T700 User Guide.pdf - 1 PC Network Inc

Chapter 9 Diagnosis
Figure 9-6 Loopback Test
Warning Loopback test is mainly used for locating fault and is provided to the
commissioning personnel for testing and debugging. For ordinary users, please use it
cautiously.
In the drop-down menu, there are four kinds of loopback modes: audio hardware loopback,
local loopback, loopback remote terminal, and local RTP loopback. Select one mode, and
click the Start Loopback button to implement loopback. Click the Stop Loopback button
to stop the loopback operation.
Audio Hardware Loopback
Audio hardware loopback refers to output the acquired audio signals directly without coding
and decoding. After loopback, the TV set or sound box connected to the TV port of AUDIO
OUT can hear the sound of the local terminal after loopback.
This loopback is effective in both conference and non-conference status. This function is
used to judge if the sound input and the terminal’s acquisition function are normal.
Local Terminal Loopback
Local terminal loopback refers to the direct loopback of the local terminal's media signal,
including audio local terminal loopback and video local terminal loopback.
It is only effective in non-conference status. If the user implements such operation in
conference status, a prompt box pops up prompting that the loopback is only effective in
non-conference status. This loopback is used to judge if the terminal's audio and video
input and output, coding and decoding functions are normal, and to detect if the related
audio and video peripherals work normally. In normal situation, the terminal can display
its own image and broadcast its own sound.
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