AS 2750-1985

1 - AS 2750-1985 INFORMATION PROCESSING-9-TRACK, 12.7 MM(0.5 IN) WIDE MAGNETIC TAPE FOR INFORMATION INTERCHANGE-FORMAT AND...
4 - PREFACE
5 - Contents
6 - 1 Scope and field of application
6 - 2 References
6 - 3 Definitions
6 - 3.1 magnetic tape:
6 - 3.2 reference tape:
6 - 3.3 secondary reference tape:
6 - 3.4 signal amplitude reference tape:
6 - 3.5 typical field:
6 - 3.6 reference field:
7 - 3.7 standard reference amplitude
7 - 3.8 reference edge
7 - 3.9 in contact
7 - 3.10 track
7 - 3.11 row
7 - 3.12 position of flux transition
7 - 3.13 physical recording density
7 - 3.14 data density
7 - 3.15 skew
7 - 3.16 ECC character
7 - 3.17 auxiliary CRC character
7 - 3.18 CRC character
7 - 3.19 preamble
7 - 3.20 postamble
7 - 3.21 density identification area (ID burst)
7 - 3.22 Automatic Read Amplification (ARA) burst
7 - 3.23 error
7 - 4 Operating and transportation conditions
7 - 4.1 Operating environment
7 - 4.2 Transportation
7 - 4.3 Wind tension
7 - 5 Recording
7 - 5.1 Method of recording
7 - 5.2 Density of recording
8 - 5.3 Average flux transition spacings
8 - 5.4 Instantaneous flux transition spacings
9 - 5.5 Skew
9 - 5.6 Signal amplitude
9 - 5.6.1 Standard reference amplitude
9 - 5.6.2 Average signal amplitude
9 - 5.6.3 Minimum signal amplitude
9 - 5.7 Erasure
9 - 6 Tracks
9 - 6.1 Number of tracks
9 - 6.2 Track identification
9 - 6.3 Track positions
9 - 6.4 Track width
9 - 7 Data representation
9 - 7.1 7-bit coded characters
9 - 7.2 8-bit coded characters
10 - 8 Data formatting
10 - 8.1 Data groups
10 - 8.2 Residual group
10 - 8.3 CRC group
11 - 8.4 Check characters
11 - 8.4.1 ECC character
11 - 8.4.2 Auxiliary CRC character
12 - 8.4.3 CRC character
12 - 8.4.4 Residual character
12 - 9 Recording of groups on tape
13 - 10 Control sub-groups
13 - 10.1 Terminator control sub-groups (TERM)
13 - 10.2 Second control sub-groups (SEC)
13 - 10.3 Synchronization control sub- group (SYNC)
13 - 10.4 MARK 1 control sub-group
13 - 10.5 MARK 2 control sub-group
13 - 10.6 END MARK sub-group
13 - 11 Storage block
13 - 11.1 Data portion
14 - 11.2 Structure of a block
14 - 11.2.1 Preamble
14 - 11.2.2 MARK 1
14 - 11.2.3 Re-sychronization burst (RESYNC)
14 - 11.2.4 Number N of data stroage groups
14 - 11.2.5 Residual storage group and CRC storage group
14 - 11.2.6 MARK 2
14 - 11.2.7 Postamble
14 - 11.3 Interblock gap
14 - 11.4 Maximum data density
14 - 12 Tape format
14 - 12.1 Density identification area (ID burst)
14 - 12.2 Gap G1
15 - 12.3 Automatic Read Amplification (ARA) Area
15 - 12.3.1 ARA level burst
15 - 12.3.2 Automatic Read Amplification identification (ARA ID burst)
15 - 12.4 Gap G2
15 - 12.5 Tape mark
16 - 13 Interchange criteria
16 - 13.1 Correctable errors
16 - 13.2 Acceptable criteria
16 - 13.3 Elongated interblock gap
17 - Annex A - Transportation
17 - A.2.1 Impact loads and vibrations
17 - A.2.2 Extremes of temperature and humidity
17 - A.2.3 Effects of stray magnetic fields
18 - Annex B - Procedure and equipment for measuring flux transition spacing
18 - B.1 General
18 - B.2 Read equipment
18 - B.2.1 Tape transport
18 - B.2.2 Head
18 - B.2.3 Amplifier-differentiator
19 - B.2.4 Amplifier-limiter
19 - B.2.5 Sinewave generator
19 - B.2.6 Time interval counter
19 - B.3 Procedure and calibration
19 - B.3.1 Procedure
19 - B.3.2 Calibration of the read chain

Specifies a format and recording standard for 9-track, 12.7 mm (0.5 in) magnetic tape to be used for data interchange between information processing systems, communication systems and associated equipment utilizing the Australian standard 7-bit coded character set defined in AS 1776 and AS 1953. Identical with ISO 5652.

This International Standard specifies a format and recording standard for 9-track, 12,7 mm (0.5 in) magnetic tape to be used for data interchange between information processing systems, communication systems, and associated equipment utilizing the 7-bit coded character set (see ISO 646), its extension in ISO 2022 where required, and the 8-bit coded character set (see ISO 4873). Magnetic labelling for use on magnetic tape is the subject of ISO 1001. The magnetic tape and reel to be used shall conform to ISO 1864.NOTE - Numeric values in the SI and/or Imperial measurement system in this International Standard may have been rounded and therefore are consistent with, but not exactly equal to, each other. Either system may be used, but the two should be neither intermixed nor reconverted. The original design was made using the Imperial measurement system.