The Rohde & Schwarz CMD55 is a digital radiocommunication tester delivering comprehensive signaling, RF generation, and measurement capabilities for mobile phones and wireless devices across GSM900, GSM1800, and GSM1900 bands. Purpose-built for R&D and production environments, it executes fast go/no-go tests alongside detailed burst analysis and call-flow verification. High-speed IEEE-bus operation enables rapid throughput in manufacturing; optional measurement modules extend functionality to audio analysis, real-time speech codec testing, and GSM-specific spectrum characterization.
Technical Specifications
RF Generator
• Frequency coverage: GSM900 (935.2–959.8 MHz), GSM1800 (1805.2–1879.8 MHz), GSM1900 (1930.2–1989.8 MHz)
• Output level RF IN/OUT: −35 to −120 dBm
• Output level OUT2: +11 to −77 dBm
Measurement Capabilities
• Peak power, SACCH metrics (RxLev, RxQual, power level), and full dynamic power ramp per GSM specifications
• Bit-error rate (BER), phase error, and frequency error measurement (Option CMD-B4)
• High-dynamic burst analysis exceeding 72 dB dynamic range
• Narrowband RF spectrum analysis with 5-pole filter modulation measurement
• DC voltage and current measurement; echo testing
Signaling & Call Flow
• Mobile-to-base synchronization, location update, incoming/outgoing call setup
• Mobile power control, handover (channel/timeslot change), dual-band handover
• Call termination by mobile and network
– Key Features
• Support for DECT fixed and portable parts testing (ETSI CTR06) via optional extension
• Power ramp measurement as function of time (Option CMD-B4)
• AF measurement unit with frequency counter to 60 MHz, voltmeter, and distortion meter (CMD-B4)
• Multitone audio generator and analyzer to 8460 Hz (CMD-B43)
• Real-time speech encoder/decoder (CMD-B44)
• GSM-specific signal and trigger adapters (CMD-B61, CMD-B62)
– Typical Applications
• Device type approval and conformance testing
• Manufacturing line RF and signaling validation
• Handover and dual-band functionality verification
• Audio codec and speech path characterization
• Burst transmission analysis and modulation quality assessment
– Compatibility & Integration
The CMD55 integrates via fast IEEE-bus interface. Measurement and signal generation options expand test scope without replacing core hardware. GSM-specific trigger and signal modules support synchronized audio and RF analysis across multiple test domains.
