Rohde & Schwarz CMU-K20, Operating Manual

Page: 249 / 646

CMU-K20/K21/K22/K23/K24
Signalling: Connection Control
1115.6088.12 4.171 E-12
MCS9 Test Mode
Modulation and coding scheme 9
(MCS9)
specified for
EGPRS.
The four coding schemes CS1 to CS4 are defined for the GPRS packet-data traffic channels
(PDTCH). For most packet control channels, coding scheme CS1 is used. All coding
schemes CS1 to CS4 are mandatory for MSs supporting GPRS.
The nine modulation and coding schemes MCS1 to MCS9 are defined for the EGPRS
packet data traffic channels. For all EGPRS packet control channels the corresponding
GPRS control channel coding is used. Mobiles supporting EGPRS shall support MCS1 to
MCS9 in downlink and MCS1 to MCS4 in uplink.
The following traffic modes are used for tests on mobile phones equipped with an
AMR (Adaptive Multi-Rate) codec, available with option CMU-K45,
AMR GSM for
R&S CMU 200
:
AMR full rate
Test of full rate AMR codec (FR_AMR) with 8 modes and a data
rate up to 12.2 kbit/s
AMR half rate
Test of half rate AMR codec (HR_AMR) with 6 modes and a
data rate up to 7.95 kbit/s
The speech codecs must bee supported by the MS under test. Selecting one of the
AMR traffic modes opens an extended version of the
Network
tab with further AMR
settings; see section
Adaptive Multi-Rate (AMR) Speech Codec
on p. 4.203 ff.
Remote control
CONFigure:NETWork[:CSWitched]:SMODe:TRAFfic
[SENSe]:MSSinfo:TRAFfic?
Bit
Stream
The
Bit Stream
softkey determines the data transmitted on the traffic channel and
the signal path.
PSR 2E9-1
Transmission of the pseudo random sequence to CCITT O.153
PSR 2E11-1
Transmission of the pseudo random sequence to CCITT O.153
PSR 2E15-1
Transmission of the pseudo random sequence to CCITT O.151
PSR 2E16-1
Transmission of a pseudo random sequence
(Polynomial: x
16
+ x
5
+ x
3
+ x
2
+ 1)
Loopback
Loop-back with minimum delay: The CMU sends back all data
received on the TCH after 1 speech frame.
Echo
Loop-back with delay. The CMU sends back all data received on the
TCH after 50 speech frames (Echo) without invoking the speech
codec. If the CMU does not receive speech data in this operating
mode, it automatically transmits a bit pattern, producing “silence” in
the receiver of the mobile station.
Handset
The CMU sends and receives speech frames that are routed to the
internal speech codec (option CMU-B52). Analog signals are
provided via the
SPEECH
connector at the front panel of the
instrument. The analog input signal at connector
SPEECH
is
amplified by 22.5 dB.
Handset Low
The CMU sends and receives speech frames that are routed to the
internal speech codec (option CMU-B52). Analog signals are
provided via the
SPEECH
connector at the front panel of the
instrument. The analog input signal at connector
SPEECH
is not
amplified.
Decoder Cal
The speech codec (option CMU-B52) provides a 1 kHz sinewave
signal at its analog output. This signal is used for external calibration
of the analog output paths.
Encoder Cal
The speech codec (option CMU-B52) loops the input signal after
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