ATL Telecom OM100 - Manual (Page 16)

3.7 FRONT PANEL
3.7.1 Controls
The front panel controls have a dual purpose. For normal operation, the LED indicators display
status information as described in section 3.7.2 and the push buttons are used for applying
test loops as described in section 3.7.1.4. These controls can however, also be used to
configure the modems without the need to plug in a VT100 terminal or PC. To do this, the
front panel controls must be enabled for "Full Control" (default setting) and the unit set to
Programming Mode.
3.7.1.1 Disabling the Front Panel Controls
The modems are delivered with the front panel controls fully enabled as the default
configuration. This means that both test loop activation and modem programming are
possible from the front panel. They can however be disabled to prevent unauthorised persons
from using them to interfere with the settings of the modem. The VT100 management
system (which can be password protected) is used to enable or disable the front panel controls
via the Configuration > Front Panel menu (see section 7.2.10). The options available are "Full
Control" (default), "Loops Only" and "Input Disabled".
3.7.1.2 Programming Mode
To enter the programming mode, press the Local Loop and Loop Back buttons together and
then release them. Upon releasing the buttons, the Status indicator starts to flash. This
indicates that the unit is in programming mode and will continue to flash for approximately 30
seconds after the last programming action. Programming is carried out using the Local Loop
and Loop Back buttons, with the LED indicators showing the parameter numbers and their
values. The Remote Loop button is used to store the new parameter value. If the values aren't
stored within the 30 second timeout period, the modem will exit programming mode (Status
Indicator stops flashing) and the new parameter values will be discarded.
Refer to Appendix B for a full explanation on entering parameters using the front panel
3.7.1.3 Resetting to Factory Default Configuration
Press the Local Loop and Loop Back buttons together, and then with the buttons still pressed,
press the Remote Loop button as well. The unit will automatically restart with all of its
configuration data cleared.
Note: When the units reboots it will be configured as a "Slave".
ATL USER GUIDE
OM100 Optical Multiplexer
29 28 ATL USER GUIDE
OM100 Optical Multiplexer
3.6.2.1 Troubleshooting - User Ports
Problem
Incoming signal is not present.
(LOS means Loss Of Signal).
Incoming signal is too small.
Alarm Indication Signal detected.
(AIS is transmitted by equipment
that have a major fault).
Small number of bit errors.
On user port.
High number of bit errors.
On user port.
Alarm
LOS detected
AIS detected
BER > 10E-6
BER > 10E-3
Cause
Cables are broken
Cables wired incorrectly
Major fault within terminal equipment
Terminal equipment not powered on
Cables are faulty
Cable of insufficient quality
Cable too long
Too many connections
Terminal equipment fault
Electrically active environment
Earth grounding problem
Cables are faulty
Cables of insufficient quality
Cables are too long
LOS indicates that no
signal is present
AIS indicates that the Terminal
equipment has a serious fault
Counters start once a signal has been
detected - initially, they remain frozen.
OM100 Mon 01 Nov 2002 00:54:49
Performance > User Port
Urgent Alarm:Off Non-Urgent Alarm:On
Subsystem: LT
Port: 1
LOS Detected [ ] BER > 1E-3 [ ]
AIS Detected [ ] BER > 1E-6 [ ]
Line Code Violations 0 Trip Counter 0
Available Seconds 100 Trip Counter 100
Unavailable Seconds 0 Trip Counter 0
Severely Errored Seconds 0 Trip Counter 0
Errored Seconds 0 Trip Counter 0
Error Free Seconds 100 Trip Counter 100
Press Escape to Exit
F1 Help F3 Previous Menu F4 Main Menu F5 Previous Channel
F6 Next Channel F7 Previous Subsystem F8 Next Subsystem F9 Reset Trips
F10 Reset System Counters
3