User Manual

Rear Panel Descriptions

Digital Connectors

(1) AES/EBU Out – All eight channels of the 4-710d’s A/D converters are output in AES/EBU digital

format on this standard DB-25 connector. The 4-710d AES/EBU output supports “Single Wire” mode at

all available 4-710d sample rates. The AES/EBU output does not support “Dual Wire” mode at sample

rates above 96 kHz.

( The DB-25 connector pin-out assignments are detailed in Maintenance on page 34)

(2) Word Clock In – The 4-710d’s internal clock can be synchronized (slaved) to an external master

clock. This is accomplished by setting Sample Rate knob ( page 12) to “W/C,” connecting the

external word clock’s BNC connector to the Word Clock “In” port, and setting the external device to

transmit word clock.

The frequency of the incoming word clock must be within ±3% of any of the supported sample rates. If

not, the LOCK indicator will glow red, the word clock OUT will be driven at 48 kHz, and the digital

outputs will be driven at 48 kHz and muted.

External clocking is required when connecting the 4-710d to another digital device, such as a com-

puter audio interface, whose digital clock is set to internal (making that device the “master” clock). All

digital devices in a system should be “slaved” to the master clock, otherwise clicks and/or pops could

be encountered when recording or monitoring the digital audio stream from the 4-710d.

( For more details, please see the “Digital Clocking Primer” section on page 23)

 Digidesign’s 192 I/O supports AES/EBU at sample rates above 96 kHz only in Dual Wire

mode. Therefore the 4-710d is incompatible with the 192 I/O when connected via AES/EBU

at sample rates of 176.4 kHz and higher.

 The 4-710d can be synchronized to an external “1x” clock signal only. Superclock,

overclocking, and subclocking are not supported.