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Thundering roars from a spacecraft being propelled from

its launch pad. . . cheering onlookers nudging into the

scene of yet another bit of history . . . dramatic voice

transmissions between earth and "beyond the horizon."

Foreword

All of these events still occur, but the emphasis at NASA today is more and

more toward the efficient and "reusable" application of limited experimentation

time in space after the delivery system has done its job.

One exciting project is Spacelab, a series of exacting missions designed

to provide extensive knowledge of near and deep space.

Housed onboard the Space Shuttle Orbiter, a single Spacelab mission

may feature many varied scientific experiments. Voluminous data streams result,

requiring an adaptable, reliable facility to accept and process them. The Spacelab

Data Processing Facility (SLDPF), at the Goddard Space Flight Center (GSFC),

has been developed to handle the payload data from Spacelab missions.

Furthermore, the SLDPF capabilities are not limited to Spacelab; the SLDPF

can also support attached Shuttle payloads utilizing the Spacelab onboard

data system.

NASA prepared this publication to highlight the capabilities of the SLDPF -

the capturing, quality monitoring, processing, accounting, and forwarding of

vital Spacelab data to various user facilities around the world.
Concept

Flexibility, reliability, reusability . . . these are the advantages the Spacelab

Data Processing Facility (SLDPF) offers to a user seeking to process space data.

Whether an onboard Spacelab experiment belongs to a space particles

investigator in Japan or to a microwave remote-sensing experimenter in Germany,

the SLDPF flexibility is shown by its ability to capture and record a wide

variety of data types (digital, audio, and analog) as required to support an

experiment.

The flexibility of the SLDPF is further demonstrated by the wide range of data

rates that can be handled. K-band channels 2 and 3 digital data are captured

by the SLDPF at a rate of up to 2 megabits per second (Mbps) for channel 2

and at a rate of 2 to 50 Mbps for channel 3. Analog data are also captured by

the SLDPF, at a rate of 4.2 Megahertz (MHz), for an early Spacelab mission.

To implement this flexibility, the SLDPF is divided into two major functional

elements — the Spacelab Input Processing System (SIPS) and the Spacelab

Output Processing System (SOPS). After capturing the digital telemetry data

stream, the SIPS demultiplexes, synchronizes, time tags, quality checks, accounts

for the data, and formats the data onto computer-compatible tapes (CCTs).

For further processing, the digital data are then transferred to the SOPS

where they are edited, time ordered, quality checked, blocked, formatted for

distribution, and recorded onto tapes for shipment to the user. Throughout

this processing, data accountability is maintained by the SOPS. Audio and analog

data products, which are generated in the SIPS, are output directly to the users.

When specifically requested by the user, selected digital tape products may also

be obtained from the SIPS.

Reliability has been incorporated into the SLDPF design. If any part of the

SIPS online components becomes inoperable, a second system provides

redundancy.

The Shuttle reusable concept is also reflected in the SLDPF. To ensure

reusability of the SLDPF, input data stream characteristics and output data

format requirements are not "hard coded" within the system. For example, the

SIPS hardware is programmable during the mission for varying predefined

input data stream characteristics. The SLDPF configuration utilizes parameter

files that adapt the SIPS and SOPS software and hardware to the specific data

processing requirements of each mission. Thus, the SLDPF is reusable from

Spacelab mission to mission, as well as for other projects in the space program

utilizing the Spacelab onboard data system.
The Spacelab Data Network

The Spacelab data network begins with the onboard Spacelab High-Rate

Multiplexer (HRM), which gathers data for transmission to the Tracking and

Data Relay Satellite System (TDRSS) through the Shuttle Orbiter K-band signal

processor. The TDRSS/Domsat link then relays the data to GSFC. Here the

data are captured and processed within the SLDPF before distribution to the users.

