Instruction manual

When the loop is no longer required, release the depressed push-button by pressing
it again. The TEST indicator turns off.
Refer to Chapter 4 for a description of the test loops.
BERT Activation To activate the BERT test, set the SELECT switch to the DATA position, and then
press the PATT push-button. The TEST indicator turns on, the TD indicator must
light, and the RD/ERR indicator lights if errors are detected (ideally, the RD/ERR
indicator should remain off during the test).
NOTES
1. The BERT test can be activated only on the data channel.
Pressing the PATT push-button when the SELECT switch is
set to LINK has no effect.
2. In order to obtain meaningful results from the BERT test,
the local DV-MUX3 must receive, on the tested channel, a test
pattern similar to the transmitted pattern. This can be achieved
either by connecting a remote loop on the same channel, or by
simultaneously activating the BERT test at the remote DV-
MUX3 (provided the link is operating properly). Otherwise,
the DV-MUX3 will not receive the test sequence and will indi-
cate errors.
The BERT test continues as long as the PATT push-button remains depressed.
Note that the activation of the BERT test interrupts the service to the users of the
selected channel.
When the test can be stopped, release the depressed push-button by pressing it
again. The TEST indicator turns off.
Refer to Chapter 4 for a description of the BERT test.
Tone Injection To activate tone injection, set the SELECT switch to the VOICE position, and then
press the PATT push-button. The TEST indicator turns on.
The remote side should hear a 1000-Hz tone at the nominal channel level (0 dBm).
The RD/ERR and TD indicators continue operating as usual.
NOTES
1. The echo canceler used on the voice channels cannot perform
itsfunctionwhenthesametoneis simultaneouslytransmittedand
received. Therefore, do not try to activate tone injection together
with a remote loopback, nor activate simultaneously tone injec-
tion at bosh the local and the remote DV-MUX3.
2. Tone injection is simultaneously activated on both voice
channels, therefore it interrupts the service to the users of the
two channels.
Tone injection continues as long as the PATT push-button remains depressed.
Note that tone injection interrupts the service to the users of the voice channels.
OPERATING INSTRUCTIONS
DV-MUX3 Installation and Operation Manual 3-5