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Chapter 3
Functional Details
External components
The RedLab WLS-IFC has the following external components, as shown in Figure 2.
Status LEDs (USB Activity, Transmit, Receive, Received Signal Strength indicators)
Power LED
USB connector
Figure 2. RedLab WLS-IFC component locations
Status LEDs
The LEDs indicate the communication status of USB and wireless operations. An LED bar graph indicates the
strength of the signal received by the remote device. Refer to the table below for the function of each LED.
LED functions
LED Function
Steady green – the RedLab WLS-IFC is connected to a computer or external
USB hub.
Power
Blinking green – indicates activity over the USB connection.
Received Signal Strength (RSS)
indicators
3 green LED bar graph. The LEDs will turn on when receiving a wireless
message and stay on for approximately 1 second after the end of the message.
They indicate the amount of fade margin present in an active wireless link. Fade
margin is defined as the difference between the incoming signal strength and the
device’s receiver sensitivity.
Three LEDs on : Very strong signal (> 30 dB fade margin)
Two LEDs on : Strong signal (> 20 dB fade margin)
One LED on : Moderate signal (> 10 dB fade margin)
No LEDs on: Weak signal (< 10 dB fade margin)
USB activity
Green LED – indicates activity over the USB connection.
Transmit
Yellow LED – indicates transmitting data over the wireless link.
Receive
Red LED – indicates receiving data over the wireless link.
Power
LED
Receive LED
USB Activity LED
Transmit LED
USB
connector
Received Signal
Strength (RSS)
LEDs
Summary of Contents for RedLab WLS-IFC
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