How To Use The NPR XDS Satellite Receiver With AES67 without PTP

How To Use The NPR XDS Satellite Receiver With AES67 without PTP

The new NPR receivers will output AES67 from LAN Port 3. We have developed a method that
can be used to read these streams at either 44.1Khz or 48Khz sample rates without having to use
a PTP-1588 Master Clock for your system.

Instead of using a 1588 Master Clock you can take an AES-3 output from the DB-9 on the receiver
and use that as a clock source for the Blade network. You’ll need to have either a digital Blade
(ip88-3d), a combo analog / digital Blade (ip88-3ad), or a Console Mix Engine Blade (ip88-3cb)
with input #8 open for this purpose.

On the receiver side, set the ip address of LAN Port 3 to an address on the Wheatstone subnet
that doesn’t conflict with existing devices. Go into the receiver GUI and uncheck the Livewire box.
This puts the receiver in AES67 mode. Set the overall sample rate to match the sample rate you
are currently using. (44.1K or 48K).

Then go to the settings for each port. There you can choose the port, the packet size, and the
sample rate for each of the 4 outputs. That screen should look like this:

Note that all 4 ports must be configured before the GUI will let you save that configuration.

You will be assigning multicast addresses to each stream. We recommend that you start at
239.192.1.xxx to avoid conflicts with addresses that Wheatstone uses.

Under Mode select L24/Low Latency

Clicking on the link for each port will display the SDP file for each output stream:

The important info on this screen is the multicast ip address (239.192.1.1), the port used (5004),
The stream type (L24, Linear 24 bit PCM)), the sample rate (44.1K), and the number of channels
(2, or stereo).

Now add an AES67 device to the Wheatstone system using the base IP address of the receiver (
LAN port #1, the one you use to connect to the outside world), and give it a name. Also select a
Blade in your system to act as the host Blade for the receiver:

Go to AES67 Devices in the System Dock and Select the ATX, then click on Add Source:

Edit the Stream Info for that source. Use the Multicast IP address you set on the ATX GUI.
Set the port to 5004. (Note: You may also choose port#50100 if your version of software
doesn’t support port 5004. This port will also need to match what is set on the receiver
side.) Set the packet time to .25ms.

Take the AES-3 output from the ATX and connect it digital input 8 on a digital, analog/digital, or
console blade. Then go to the Info tab in Navigator and select that blade as the masterclock
source.

For each stream from the receiver you will now have a source using the name you gave it that can
be routed to any destination on your Wheatnet-ip network.