CAPS Data Products Definition Rev. 8/10/2001

The following data products are generated once each A–cycle (32 s).

IBS and ELS: Each table entry indicates the number of data products generated in each category. The 16 kbps entry always contains the maximum number of products available in a data category (listed in the column headings). Where this number is smaller than the 16 kbps entry, the data have been AVERAGED over adjacent channels and the entry indicates the resulting number of products. Multiplying adjacent entries in a given row gives the number of products (or bytes) in a particular mode (last column). Many of the data products formerly listed under “snapshot” are in fact collapsed products and are now listed that way.

IMS SINGLES, LOGICALS, and ION data products are generated according to the same rules as IBS and ELS---all data entries represent averages taken over adjacent channels.

IMS EN x TOF data products are formed differently. The TOF data products are AVERAGED over adjacent TOF channels. This is shown explicitly in the TOF table. Energy spectra collapses across TOF channels, on the other hand, are SUMMATIONS rather than averages.

Note that (*) indicates the definition of a telemetry mode implemented in the new flight software for ICO2 and Jupiter and (**) indicates the definition of telemetry modes currently in use (2/25/00).

IMS TDC SINGLES

Logical Data Rate	___ Snapshot_________ E EL AZ			___ Collapse________ E EL AZ			Bytes / A- cycle
16**	63	8	8	---	---	---	4032
2**				16	4	2	128
1*	---	---	---	---	---	---	0
0.5*	---	---	---	---	---	---	0
0.25*	---	---	---	---	---	---	0

(**) indicates current definition; (*) indicates planned modes and definitions for new FSW load:

(***) AZ=3 indicates an average over 3, 3, and 2 adjacent energy spectra.

IMS TDC LOGICALS

Logical Data Rate	_ Snapshot________ E LOG AZ			____ Collapse_________ E LOG AZ			Bytes A- cycle
16**	63	4	8	---	---	---	2016
2**				16	4	2	128
1*	---	---	---	---	---	---	0
0.5*	---	---	---	---	---	---	0
0.25*	---	---	---	---	---	---	0

(**) indicates current definition; (*) indicates planned modes and definitions for new FSW load

IMS ION

Logical Data Rate	___ Snapshot_________ E EL AZ ION				_________Collapse_________ E EL AZ ION				Bytes / A – cycle
16**	63	8	8	7	---	---	---	---	28224
2**					63	4	2	6	3024
1*					32	4	1	2***	256
0.5*					32	4	1	2***	256
0.25*					32	4	1	2***	256

(*) Indicates mode definitions for new FSW load. (**) Indicates current definition.

(***) The 2 IONs are H+ST & He2+ST.

IMS TOF

Logical Data Rate	_ LEF _ _ E TOF Bytes			___ST_________ E TOF Bytes			Bytes / A - cycle	A - cycles/ B - cycle
16**	4(S2)	512	2	4(S2)	512	2	8192	8
2**	2(S2)	256(A2)	2	2(S2)	256	2	2048	16
1*	1(S2)	256(A2)	2	1(S2)	256	2	1024	32
0.5*	1(S2)	256(A2)	2	1(S2)	256	2	1024	32
0.25*	1(S2)	64(A8)	2	1(S2)	64	2	256	32

(**) indicates current definition; (*) indicates planned modes and definitions for new FSW load

Note: Complete E x TOF spectra (32E x 512 TOF) require 1 B – cycle.

ELS

Logical Data Rate	_ Snapshot______ E EL AZ			_____ Collapse_______ E EL AZ			Bytes / A- cycle
16**	63	8	16	---	---	---	8064
2-SW*	8	8	16	63	8	1	1528
2-MAG*	---	---	---	63	8	4	2016
1*	---	---	---	63	8	3***	1512
0.5-SW*	---	---	---	32	8	1	256
0.5-MAG*	---	---	---	63	8	1	504
0.25*	---	---	---	32	8	1	256

(*) indicates planned modes and definitions for new FSW load; (**) indicates current definition;

(***)the AZ = 3 option indicates that the data products are averages over 5, 5, and 6 AZ channels

IBS

Logical Data Rate	__ Snapshot_ __ E EL AZ			Collapse____ E EL AZ			Bytes / A – cycle
16**	255	3	16	---	---	---	12240
2-SW*	---	---	---	255	3	1	765
2-MAG*	---	---	---	128	3	1	384
1*	---	---	---	255	3	1	765
0.5-SW*	---	---	---	128	1	1	128
0.5-MAG*	---	---	---	---	---	---	0
0.25*	---	---	---	---	---	---	0

(**) indicates current definition; (*) indicates planned modes and definitions for new FSW load

SUMMARY (Bytes/ A – cycle)

	Data Products			Logical Data Rate_____ _ _ 16** 2SW* 2MAG* 1* 0.5MAG* 0.5SW* 0.25*
IMS TDC SING		4032	128		128	0	0	0	0
IMS TDC LOG		2016	128		128	0	0	0	0
IMS ION		28224	3024		3024	256	256	256	256
IMS TOF LEF		4096	1024		1024	512	512	512	128
IMS TOF ST		4096	1024		1024	512	512	512	128
ELS		8064	1528		2016	1512	504	256	256
IBS		12240	765		384	765	0	128	0
Science Total		62768	7621		7728	3557	1784	1664	768
Data Overhead (dpid & sync)		14	14		14	10	8	10	8
ACT		68	0		0	0	0	0	0
A- cyc. Hdr.		24	24		24	24	24	24	24
HK		168	88		88	88	88	88	88
Check Sum		14	14		14	10	8	10	8
Science + CAPS overhead		63056	7761		7868	3689	1912	1796	896
CCSDS overhead		768	96		96	48	24	24	12
Subtotal		63824	7857		7964	3737	1936	1820	908
Spare		176	143		36	263	64	180	92
Total		64000	8000		8000	4000	2000	2000	1000

(*) indicates planned new modes; (**) indicates modes implemented

CCSDS overhead = ( truncate[(Science + CAPS overhead) / 988] + 1) * 12

Percentage Data Allocation by Sensor

Data Products	_ Logical Data Rate ___________ 16** 2SW* 2MAG* 1* 0.5MAG* 0.5SW* 0.25*
IMS		66.35	66.60	66.60	32.00	64.00	64.00	51.20
ELS		12.60	19.10	25.20	37.80	25.20	12.80	25.60
IBS		19.13	9.56	4.80	19.13	0.00	6.40	0.00
OH + HK + CCSDS		1.65	2.95	2.95	6.58	7.60	7.80	14.00
Spare		0.28	1.79	0.45	4.50	3.20	9.00	9.20