Adtec digital EN-91 / EN-91P (version 1.02.29) Manual - Manual (Page 45)

How to Configure Passthru Audio
Adtec EN-Series encoders have the flexibility to meet many demanding audio requirements.
Each model contains specific encoding options, but every Adtec EN-Series encoder supports
four audio passthrus. An audio passthru consists of a compressed bitstream ( Dolby E 20
Bit / Dolby E 16 Bit / Dolby Digital / Linear Acoustic Stream Stacker 2 ) or an uncompressed
stereo pair ( LPCM ) from an embedded SDI or AES input passed into the egress transport
stream ( IP, RF, ASI ).
The encoder supports passthru on the first four SDI/AES audio inputs. The SDI Matrix and
ASI Tranport Stream PID configurations allow for custom configurations if required.
Every audio input engine has an internal SDI Matrix to route any audio to one or multiple
inputs. Each audio engine output can be assigned a user configurable PID in the transport
stream to meet any job requirement.
If the passthru audio is coming in on discrete AES inputs, the ‘PID’ tab may be used to
manipulate egress PID’s as required.