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User's Guide Fireface UCX © RME

14.2 Clock Modes - Synchronization

In the digital world, all devices must be either Master (clock source) or Slave (clock receiver).

Whenever several devices are linked within a system, there must always be a single master

clock.

A digital system can only have one master! If the Fireface’s clock mode is set to 'Master', all

other devices must be set to ‘Slave’.

The Fireface UCX utilizes a very user-friendly, intelligent clock control, called AutoSync. In

AutoSync mode, the system constantly scans the digital input for a valid signal. If any valid sig-

nal is found, the Fireface switches from the internal quartz (Clock Mode – Current Internal) to a

clock extracted from the input signal (Clock Mode – Current ADAT, SPDIF or Word). The differ-

ence to a usual slave mode is that whenever the clock reference fails, the system will automati-

cally use its internal clock and operate in clock mode Master.

AutoSync guarantees that record and record-while-play will always work correctly. In certain

cases however, e.g. when the inputs and outputs of a DAT machine are connected directly to

the Fireface UCX, AutoSync may cause feedback in the digital carrier, so synchronization

breaks down. To solve this problem switch the Fireface clock mode to Master (Clock Source –

Internal).

The Fireface's ADAT optical and SPDIF inputs operate simultaneously. Because there is no

input selector however, the unit has to be told which one of the signals is the sync reference (a

digital device can only be clocked from a single source). By selecting a clock source a preferred

input is defined. As long as the unit sees a valid signal there, this input will be used as the sync

source.

In some situations changing the clock mode can not

be avoided. Example: An ADAT recorder is

connected to the ADAT input (ADAT immediately

becomes the AutoSync source) and a CD player is

connected to the SPDIF input. Try recording a few

samples from the CD and you will be disappointed -

few CD players can be synchronized. The samples

will inevitably be corrupted, because the signal from

the CD player is read with the clock from the ADAT.

In this case the Clock Source should be temporarily

set to SPDIF.

RME’s exclusive SyncCheck technology (first implemented in the Hammerfall) enables an easy

to use check and display of the current clock status. SyncCheck indicates whether there is a

valid signal (Lock, No Lock) for each input (Word Clock, ADAT, SPDIF), or if there is a valid and

synchronous signal (Sync). In the field Clock Mode the clock reference is shown. See chapter

37.1.

In practice, SyncCheck provides the user with an easy way of checking whether all digital de-

vices connected to the system are properly configured. With SyncCheck, finally anyone can

master this common source of error, previously one of the most complex issues in the digital

studio world.

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