The SLDPF Interfaces

In fulfilling overall system requirements, the SLDPF interfaces with other

NASA centers — the Marshall Space Flight Center (MSFC), the Johnson Space

Center (JSC), and the Kennedy Space Center (KSC). For prelaunch verification,

the KSC provides test data for SLDPF premission processing and shipment

to the users. The MSFC, which has mission management responsibilities for

the early Spacelab missions, levies project requirements upon the SLDPF and

supplies premission products essential to mission specific support. The JSC

and the MSFC coordinate real time mission support that includes data quality

monitoring and updating of the nominal timeline. After the mission is completed,

the JSC also supplies Spacelab and Orbiter ancillary data to the SLDPF.
The Spacelab Data Network

EXPERIMENT 1 EXPERIMENT 2 . EXPERIMENT N

TRACKING AND DATA RELAY SATELLITE

CHANNEL 1—19 2 kbps

CHANNEL 2 — UP TO 2 Mbps

CHANNEL 3 — ANALOG (UP TO 4.2 MHz)

DIGITAL (2 TO 50 Mbps)

WHITE SANDS GROUND

TERMINAL

NASA GROUND TERMINAL

SCHEDULES

Spacelab High-Rate

Multiplexer

• Multiplexes experiment data

• Links with Orbiter K-band

signal processor for

transmission from Spacelab

• Records on high data rate and

analog recorders if link is not

available

TORS

• Receives signals from

Shuttle/Spacelab

• Transmits signals to TDRSS

receiver at White Sands

White Sands

• Receives signals from TDRSs

• Operates and controls TDRSS

• Provides short-term recording

of Spacelab data
DOMESTIC SATELLITE

JOHNSON SPACE CENTER

• MISSION CONTROL CENTER

• PAYLOAD OPERATIONS

CONTROL CENTER (POCC)

DATA QUALITY V jiMHURING

PLANNING/COORDINATION

SCHEDULING

GODDARD SPACE FLIGHT CENTER

NETWORK CONTROL CENTER

TRACKING AND DATA RELAY SATELLITE

SYSTEM PROJECT OFFICE

NASA COMMUNICATIONS (NASCOM)

SPACELAB DATA PROCESSING

FACILITY

USER 2

USER N

¥

T

DOM SAT JSC GSFC

Receives signals from White

Sands

Transmits signals to Goddard

Space Flight Center and

Johnson Space Center

Operates and controls the

mission

Schedules data transmissions

in conjunction with Network

Control Center and TDRSS/

NASCOM management

• Receives signals from TDRSS

and Domsat through NASCOM

• Coordinates network activities

• Captures, quality monitors,

accounts for, and processes

data for shipment to users

• Ships data tapes to user

community
SLDPF Interfaces

PREMISSION

INTEGRATION

TEST DATA

(HIGH-DENSITY TAPES)

MISSION MANAGEMENT

MSFC

Q

PREMISSION I

TIMELINE j

HRDM

FORMAT

REQUIREMENTS

SLDPF

MANAGEMENT

(CODE 560)

SIPS

DATA CAPTURE

DEMULTIPLEXING

DATA QUALITY

MONITORING

DATA ACCOUNTING

REAL-TIME

TIMELINE/DATA

QUALITY STATUS

SLDPF

Q

PREMISSION

I/O DATA BASE

• UNEDITE

o

D DIGITAL

• QUALITY &

ACCOUNTING

SOPS

EDITING/FORMATTING

TIME ORDERING &

OVERLAP REMOVAL

I/O DECOM

ANCILLARY PROCESSING

DATA ACCOUNTING

Q

Q

USER TAPES

• EXPERIMENT

• COMPUTER I/O

• ANCILLARY

USER TAPES

• UNEDITED DIGITAL

• QUALITY & ACCOUNTING

• NONDIGITAL Q

JSC/POCC

POSTMISSION

• POSTFLIGHT ATTITUDE &

TRAJECTORY HISTORY

• ORBITER ANCILLARY
The SLDPF consists of two primary computing facilities, the SIPS and the

SOPS. The SLDPF Management within GSFC (Code 560) coordinates all

external interfaces and mission data processing requirements. To perform its

functions, the SLDPF has the following interfaces:

