Chapter 5 Diagnostics
MX-2100/2104
Installation and Operation Manual
5-6
Diagnostic Tests
Table 5-4. Activating / Deactivating a Channel Loop
Step Action
Key
Display
1
Bring the cursor under the top row
(if not already there).
CURSOR
2
Scroll to display TEST OPTIONS i:j
in the top row.
SCROLL
Second row displays the first type of channel loop
and its state: e.g., LOCAL LOOP: OFF
3
To change, bring the cursor under
the left-hand field in the second
row and scroll to display the
desired type of channel loop.
CURSOR,
SCROLL
The available selections are:
•
LOCAL LOOP
•
REMOTE LOOP – The remote loop is
connected on the local MX-2100 toward the
remote unit.
•
TONE_INJECT – displayed only for voice
channels
•
PRBS – displayed only for data channels. If
you intend to use this function to check for
transmission errors, you must also connect a
physical loopback, or activate an appropriate
loop (e.g., a local or remote main link loop, or
a remote channel loop
•
BERT – displayed only for data channels,
provided the downloading function is enabled
4
To change the state of the selected
loop, bring the cursor under the
right-hand field in the second row
and scroll to display the desired
state: ON or OFF.
CURSOR,
SCROLL
5
Press ENTER.
ENTER
If this is the only active test on this MX-2100, the
state of the front panel TEST indicator changes
Activating / Deactivating PRBS Transmission on a Data Channel
After the pseudo-random sequence (PRBS) transmission test is activated on the
selected data channel, as explained in the previous section, the next time you
select TEST OPTIONS for this channel, the second display row shows the current
test results:
•
PRBS [GOOD]: ON – PRBS transmission is being performed on this channel,
and no error has been detected on the data channel.
•
PRBS [BAD]: ON – PRBS transmission is being performed on this channel and
at least one error has been detected. This indication is normal if no loopback is
connected.
Activating / Deactivating BERT Test on a Data Channel
Same as PRBS test, except that when the BERT test is initiated, a remote channel
loop command is automatically sent to the remote MX-2100. In this case, a BERT
[BAD]:ON display always means that errors have been detected.