OTAR (Over-The-Air-Rekeying) – is the common name for the method of changing the encryption keys in a two-way radio system over the radio channel or “over the air”. The Otar function is ONLY available for the NDB-750 series modules

To further Increase your efficiency the digital encryption modules are also available with Over-the-Air-Reprogramming (OTAR) which allows system controls and Key codes to be changed by remote commands, even while radios are in the field and operational. 

These modules are also compatible with Nabishi's user-friendly Controller software which enables dispatchers to easily log, monitor and manage the radio system using a special software on a personal computer, so you can better track and control your operation.  You can protect the integrity of your system if any radio is ever lost or stolen, disabling a radio using the kill/stun feature, which prevents the radio from transmitting or receiving any messages.

OTAR is a key management system for two-way radio systems with digital encryption modules installed with NB-750. The OTAR system operates as:

• 1. A personal computer PC with special software OBS sends a secure input to:

• 2. A controller CNB600 DOB which interfaces between the PC and the transmitter.

• 3. Then a base radio to transmit the secure signal

• 4. Over the air to a subscriber radio

• 5. To radios fitted with Digital encryption modules (NB-750-SOB)

Main Functions and Features of OTAR

• Over the air re-programming
  Re-keying of the encryption keys

• Radio Verification
  Discretely checks and verifies that the radio is switched on and is within the coverage
  area (in secret mode).

• Kill Function
  Disable the module if the radio is lost or stolen.

• Stealth or Secret Mode
  Discrete Monitoring / Listening In (secret mode of radio’s transmit)

• Restrict Function
  Temporary restriction of receive and/or transmit of the subscriber.

• SMS
  Sending of short alphanumeric messages to the radio – secret command
  from other subscribers – only for Motorola radios with LCD display

• Secure Operation
  The OTAR commands are encrypted with 32-bit Master Key (constant within a system)

• Secure Access to Modules
  A password for the module to be re-keyed HAS to be known in order to Re-key it.