Marshall Space Flight Center/Mission Management

- Provides the mission requirements for the SLDPF

- Provides premission timeline and High-Rate Demultiplexer (HRDM)

format tapes

- Provides premission I/O data base tape

Johnson Space Center/

Payload Operations Control Center

— Provides timeline updates during the mission

— Coordinates real-time data quality status monitoring with the SIPS

— Provides postmission Spacelab Postflight Attitude and Trajectory History

(PATH) and Orbiter Ancillary (OANC) data

Kennedy Space Center

- Provides experiment integration Level IV test data (high-density tapes) for

premission testing and user product verification

- Provides integration Level III, II, and I test data for prelaunch verification

Goddard Space Flight Center/

Communications and Control Management

- Provides data link for K-band channels 2 and 3 data through NASA

Communications (NASCOM)

- Provides supporting communication links through NASCOM

— Coordinates network activities through the Network Control Center (NCC)
Utilizing the SLDPF

What Are the User Requirements?

For full processing, the experiment data format must be compatible with

the High-Rate Multiplexer (HRM). The HRM standards are contained in the

Spacelab HRM Format Standards document (see Additional Reading list). If the

experiment data format does not completely adhere to the HRM standards,

limited processing of the data may still be available within the SLDPF.

Data rates must fall within a threshold acceptable to the HRM; data rates

must be within 16 Mbps for dedicated channels and within 50 Mbps for a

direct access channel.

What Are the Project Requirements?

The mission manager must provide the following to the SLDPF:

- Mission specific parameters

- HRDM format tape

- Premission timeline tapes

- I/O data base tape

- Premission test tapes

— System mission unique requirements (if any).
What Will the SLDPF Provide?

AUDIO Audio Tape — Contains selected voice data from the three voice

channels for periods requested by the users.

ANALOG Analog Tape— Contains Verification Flight Instrumentation or filtered

analog data for Spacelab-1.

IDT Instrumentation Data Tape — Contains selected HRDM output channels

along with Spacelab Coordinated Universal Time.

HOT High-Density Tape — Contains the raw-captured K-band channels 2

and/or 3 data.

SEDT Spacelab Experiment Data Tape — Contains blocked and unedited,

demultiplexed channel data from one or more dedicated experiment

channels.

SIDT Spacelab I/O Data Tape— Contains blocked and unedited,

demultiplexed Experiment Computer (EC) I/O and Subsystem Computer

(SC) I/O channel data.

SQAT Spacelab Quality Control and Accounting Tape — Contains quality and

accounting information for specified SEDT and/or SIDT files.

SECT Spacelab Experiment Channel Tape — Contains edited and formatted

data from one dedicated experiment channel.

SICT Spacelab I/O Channel Tape — Contains selected decommutated words

from the EC I/O and SC I/O channels edited and formatted for

individual experimenters.

SANC Spacelab Ancillary Data Tape — Contains decommutated guidance,

navigation, and control (GNEfC) words from EC I/O channel with related

ancillary parameters. Also contains decommutated and converted

housekeeping parameters from the EC I/O and the SC I/O channels.

SPMA Spacelab Postmission Ancillary Tape — Contains SANC data that have

been merged with PATH data received from the JSC.

OANC Orbiter Ancillary Tape — Contains K-band channel 1 ancillary data from

the JSC. OANC tapes are copied and distributed to the users.
Product Summary and Delivery Schedule

SIPS PRODUCTS

SEDT/SIDT121

SOAT121

IDT121

CAPTURED HDTs'21

AUDIO

ANALOG

SOPS PRODUCTS

SECT

SICT

SANC

SPMA

OANC COPIES

TAPE CHARACTERISTICS

STANDARD

6250-BPI. 9-TRACK

6250- BPI. 9-TRACK

Vi". 7-TRACK

1". 28-TRACK

AUDIO CASSETTES

7-TRACK

1600- BPI. 9-TRACK

1600-BPI. 9-TRACK

1600-BPI. 9-TRACK

1600-BPI. 9-TRACK

1600-BPI. 9-TRACK

OPTIONS

16OO-BPI. 9-TRACK

1600-BPI, 9-TRACK

NONE

NONE

EDITED COPIES OF 1

AUDIO MASTERS >

NONE

800-BPI. 6250 BPI. 9-TRACK

800- BPI. 6250 BPI. 9-TRACK

800-BPI. 6250 BPI. 9-TRACK J

800-BPI, 6250 BPI, 9-TRACK

8OO-BPI. 6250 BPI. 9-TRACK

DELIVERY SCHEDULE11'

