09_RN28199EN20GLA0_TCSM Functions and settings.pdf
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Transcript of 09_RN28199EN20GLA0_TCSM Functions and settings.pdf
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8/10/2019 09_RN28199EN20GLA0_TCSM Functions and settings.pdf
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TCSM Functions and SettingsRG20 (BSS)
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Objectives
After completing this learning element, the participant
should be able to: Creating Transcoding and Rate Adaptation Unit (TRAU)frame
Explain principle of Acoustic Echo Cancellation (AEC) andAutomatic Level Control (ALC)
Explain principle of Tandem Free Operation (TFO) andNoise Suppression (NS)
Interrogate and modify setting of TCSM3i
Refer to RG20 Documentation:
Functional area descriptions\ Transmission and transport\ TCSM3iFunctionalities\ Additional Features
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Example:FR TRAU frame
12345678
9101112131415161718192021222324252627282930313233
34353637383940
001
C81
D81
D23
1D38
1D53
1D68
1D83
1D98
1D113
1D128
1D143
1D158
1D173
1D188
1D203
1
D2181D233
1D248
1C18
00
C1C9D1D9D16D24
D31D39D46D54D61D69D76D84D91D99D106D114D121D129D136D144D151D159D166D174D181D189D195D204D211
D219D226D234D241D249D256C19
00
C2C10D2D10D17D25
D32D40D47D55D62D70D77D85D92
D100D107D115D122D130D137D145D152D160D167D175D182D189D196D205D212
D220D227D235D242D250D257C20
00
C3C11D3D11D18D26
D33D41D48D56D63D71D78D86D93D101D108D116D123D131D138D146D153D161D168D176D183D190D197D206D213
D221D228D236D243D251D258C21
00
C4C12D4D12D19D27
D34D42D49D57D64D72D79D87D94
D102D109D117D124D132D139D147D154D162D169D177D184D191D198D207D214
D222D229D237D244D252D259
T1
00
C5C13D5D13D20D28
D35D43D50D58D65D73D80D88D95
D103D110D118D125D133D140D148D155D163D170D178D185D192D199D208D2151
D223D230D238D245D253D260
T2
00
C6C14D6D14D21D29
D36D44D51D59D66D74D81D89D96
D104D111D119D126D134D141D149D156D164D171D179D186D193D200D209D216
D224D231D239D246D254C16T3
00
C7C15D7D15D22D30
D37D45D52D60D67D75D82D90D97D105D112D120D127D135D142D150D157D165D172D180D187D194D201D210D217
D225D232D240D247D255C17T4
1 2 3 4 5 6 7 8Octetno.
Bit number
One full rate TRAU frame consists of 260 bits speech/data information together with60 bits that are used for creating the TRAU frame structure (in-band signallingbetween the two DSPs in the BTS and in the TCSM).
Those 60 control bits contain information like frame alignment word, frame type,channel type, time alignment information, DTX on/off etc.
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Acoustic Echo Cancellation (AEC)
Echo No echo
Downlink
Uplink
Acousticecho
TCSM MGW
ECU
AEC
BTS BSC
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Automatic Level Control (ALC)
ALC is a speech enhancement feature, which automatically adjusts the
level of a speech signal towards a predefined target level, either amplifying
or attenuating the signal. In general, quiet signals are amplified and loud
signals are attenuated. This is done to compensate the varying signal levels in the network
resulting from various circumstances like different user equipment,
communication conditions, different speaker etc.
ALC configurations include: Constant mode: sets a fixed gain for a specific direction (UL/DL). In this
mode, the amplification/attenuation process is not affected at all by the input
speech signal itself, but solely by the predefined gain parameter.
Adaptive mode: automatically introduces gain/loss to the speech signal to
keep it at a predetermined target level.
Adaptive mode with noise compensation: In addition to the predefined target
level in adaptive mode, ALC module operation may also be controlled partly
by the noise level measured from the opposite direction. That is, target levelis adjusted depending on the noise level. When the noise level exceeds a
certain threshold, the target level starts to increase. Noise compensation
improves intelligibility when the user is in a high noise environment.
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Tandem Free Operation (TFO)
TFO in use8 or 16 kbits/s
BSS
TRAU
MGW
DecodingDecoding
Encoding
A side B side
BSS
TRAU
MGW
EncodingDecoding
Decoding
MSbMSa
TFO not in use64 kbits/s
PLMNPLMN
Tandem Free Operation
In mobile-to-mobile (MS-MS) calls the so-called Tandem Connection between twoTRAUs performs unnecessary speech encoding and decoding which decreasesspeech quality.
