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PLM Series Operation Manual rev 1.1.3
10. Back Panel Interface
10.2.2 Digital inputs and links
AES/EBU
INPUT 1-2
LINK 1-2
Figure 10.2.2: Rear panel
AES digital connectors
The AES/EBU digital audio input is on an XLR3F connector, which is directly paralleled to the adjacent
XLR3M AES/EBU Link connector.
The AES/EBU digital audio format uses a balanced electrical configuration similar to balanced analog audio.
The pinout is shown in table 10-2.
AES/EBU Wiring Table
Pin 1
Ground/Shield
Pin 2
Hot (+)
Pin 3
Cold (-)
Table 10.2.2: AES connector wiring and pin out
Note that this is the only possible method of wiring – there is no equivalent of an “unbalanced” connection
in the digital domain.
The AES/EBU signal format carries 2 channels of audio (plus other control data) on a single cable/connector.
Selection of Ch 1 or Ch 2 is performed within the digital processing section of the PLM and is controlled
from the menu system. See section 9.12.3.1 for full details.
The AES/EBU Link connector may be used to “daisy-chain” the inputs of multiple PLMs together. Unlike
daisy-chaining of analog inputs, attention must be paid to line termination. When daisy-chaining PLMs
together, only the “last” PLM in the chain should be set to
Terminated
. All other PLMs should be set to
Unterminated
. See section 9.12.3.3 for full details of setting input termination.
As with balanced analog audio, there is a finite limit to how many PLMs may have their AES/EBU inputs
“daisy-chained” together. The practical limit will be determined by cable type and length as well as the
output circuit of the driving source. It may be necessary to employ an AES/EBU line driver or distribution
amplifier to achieve reliable results in some situations.
Please read the warnings regarding the connection
of digital audio signals in section 6.2.1 before
attempting to use the AES/EBU input.