SLDPF DATA RECEIPT -1- 1 MONTH

SLDPF DATA RECEIPT + 1 MONTH

SLDPF DATA RECEIPT + 2 MONTHS

PATH RECEIPT + 1 MONTH BUT NO

EARLIER THAN 1 MONTH AFTER SANC

PROCESSING

RECEIPT OF OANC DATA -1- 1 MONTH

Notes:

1

 Delivery schedules are based on a 7-day mission average data rate of 1 Mbps

for the SIPS and 500 Kbps for the SOPS. Delivery schedules for missions

with higher rates must be negotiated.

2

Tapes generated by the SOPS are the standard SLDPF digital products.

Experimenters not conforming to standard HRM data formats or desiring earlier

receipt of data may negotiate with the SLDPF for shipment of SEDTs, SIDTs,

SQATs, IDTs, and/or captured HDTs.

'
SLDPF Overall Processing Flow

SIPS Phase 1

During the SIPS Phase 1 processing, K-band channel 2 and/or channel 3

data are captured onto high-density tapes. During the mission, the primary

SIPS functions are the real time capture and quality monitoring of the data.

The SIPS System Engineering Laboratories (SEL) 32/77 computers may perform

digital processing in real time for those HRDM output channels whose aggregate

data rate does not exceed the SIPS capability. Analog data from K-band

channel 3 are also captured in real-time. After real-time data capture, the

HDTs, including playback and direct access channel data, are postprocessed

to produce SEDTs and/or SIDTs. During this phase, audio data are captured,

and later edited and copied onto audio cassette tapes.

SIPS Phase 2

During the SIPS Phase 2 processing, the completed SEDTs and/or SIDTs are

grouped, quality analyzed, and accounted for prior to release to the SOPS.

The SQATs are generated at this time containing quality and accounting

information corresponding to the SEDT and/or SIDT files to be released.

Copies of the SEDTs, SIDTs, and SQATs for users other than the SOPS are also

generated during this phase. In addition, shipping letters for all SIPS products

are generated.

SOPS Phase

During the SOPS phase, the digital data contained on the SEDTs and SIDTs

are further processed to produce experiment channel tapes, I/O channel tapes,

and Spacelab ancillary tapes. The OANC copies are provided for shipment to the

users. The major processing functions within the SOPS include time ordering,

overlap removal, major frame editing, decommutating from the I/O channels,

ancillary processing, and formatting and generating output products. All

products distributed by the SOPS are accounted for and are accompanied by

shipping information.

11
SLDPF Overall Processing Flow

CHANNEL 2 OR 3

REAL TIME SIPS PROCESSING PHASE 1

DIGiTAL

CHANNEL 3

ANALOG

ANALOG

CAPTURED DATA

HOT

—

EL 2 OR 3

JRE ONLY s

HOT

POSTPROCESSING

HOT

HDRR/

[ PLR

HRDM

FSS

HIT

SEL

32/77

ACCOUNTING FILE

SEDT

SIDT

UNEDITED

DIGITAL DATA I 

I

IDT

12
SIPS PROCESSING PHASE 2 (RELEASE) SOPS PROCESSING PHASE

COPIES

SQAT

nr

)

TAPE STAGING AND STORAGE CENTER

SHIPMENT

TO

USERS

• • • TIT

SECT

PATH OANC

UNI VAC

1100/82

PROCESSED DIGITAL

SICT

DATA

SANC SPMA

OANC

COPIES

13
Spacelab/Orbiter Data Flow

LOW RATE

EXPERIMENT DATA

ANCILLARY DATA

ANALOG/VIDEO

SPACELAB

EXP/SUBSYSTEM

COMPUTER DATA

CHANNEL 1

DIGITAL

96 OR 192 Kbps

CHANNEL 2

DIGITAL

2 Mbps WAX

CHANNEL 3

DIGITAL

50 Mbps MAX OR

ANALOG/VIDEO

4-2 MHz MAX

14
High-Rate Multiplexer (HRM)

The asynchronous multiplexer collects various input data streams and

multiplexes the data into a composite signal of up to 48 Mbps. Data can be

formatted into any of 64 predefined formats.

