided to the Console.
NOTE: Operation on Conventional channels is supported at product launch. Operation on Trunking
channels is not supported.
NOTE: MCC7500 consoles support outbound Individual Call Alerts and not Group outbound Call
Alerts.
4.12.3.1.6 Monitor
When a monitor command is received, the Consolette will send a message to the mobile radio to
cause it to enter the monitor state (ex. disables Receive PL on Conventional channels). Following
any PTT On – PTT Off command sequence, a message is sent to the radio causing it to exit the
monitor state.

4.12.3.2 ACIM Inbound Command Handling

The Consolette will forward received call information reported from the radio transceiver to the
Console. This includes received call alerts, PTT-IDs as well as the CKR value used in conjunction
with the received signal.
4.12.3.2.1 Receiving a Voice Transmission including IDs
When the Consolette receives a voice transmission it is reported to the Console via the ACIM Link.
The console user will see it as an inbound call on the ACIM Link channel.
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September 9, 2011