User guide

5-4 DL3800 DS1 Inverse Multiplexer User Guide—February 1999
5
Access Levels And Protected Mode
Front panel access can be limited by placing the DL3800 in the Protected
Mode. In this mode, the user can use the Front Panel User Interface only to
monitor the status of the unit and its Error Counters, and view its
conÞguration. The following operations cannot be performed through the
Front Panel User Interface when the unit is in Protect Mode:
¥ Clearing the Error Counters.
¥ Changing the unit conÞguration.
¥ Starting or terminating diagnostic tests.
The unit can be put into and out of the Protected Mode through the
Terminal User Interface, but not from the Front Panel User Interface. To
place the unit in protect mode, toggle the Front Panel Þeld to Off, in the
Unit ConÞguration menu. Refer to ÒUnit ConÞgurationÓ on page 4-13.
When a user needs to take a unit out of Protected Mode but a terminal is
not available, the following procedure can be used:
1. Turn off the power to the unit.
2. Turn the power to the unit back on.
This procedure takes the unit out of the Protected Mode (and clears any
password that may have been programmed into the unit). To allow the
user to perform this procedure when the unit is in protected mode, the
Yellow Network is in Loopback.
Flashing Yellow Receiving yellow/AIS alarm.
Unit LEDs:
Status
Maj
Min
Display the status of the DL3800E, and whether the condition is a
Major or Minor alarm.
When a port’s Active/Restore mode is set to Never Use and its
alarm mode is set to Mask, then the activity LED will be turned off.
NOTE: The unit automatically performs a self test every time the unit is
powered up.
Table 5-1 Front Panel LEDs (Continued)
Indication Description