Rear Panel
15
(3)
Word Clock Out –
This BNC connector transmits a standard (1x) word clock. For all settings except
W/C, the 4-710d is the clock master and the clock rate sent by this port is specified by the Sample
Rate knob
(
#17 page 12)
. The 4-710d will drive the Word Clock to all devices on the chain.
When the Sample Rate is set to W/C (external word clock), the 4-710d is a word clock slave. If the
incoming external word clock is within ±3% of a supported sample rate (44.1 kHz, 48 kHz, 88.2 kHz,
96 kHz, 176.4 kHz, 192 kHz), Word Clock Out will mirror Word Clock In with a slight phase delay (about
40ns). If the incoming external word clock is not within ±3% of a supported sample rate, Word Clock
Out will default to 48kHz, and the digital outputs will be muted.
Word Clock Out does not truly mirror Word Clock In, so Word Clock Out should not be used to daisy
chain the Word Clock if the 4-710d is in the middle of the Word Clock chain. The correct method to
connect the 4-710d in the middle of a Word Clock chain is to use a T-connector at the 4-710d Word
Clock input, and leave the 4-710d Word Clock Out unconnected.
(
For more details, please see the “Digital Clocking Primer” section on page 23
)
(4)
75
Ω
Termination –
This pushbutton switch provides internal word clock termination when
required. Termination is active when the switch is engaged (depressed).
Word clock termination should only be used at the receiving end of a word clock cable, or, if the cable
is daisy-chained across several units, termination should only be used on the last unit in the chain.
For example, if the 4-710d is the last “slave” unit at the end of a clock chain (when the
4-710d’s word clock “Out” port is not used), termination should be active. If the word clock is passed
through the 4-710d to another unit (when the 4-710d’s Word Clock Out port is connected, passing the
word clock through to another device), termination should be disabled.
(5)
ADAT Optical Outputs 1 & 2 –
Up to eight channels of the 4-710d’s A/D converters are output in
ADAT optical format using these two connectors. The particular 4-710d channels that are output at
each port depend upon the current sample rate setting. At sample rates of 44.1kHz and 48kHz, all
eight channels are output on both ADAT ports (mirrored). At higher sample rates, industry standard
S/MUX™ multiplexing is used to maintain high-resolution transfers. At rates of 88.2kHz and 96kHz,
channels 1-4 are output on ADAT port 1, while channels 5-8 are output on port 2. At 176.4kHz and
192kHz, channels 1 and 2 are output on port 1, while channels 3 and 4 are output on port 2 (channels
5-8 cannot be output via ADAT optical at the highest rates). These correlating values are shown in the
following table:
Analog Connectors
(6)
AC Power Input –
Connect a standard, detachable IEC power cable (supplied) here.
(7)
Line Inputs 5 through 8 –
These four line inputs feed directly into channels 5–8 of the 4-710d’s
A/D converters. Any ¼” phone plug (balanced TRS or unbalanced TS) carrying a line-level signal can
be connected here for output via the AES/EBU or ADAT digital outputs. These inputs are fed into the
limiter when the limiter
(
#16 on page 12)
is enabled.
Sample Rate
Knob Setting:
ADAT Port 1
Output channels:
ADAT Port 2
Output channels:
44.1, 48
1-8
1-8 (mirrored)
88.2, 96
1-4
5-8
176.4, 192
1-2
3-4
