User guide

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Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
8.2.4.2 External GSM Antenna
TheexternalGSMantennaisconnectedtothemodemviatheSMA/Mconnector.Itmusthavethecharacteristics
listedinthetablebelow.
Table: External GSM antenna characteristics
Antenna frequency range 850/900/1800/1900 MHz
Impedance 50 Ohms nominal
DC Impedance 0 Ohm
Gain (antenna + cable) 0 dBi (in a minimum direction)
VSWR (Rx max TX max) 1.5:1
Polarisation Linear
Note: See chapter 10 Recommended Accessories for GSM antenna recommended by ERCO & GENER.
8.2.5 RESET Signal
Typical Reset Connection
Table : RESET signal operating conditions
Parameter Condition Min. Typ. Max. Unit
VIL Input Voltage – Low or float 0.58 Vdc
VIH Input Voltage – High 1.36 1.95 Vdc
IPU Internal Pull-Up Resistor -40 -31 -15 µA
IIL Current sink -2.0 mA
Reset Pulse Duration 10 mS