The Rohde & Schwarz CMD55 is a digital radiocommunication test set designed specifically for testing GSM mobile stations. It supports multi-band operations covering GSM900, DCS1800, and PCS1900 networks, enabling comprehensive transmitter, receiver, and signaling measurements in development, production, and service environments.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | GPIB (IEEE-488.2), RS-232-C (9-pin), Centronics printer port |
| Display | Monochrome backlit graphics LCD |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 100 V to 240 V AC (±10%), 50/60 Hz |
| Operating Temperature | 5 °C to 45 °C |
| Dimensions (W×H×D) | 435 mm × 165 mm × 460 mm |
| Weight | 14 kg |
Protocol & Cellular Signaling Options
| Parameter | Value |
|---|---|
| Supported Cellular Standards | GSM 900 (including E-GSM), DCS 1800, PCS 1900 |
| Testing Capabilities | GSM Phase 1 and Phase 2 mobile station tests |
| Call Processing & Signaling Simulation | Call setup, call release, call clearing, handover (channel, band, power level) |
| Receiver Sensitivity Measurements | Bit Error Rate (BER), Residual BER (RBER), Fast BER |
RF Signal Generator (Transmitter Source)
| Parameter | Value |
|---|---|
| Modulation Format | GMSK (Gaussian Minimum Shift Keying) |
General RF System Specifications
| Parameter | Value |
|---|---|
| RF Input/Output Port | N-type (female), 50 Ω (RF IN/OUT) |
| Internal Reference Frequency | 10 MHz |
Interfaces & Connectivity
| Parameter | Value |
|---|---|
| Reference Frequency Input/Output Connectors | BNC (female) |
Physical, Environmental & Power
| Parameter | Value |
|---|---|
| Power Consumption | approx. 120 W |
RF Generator
| Parameter | Value |
|---|---|
| RF Generator Frequency Range (GSM 900) | 925 MHz to 960 MHz |
| RF Generator Frequency Range (DCS 1800) | 1805 MHz to 1880 MHz |
| RF Generator Frequency Range (PCS 1900) | 1930 MHz to 1990 MHz |
| RF Generator Output Level (RF1) | -33 dBm to -120 dBm |
| RF Generator Output Level (RF3 OUT) | 0 dBm to -120 dBm |
RF Analyzer
| Parameter | Value |
|---|---|
| RF Analyzer Frequency Range (GSM 900) | 880 MHz to 915 MHz |
| RF Analyzer Frequency Range (DCS 1800) | 1710 MHz to 1785 MHz |
| RF Analyzer Frequency Range (PCS 1900) | 1850 MHz to 1910 MHz |
| Maximum RF Input Power | +47 dBm (peak) |
Measurements
| Parameter | Value |
|---|---|
| Power Measurement Range | +10 dBm to +47 dBm |
Receiver Measurements
| Parameter | Value |
|---|---|
| Phase Error Measurement Accuracy | < 1.5° RMS, < 5° peak |
| Frequency Error Measurement Accuracy | < 15 Hz + reference frequency error |
| Timing Advance Measurement Range | 0 to 63 bit periods |
| Power Ramp Dynamic Range | > 55 dB |
Technology
GSM / Cellular
Applications
GSM Mobile Station Testing