VBrick Systems VB5000 - Manual (Page 90)

82 © 2009 VBrick Systems, Inc.
Diagnostics: Network Tests > Data Test
Data tests are used primarily to test the integrity of a network connection between two
VBricks. A loopback test takes all data received at the video IP port and retransmits the data
to the configured transmit IP destination. A loopback test may be used to observe the quality
of the video data after looping back at the destination. A loopback test is available only for
encoder-decoder models and is bi-directional. If appliance "A" is set in "loop back," it will
return any stream back to the originator.
Cell tests allow generation of a known data pattern and checking of the integrity of the data
pattern on reception. This test is often useful to verify a network service line before video
deployment. The transmit encoder generates the pattern and the receive decoder checks the
pattern. Statistics indicating good packets and identifying bad packets are provided in the
receive appliance. If you are using encoder-decoder models, the preferred method for
running cell tests is to initiate and terminate the test on one VBrick and to put the other
VBrick into loopback. The encoder can be configured to send a test pattern to any decoder
that receives and performs integrity checks. The network destination address in both the
encoder and decoder screens is used to direct all test packet data across the network. For this
test scenario, the test may be run in a timed mode or continuously. Statistics are updated on
the IWS page when you click the
Refresh
button.
Cell test is available for encoder-decoder, encoder only, and decoder only appliances. In this
mode the encoder VBrick transmits the data pattern and the decoder VBrick receives and