Introduction:ADT400 is providing solution for ADSL2+ line and modem test. It can quickly locate where the problem point is by synchronized judging test between DSLAM and terminal user. Using ADT400 as user terminal, after synchronized with DSLAM, we can know the situation of ADSL and cable by the provided upstream and downstream rate/power attenuation/signal-to-noise/Cyclic redundancy check (CRC)/channel and protocol version information. These help analyze operators service quality. ADT400 also offers physical test as line voltage, loop resistance, insulation, capacitance, frequency domain attenuation, which is good for cable selection and after-sales maintenance of ADSL2+.Function feature Portable designBig color touching LCD screen3m of drop proofModem emulationDMM testPing testData storage and browseUser account setScreen calibrationComplied standard ITU G.994.1, ITU G.992.5, ITU G.992.5 Annex L, compatible with G.DMT, G.lite, T1.413 issue2; Transmission parameters test of ADSL lineADSL2+line Attenuation: 0~63.5dB;ADSL2+line Noise margin: 0~32dB;ADSL2+line Upstream rate: 0~1.2Mbps;ADSL2+line Downstream rate: 0~24Mbps;ADSL2+line local output power: 0~25dBm;ADSL2+line all types of statues: signal loss, URL close.MODEM simulation functionPING test: IP test, website addressDMM testVoltage test: 0~120V;Test loop resistance: 0~3000;Test capacitance: 100pF~0.8uF;Insulation resistance: 0~50Appearance size and Power dissipation Size: LxWxH=172x84x40mmBattery: 7.4V/1800mAH rechargeable lithium batteryPower dissipation: 3.5W. Automatically power off without button touching more than 20 minutes.Weight: 340g