A direct access channel bypasses the HRM functions internally and provides

a 50-Mbps downlink capability for a given experiment.

High Data Rate Recorder (HDRR)

Composite data are recorded on the HDRR onboard the Spacelab at rates of

up to 32 Mbps during time intervals without TDRSS coverage. The HDRR is

played back in reverse and can be multiplexed with real-time data in the

composite data stream — this results in a second level of multiplexing.

Pay load Recorder (PLR)

The Orbiter PLR serves primarily as a backup to the Spacelab HDRR.

Data can be recorded at a rate of up to 1 Mbps.

K Band Signal Processor

The K-band signal processor collects the composite data stream, the analog

or video data stream, and the network signal processor output. These various

data streams are selected for downlinking over channels 1, 2, or 3.

Analog/Video (A/V) Recorders

There are two onboard A/V recorders onto which data are captured during

time intervals without TDRSS coverage.

15
SIPS Hardware Configuration

CHANNEL 3 ANALOG

HRDM A VOICE

HRDM B VOICE

TYPICAL DATA PATH

16
The SIPS consists of redundant special-purpose hardware and SEL 32/77

computers which share five high-density recorders. This redundancy ensures

real-time processing capabilities. Audio and analog recording subsystems are

also included.

High-Rate Demultiplexer (HRDM)-Two Units

Each unit can receive a composite data stream from the NASCOM network

or from an HOT. The HRDM performs the inverse function of the HRM and

separates the composite stream into the original data signals that were multiplexed

onboard the Spacelab. The HRDM is programmable and is indirectly controlled

by the SEL

HRDM Interface Controller and

Time Code Converter (HIT)-Two Units

Each unit interfaces the HRDM and the SEL to load the HRDM formats and

to monitor the HRDM status. The HIT also converts the HRDM time codes for

time tagging the digital data.

Frame Synchronizer Subsystem (FSS) -

Two Subsystems

Each FSS consists of 23 Frame Synchronizer Units (FSUs) that accept and

synchronize serial data from the HRDM, from the composite stream, or from

the HOT read after write. Each FSS passes time tagged data and/or status

to the SEL.

Audio Recording and Monitoring Subsystem (ARMS)

This specially designed system accepts the three incoming analog voice

channels output from the HRDM. The ARMS will time edit the audio and make

user cassette recordings upon request.

Patch/Configuration Manager's Console (CMC)

This console, which interfaces with the SEL, monitors the setup and status

of the SIPS hardware and provides signal-patching capabilities.

SEL 32/77 Computers- Two Systems

The salient functions performed by each SEL are configuration and timeline

control, HRDM format loading, data input, quality assessment, accounting,

formatting, and tape generation.

1 /
SIPS Functions

— Capture all digital data in real time on HDTs.

— Record the analog data stream in real time.

— Perform data quality monitoring in real time on the composite and

demultiplexed data streams.

— Coordinate with the POCC in real time during the mission for data quality

monitoring and timeline updates.

— Coordinate with NASCOM.

- Demultiplex the output of the HRM

- Transfer demultiplexed experiment and I/O channels to the SEL 32/77

— Record the audio data from the HRDM

— Record data from selected HRDM channels on IDTs.

- Format and output the demultiplexed dedicated experiment channel data

to SEDTs.

— Format and output the demultiplexed experiment computer I/O channel and

the subsystem computer I/O channel data to SIDTs.

- Postprocess playback data (HDRR/PLR)

- Reverse the HOT

- Demultiplex the playback stream and generate output products.

- Postprocess any channel 2 and/or channel 3 captured data not processed in

real time.

— Postprocess direct access channel (DAC) data.

— Perform quality assurance (QA) and accounting procedures prior to shipping.

— Generate shipping letters for all user tapes.

18
Spacelab Input Processing System

PREMISSION

FROM MSFC

PREMISSION

FROM MSFC

JOHNSON SPACE

CENTER

PAYLOAD

OPERATIONS

CONTROL CENTER

TO USERS

EXPERIMENT

DATA

I/O

DATA

QUALITY AND

ACCOUNTING

DATA

*TO USER ON

SPECIAL REQUEST

19
SOPS Functions

— Edit the data.

