AEQ Audio Over IP
Routing System
15
1.4.6. Latency.
In Dante, variation in latency in the network is compensated for at the receiver. Each receiver
has a device latency setting. This setting defines the latency between the timestamps on the
incoming audio samples and when those samples are played out.
The typical default latency for a Dante device is 1 msec. This is sufficient for a very large
network, consisting of a Gigabit network core (with up to 10 hops between edge switches) and
100 Mbps links to Dante devices. Smaller, Gigabit-only networks can use lower values of
latency (down to 150 µsec for very fast devices, such as PCIe cards). Recommended latency
settings are displayed in "Dante Controller", and may also be found in the documentation
accompanying the product.
Latency is set on the receiver. However, when a subscription is made, there is an automatic
negotiation process between the receiver and the transmitter, to ensure that the latency for the
subscription is high enough to prevent packet loss.
For example, Ultimo devices support a minimum of 1ms latency. If a faster device (such as a
PCIe card) is set to 0.25ms latency and is then subscribed to an Ultimo transmitter, the latency
used for the subscription will be 1ms, which is the minimum supported latency for the
subscription. Subscriptions to other devices (such as a Brooklyn II device using AEQ devices
with two AoIP ports) will be set at 1ms (or whatever latency the receiver is set to). This
effectively makes the device latency setting a 'default' latency, which is used unless the
transmitter doesn't support it.
NOTE: The minimum latency available for a device connected to a 100 Mbps network port is 1
msec. Using a latency lower than 1 msec over a 100 Mbps link will result in a subscription error,
with the tooltip 'Tx Scheduler Failure'.
Latency and Dante Virtual Soundcard.
"Dante Virtual Soundcard" allows a standard Apple Mac or Windows PC to function as a Dante
device. Because "Dante Virtual Soundcard" runs on a general purpose computer without special
hardware to support Dante timing requirements, additional latency needs to be added to
connections received from a "Dante Virtual Soundcard" transmitter.
"Dante Virtual Soundcard" is configured with custom latency values for reliable operation. Dante
devices with Rx channels that are subscribed to Tx channels from a "Dante Virtual Soundcard"
transmitter will automatically configure themselves to use these higher latency values for those
channels only. The latency on all other subscriptions on the receiver is unaffected.
1.4.7. Device Lock.
Device Lock allows you to lock and unlock supported Dante devices using a 4-digit PIN
(Personal Identification Number).
When a device is locked, audio will continue to flow according to its existing subscriptions, and it
can be monitored, but it cannot be controlled or configured – its subscriptions and configuration
settings become read-only.
To configure a locked device you must first unlock it using the PIN with which it was locked.
Locked devices can be identified by:
• A small grey padlock icon against the device name in the Network View > Routing tab
• A red background highlight when the device is moused over in the Network View >
Routing tab.
• A check (tick) in the Device Lock column in the Network View > Device Info tab.
• A red padlock icon in the Device View toolbar
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