Dongguan Jie Tong Electronic Instrument Co., Ltd. 
 Contact: Mr. Zhou 
 Tel: 13760331089 
 QQ: 1511158498 
 T: 0769-82086182 
 F: 0769-82086182 
 Zip Code: 523710 
 Address: Hung Lai Yuen Road, Zhenjiang Tangxia Garden 3 6F 

 CMD55 Features: 
 * Is a measure of GSM and GSM1800 mobile phone tighter type unit 
 ? Through RS232, IEC / IEEE Remote Control 
 * Multi-function front panel connector 
 * Voice coder / decoder can be integrated 
 * Optional ammeter and voltmeter 
 ? High sensitivity two RF input 
 Can be improved for GSM, GSM1800 and GSM1900 test 

 CharacteristicsThe 
 CMD52 is a compact unit for testing GSM900 mobiles. The CMD55 is 
 furthermore capable of testing GSM1800 (formerly named PCN orDCS1800) 
 and GSM1900 (formerly named PCS or DCS1900) mobile phones. Both models 
 are favourably priced and combine small dimensions with high 
 measurement accuracy and speed.The testers range of capabilities 
 includes all signalling, generator and measurement functions required 
 for verifying the correct operation of the DUT (Device Under Test). 
 Thanks to its fast go / nogo tests and accurate analysis using optional 
 extensions, CMD52 and CMD55 are equally well suited for R & D, production 
 and high-end service and production.Based on the wide-range know-how 
 of Rohde & Schwarz in digital radiocommunication testing, which not 
 least was obtained in developing type-approval test systems such as 
 the GSM900 and GSM1800 system simulators, both CMD models are top- 
 grade testers for present and future measurement applications.Test 
 capabilitiesTo test mobile phones, the CMD simulates a GSM900, 1800 
 or 1900 base station. One of the two RF synthesizers available for 
 this purpose delivers a continuous BCCH signal while the other one 
 provides all 8 timeslots for TCH signals.The major test functions are 
 : Mobile synchronizationLocation updateIncoming call setupOutgoing 
 call setupMobile power level controlHandover (channel change, timeslot 
 change) Peak power measurementHigh dynamic range burst analyzer 
 (Option CMD-B4 and CMD-B42) Spectrum due to Switching measurement 
 (Option CMD-B4 and CMD-B43) Spectrum due to Modulation measurement 
 (Option CMD-B4 and CMD-B43Timing Advance measurementSACCH measurement 
 (Eg RxLev, RxQual, power level) Echo testCall clearing by mobile 
 phoneCall clearing by CMDDC current / voltage measurementsPhase and 
 frequency error measurement (option CMD-B4) Measurement of power 
 ramping as a function of time (option CMD-B4) Bit-error rate (BER)