General Electric TDM 114 Data Set Modem
date: label: date made
content: c. 1964
name: label: maker
content: General Electric Company
notes: label: Description
content: This modem was used with a terminal (2007.0180.01) in Minneapolis, Minnesota, for remote communications with a mainframe digital computer and was owned and used by Hal Becker, a General Electric programmer and engineer. The terminalis used for a telephone system and for receving digital data in the form of a time multiplexed (TDM) stat stream incorporating frames appeared at a predetermined frame period and each frame incorporated a frame word. The terminal comprises a frame word detecting circuit for detecting frame words; an alignment detecting cicuit for determining whether a recieved TDM data stream is in alignment or not; a search circuit for initiating a bit-by-bit search of the incoming stat stream for the sequence bits forming the frame word when an "out-of-alignment" condition has been detected by the said alignment detecting circuit; and a delay circuit for delaying the start of the bit-by-bit seach after an "out-of-alignment" condition has been detected. The museum number Includes a cover, base and removable lock-clip reciever/transmitter cup with connector. (The vibration foam rubber has been removed due to decomposition prior to aquisition.)
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Computers
creditLine: label: Credit Line
content: Hal Becker
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 2007.0180.02
label: catalog number
content: 2007.0180.02
label: accession number
content: 2007.0180
objectType: label: Object Name
content: computer peripheral
label: Object Name
content: mainframe computer peripheral
physicalDescription: label: Physical Description
content: plastic (overall material)
label: Physical Description
content: metal (overall material)
label: Measurements
content: modem: 4 1/4 in x 7 3/4 in x 10 1/2 in; 10.795 cm x 19.685 cm x 26.67 cm
label: Measurements
content: case: 5 1/4 in x 10 3/4 in x 13 1/2 in; 13.335 cm x 27.305 cm x 34.29 cm