Resources on Wall Mounted Racks

Wall Mounted Racks

Wall Mounted

19 Inch Racks

A 19-inch rack is a standardized (EIA 310-D, IEC 60297 and DIN 41494 SC48D) system for mounting various electronic modules in a "stack", or rack, 19 inches (482.6 mm) wide. Equipment designed to be placed in a rack is typically described as rack-mount, a rack mounted system, a rack mount chassis, subrack, or occasionally, simply shelf. The slang expression for a subrack (generally 1U height) is "pizza box" due to the similarity in size and shape.

Because of their origin as mounting systems for telephone switching equipment, they are still sometimes called relay racks, but the 19-inch rack format has remained a constant while the technology that is mounted within it has changed to completely different fields. This standard rack arrangement is widely used throughout the telecommunication, computing, and entertainment industries, as well as others.

The rack's mounting fixture consists of two parallel metal strips (also referred to as "rails") standing vertically. The strips are each 0.625 inches (15.875 mm) wide, and are separated by a gap of 17.75 inches (450.85 mm), giving an overall rack width of 19 inches (482.6 mm). The strips have holes in them at regular intervals, with both strips matching, so that each hole is part of a horizontal pair with a center-to-center distance of 18.3 inches (464.82 mm).

The holes in the strips are arranged vertically in repeating sets of three, with center-to-center separations of 0.5 inch (12.7 mm), 0.625 inch (15.875 mm), 0.625 inch (15.875 mm). The hole pattern thus repeats every 1.75 inches (44.45 mm). Racks are divided into regions, 1.75 inches in height, within which there are three complete hole pairs in a vertically symmetric pattern, the holes being centered 0.25 inch (6.35 mm), 0.875 inch (22.225 mm), and 1.5 inch (38.1 mm) from the top or bottom of the region. Such a region is commonly known as a "U", for "unit", and heights within racks are measured by this unit. Rack-mountable equipment is usually designed to occupy some integral number of U. For example, an oscilloscope might be 4U high, and rack-mountable computers are most often 2U or 1U high.

Excerpt from "19-inch rack." Wikipedia, The Free Encyclopedia. 20 Oct 2006, 13:36 UTC. Wikimedia Foundation, Inc. 30 Oct 2006 http://en.wikipedia.org/w/index.php?title=19-inch_rack&oldid=82620559

Server

• Server (computing), a computer that provides services to other computers, or the software that runs on it
• Application server, a server dedicated to running certain software applications
• Communications server, carrier-grade computing platform for communications networks
• Database server, provides database services
• Fax server, provides fax services for clients
• File server, provides file services
• Game server, a server that video game clients connect to in order to play online together
• Standalone server, an emulator for client-server (web-based) programs
• Web server, a server that HTTP clients connect to in order to send commands and receive responses along with data contents.
• Client-server, a software architecture that separates "server" functions from "client" functions
• The X Server part of the X Window System
• Peer-to-peer, a network of computers running as both clients and servers

Excerpt from "Server." Wikipedia, The Free Encyclopedia. 26 Oct 2006, 02:23 UTC. Wikimedia Foundation, Inc. 27 Oct 2006 http://en.wikipedia.org/w/index.php?title=Server&oldid=83766366