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2. Structural channel - Wikipedia

   en.wikipedia.org/wiki/Structural_channel

   Structural channel. The structural channel, also known as a C-channel or Parallel Flange Channel (PFC), is a type of (usually structural steel) beam, used primarily in building construction and civil engineering. Its cross section consists of a wide "web", usually but not always oriented vertically, and two "flanges" at the top and bottom of ...

3. Strut channel - Wikipedia

   en.wikipedia.org/wiki/Strut_channel

   Cross section diagram of standard strut channel. Basic strut channel comes in the open box section 1 + 5 ⁄ 8 in (41 mm) square. A half height 1 + 5 ⁄ 8 in × 13 ⁄ 16 in (41 mm × 21 mm) version is also available, used mostly where mounted directly to a wall as it has significantly less stiffness and ability to carry loads across an open space or brace.

4. I-beam - Wikipedia

   en.wikipedia.org/wiki/I-beam

   An I-beam used to support the first floor of a house. An I-beam is any of various structural members with an I - or H -shaped cross-section. Technical terms for similar items include H-beam, I-profile, universal column ( UC ), w-beam (for "wide flange"), universal beam ( UB ), rolled steel joist ( RSJ ), or double-T (especially in Polish ...

5. ATSC standards - Wikipedia

   en.wikipedia.org/wiki/ATSC_standards

   t. e. Advanced Television Systems Committee ( ATSC) standards are an International set of standards for broadcast and digital television transmission over terrestrial, cable and satellite networks. It is largely a replacement for the analog NTSC standard and, like that standard, is used mostly in the United States, Mexico, Canada, South Korea ...

6. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   The 19-inch (482.6 mm) standard rack arrangement is widely used throughout the telecommunication, computing, audio, video, entertainment and other industries, though the Western Electric 23-inch standard, with holes on 1-inch (25.4 mm) centers, is still used in legacy ILEC / CLEC facilities. A 19-inch rack used for switches at the DE-CIX in ...

7. C band (IEEE) - Wikipedia

   en.wikipedia.org/wiki/C_band_(IEEE)

   The C band is a designation by the Institute of Electrical and Electronics Engineers (IEEE) for a portion of the electromagnetic spectrum in the microwave range of frequencies ranging from 4.0 to 8.0 gigahertz (GHz). [ 1] However, the U.S. Federal Communications Commission C band proceeding and auction, designated 3.7–4.2 GHz as C band. [ 2]