hi prof,
1/ it means that the DOWNLINK PC is disabled on ALL the 8 timeslots of the BCCH TRX. The principle is that the BCCH frequency in DL should always be emitted at max power.
2/ it will transmit dummy data at max power (btw, DL DTX is disabled on BCCH TRX as well, for the same reason)
3/ yes, UL PC works the same on all TRX.
Cheers,
pix