Introduction to the SINAUT ST7 system
1.5 Mobile wireless components
Station control system
System Manual, 07/2009, C79000-G8976-C178-07
45
Technical specifications of the MD741-1 GPRS modem
MD741-1
General
Interfaces
• Application interface
• Service interface
• Antenna connector
• Connection to power supply
• RJ-45 female (10/100 Mbps, TP,
autocrossover)
• USB socket type A
• SMA female connector,
nominal impedance: 50 ohms
• 4-pin screw terminal
Power supply 12 - 30 V DC (24 V DC nominal)
Current consumption
• on an existing GPRS connection with data
exchange and GSM900 power level 10
(transmit power: 23 dBm)
• I
n
: 147 mA at 24 V (I
burst
: 550 mA)
4.62 ms burst repetition rate
Power loss typically 4.0 W at 24 V
Permitted ambient conditions
• Operating temperature
• Transport/storage temperature
• Relative humidity
• -20°C through +60°C
• -40°C through +70°C
• Max. 95 % at +25°C
Construction
• Design
• Materials
• Dimensions (W x H x D) in mm
• Weight
• DIN rail housing
• Plastic
• 45 x 99 x 114
• Approx. 280 g
Installation Snap onto 35 mm standard rail
Degree of protection IP20
GSM/GPRS
Frequency ranges 800, 900, 1800 and 1900 MHz
Transmit output power (for 8-PSK)
• 850 / 900 MHz
• 1800 / 1900 MHz
• +27 dBm (±3 dB)
• +26 dBm (+3 / -4 dB)
GPRS multislot class Class 12...8:
• 1...4 downlinks
• 1...4 uplinks
max. 5 slots
EGPRS multislot class Class 12...8:
• 1...4 downlinks
• 1...4 uplinks
max. 5 slots
GPRS coding methods CS-1, CS-2, CS-3, CS-4
GPRS connection establishment Automatic when power supply turned on
Virtual Private Network (VPN)
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