12.3 Cellular (TX/RX) LED Indicator
When the data logger is powered, the cellular LED will turn on according to cellular modem
communications states:
l
Off: Cellular modem off, insufficient power, or failure to establish a connection with the
provider (periodic retries will occur).
l
Solid: Cellular modem is powering up and attempting to establish a connection with a
provider.
l
Quick Flashing (approximately 1 second duration): Indicates successful network
registration.
l
Flashing: Flashes with network activity.
12.4 Signal strength and quality
Both signal strength and quality contribute to successful cellular data communications. The
factors that influence signal strength and quality include but are not limited to:
l
proximity to the cellular tower
l
tower load
l
competing signals
l
physical barriers (mountains, buildings, vegetation)
l
weather
Because signal strength and quality can vary due to many factors, they may not give a true
indication of communications performance or range. However, they can be useful for activities
such as:
l
determining the optimal direction to aim a Yagi antenna
l
determining the effects of antenna height and location
l
trying alternate Yagi antenna (reflective) paths
l
seeing the effect of vegetation and weather over time
12.4.1 Signal strength
Signal strength is how strong the received signal is. The closer your CR300-CELL is to the cellular
tower, the more signal the antenna will pick up. Signal strengths are lower the farther away from
the tower the CR300-CELL is.
For 3G networks, signal strength is reported as RSSl (Received Signal Strength Indicator). For 4G,
it is RSRP (Reference Signal Received Power).
12. Cellular communications option50
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