53 (148)
Base station assisted location only supports two dimensional location of the device (no altitude).
Signal Strength
The signal quality has decisive influence on the speed of the data transmission. Low signal
strength may decrease the transmission speed significantly or even completely drop the
connection and may result in a loss of function of the device. A general signal strength to
connection quality correlation is given by the following table:
Under -101 dBm
Bad
-101 dBm to
-90 dBm
Weak
-89 dBm to
-80 dBm
Medium
-79 dBm to
-65 dBm
Good
Over -65 dBm
Excellent
To ensure a stable connection and an adequate performance of all the communication functions
of the device, please make sure that the signal level is at least -79 dBm (Good).
Critical Applications
Cellular telecommunication devices operate using radio signals and therefore are not guaranteed
to have a reliable connection in all conditions. You should not rely solely on a wireless device for
reliable continuous data transmission.
Antenna
Keeping your body close to a cellular antenna might negatively affect your health. Usage of
antennas with higher a gain of more than 2.3 dBi might require further approval.
Event Log Messages
The following section describes the messages that the cellular modem driver may log to
the
. All messages are prefixed with the text
Cellular Modem Driver:
.
•
Stopped
The cellular modem driver has been stopped.
•
Started
The cellular modem driver has been started.
•
Running
The cellular modem driver is now running.
•
Deactivated
The cellular modem driver has been temporarily deactivated.
•
Activated
The cellular modem driver has been re-activated after temporary deactivation.
•
Powered modem
The supply voltage for the cellular modem hardware has been switched on.
•
Modem initialised (RSSI:
<x>
dBm)
The cellular modem has been successfully initialised. The RSSI value ranges from
<=
-113
to
= -51
dBm.
Anybus Edge Gateway Reference Guide
SCM-1202-154 1.0 en-US