Subrack
Subracks are open housing made of metal, which for the reception of circuit boards (z. B. Europe cards ) and modules are used. The usual subracks correspond to the 19 "design .
use
Subracks are used for industrial, scientific and commercial applications. They enable the insertion, supply and connection of the plugged modules.
Determinations
The structure of 19 "subracks is specified in German and international standards.
- Europe standard: IEC 60297-3-101, -102, -103, -104
- US standard: ANSI / EIA RS-310
- IEEE 1101.1, IEEE 1101.10, IEEE 1101.11
construction
A subrack normally contains:
- Guide rails for the secure hold of the assemblies
- Backplane bus , also known as bus board or backplane , for receiving the plug-in contacts and connecting the modules to each other
- Connector for the connection to the backplane bus and the connection between the modules
width
The external width of a subrack is 19 "= 482.6 mm.
The opening width of a subrack (BGTR / BGT) is specified in pitch units (TE), where 1TE = 0.2 "= 5.08 mm. For a 19" subrack, 84 usable pitch units are assumed.
Height (U)
The height of a rack is in rack units specified (HE), where 1U = 1.75 "= 44.45 mm. In general, for" HE "and" TE "and the American designations U and HP Rack U nit and H orizontal P to find itch. are usual heights of 3 (single map of Europe ) or 6 (double Europa card) height units.
depth
The depth of a module rack depends on the depth of the modules to be used ( Eurocards ).
Assembly
Subracks are usually screwed together in standardized (DIN 41 494) steel frames. These steel frames are installed in steel cabinets, usually rotatable.