Specifications

SDM-650B Satellite Modem Operation
Rev. 5 4–3
4.1.1 LED Indicators
General modem status and summary fault information are indicated by eight LEDs on the
front panel. The indicators are defined as follows:
Faults Color Description
Transmit Red LED Indicates that a modulator fault condition exists.
Receive Red LED Indicates that a demodulator/decoder fault condition exists.
Common Red LED Indicates that a common equipment fault condition exists.
Stored Red LED Indicates that a fault has been logged and stored. The fault
may or may not be active.
Power On Green LED Indicates that power is applied to the modem.
Transmitter On Green LED Indicates that the transmitter is currently ON. This indicator
reflects the actual condition of the transmitter as opposed to
the programmed condition.
Carrier Detect Green LED Indicates that the decoder is locked.
Test Mode Yellow LED Flashes when the modem is in a test configuration.
4.1.2 Controls
The modem is locally operated by using the following six keys:
Key Function
[ENTER] [ENTER] is used to select a display function, or to execute a change to the
modem’s configuration.
[CLEAR] [CLEAR] is used to back out of a selection, or to cancel a configuration change
which has not been executed. Pressing [CLEAR] generally returns the display to
the previous selection.
[←] and [→] These keys are used to move to the next selection or to move the cursor for
certain functions.
[↑] and [↓] These keys are used primarily to change configuration data (numbers). The
keys are also used at times to move from one section to another.