— Time order the data.

— Remove data overlap.

— Format the experiment data onto individual experiment channel tapes (SECTs).

— Decommutate the I/O data.

— Format the decommutated I/O data onto individual I/O channel tapes (SICTs).

- Produce attitude and ephemeris translations from raw GN&C parameters

contained in the EC I/O data.

— Convert selected payload ancillary data downlinked on channel 2 and channel

3 to engineering units.

— Generate ancillary tapes in standard format containing both converted GN&C

and other ancillary data (SANCs).

- Perform quality assurance (QA) and accounting procedures before shipping.

- Merge PATH and previously generated SANC data to generate postmission

ancillary data (SPMAs).

- Process (copy) OANC data.

— Generate shipping letters for all user tapes.
Spacelab Output Processing System

PREMISSION

FROM MSFC

POSTMISSION POSTMISSION

FROM JSC FROM JSC

PREMISSION

FROM MSFC

FROM

SIPS

TO USERS

21
Postmission Reprocessing Requests

SLDPF

MANAGEMENT

(GSFC CODE 56O)

SLDPF DATA

OPERATIONS

TO USER

User requests for reprocessing are submitted to the GSFC Information

Processing Division (Code 560). Copies of the requests are also submitted to

the Mission Manager (at the MSFC for early Spacelab missions).

User Recopy Requests . . .

The entire tape is recopied if physical tape problems occur after release

from GSFC. Tapes lost in shipment would also fall into this category of

reprocessing requests.

User Redo Requests . . .

The original source tapes are used to regenerate data when the user

expects the data quality to improve by reprocessing the suspect data.

Spacelab master tapes are archived for 12 months after a mission to

ensure that all recopy and redo requests can be fulfilled.

22

I

I
Summary

The SLDPF mirrors the "reusable concept" of the Space Shuttle— input

data stream characteristics and output data formats can be varied within the

system from mission to mission to ensure a reusable support facility. Parameter

files are utilized to adapt the SIPS and SOPS software and hardware to the

specific data processing requirements of each user being supported during a

given mission.

The SIPS and SOPS are the two major components of the SLDPF. The

SIPS captures digital, audio, and analog data. After capturing the digital data,

the SIPS demultiplexes, synchronizes, time tags, quality checks, accounts for,

and formats the data onto computer-compatible tapes. For further processing

the digital data are then transferred to the SOPS where the SLDPF digital

processing is completed. The SOPS edits, time orders, blocks, quality checks,

formats for distribution, and records the data on tape for shipment to the users.

In addition, the SOPS provides the SLDPF ancillary processing and accounts for

the SOPS generated data products.

To take advantage of the SLDPF capabilities, the user's experiment must be

compatible with the HRM onboard the Spacelab. Data rates must be within 16

Mbps for a dedicated channel and within 50 Mbps for a direct access channel

to be acceptable for processing within the SLDPF. For each experiment proposed

for a Spacelab mission, the user must provide the SLDPF with certain specific

information through the mission manager. The mission manager provides this

information to the SLDPF via the data processing requirements document, the

HRDM format tape, the premission timeline tapes, and the I/O data base tape.

The SLDPF will provide to the user, as applicable, the following: computercompatible tapes, audio tapes, analog tapes, high-density tapes, instrumentation

data tapes, and related reports/shipping letters.

23
Additional Reading

1. George C. Marshall Space Flight Center, Spacelab High Rate Multiplexer

Format Standards for Missions 1, 2, and 3. MSFC-STD-630, Marshall Space

Flight Center, Alabama 35812, April 1978.

2. --, Spacelab Payload Mission 1 Spacelab Data Processing Facility Requirements

Document. JA-015 Revision A, Marshall Space Flight Center, Alabama

35812, October 1982.

3. Computer Sciences Corporation (CSC), SLDPFBaseline Requirements Document.

CSC/SD-80/6027 UD3, GSFC, Greenbelt, Maryland 20771, October 1982.

4. --, Interface Control Document for Spacelab Instrumentation Data Tapes

(IDTs). CSC/SD-80/6119 UD1, GSFC, Greenbelt, Maryland 20771, October

1981.

