
4. Cellular connectivity
The GlobalLink 520 is a cellular device which connects to LTE-M compatible 4G networks. The cellular provider of the included
SIM card is '1nce'. Their global network of operators is constantly expanding and you can check LTE-M coverage in your area
here: https://1nce.com/en/coverage/.
4.1. 4G LTE-M
LTE-M is the abbreviation for LTE Cat-M1 or Long Term Evolution (4G), category M1. This cellular technology is designed to
connect Internet of Things devices to existing 4G towers while using low energy. LTE-M does support handovers and roaming so
it is possible to use this device in a moving vehicle like a campervan (with an extrernal antenna).
4.2. Antenna
The GlobalLink 520 has an internal antenna and an SMA connector for an optional external antenna. A switch on the top of the
device determines which antenna is used. If the switch is set away from the SMA connector the internal antenna is used, when
set towards the connector the external antenna is used.
Do not set the switch to "external" if there is no external antenna connected, as this can permanently damage
your device.
The GlobalLink 520 is not rated for outdoor use. You can however connect your own outdoor antenna to the device to improve
your signal strength if the internal antenna does not have good enough reception (note: you can find the signal strength in VRM).
LTE-M uses the following frequencies: 703-803 and 2520-2620 MHz.
RSSI Signal strength Description
>= -65 dBm Excellent Strong signal with maximum data speeds
-65 dBm to -75 dBm Good Strong signal with good data speeds
-75 dBm to -85 dBm Fair Fair but useful, fast and reliable data speeds may be attained, but marginal
data with drop-outs is possibley
-85 dBm to -95 dBm Poor Performance will drop drastically
<= -100 dBm No signal Disconnection
4.3. Internal SIM card
Inside the device is a nano SIM card which is used for connectivity. This SIM is locked and can only be used in combination with
this specific GlobalLink device. It has a limited data bundle for the device to operate and receive updates over the air.
GlobalLink 520
Page 4 Cellular connectivity