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   IPTV Testing Loopback

Loopback testing is the process of testing the transmission capability and functioning of equipment within a system in which a signal is transmitted through a loop that returns the signal to the source. The test verifies the capability of the source to transmit and receive signals. Failure of one or more of these tests can be used to isolate and help diagnose problems within the system.

Loopback testing can be used to verify the operation or performance of the system. To verify the performance of the network, the error rate, packet loss rate, and other network parameters can be tested in loopback mode. During error testing, error correction processes (such as FEC) may be disabled so that the automatic error correction processes do not interfere with the counting of errors in the test signals.

This figure shows how loopback testing can be used in an IP television system to progressively test, confirm, and identify failed equipments in portions of a network such as the core network, the access network, and the end user viewer device. To verify the core network, the test signal is sent to the ONU at the access network connection point where it is returned (looped) back to the headend. If the core network is verified, the test signal can be sent to the modem at the access connection point portion of the network where it is looped back to the headend. If the access network is operating correctly, the test signal can be sent to the viewing device where it is looped back to the headend. This verifies that all the links in the network are operating correctly.

IPTV Loopback Testing Diagram

   IPTV Testing Books

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IPTV Testing This book covers quantitative (packet loss, error rate) and qualitative (perceptual) quality measurement and control processes used in IPTV systems. Quality measurement processes such as MDI, V-Factor, synchronization, interaction (control), and other measurable values are explained. Network probes, STB test client software, and multilayer testing are described. $19.99 Printed, $16.99 eBook

 

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