Led Indicator Lights; Signal Strength - Campbell CELL200 Series Product Manual

The USB port is used to check the module status, configure the module, send a new operating
system, or watch low-level communications. This is done by opening a web browser and using
the following URL: cell.linktodevice.com.
TIP:
If your computer does not have access to a DNS server, browse to 192.168.86.1.

7.2 LED indicator lights

When your CELL200-series module is connected to power and an antenna, there is a specific
pattern to the lights to indicate its operation mode as described in
Table 7-1: LED Indicator Lights
Flashes every 8 seconds
Network when authenticated with
cellular network
Flashes every 8 seconds to
Signal indicate good signal
strength
Flashes every 8 seconds to
Power/Traffic indicate all is good in
network

7.3 Signal strength

Signal strength may indicate the quality of connection to a cellular tower. For 3G networks, this is
reported as RSSl (Received Signal Strength Indicator). For 4G, it is RSRP (Reference Signal
Received Power).
Signal strength units are –dBm; –70 is a stronger signal than –100.
Table 7-2: Signal strength
Quality estimate
Excellent -70 or greater -90 or greater
Good
Green
RSSI (3G) RSRP (4G)
dBm dBm
-71 to -85 -91 to -105
Blue
Flashes with traffic
to/from internal cell
modem
Flashes every 8
seconds to indicate fair
signal strength
Flashes with traffic on
RS-232 or CS I/O
CELL200-Series 4G LTE Cellular Module
LED Indicator Lights
Red
Flashes every 8 seconds
when issue with
network/settings
Flashes every 8 seconds to
indicate marginal or no
signal strength
Used to let user know it is in
low power state (only LED
flashing)
(p. 56).
56