MIL-HDBK-1300A
material, including pictures or images, is scanned and the information converted into electrical signals that may be transmitted over a telecommunication system and used to record a copy of the original. Note 1: Wirephoto and telephoto are facsimile via wire circuits; radiophoto is facsimile via radio. Note 2: Current facsimile systems are designated and defined as follows: (a) group 1 facsimile: A mode of black/white facsimile operation as defined in CCITT Recommendation T.2, which uses double sideband modulation without any special measures to compress the bandwidth.
Note 1: A 216x279 mm document (8 1/2 x 11 inches) may be transmitted in approximately 6 minutes via a telephone-type circuit. Additional modes in this group may be designed to operate at a lower resolution suitable for the transmission of documents 216 x 279 mm in a time between 3 and 6 minutes. Note 2: The CCITT frequencies used are 1300 Hz for white and 2300 Hz for black. The North American standard is 1500 Hz for white and either 2300 or 2400 Hz for black. (b) group 2 facsimile: A mode of black/white facsimile operation as defined in CCITT Recommendation T.3, which accomplishes bandwidth compression by using encoding and vestigial sideband, but excludes processing of the document signal to reduce redundancy. Note: A 216 x 279 mm document (8 1/2 x
11 inches) may be transmitted in approximately 3 minutes using a 2100-Hz AM/PM/VSB, over a telephone-type circuit. (c) group 3 facsimile: A mode of black/white facsimile operation as defined
in CCITT Recommendation T.4, which incorporates means for reducing the redundant information in the document signal using a one-dimensional run-length coding scheme prior to the modulation process. Note 1: A 216 x 279 mm document (8 1/2 x 11 inches) may be transmitted in approximately
1 minute or less over a telephone-type circuit with twice the group 2 horizontal resolution; vertical resolution may also be doubled. Note 2: Group 3 machines have integral digital modems. Note 3: An optional two-dimensional bandwidth compression scheme also is defined within the group 3 facsimile specification. (d) group 4 facsimile: A mode of black/white facsimile operation as defined
in CCITT Recommendations T.5 and T.6. Note: Uses bandwidth compression techniques to transmit an essentially error-free 216 x 179 mm (8 1/2 x 11 inches) document at a nominal resolution of eight lines/mm in less than 1 minute over a public data network voice-grade circuit.
another.
df. File Transfer Protocol (FTP) - A protocol for transferring files from one system to
dg. Fill - In NITFS context, optional data inserted at the end of a coded image line. Fill is designated by inserting a variable length of zeroes.
dh. Flag - In data transmission, an indicator, such as a signal, symbol, character, or digit, used for identification. Note: An example is a word mark, a group mark, or letter that signals the occurrence of some condition or event such as the end of a word or block.
di. Forward Discrete Cosine Transform (FDCT) - A mathematical transformation using cosine-based functions that convert a block of samples into a corresponding array of basis function amplitudes.
dj. Forward Error Correction (FEC) - A system of error control for data code trans- mission wherein the receiving device has the capability to detect and correct any character or block that contains fewer than a predetermined number of symbols in error. Note: FEC is accomplished by adding bits to each transmitted character or code block using a predetermined algorithm.
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