drum factor
1. In facsimile systems in which drums are used, the ratio of drum length to drum diameter.
2. In facsimile systems in which drums are not used, the ratio of (a) the page width to (b) the page length divided by .
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Description
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drum speed
In facsimile systems, the rotation rate of the facsimile transmitter or recorder drum.
Note: Drum speed is usually expressed in revolutions per minute.
DS
1. Digital Signal.
2. Description Schemes,
3. Double Stimulus.
DS-TE
Differentiated-Service - Traffic Engineering
DS0
Abbreviation for digital signal
0.
DS1 . . . DS4
Abbreviations for digital signal
1. . . digital signal
4.
DS1C
Abbreviation for digital signal 1C.
DSA
Abbreviation for dial service assistance, directory system agent.
DSA board
A local dial office switchboard at which are handled assistance calls, intercepted calls, and calls from miscellaneous lines and trunks. It may also be employed for handling certain toll calls. [47 CFR Pt.36-A]
DSB
Abbreviation for double sideband. See double-sideband transmission.
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