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Ds,symbol for the element darmstadtiumdarmstadtium,
artificially produced radioactive chemical element; symbol Ds; at. no. 110; mass number of most stable isotope 281; m.p., b.p., sp. gr., and valence unknown. Situated in Group 10 of the periodic table, it is expected to have properties similar to those of platinum.
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drop siding, novelty siding, rustic siding
An exterior wall cladding of wooden boards (or strips of other material such as aluminum or vinyl), which are tongued and grooved or rabbeted and overlapped so that the lower edge of each board interlocks with a groove in the board immediately below it.
On drawings, abbr. for downspout.
DS(1) See Nintendo DS.
(2) (Digital Signal) A classification of digital circuits. The DS technically refers to the rate and format of the signal, while the T designation refers to the equipment providing the signals. In practice, "DS" and "T" are used synonymously; for example, DS1 and T1, DS3 and T3. See OC.
NORTH AMERICA, JAPAN, KOREA, ETC.VoiceService Channels Speed DS0 1 64 Kbps DS1 24 1.544 Mbps (T1) DS1C 48 3.152 Mbps (T1C) DS2 96 6.312 Mbps (T2) DS3 672 44.736 Mbps (T3) DS4 4032 274.176 Mbps (T4) EUROPE (ITU)Voice SpeedService Channels (Mbps) E1 30 2.048 E2 120 8.448 E3 480 34.368 E4 1920 139.264 E5 7680 565.148 SONET CIRCUITSOptical Electrical SpeedChannel Channel (Mbps) OC-1 STS-1 51.84 OC-3 STS-3 155.52 OC-3c STS-3c 155.52 OC-12 STS-12 622.08 OC-12c STS-12c 622.08 OC-48 STS-48 2488.32 OC-192 STS-192 9953.28 OC-768 STS-768 39813.12 OC = Optical Carrier STS = Synchronous Transport Signal c = concatenated