Instruction manual

CHAPTER 4.
DIAGNOSTICS
Contents Page
General ................................ 4-1
Description of Diagnostic Functions .................. 4-2
Troubleshooting Instructions ..................... 4-5
4-1. GENERAL
Three types of diagnostic functions are available:
•
Remote loopback.
•
BERT testing (available only on the data channel).
•
Tone injection (available only on the voice channels).
The BERT, tone injection, and remote loop are initiated from the front panel PATT
and RLB push-buttons, respectively, on the channel selected by means of the SE-
LECT switch.The operating procedures are explained in para. 3-3.For a functional
description of the test functions available on each channel, refer to para. 4-2.
The activation of the tests can be disabled by an internal switch, located on the DV-
MUX3 main board (figure 2-2). If troubleshooting is required and the DV-MUX3
does not respond to the PATT and RLB push-buttons,first check the position of the
switch.
When performing tests, observe the following guidelines and restrictions:
•
Activation of a channel test or loop interrupts the service to the users served
by the DV-MUX3 channel under test.
•
Activation of the main link loop interrupts the service to all the users served
by the DV-MUX3 link.
•
On any channel, only one DV-MUX3 can activate a remote loopback. If the
remote loopback has already been activated by the other DV-MUX3, the
TEST indicator starts flashing (indication of configuration error).
DV-MUX3 Installation and Operation Manual 4-1