E F Johnson Company 2425M80 Benutzerhandbuch

Draft 02 - Sep 1 2015

4-16

OTAP is an “Over the Air” programming feature for the subscriber parameter (code plug) 
files. Using the OTAP feature, parameter files can be updated and changed in the field, 
eliminating the need to take the radio out of service to perform the updates. Firmware 
updates cannot be made using this feature. Firmware version 8.10.x or later is required to 
use conventional OTAP or P25 Trunking OTAP.

The current profile in the radio controls how an OTAP download is handled. How this is 
programmed determines the possible actions the radio should take: “Activate 
Immediately” or “Update on Reboot”.

Update on Reboot

• The Standard Control Head displays “OTAP UPDAT RECEIVED. RBOOT RDIO” 

after a successful OTAP download, prompting the user to reboot the radio to apply the 
update.

• The Lightning Control Head displays the message “OTAP Update Received. Reboot 

radio to update.” after a successful OTAP download, prompting the user to reboot the 
radio to apply the update.

Larger files tie up the radio for a long time. Therefore, any user interface event, such as a 
channel change, zone change, button press or toggle switch position change (portable 
radios only) stops the OTAP procedure and returns the radio to normal operating mode. 
For button presses/toggle switch position changes, the radio exits OTAP mode only if a 
function is programmed for the button/toggle switch; otherwise, the bad tone sounds.

Low signal conditions may also cause the radio to exit OTAP. If the radio does not receive 
a response from programming one minute after receiving its last data packet, the radio 
stops the OTAP procedure and returns to normal operating mode.