... S, Hsdpa: 7.2mb/S RS485: a, B Interface: RS232, RS485 Standard and Band: GSM850/900/1800/1900MHz 3G ... , CSD and data function8. Standard AT command interface B. Hardware System1.Interface RS232 serial port, rates: 110~230400bits/s ... "Power", "ACT", "Online"Antenna interface: Standard SMA female interface, 50 ohmSIM/UIM interface: Standard user card interfacePower interface: Standard 3-PIN power jack2. ...