S&C SpeedNet SDR Instruction Sheet Download Page 4

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

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