Base Unit

RF switching matrix/ front-end for easy adaptation to RF interface of DUT:

• RF1: In- / Output to connect high power BTS’s
• RF2: In- / Output to connect medium / low power BTS’s
• RF3 OUT: High power Output
• RF4 IN: Sensitive Input

  RF analyser 100 KHz - 2.7 GHz:

• Selective power meter
• Spectrum analyser incl. selectable RBW’s and sophisticated trigger- and timing-functions (10 MHZ - 2.7GHz)
• Time domain measurements (Zero Span Mode)

  RF generator 100 KHz - 2.7 GHz:

• Generation of CW / SSB / AM signals

  Additional Functionality:

• IEEE interface
• RS-232-C interface
• 2 PCMCIA slots
• Reference frequency IN- / Out-puts on rear panel
• New, sophisticated operational concept based on high resolution TFT colour display

GSM/EDGE

Test Modes

• Non-signaling mode

  This mode is particularly suitable for testing RF boards/modules with little or no signaling activity. The measurement starts completely independently from external trigger signals or signaling information. As soon as RF power is applied to the input, the tester starts to sample the incoming RF signal. When the corresponding RF parameters are calculated and displayed, the instrument is ready for the next measurement. All GSM/EDGE-specific TX measurements on signals with appropriate modulation scheme and midamble are available. In addition, the CMU300 is able to generate signals with GSM/EDGE-specific midamble and modulation in the entire frequency range from 10 MHz to 2.7 GHz. The analyzer and generator functionalities are not linked, i.e. any channel spacing between uplink and downlink signals is possible.

• Signaling mode

  The signaling mode is provided for testing modules or base stations supporting a certain level of signaling. In this mode, the tester operates synchronously to the BTS, i.e. it is synchronized to the TDMA frame structure, which is vital for receiver bit-error-rate measurement. All transmitter parameters can be tested separately for each timeslot. This function is necessary for testing base stations that support both GSM and EDGE. The ability to code / decode channels in realtime is the basis for synchronized measurements. The instrument can be synchronized to the base station in the following ways:

  • If the BTS has a multiframe clock out-put, the signal can be used to trigger the CMU300. An additional trigger line has to be taken into considera-tion. For BER tests and EDGE TX tests the 26 multiframe trigger is required.
  • If only the RF connection is used, the tester can synchronize to the C0 carrier of the base station, just like a mobile phone. This simplifies the test setup. However, a CCH carrier including FCCH / SCH channels and system information 1 to 4 must be activated in the BTS before measuring the used traffic channel. After successful synchronization there is permanent resynchronization to SACCH of TCH.

Overview TX Test GMSK

Power measurements:

• burst power (average/peak)
• power versus time (power ramp)

  Modulation analysis:

• phase error (peak/RMS)
• frequency error

  Spectrum measurements:

• spectrum due to modulation
• switching transients spectrum

  Additional functionality in signaling Mode:

• power versus slot measurement
• time slot selective measurements
• analysis of CCH information (frame timing; network data)
• analysis of SACCH information (requested power; requested timing)

Overview TX Test 8PSK

Power measurements:

• burst power (average / peak)
• power versus time (power ramp)

  Modulation analysis:

• EVM = error vector magnitude (peak / RMS)
• magnitude error (peak / RMS)
• phase error (peak / RMS)
• origin offset
• IQ imbalance
• frequency error
• 95th percentile

  Spectrum measurements:

• spectrum due to modulation
• switching transients spectrum

  Additional functionality in Signaling Mode:

• time slot selective measurements
• analysis of CCH information (frame timing; network data)
• analysis of SACCH information (requested power; requested timing)

Overview RX Tests

 

Channel type	Possible tests	Supported BTS/BSC loops	Supported loops inside R&S® CMU300	Channel setup procedure	Required SW options	Comments
No Coding	Burst by Burst (RAW BER)	BTS Loop demodulator / modulator	R&S® CMU300 RAW BER loop	Forced channel setup without signaling	R&S® CMU-K31 to -K34 (R&S® CMU-K41 optional for 8PSK)	GMSK and 8PSK supported
TCH/FS TCH/HS TCH/EFS	BER / RBER / FER	BTS (BSC) BER Loop with channel decoding; (optional loop via Abis)	R&S® CMU300 BER loop with channel decoding	Forced channel setup procedure (optional MOC / MTC)	R&S® CMU-K31 to -K36 (CMU-B71 and CMU-K39 optional)
TCH/F14.4 TCH/F9.6 TCH/F4.8 TCH/H4.8 TCH/H2.4	BER	BTS (BSC) BER loop with channel decoding	R&S® CMU300 BER loop with channel decoding	Forced channel setup procedure (optional MOC/MTC for full rate channels)	R&S® CMU-K31 to -K36 (R&S® CMU-K39 optional)
E-TCH/F43.2 NT	BER	BTS (BSC) BER loop with channel decoding	R&S® CMU300 BER loop with channel decoding	Forced channel setup without signaling	R&S® CMU-K31 to -K36 and CMU-K41
PDTCH-CS1 PDTCH-CS2 PDTCH-CS3 PDTCH-CS4	BER / DBLER	BTS (BSC) BER loop with channel decoding	R&S® CMU300 BER/DBLER loop with channel decoding	Forced channel setup without signaling (one static TS active on up- / downlink)	R&S® CMU-K31 to -K36	Special BTS test mode required, no RSC/MAC involved
PDTCH-MCS1 PDTCH-MCS2 PDTCH-MCS3 PDTCH-MCS4 PDTCH-MCS5 PDTCH-MCS6 PDTCH-MCS7 PDTCH-MCS8 PDTCH-MCS9	BER / DBLER	BTS (BSC) BER loop with channel decoding	R&S® CMU300 BER/DBLER loop with channel decoding	Forced channel setup without signaling (one static TS active on up- / downlink)	R&S® CMU-K31 to -K36 and CMU-K41	Special BTS test mode required, no RSC/MAC involved
TCH-AFS TCH-AHS	BER / RBER / FER	BTS (BSC) BER loop with channel decoding	R&S® CMU300 BER loop with channel decoding	Forced channel setup without signaling (one static TS active on up- / downlink)	R&S® CMU-K31 to -K36 and CMU-K37	Special BTS test mode required