Syncing An Avb Network - MOTU 8M User Manual

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 37-38, 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 18).
2 In the device list (item #1 on page 18), 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 4-13: Choosing a clock master.
H A R D W A R E I N S T A L L A T I O N
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 or ADAT
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.
49