Specifications

86
The Status of the Digital I/Os When Using the External Clock
The right-hand side of the clock menu page in
the SETUP area displays the status of the digital
inputs.
DIN 1/2 reflects the status of the digital inputs 1/2 (either the AES/EBU 1/2 input jack or
the S/P DIF 1/2 input jack depending on IN 1/2 on the [inputs] menu page).
DIN 3/4 (and DIN 5-8 on the H8000) reflect the status of the remaining XLR
AES/EBU inputs. If you intend to use these inputs, you must ensure that these inputs are
synchronized to the external clock source, as shown by the OK indication on the right
hand side. ADAT reflects the status of the ADAT inputs - you must ensure that the ADAT
inputs are synchronized to the external clock source if they are being used. Typically,
when using ADAT, your clock source will be either the ADAT signal itself, or a
WORDCLOCK to which the ADAT is also synchronized.
The H8000FW also shows the status of AES11-18 and FIREWIRE 1-2 – the same
synchronization requirements apply.
The status of the digital inputs will be:
slipping DIN 1/2 will read slipping if its sampling frequency changes suddenly or if
it is unstable. This means that signals are present, but they are not synchronized with the
external clock input. The greater the discrepancy between the external clock and the
input, the greater will be the distortion. Slight slipping can be acceptable in non-critical
applications, as the occasional clicks it produces are often masked by the source material.
Better, however, to enable sample rate conversion where available and be rid of it.
OK the input is synchronized to the external clock source and everything is cool.
unlocked no signals are present, the signals’ sampling rate is changing suddenly, the
signals’ sampling rate is very unstable, or something is dreadfully wrong with the signals.
The sampling rate at the digital outputs will be the same as the sampling rate of the
external clock (which is the system sampling rate in external ). A/D and D/A conversion
will be done at this rate.