Paradise P300 specifications IBS/SMS Operation with 2048KBPS Continuous Data, Normal No CAS

7.2IBS/SMS OPERATION WITH 2048KBPS CONTINUOUS DATA

7.2.1Change, Tx/Rx, Baseband, Continuous, 2048k G.732 Menu (IBS)

2048kbps IBS/SMS operation is a special case, in which there are two modes of operation. These modes are confusingly referred to as 1920/1984kbps and 2048kbps mode in the IBS/SMS service definitions, but both operate with a 2048kbps terrestrial data rate !

	2048K IBS mode: [?]
	1=Normal (6.7% overhead) 2=G.732 (0% overhead)
	Change, Tx/Rx, Baseband, Continuous, 2048k G.732 Menu
NORMAL	The content of the 2048kbps data is ignored (ie it can be unframed), and the
	normal 6.7% overhead is added bringing the rate to 2184.53kbps. This is referred
	to as 2048kbps operation in the service definitions. If NORMAL is selected then
	the dialogue returns to that covered in the main section of the handbook.
G.732	The data is G.732 formatted data, ie it already contains a terrestrial G.732 frame
	comprising of 32 Timeslots, TS0 to TS31. Although the aggregate data is
	2048kbps, as only 30 or 31 timeslots are available for data (TS0 is framing and
	TS16 may be signalling) the user data rate is 1920 or 1984kbps (30 or 31 x
	64kbps). This is referred to as 1920kbps or 1984kbps operation in the service
	definitions, but the data rate at the terrestrial port is actually 2048kbps !
	When selected instead of the unit inserting extra IBS/SMS framing on to the data
	(ie +6.7%), it uses the similar G.732 framing already present (+0%). Some
	locations in the G.732 framing are changed over satellite (such as TS0 Odd bit
	4 which is used by the IBS/SMS TS32 multiframe word) and so it is not entirely
	transparent to all the overhead. Parts of the overhead unused for frame
	alignment, and also not `borrowed` by IBS/SMS features may be set to be either
	Transparent or Fixed High. This is controlled under Change, User-Opt,
	Operation, Terr/Sat, G.732 Spares.

If G.732 mode is selected the operator is then prompted with:

Channel Assoc Sig (CAS) in TS16: [?]

1=Normal (No CAS) 2=CAS

Change, Tx/Rx, Baseband, Cont', 2048k IBS, G.732 CAS Menu

Channel Associated Signalling (CAS) is described in para 10.2 "Signalling Systems Introduction: CCS, CAS & RBS" on page 210 if required.

NORMAL
(NO CAS)	TS16 does not contain CAS (ie a terrestrial CAS multiframe and `abcd` signalling
	nibbles for each timeslot). It is treated as a normal data timeslot, and this
	corresponds to modes defined as 1984kbps in the service definitions.
CAS	This feature is only available if the Extended D/I feature is available (standard on
	P300-TCM). TS16 contains CAS and by implication a terrestrial multiframe in
	order to carry the CAS (this corresponds to modes defined as 1920kbps in the
	service definitions). 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.

P300H P300 Series Modem Installation and Operating Handbook Page 137