MOTU UltraLite Betriebsanweisung PDF herunterladen (Seite 41)

HARDWARE INSTALLATION

SYNCING AN AVB NETWORK

The AVB protocol provides sophisticated and

accurate timing, synchronization, and clocking

features for AVB device networks of any size as

shown on pages 33-34, including:

■ Low latency

■ Network-wide time base

■ Better-than-sample-accurate phase lock across

all connected devices

■ Timing accuracy down to the nanosecond

Choosing a master clock

The web app provides an easy way to choose one

device as the master clock for your whole MOTU

AVB network.

1 Go to the Devices tab (page 12).

2 In the device list (item #1 on page 12), choose

the MOTU interface you wish to use as the clock

master.

3 Click the Become Clock Master button below the

Clock Mode menu.

Now, all other MOTU AVB devices on the network

are resolved to this device.

Figure 4-9: Choosing a clock master.

Alternately, you can go to the clock mode menu for

each individual device separately and choose the

master clock device by hand. For example, you may

be in a situation where at least one MOTU device

on the network must remain resolved to its own

clock (or another clock source). Just know that in

this case, audio cannot be streamed between

MOTU AVB devices that don’t share the same

master clock.

Resolving the master clock device to an

external clock source

The MOTU device you’ve speciﬁed as the AVB

network clock master can itself be resolved to an

external time base such as word clock (if available)

or optical. Just choose the desired clock source

from its Clock Mode menu (in the Device tab).

Doing so effectively resolves the entire AVB

network to the external clock source.

SYNCING MULTIPLE AVB AUDIO

INTERFACES CONNECTED TO A MAC

There are several options for clocking multiple

AVB audio devices connected to the Mac:

■ You can resolve them to an external clock source

(like word clock, if available).

■ You can create an aggregate device, as usual. The

aggregate device setup panel has a check box called

Drift Correction, which sample-rate converts

devices that are not synchronized.

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