Premier Mounts CDM-600 IBS Clock/data recovery and De-jitter, IBS Framing, IBS Scrambling

CDM-600 Satellite Modem	Revision 7
Open Network Operations	MN/CDM600.IOM

9.2.1IBS Clock/data recovery and De-jitter

Performs clock and data recovery on the G.703 format. Clock de-jitter and data encoding/decoding is done as with the IDR configuration.

9.2.2IBS Framing

Multiplexes/demultiplexes the primary data in compliance with the standard IESS-309 overhead ratio of 1/15 (4 overhead bytes per 60 data bytes) and provides the rate exchanged transmit clock to the modulator portion of the base modem.

9.2.3IBS Engineering Service Channel

Bi-directional processing of the components of the ESC channel, including the ASYNC or SYNC EIA-232 data channel, and fault/alarm indications.

For units with FW version 1.3.1 or greater a second high-rate ESC channel, at up to 1/20th of the primary data rate, is available, using async EIA-232 format.

9.2.4IBS Scrambling

Provides the synchronous scrambling/descrambling of the satellite-framed data specified in IESS-309. Base modem scrambling/descrambling is disabled in this mode.

9.3	Drop and Insert
		Primary Data Rates Supported
	G.703, EIA-422, V.35 and		1544 kbps SD, RD, DDO, IDI
	Serial LVDS		2048 kbps SD, RD, DDO, IDI
	Satellite Data Rates Supported		N x 64 kbps
	(all have 16/15 overhead)		N = 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, or 24 (T1)
			N = 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, or 30 (E1-CCS)
			N = 1, 2, 4, 6, 8, 12, 16, 24, 30 (E1-CAS)
	Terrestrial Framing Supported		G.732/G.733, G.704
	Satellite Overhead Rate		16/15 of data rate per IESS-308 Rev. 6 and IESS-309 Rev. 3,
			or higher
	Timeslot Selection Range		1 to 24 (all T1 modes)
			1 to 30 (E1-CAS and E1-CCS)
			Arbitrary order, non-contiguous available
	Plesiochronous Buffer Sizes		Selectable size of 64 to 262,144 bits, in 16-bit steps (with
			added limitations for G.704 frame boundaries)

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