Axia Analog Node Bedienungsanleitung PDF herunterladen (Seite 26)

3: Advanced Programming • 18

Version 2.0, February, 2007

set in 802.1p tag. The Ethernet switch, upon reception

of such frame, uses the port default VLAN ID. Only

802.1Q priority information is used.

“DSCP Class of Service” is a standard describing the

tagging of IP frames with service information. Network

equipment can be set up to provide different forward-

ing delay and drop precedence depending on the service

information. Our defaults are compatible with most Eth

ernet equipment defaults for class of service Livewire

requires; you should not need to change them unless in

structed by Axia Support.

AES Synchronization and Clock

These setting determine two factors. The Livewire

Clock Master Priority setting determines the clock mas

tership options as described above for the Analog Node.

The AES node also permits additional synchronization

options given that it can be locked to an AES source, as

discussed below.

AES Sync Source & AES Master Timebase

If the AES sync input as Livewire master timebase

box is checked, then this node will use the AES source

fed to the input to chosen in AES sync source as the

clocking source for this node if and when it becomes

the Livewire master clock source. If this node becomes

the Livewire clock master (see above), then the entire

Livewire network will be synchronized to the AES sig-

nal fed to the selected input.

Of course Livewire clock mastership can change (as

described above) so the careful user will feed house AES

sync to multiple 8x8 AES nodes. In this case, those nodes

would all be set to priority 4 or 5 (see above) to ensure

that these nodes will be the source for the Livewire mas

ter clock whenever one of this group is available.

If AES sync source is set to Livewire 48 kHz then the

system will simply use the unit’s internal clock source if

and when it becomes clock master.

AES Output Sync

This sets the output sample rate and synchronisation

for this node’s AES outputs. It as two options:

Livewire 48kHz.

This would cause the AES outputs be synced direct

ly to the Livewire system clock and no sample rate

conversion will be performed. However the receiv

ing unit would need to have sample rate conversion

or to be synchronous to the Livewire system clock or

dropouts due to buffer over/under run will occur.

AES Sync in

In this case, the Livewire stream will be sample rate

converted to the clock stripped of the designated

AES input. This permits operation at rates other than

48 kHz, but only if an external source at that rate is

used.

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