Motorola APX 7500 User Manual page 27

Supported Features
1. Channel – The dispatch console user uses the Select Frequency command to change the
Consolette's radio channel. This will select items such as a talk group and an air interface
type. The number of channels that can be changed by the dispatcher is dependent on the
Console. Gold Series Elite has the capability for up to 12 channels. The MCC7500 has the
capability for up to 255 channels through the new T255R255 base type.
The Consolette is capable of 1250 channels and these can be accessed from the O5
control head. When a Select Frequency command is received from the Console, the
Consolette will send a message to the mobile radio to steer it to the channel requested.
Note that the channel number from the Console is mapped linearly to a zone and channel
in the mobile radio. For example, if each zone has 5 channels, and the Console requests
channel 8, the Consolette will steer the mobile to channel 3 in zone 2. If the mobile does
not allow the indicated channel, the Consolette will generate a "bonk" tone and remain in
the current channel.
2. Coded/Clear – When a coded or clear (encryption on or off) command is received, the
Consolette will send a message to the mobile radio to set encryption to the indicated state.
If the mobile does not allow the indicated encryption state on the current channel, the
Consolette will generate a "bonk" tone and remain in the prior state.
3. Transmitting Voice – A console user makes a voice transmission on an ACIM Link
channel using the same procedures they use on an ASTRO conventional channel. First
they ensure that the desired mode is set through the Select Frequency feature. Then the
console user also ensures that the correct secure mode and CKR (if configured and coded
mode is desired) are chosen. 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: For encrypted voice calls, the Console sends the request for secure mode and the
associated CKR to the Consolette so the Consolette can encrypt the audio. The Console
does not encrypt the audio associated with coded mode calls.
Once all of the selections are made the console user invokes a PTT (through a mouse
click or footswitch) to start their transmission. 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 PTT Keepup is no longer detected by the Consolette or if the Console operator
dekeys, the Consolette will dekey.
NOTE: Outbound voice selective calls (ex. Private Calls) are not supported on the ACIM Link.
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.
* Option W969 for Multiple Key Encryption Operation is required for this operation.
NOTE: If the radio does not allow the indicated encryption state on the current channel, the
Consolette will generate a "bonk" tone and remain in the prior state.
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 Call Alert will
contain the Console's ID, not the Consolette's. The corresponding ACK is received by the
Consolette and provided to the Console.
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