Paradise Datacom P300 Series Installation & Operating Handbook page 63

TS16 contains CAS and by implication a terrestrial multiframe in order to carry
the CAS. If selected, the terrestrial multiframe will be acquired, and CAS
removed from/replaced into the Drop/Insert bearer. The CAS will be conveyed
transparently from end to end of the link within IBS (or custom IBS) overheads.
For & bearer operation (with the Extended D/I feature available):
Change, Tx/Rx, Baseband, Drop/Insert, RBS Menu
Robbed Bit Signalling (RBS) is not in operation, or can be ignored.
Robbed Bit Signalling (RBS) is in use with the least significant bit of each
timeslot being used for signalling in frames 6 & 12 (D4) or 6, 12, 18, 24 (ESF)
of the terrestrial multiframe. When this option is selected the Drop/Insert data is
treated specially, and is placed into the bearer by the insert mux in the same
frames from which it came. It is still possible to drop from and insert into
different timeslots, it is simply that the frames of data containing the RBS are
replaced into the same relative positions within the terrestrial multiframe by the
insert mux, in order to preserve the RBS.
P300H P300 Series Modem Installation and Operating Handbook
T1 RBS over satellite: [?]
1=Normal (or no RBS) 2=Maintain RBS
Page 63