Junger Audio b46 - Digital Audio Leveler - Manual (Page 21)

4. LOCATION OF PARTS AND CONTROLS
The 4-channel processors of b40 series fitted with SDI-interface
are compatibel with the standard SMPTE 272M-AB. They
support 48 kHz synchronous audio sampling with 20 bit word
length.
4.4
CONFIGURATION
OF SDI INTERFACE
The standard allows up to four groups each of four mono audio channels.
(Usually used by most of D-VTR's and other equipment is Group 1 with 48
kHz synchronous sampling.)
Group selection and other settings are to configure with settings
by front panel operation (mode section).
Operation manual b46, chapter 4 -location of parts and controls - page 4-5