5.37.2.7. Activation/Deactivation of Boards and Circuits 
VCM board and circuit:
The VCM board and circuit can be switched like all other boards and
circuits with the AMOs BSSU and DSSU.
Partner board and circuit:
In case of pre-blocking of a S0/S2 board or S0/S2 circuit the AMOs
BSSU and DSSU check if B-channels are occupied by VC and if so the affected
VCM boards or circuits will be pre-blocked too. During activation the
occupation by VC will be also checked. If the determined VCM boards or
circuits are in a pre-blocked status, they will be activated too.
INFO:
After deactivation of a LTU the status "pre-blocked"
of boards and circuits is lost. In this case the automatically pre-blocked
VCM boards or circuits have to be activated manually.