Digital Voice

• D-Star's digital voice specifications carry a 96-bit transmission containing 72 bits of voice and 24 bits of data for identification and synchronization purposes. The voice codec is advanced multiband excitation (AMBE), a proprietary protocol owned by the Japan Amateur Radio League.
  
  

Digital Data

• D-Star's digital data specification uses a bit stream as a complete Ethernet packet. Each transmission contains only one Ethernet packet with error detection done by Ethernet clients. Certain broadcast protocols, such as NETBIOS, can cause errors in D-Star data communication.
  
  

Control

• Each D-star transmission begins with synchronization and a radio frequency (RF) header, the RF header contains information for error correction. The header also contains identification information in the form of a seven character call sign made of upper case ASCII characters.