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P300H P300 Series Modem Installation and Operating Handbook Page 60
T1 RBS over satellite: [?]
1=Normal (or no RBS) 2=Maintain RBS
Change, Tx/Rx, Baseband, Drop/Insert, RBS Menu
For T1-D4 & T1-ESF bearer operation (with the Extended D/I feature available):
NORMAL
(OR NO RBS) Robbed Bit Signalling (RBS) is not in operation, or can be ignored.
MAINTAIN RBS 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.