The Tandem Free Operation feature increases speech quality by preventing theunnecessary encoding and decoding.
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Noise Suppression
When activated, the Noise Suppression (NS) algorithm processes the
uplink and/or downlink speech samples to reduce the background noise
level during speech calls
Background noise is efficiently reduced in both directions
Reduced noise
TCSM2
NS
BTS BSC MSC
NS
BSS
Noise Reduced noise
Noise
Noise level is reduced without attenuation of speech signal.
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Local and remote operation of the TCSM 3i
BSCTCSM3i
TR3
ET ET
Ater
OMU
TSL 1
TC-LAPD
Functions related to operation and maintenance can be carried out:
by a remote session from the BSC or the OMC using the TC-LAPDin TSL 11,2bit
by using a local terminal with the following line parameter settings:
Bit rate: 9600 bit/s or 19200 bit/s
Data bits: 7
Parity: even
Stop bits: 1
Note:
For local session, connect your PC or VDU to the front panelof TR3. The TR3 features a RS232 interface and a RJ 45
connector. The cable used depends on your terminal.
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either/or
USERNAME> EXPERT
PASSWORD> SYSTEM
ZR?C
DISPLAY CHANNEL CONFIGURATIONZRC:PCM INDEX;
PCM INDEX BYTE 1..7TIME SLOT BYTE 1..24 (ANSI); 1..31 (ETSI)PARAMETER BYTE 1..11
1 = THROUGH CONNECTION2 = DOWNLINK DTX3 = LOOP TEST 04 = LOOP TEST 15 = CHANNEL STATE6 = TIME ALIGNMENT7 = FIXED GAIN ADJUSTMENT8 = ADAPTIVE GAIN ADJUSTMENT
10 = ACOUSTIC ECHO CANCELLATION PARAMETERS11 = TANDEM FREE OPERATION PARAMETERS
TC-MML Command Syntax 1
ZRC:1:1;
ZRC:1,15;
Refer to RG20 Documentation:
Reference\ Commands\ Service terminal commands\ TCSM3icommands
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TC-MML Command Syntax 2
ZE?C
E1 FUNCTIONAL MODES MODIFICATIONZEC:PCM INDEX:FUNCTIONAL MODE,FRAME ALIGNMENT MODE,USE OF SA-BITS;
PCM INDEX BYTE 0..7 /CHAR_3 ALL = ALL PCM LINES
FUNCTIONAL MODE CHAR_4NORM ... NORMAL MODESATR ... THROUGH CONNECTION OF SA-BITSV11M ... V.11 MODETRSP ... TRANSPARENT MODE
FRAME ALIGNMENT MODE STRDBLF ... DOUBLE FRAME MODECRC4 ... CRC MODEPARAMETER IS NOT GIVEN IF FUNCTIONALMODE IS TRSP
USE OF SA BITS STRB56 .... BITS 5 AND 6 IN Q.1 USEB5678 .. BITS 5,6,7 AND 8 IN Q.1 USEALLOWED AND OBLIGATORY IF FUNCTIONAL
MODE IS V11M
ZEC:1:NORM,DBLF;ZEC:ALL:NORM,CRC4;
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Interrogate TCSM settings
Transcoder equipment ZGT
Software in TR3 ZGI:TR3;
FPGA ZGI:FPGA;
DSP ZGI:DSP;
ET ZGI:ET;
PCM Lines / Types ZRD
Through Connections ZRC
Monitor A-Interface circuits ZRM
Transcoder functions(TFO, AEC, ALC,...) ZRC
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Exercises: Interrogate/modify settings of TCSM3i
Exercise: Interrogate and modify transcoder settings. Duration: approx. 30min
You are working on TSCM.
Start a remote or a local session to your TCSM!
___________________________________________________________________________
What kind of TCSM is this (Cartridge Master, Cabinet Head Master, )?
___________________________________________________________________________
How many A-IF PCMs are configured?
___________________________________________________________________________
How are they used (HR/FR/data)?
___________________________________________________________________________
Is ALC used?
___________________________________________________________________________
Switch all available additional features (AEC, ALC, TFO, NS) on!
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________