The Rohde & Schwarz CMT55 is a digital radiocommunication tester engineered for development, production, and service-level testing of GSM mobile devices and modules. It delivers both rapid go/no-go testing for high-throughput production environments and detailed diagnostic capabilities for fault isolation and performance characterization across GSM900, GSM1800, and GSM1900 bands.
Technical Specifications
Supported Technologies & Frequency Coverage
• GSM900, GSM1800 (DCS1800), GSM1900 (PCS1900)
• DECT (with optional extensions)
• Full measurement capabilities: 100 kHz to 2000 MHz
Core Measurement Functions
• Signaling generation and measurement for DUT verification
• Multi-band handover testing (channel change, timeslot change, dual-band handover)
• Dynamic power ramp measurements per GSM specifications
• Peak power measurement and power ramp vs. time analysis
• SACCH measurements including RxLev, RxQual, and power level
• Bit-error rate (BER) measurement
• Phase and frequency error measurement
• DC current/voltage measurement (optimized for pulsed signals)
• Echo test for rapid component-level analysis
• Fast spectrum analysis via 5-pole filter modulation measurements
Advanced Testing Options
• High dynamic burst analysis (optional CMD-B42)
• Spectrum measurement unit (optional CMD-B43)
• Speech codec testing (optional CMD-B5)
Network & Device Simulation
• Mobile-to-base station synchronization
• Location update procedures
• Incoming/outgoing call setup and clearing
• Mobile power level control
• Base station survey with BCCH parameter simulation
Interfaces & Control
• IEEE-bus operation for high-speed testing
• RS-232-C for remote operation
• Centronics interface
• Multi-reference frequency input/output (optional CMD-B3) supporting GSM bit clock derivatives (270.8 kHz to 16× rates) and external frequencies from 1–13 MHz (1 MHz steps), plus 2.048 MHz, 26 MHz, 39 MHz, and 52 MHz options
– Key Features
User-friendly menu-driven interface with high-contrast backlit LCD and softkey navigation streamlines test execution. Dual-mode operation—fast go/no-go for production throughput and service mode for precision diagnostics—supports the full device lifecycle from development through field maintenance.
– Typical Applications
Production testing of GSM handsets and modules, type-approval validation, post-manufacture service diagnostics, and RF performance optimization during development cycles.
– Compatibility & Integration
Built on Rohde & Schwarz’s proven digital radiocommunication testing expertise, including legacy type-approval system heritage. Modular optional extensions enable tailored configurations for handset manufacturers, network operators, and service centers.
