Townshend Computer Tools DAT-Link - Testing the Digital Audio Connections

2.7 Testing the DAT-Link 43
4. During the test, the red light on the top of the transmitter should ash.
After a few seconds the output of the computer should lo ok something like this:
Aim DAT-Link remote transmitter at DAT-Link sensor.***..*
Loopback Passed
If this test fails, make sure that the remote transmitter is prop erly connected and
aimed at the DAT-Link . If the failure p ersists contact your DAT-Link supplier.
2.7.3 Testing the Digital Audio Connections
The three pairs of digital audio input/outputs can be tested using the naloop
program. This program generates a test signal on the outputs and then veries
that the incoming signal matches the test signal. This program uses the NetAudio
server allowing it to b e used from any host on a lo cal area network. Unlike dltest
and rctrain , the NetAudio server must be running b efore using this program.
For example, to test the SPDIF digital connections, follow these steps:
1. Connect a cable between the SPDIF inputs and outputs. The cable required
has phono-type connectors on both ends.
2. If it is not already running, start the NetAudio server with the command:
netaudiod &
3. Run the test program:
naloop -i SPDIF
This will run the lo opback test at each of the three possible sampling rates: 32,000,
44,100, and 48,000 samples/second for 10 seconds each. During the test, the Lock
light on the frontofthe DAT-Link should come on indicating that it is receiving
a valid input. If everything is connected correctly, the following output will be
displayed:
Loopback test using RCA input
Looptest (LR) at 44100 samples/sec for 10 seconds
Passed
Looptest (LR) at 32000 samples/sec for 10 seconds
Passed
Looptest (LR) at 48000 samples/sec for 10 seconds
Passed
Total of 0 error condition(s)