File Non Standard Commanding

     Name:     non standard commanding
     Code:     non_standard_commanding
     Label:     S2.1.39
     Number:     0 (estimated: 913)    

The following note was sent by SCC before delivering Non Standard Commanding, note that Non Standard Commanding is still to be incorporated into the ISO Data Archive:

Villafranca Satellite Tracking Station

Memorandum

ref.: M1197-N05/PMA

Villafranca, November 13, 1997

From     : Pedro J. Schoch

To     : Arno Plug

cc     : Pierre Maigni

Simon O'Leary

Subject: ISO PMA - Non Standard Commanding budget

Non Standard Commanding as defined by Arno is the commanding that is performed by the

INSCONS via their Manual Stack. From a conversation with the INSCON manager, I was told

that the INSCONS only command to the instrument subsystems, which are marked as s/s 6

through 9 in the IDCS. Whenever a command is sent from the IDCS Manual Stack it gets an

associated numbers stamp which tells the IDCS the Manual Stack that was used. The INSCONS

use both Manual Stack number 2 or 3, so in order to filter data from the INSCONS this is not

good. However, data can be filtered through the s/s number.

The filtering of the data can be done from a generated ASCII TCHIST file. This file is not in this

format so it needs a bit of processing. A sample of TCHIST ASCII file is:

TELECOMMAND HISTORY PRINT

Based on the following selection criteria

Start time:     1997.312.11.13.20.000

Duration:     002.00.00.00

Source:           M

Subsystem:     -1

Command type:      A

Type of failure:     A

Once having the ASCII file, it is easy to filter out commands which have gone to s/s 6, 7, 8 and

9. To get the TCHIST ASCII file there are different alternatives, however they are costly because

the raw data must first be recovered into the system. Then, either a tool has to be written or some

IDCS software modified to cope.

The budget is then difficult to arrive at. However, a first estimate budget to generate Non

Standard Commanding ASCII files is presented below:

- Time to generate NSC ASCII files for 800 revs               525 hours (65.6 days)

- Approximate mean file size per revolution (full TCHIST)          40.75Kbytes

- Approximate total size for 800 revs (full TCHIST)               32.6Mbytes

- Approximate mean file size per revolution (filtered TCHIST)     31Kbytes

- Approximate total size for 800 revs (filtered TCHIST)          24.8Mbytes

This budget assumes the following:

- Budget to produce the NSC ASCII Files has to be approved by DPD

- Budget includes any documentation, i.e. tool documentation and procedures

- ISODV is available to perform the necessary activities

- DAT tapes are not damaged

- ASCII files contain the info as shown above and filtered by s/s 6-9

Should you have any more questions, please contact me.

Regards

Pedro J. Schoch

Non Standard Commanding has been delivered by SCC as part of the Event Log. The Event Log will provide a unique means to visualize all messages generated by the IDCS tasks such as the Non Standard Commanding activities (ref. ISO PMA-Event Log description of contents and budget, dated November 12, 1997).

Use and Related Data

A script called get_location.csh will be used to extract Non Standard Commands.

Post Operations

TBD.

Interim

Not applicable.

The following table gives the estimated number of files for each Non Standard Commanding file, the file size, and the resulting total size in KB.