5. --, Interface Control Document for Spacelab Input/Output Data Computer

Compatible Tapes (SIDTs). CSC/SD-79/6122 UD6, GSFC, Greenbelt,

Maryland 20771, January 1983.

6. --, Interface Control Document for Spacelab Experiment Data ComputerCompatible Tapes (SEDTs). CSC/SD-79/61 21 UD6, GSFC, Greenbelt,

Maryland 20771, January 1983.

7. --, Interface Control Document for Spacelab Mission-1 Analog Data Tapes

(ANDTs). CSC/SD-82/6027, GSFC, Greenbelt, Maryland 20771, March 1982.

8. --, Interface Control Document for Spacelab Master Audio Tapes (MATs) and

Audio Cassette Tapes (ACTs). CSC/SD-8176006 UD2, GSFC, Greenbelt,

Maryland 20771, April 1982.

9. --, Interface Control Document for Spacelab Input/Output Channel Tapes

(SICTs). CSC/SD-80/622 UD3, GSFC, Greenbelt. Maryland 20771,

August 1983.

10. --, Interface Control Document for Spacelab Experiment Channel Tapes

(SECTsj. CSC/SD-80/6222 UD3, GSFC, Greenbelt, Maryland 20771,

August 1 983.

11. —, Interface Control Document for Spacelab Ancillary Data Tapes (SANCs),

CSC/SD-80/6216 Revision 1 UD1, GSFC, Greenbelt, Maryland 20771,

August 1983.

1 2. --, Interface Control Document for Spacelab Quality Control and Accounting

Data Computer-Compatible Tapes (SQATs). CSC/SD-79/61 23 UD6, GSFC

Greenbelt, Maryland 20771, January 1983.

13. --, Interface Control Document for Spacelab Post Mission Ancillary Data

Tapes (SPMAsj. GSFC, Greenbelt, Maryland 20771, to be issued summer of

1983.

24
Glossary

ARMS Audio Recording and

Monitoring Subsystem

A/V Analog/Video

BPI Bits Per Inch

CCT Computer-Compatible Tape

CCTV Closed-Circuit Television

CMC Configuration Manager's

Console

DAC Direct Access Channel

DEMUX Demultiplexed

Domsat Domestic Satellite

EC Experiment Computer

FSS Frame Synchronizer Subsystem

FSU Frame Synchronizer Unit

GN&C Guidance, Navigation, and

Control

GSFC Goddard Space Flight Center

HDRR High Data Rate Recorder

HOT High-Density Tape

HIT HRDM Interface Controller

and Time Code Converter

HRDM High-Rate Demultiplexer

HRM High-Rate Multiplexer

IDT Instrumentation Data Tape

I/O Input/Output

JSC Johnson Space Center

Kbps Kilobits per second

KSC Kennedy Space Center

Mbps Megabits per second

MHz Megahertz

MSFC Marshall Space Flight Center

NASA National Aeronautics and

Space Administration

NASCOM NASA Communications

NCC Network Control Center

OANC Orbiter Ancillary

PATH Postflight Attitude and

Trajectory History

PCM Pulse-Code Modulation

PLR Payload Recorder

POCC Payload Operations Control Center

PB Playback

QA Quality Assurance

RT Real Time

SANC Spacelab Ancillary Data Tape

Subsystem Computer

Spacelab Experiment Channel Tape

SEDT Spacelab Experiment Data Tape

SICT Spacelab I/O Channel Tape

SIDT Spacelab I/O Data Tape

Spacelab Input Processing System

SEL Systems Engineering Laboratories

SL Spacelab

SLDPF Spacelab Data Processing Facility

SOPS Spacelab Output Processing System

SPMA Spacelab Postmission Ancillary Tape

SQAT Spacelab Quality Control and

Accounting Tape

TDRS Tracking and Data Relay Satellite

TDRSS Tracking and Data Relay Satellite

System

VFI Verification Flight Instrumentation
NASA

National Aeronautics and

Space Administration

Information Processing Division, Code 560

Mission and Data Operations Directorate

Goddard Space Flight Center

Greenbelt, Maryland 20771

(301) 344-6124