External Connections; Bluetooth Antenna Connector - Teleorigin RB600 User Manual

5.2 External connections

5.2.1 GSM antenna connector
The SMA antenna input is used to connect an external GSM antenna. To establish
a connection with GSM network, an external antenna must be used. The type of antenna
depends on GSM coverage. In good circumstances (level of received signal is high) use
antenna which is included in the package. If the range of GSM is low or zero, an outdoor
or indoor (for instance in a place where GSM range is sufficient) antenna should be used.
Note: If there is no antenna connected to the SMA connector, connection with a GSM
network is impossible.
9