The Rohde & Schwarz CMU300 is a universal radio communication tester purpose-built for GSM, GPRS, and EDGE base station validation across development, production, commissioning, and field service. Its modular architecture supports technology upgrades while delivering integrated RF parametric testing and Layer 1 signaling procedures. The instrument combines signal generation, spectrum analysis, and real-time channel coding/decoding in a single platform.
– Technical Specifications
Frequency Range: 10 MHz to 2.7 GHz
RF Generator: Up to +13 dBm output (RF3 OUT); generates signals from −130 dBm to +13 dBm for receiver testing.
RF Analyzer Input:
• RF1: Up to +47 dBm (high-power base stations)
• RF2: Up to +33 dBm (medium/low-power base stations)
• RF4 IN: −80 dBm to 0 dBm (sensitive input)
• Full dynamic range: +47 dBm to −80 dBm
Modulation Support: GMSK, 8PSK
Signal Generation: Continuous, SSB, and AM modes with GSM/EDGE-specific midamble and modulation schemes.
– Key Features
• Burst-by-burst transmit mode without error protection
• Per-timeslot transmitter parameter testing for GSM and EDGE base stations
• BER and RBER/FER measurement modes for circuit-switched traffic channels
• Real-time channel coding and decoding with synchronized operation
• Power control modes 1 and 2 for transmitter testing
• I/Q signal analysis: EVM, peak code domain error power, I/Q offset, and I/Q imbalance
• Spectrum analyzer with selectable resolution bandwidths and advanced trigger/timing functions
• Time-domain measurements via Zero Span Mode
• Selective power meter
• RF and Abis loop testing (Option R&S CMU-B71)
• Synchronous TDMA frame operation with base station synchronization to C0 carrier
• ETSI-compliant frequency hopping with manual parameter entry
• High-precision measurement correction across frequency range and dynamic range
– Typical Applications
Base station RF module development and characterization, production testing, network commissioning, and field service troubleshooting.
– Compatibility & Integration
Supports GSM/EDGE base stations. RF-only synchronization to base station C0 carrier. SACCH/TCH resynchronization after initial acquisition.
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