Instruction manual

3-3. OPERATING INSTRUCTIONS
Preliminary Settings Release all the push-buttons.
Turn-on The DV-MUX3 does not have a power switch, therefore it immediately starts op-
erating when power is applied. To apply power, connect the DV-MUX3 power ca-
ble to its rear POWER connector, then plug the other end into a grounded mains
outlet.
When power is connected, the DV-MUX3 performs self-test. During self-test, all
the indicators light for approximately 0.5 second, then change to the normal states.
The PWR indicator remains lit as long as power is available.
Normal Operating
Indications
During normal operation, all the front-panel indicators, except PWR, and possibly
TD and RD (see following section), are off.
NOTE
Upon turn-on, the SYNC LOSS alarm indicator may light up,
indicatingthat the other communication equipment servingthe
DV-MUX3 link is not yet operating. The indicator must turn
off as soon as all the link equipment is operated.
In case the SYNC LOSS indicator lights and/or the TEST indicator flashes, refer
to Chapter 4 for troubleshooting instructions.
The TEST indicator will light steadily when a test is activated.
Monitoring Channel
Activity
To monitor traffic activity on a desired channel or on the main link, set the SE-
LECT switch to the corresponding position.
The TD and RD/ERR indicators show the traffic activity on selected channel (their
brightness is proportional to the traffic load). If the TD and RD/ERR indicators are
off while the selected channel transmits or receives data, refer to Chapter 4 for
troubleshooting instructions.
NOTE
The PATT and RLB push-buttons can be disabled by an inter-
nal switch. When disabled, the TEST indicator remains off
when a push-button is pressed.
Loop Activation When it is necessary to activate a test loop, set the SELECT switch to the position
corresponding to the desired channel, and then press the RLB push-button. The
TEST indicator turns on, and the TD and RD indicators show data activity on the
transmit and receive pairs of the selected channel.
The loop remains activated as long as the RLB push-button remains depressed.
Note that the activation of a main link loop interrupts the service to all the users
served by the DV-MUX3 link, whereas a channel loop interrupts only the user traf-
fic on the selected channel.
CHAPTER 3 - OPERATING INSTRUCTIONS
3-4 DV-MUX3 Installation and Operation Manual