The Rohde & Schwarz CMD57 is a digital radiocommunication tester tailored for comprehensive measurements on GSM base stations (BTS) and BTS modules. Supporting GSM900, E-GSM, and UIC, with optional support for GSM1800 and GSM1900, it provides high-precision transmitter and receiver testing without disrupting active telephone calls.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | RS-232-C, IEC/IEEE-488 (GPIB) |
| Display | LCD display with softkeys on both sides |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 100 V to 240 V AC (±10%), 50 Hz to 60 Hz / 400 Hz |
| Operating Temperature | 5 °C to 45 °C |
| Dimensions (W×H×D) | 435 mm × 170 mm × 415 mm |
Protocol & Call Processing
| Parameter | Value |
|---|---|
| Supported GSM Bands | GSM900, E-GSM, UIC (European train radiotelephony), GSM1800 (optional), GSM1900 (optional) |
| Bit Error Rate (BER) Measurement Interfaces | Abis interface, IEEE bus, RS-232-C interface, BTS loopback, CMD loopback |
RF Analyzer (Receiver & Transmitter Testing)
| Parameter | Value |
|---|---|
| Dynamic Range | >72 dB (for checking power ramps and output spectrum) |
| Adjacent Timeslot Rejection | Up to 50 dB higher level (for BTS AGC testing) |
| Transmitter Power Ramp Measurement | Checking switching characteristics of BTS transmitter |
| Phase and Frequency Error Measurement | Testing modulation characteristics including statistical function |
| Spectrum Measurements | Spectrum measurement due to modulation or switching |
| RF Monitor Bandwidths | 30 kHz and 100 kHz (replaces external spectrum analyzer) |
| Module Test Functionality | Complete transmitter measurements without signaling or time synchronization |
RF Signal Generator (Transmitter Simulation)
| Parameter | Value |
|---|---|
| Multifunction RF Generator | Integrated for receiver module alignment |
Connectivity & Interfaces
| Parameter | Value |
|---|---|
| Remote Control Protocol | SCPI-compatible remote control |
| Software Update Method | Simple download via the RS-232-C interface |
RF Connections
| Parameter | Value |
|---|---|
| RF Input/Output Impedance | 50 Ω |
| Main RF Connector Type | N-type (female) |
| Auxiliary RF Connectors | BNC (female) |
| Reference Frequency Input/Output | 10 MHz, BNC |
RF Analyzer
| Parameter | Value |
|---|---|
| Max RF Input Power (RF IN/OUT) | +47 dBm (GSM peak power) |
Reference Oscillator
| Parameter | Value |
|---|---|
| Reference Oscillator Frequency | 10 MHz |
| Reference Oven Option | CMD-B1 (OCXO) |
GSM Features
| Parameter | Value |
|---|---|
| Supported Speech Codecs | Full Rate (FR), Enhanced Full Rate (EFR), Half Rate (HR) |
| GSM Phase Support | Phase 1, Phase 2, Phase 2+ |
Transmitter Measurements
| Parameter | Value |
|---|---|
| Peak Power Measurement Range | 0 dBm to +47 dBm |
| Peak Power Measurement Accuracy | < 0.6 dB (GSM900), < 0.9 dB (DCS1800/PCS1900) |
Receiver Measurements
| Parameter | Value |
|---|---|
| RF Generator Output Level Range (RF IN/OUT) | -33 dBm to -120 dBm |
Technology
GSM
Applications
Base station (BTS) and BTS module testing
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