About SMB Controller
2.2.3 Display and Control Panel
The display and control panel of the SMB Controller on the front panel consists of an LED display
panel and a pilot key. It is used to indicate operating states and carry out functions.
2.2.3.1 LED Display
The front panel contains an LED display field with a total of 9 labeled LEDs. It is used as an
operating state and error indicator during the start-up phase and during operation.
Figure 3: LED display
Each LED can take on one of four states: green (G), orange (O), red (R) and inactive. In general,
the colors have the following meaning:
Table 4: Significance of the LEDs colors
Color Meaning
Inactive Switched off
Green Normal operation / everything
in order
Document Version 1.0
13 System Manual for Mitel SMB Controller
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