Accession Number : AD0671865

Title :   DATA TRANSMISSION SYSTEM (TELTAP II). GENERAL DESCRIPTION, OPERATOR'S MANUAL AND PROGRAM DESCRIPTION.

Descriptive Note : Computer systems manual,

Corporate Author : NATIONAL MILITARY COMMAND SYSTEM SUPPORT CENTER WASHINGTON D C

Personal Author(s) : Straub,Lester R.

Report Date : 05 MAR 1968

Pagination or Media Count : 59

Abstract : Telephone Tape (TELTAP II) is a software system designed to provide high-speed data transmission capabilities to and from a remote data processing center. The system transmits data for a magnetic tape station via a Control Data 8090 computer system, utilizing a CDC 8529 Data Set Controller to allow computer control of the transmission hardware. An encrypting device is used for security purposes. TELTAP II provides for transmitting any data capable of being recorded on magnetic tape in physical records not to exceed 3000 six-bit characters in length. The computer operators communicates by a direct line telephone between terminals to coordinate data transmissions. The program provides an effective data transfer rate of approximately 78.4/79.6 to 2400/4920 characters per second. This effective rate is dependent on the number of characters in each tape block (the longer records being more efficient due to fewer inter-record gaps on tape), and if the program has to perform its own pre/post processing ('Packing/Unpacking'). The program also provides a recovery procedure in the event that the communications equipment losses sync, and manual intervention becomes necessary. Error detection is included to minimize errors. This is done both in the transmission of data and in the handling of magnetic tape input/output. (Author)

Descriptors :   (*DATA TRANSMISSION SYSTEMS, TELEPHONE SYSTEMS), (*DATA PROCESSING, *INSTRUCTION MANUALS), DIGITAL SYSTEMS, ERRORS, SECURE COMMUNICATIONS, COMPUTER PROGRAMS, MAGNETIC TAPE, SYNCHRONIZATION(ELECTRONICS), COMPUTER OPERATORS, REDUNDANT COMPONENTS, SUBROUTINES, FLOW CHARTING, CRYPTOGRAPHY

Subject Categories : Computer Programming and Software
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE