Table 2
Data stream synchronization patterns and their respective interpretations for integers encoded in an overlong form.
| Integer value or range | Interpretation |
|---|---|
| 2-byte overlong 3…31 | consecutive zeros, number of zeros is the value (i.e., between 3 and 31) |
| 2-byte overlong 32…39 | spectrum, bin mode is the value minus 32 (i.e., between 0 and 7) |
| 2-byte overlong 40 | absolute timing, followed by 3 integers: seconds (upper 8 bits and lower 24 bits) and microseconds |
| 2-byte overlong 41 | relative timing, followed by a single integer (microseconds, w.r.t. the previous timestamp) |
| 2-byte overlong 42 | metadata & housekeeping data: index, exposure time in μs, total count, cutoff value, temperatures |
| 2-byte overlong 42…47 | reserved for future housekeeping information and metadata of satellite platform components |
| 2-byte overlong 48…63 | reserved for future synchronization patterns |
| 3-byte overlong 32…255 | consecutive zeros, number of zeros is the value (i.e., between 32 and 255) |
| 4-byte overlong values | unallocated code points, reserved for future use |
| 5-byte overlong values | unallocated code points, reserved for future use |
Notes. All of the overlong code space can also be used for self-synchronization purposes. A portion of the code space is used to encode a longer series of zeros (found in the high-resolution calibration spectra taken in low-background regions), precise absolute timestamps, precise differential timestamps, housekeeping data, metadata associated with the data acquisition parameters, and other types of synchronization patterns.
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