Specifications

2.7 Antenna Interface
In order to send or receive data connect an external RF antenna to the SMA connector which is
internally connected to the RF signal of the GSM module.
Please consider that the recommended antenna equipment has been chosen to achieve optimum RF
performance when operating the Java Box Terminal.
Frequency range Depending by frequency band(s) provided by the network operator, the
customer shall use the most suitable antenna for that/those band(s)
Bandwidth 80 MHz in EGSM 900, 70 MHz if GSM 850, 170 MHz in DCS, 140 MHz
PCS band
Gain 1.5dBi <= Gain < 3dBi (referenced to isotropic radiator)
Impedance 50 Ohm
Input power > 2 W peak power
VSWR absolute max <= 10:1
VSWR recommended <= 2:1
Table 6: Antenna speciation
2.8.1 Operating Frequency
The operating frequencies in GSM, DCS, PCS modes are conform to the GSM specifications.
Mode Freq. TX (MHz) Freq. RX (MHz) Channels (ARFC) TX - RX offset
890.0 - 914.8 935.0 - 959.8 0 – 124 45 MHz
E-GSM-900
880.2 - 889.8 925.2 - 934.8 975 - 1023 45 MHz
GSM-850 824.2 – 848.8 969.2 – 893.8 128 - 251 45 MHz
DCS-1800 1710.2 - 1784.8 1805.2 - 1879.8 512 – 885 95 MHz
PCS-1900 1850.2 - 1909.8 1930.2 - 1989.8 512 - 810 80 MHz
Table 7: Operating frequencies
Transmitter output power
GSM–850 / 900
The Java Box modem in GSM–850/900 operating mode are class 4 in accordance with the
specification which determine the nominal 2W peak RF power (+33dBm) on 50 Ohm.
DCS–1800 / PCS-1900
The Java Box modem in DCS–1800/PCS-1900 operating mode are of class 1 in accordance with the
specifications which determine the nominal 1W peak RF power (+30dBm) on 50 Ohm.
Reference sensitivity
GSM–850 / 900
The sensitivity of the Java Box modem according to the specifications for the class 4
GSM–850/900 portable terminals is –107dBm typical in normal operating conditions.
DCS–1800 / PCS-1900
The sensitivity of the Java Box modem according to the specifications for the class 1
portable terminals DCS-1800 / PCS-1900 is –106 dBm typical in normal operating conditions.
2.9 SIM Interface
The SIM interface is intended for 3V SIM cards. The card holder is a five wire interface according to
GSM 11.11. A sixth pin has been added to detect whether or not the SIM card drawer is inserted.
Removing and inserting the SIM card during operation requires the software to be reinitialized.
Therefore, after reinserting the SIM card it is necessary to restart Java Box Terminal.
Java Box Hardware Interface Description
Released