5.37.2.6. Trunk Configuration 
In normal circumstances, the parameters of the VC trunks are based
on the parameters of the partner trunk. However there are some parameters
which have to be different:
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The VCM trunk requires a COT which contains
the parameter SPCM. All other trunks should not have this COT parameter.
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The VC trunk has to be added with the device
type VCCONN (digital tie trunk circuit with voice compression).
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The VC trunks should be in own trunk groups.
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The VCM has, depending from board type, 7 or
15 B-channels.
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The protocol variants CORNV33 or ECMA1 should
be used prevered because they support the new protocol element "Allowed
Compression/Decompression Cycles".
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The two corresponding VCM trunks (Node A / Node B) have to be configured
with a MASTER/SLAVE relation (like S0/S2 trunks). This has to be controlled
by the loadware parameter.
Example of a S2/VCM Configuration:
The different/important parameter values are marked bold.
S2 Trunk:
ADD-TDCSU:OPT=NEW,PEN=1-2-49-0,COTNO=20,COPNO=0,DPLN=0, ITR=0,COS=1,LCOSV=1,LCOSD=1,CCT=" ",DESTNO=0, PROTVAR=CORNV33,SEGMENT=1,TCHARG=N,SUPPRESS=0,TRACOUNT=31, SATCOUNT=MANY,NNO=604,ALARMNO=0,FIDX=1,CARRIER=1, ZONE=EMPTY,FWDX=1,DEV=S2CONN,TGRP=98,SRCHMODE=ASC, BCHAN=1&&30,BCNEG=Y,BCGR=1,INS=N,LWPAR=8;
VCM Trunk:
ADD-TDCSU:OPT=NEW,PEN=1-1-55-0,COTNO=50,COPNO=0,DPLN=0, ITR=0,COS=1,LCOSV=1,LCOSD=1,CCT=" ",DESTNO=0, PROTVAR=CORNV33,SEGMENT=1,TCHARG=N,SUPPRESS=0,TRACOUNT=31, SATCOUNT=MANY,NNO=604,ALARMNO=0,FIDX=1,CARRIER=1, ZONE=EMPTY,FWDX=1,DEV=VCCONN,TGRP=99,SRCHMODE=ASC, BCHAN=1&&15,BCNEG=Y,BCGR=1,INS=N,LWPAR=8;
Example of a S0/VCM Configuration:
The different/important parameter values are marked bold.
S0-Trunk:
ADD-TDCSU:OPT=NEW,PEN=1-02-115-0,COTNO=20,COPNO=0,DPLN=0, ITR=0,COS=1,LCOSV=1,LCOSD=1,CCT=" ",DESTNO=0, PROTVAR=CORNV33,SEGMENT=1,TCHARG=N,SUPPRESS=0,TRACOUNT=31, SATCOUNT=MANY,NNO=604,ALARMNO=0,FIDX=1,CARRIER=1, ZONE=EMPTY,FWDX=1,DEV=S0CONN,INS=Y,TGRP=100,SRCHMODE=ASC, MASTER=Y,SMD=Y,CNTRNR=0,BCNEG=N;
VCM-Trunk:
ADD-TDCSU:OPT=NEW,PEN=1-01-067-0,COTNO=50,COPNO=0,DPLN=0, ITR=0,COS=1,LCOSV=1,LCOSD=1,CCT=" ",DESTNO=0, PROTVAR=CORNV33,SEGMENT=1,TCHARG=N,SUPPRESS=0,TRACOUNT=31, SATCOUNT=MANY,NNO=604,ALARMNO=0,FIDX=1,CARRIER=1, ZONE=EMPTY,FWDX=1,DEV=VCCONN,TGRP=101,SRCHMODE=ASC, BCHAN=1&&7,BCNEG=Y,BCGR=1,INS=N,LWPAR=8;