RTS SIP-ISDN, Hardware & Software Manual, Page: 42 / 102

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AES/EBU Interface
• If you select the option digital for the output, the configuration for the AES/EBU
Interface is displayed. Under Clock Source of digital output the following set-
tings are available:
– Internal : The AES/EBU output clock is adapted to the internal system clock.
– External : The AES/EBU output clock is adapted to the external clock which is
supplied by the Audio 2/CLK IN interface. The clock frequency of the supplied
clock needs to be 48-kHz.
– Recovered : The AES/EBU output clock is recovered from the digital input sig-
nal of the Audio 1/AES IN interface. This configuration should be selected if you
use the digital input of the system. In this way, a synchronous working of the
transmission chain is ensured.
Main Nominal Level
• If you select the analogue mode for input or output, the corresponding slide controller
is displayed to set the nominal Audio level of the XLR Audio interfaces ( Main No-
minal Level ). The main nominal level can be adjusted separately for the input ( Le-
vel In ) and for the output ( Level Out ) within a range of -3 ... +9 dBu in steps of 1-
dB. The head room is 6 dB . If you want to have the maximum level of 15 dBu for the
system, you need to set 9 dBu as main nominal level. The default setting is 0 dBu.
5.5.2.2.3 Relay/TTL
The RTS SIP-ISDN System provides six GPIO Pins (TTL) which can be individually
programmed as input or output. Additionally, two Relays are available.
The functionality of a TTL Pin - Input or Output can be selected using the drop down
list for Direction .
The following description is valid for all six configuration windows TTL1 (Pin 9) ,
TTL2 (Pin 10) , TTL3 (Pin 11) , TTL 4 (Pin 12), TTL 5 (Pin 13) and TTL 6 (Pin
14) .
NOTE An AES/EBU input always works with recovered clock. Therefore, only a configu-
ration of the output is required.
For clock synchronisation with other systems, you can use the clock output
Audio 2/
CLK OUT . The clock frequency of the output clock is 48-kHz.