Perle Systems NOVACOM Wireless Modem GNS-30CR - Manual (Page 14)

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7.3 Antenna connector SMA (female)
A quad band antenna (GSM850/EGSM900/DCS1800/PCS1900) can be
connected to the RF interface. The connection is implemented as a 50 Ω SMA
(female) coaxial jack.
Pin assignments:
Signal name Pin Function
RF Input RF Input/Output
GND Output Frame connecting