ULXD Dual and Quad Receiver - Latency

FAQ #4140 Updated January 24, 2017

Question:

Please elaborate about the inherent latency of the ULXD Dual and Quad receiver, and how it relates to Dante and to the AVB standard.

Answer:

The design goal of the AVB working groups was a maximum latency 2ms; this assumed less than 7 switch hops.  The working groups were able to achieve that goal, mostly, but found some unusual cases were the 2 ms goal was not met.  Note: The 2ms latency goal is only network latency, not product latency.  A genuine AVnu-branded AVB product will have configurable latency to accommodate the network's capability.

Dante has configurable latency and should be adjusted to the speed and complexity of the network.  Dante latency is not in Shure's latency specs because it is configurable in Dante Controller software. Dante latency is associated with Dante receivers, and does not apply to the ULX Dual/Quad since they are Dante transmitters. 

The 2.9ms specified for ULXD is product latency and does not contribute to the network latency.  The ULXD Dual/Quad Dante outputs technically have lower latency than the ULXD analog out because there is no D/A conversion.  The delay was deemed insignificant (0.17ms).

To summarize:
ULXD latency, mic capsule to analog out:  2.9ms
ULXD latency, mic capsule to Dante out:  2.73ms   (2.9 - 0.17 = 2.73ms)

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