![S&C SpeedNet SDR Instruction Sheet Download Page 4](http://html1.mh-extra.com/html/sandc/speednet-sdr/speednet-sdr_instruction-sheet_3078094004.webp)
4
S&C Instruction Sheet 1075-500
Description
As shown in Figure 1 on page 3, the front panel of the radio has the following LED
indicators:
The
LINK
LED shows radio power and link state. A red
LINK
LED indicates that the
radio has power but is not linked. A green
LINK
LED indicates that the radio has power
and is linked. Radios configured to Point-to-Multipoint Master Radio always show a
green
LINK
LED. All other radio configurations show a red
LINK
LED upon power up
until the radio link is established. When the link is established, the
LINK
LED becomes
green. If the link is dropped, then the
LINK
LED returns to red.
The
XMIT
LED flashes red every time the radio transmits data.
The
RCV
LED flashes green when the radio is receiving and decoding an RF packet.
Because of the high speed of the embedded microprocessor and communications, all
status LEDs can turn on and off very quickly. In some cases, the LEDs turn on and off so
quickly that the LEDs appear to be on but dimly lit. This behavior indicates that events
are happening in very quick succession. A good example is the
XMIT
LED changing
intensity from dim red to bright red to off. This indicates many small packets in quick
succession (dim red), followed by many large packets with almost continuous transmis-
sions (bright red), then no transmissions (off).
Indicator
Color
Description
LINK
Red
Power on, no Radio Frequency (RF) Link
LINK
Green
Active RF Link
XMIT
Red
Active RF Transmit
RCV
Green
Active RF Receive
Upon power up, the green LED on Serial Port 1 is illuminated and remains on. This
is the Power Indictor LED for the product and also means the CPU is running properly.
During the boot process, the serial port yellow LEDs indicate the Linux Kernel is loaded
and running. Once the Linux Kernel has booted, the solid yellow LEDs are turned off.
Yellow LEDs on Serial ports now indicate the mode of operation of the port. Serial ports
configured as data ports for Serial Services will have a yellow LED that remains off. Serial
ports configured as console ports for logging into the radio will have a yellow LED that
blinks every 3 seconds.
Table 2. SpeedNet SDR Radio LED Indicators