专线调制解调器介绍：ModulationMulti-dimension TCM(2400 ~ 33600bps) QAM&TCM(4800 ~ 14400bps) QAM(2400bps) DPSK (1200bps) FSK(0 ~ 300bps)CompatibilityITU-T V.34 / V.32bis / V.32 / V.22 / V.22bis / V.21 / V.23, VFC, Bell 103/212A/V.13 HDXOperationFull duplex or simulated half duplex signalling on 2-wire PSTN or 2/4wire leassed line with dial backup, Power-on auto dial-up with auto re-dial, Power-on leased-line auto connectionAuto dial, Auto answer, Manual dial, Manual answerSynchronous/Asynchronous, AutoSync.DTE Speed115200 / 57600 / 38400 / 19200 / 9600 / 4800 / 2400 / 1200 / 300 bpsError ControlITU-T V.42 and MNP4CompressionITU-T V.42bis and MNP5Cellular Phone ProtocolMNP10Multi-Mode HandshakeAutomode disabled / enabled with / without ITU-T V.8Command CompatibleHayes 'AT' Extended command set or V.25bis command setLCD ControllerOperation by menu driven with password lockDiagnosticITU-T V.54 Loop back test (Digital, Analog, Remote Digital) with 511 and U test pattern, Power on self testFlow ControlXon / Xoff, CTS / RTS, DTR / DSR uni-or bi-directionalRetrainAuto- or manual-retrain with fall forward / fallback rate negotiationSecurityCall back security with Max. 20 telephone numbers and passwordStorageMax. 10 telephone numbers and 10 user profilesRemote ConfigurationFull function configurable through front panel LCD and by Network Management System (NMS)Receive Sensitivity-4 to -43 dBmVoiceOptionalG III FAXG3 / EIA Class 1 , Class 2 , ITU-T V.17 / V.27ter / V.29Transmit LevelSelectable from : 0 to 31 dBm for leased lineSelectable from : 0 to -15 dBm for PSTNCall Progress MonitorBusy tone, Dial tone, Ring backTerminal InterfaceEIA RS-232C D-type 25 pin connector with ITU-T V.24 / V.28 recommandationEnvironmentOperating Temperature : from 0 degree to 45 degreeStorage Temperature : from -10 degree to 80 degreeRelative Humidity : from 0% to 95% non-condensingPower RequirmentAC 90 ~ 260 Volts / 47 ~ 63Hz or DC 12 / 48Volts