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Proposed Changes to the Facsimile System
  • Published Date:
    1981
Filetype[PDF - 297.05 KB]


Details:
  • Personal Authors:
  • Corporate Authors:
    National Meteorological Center (U.S.)
  • Description:
    "The facsimile switching system is rather unique to the National Weather Service. The only similar system is at Offut and that was partly engineered with the aid of NWS personnel. The system consists of an IBM host (either a 360-30 or 360-40) and three Interdata-50 (ID50) computers configured as programmable front-ends. The use of a mini-computer as a front end allows us the option of rather easily building special interface boards. Two proto-type boards were hand-built and then production ones were built by a contractor both for the Air Force and NWS. One board, the facsimile transmitter contained an interface to transfer a bit pattern representing a facsimile scan line into a communication circuit as a properly coded WMO facsimile signal. The computer micro-code can transfer an entire facsimile line from memory at the rate required by the speed of the circuit. The page margin time is sufficient to interupt the computer so as to provide new line buffers, handle the input queues and unpack new lines. There are control commands that set the carrier frequency and speed appropriate to-the circuit. There are provisions for the start tone, phasing signal, and MOMS (a facsimile label signal) code. There are also provisions for interfacing the DACOM (a data compression processor) encoder in the DIFAX or AFDIGS mode, and producing the APT (a facsimile standard) signal for WEFAX"--Page 1.

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