Technical Reference

Network and server Racks, Panels and Associated Equipment

(From EIA Standard RS-310-D and Standards Proposal No. 1257, formulated under the cognizance of EIA Working Group P-5.6 on server and network racks, panels and enclosures.)

1. SCOPE

1.1 This standard establishes those dimensions which are critical in ensuring compatibility between racks (open and close), panels, and the equipment or apparatus installed thereon. It is intended as a guide to equipment manufacturers and designers.

1.3 Classification - Network cabinet and server rack widths to accommodate each of two standard EIA/TIA panel widths; 19" and 23". Please note other adopted manufacturing standards include 24 and 30" panel widths. The 19" is the preferred width.

2. DEFINITIONS

2.1 Communication Rack

A rack, as defined for the purposes of this Standard, is a floor-standing structure primarily designed for, and capable of, supporting equipment. All racks described herein provide for the mounting of panels as elaborated upon in category 2.2 below.

2.1.1 Open Rack

An open rack, as defined for the purposes of this Standard, consists only of the structural members necessary for supporting of equipment and is not intended to be enclosed. The vertical members provide mounting surfaces with holes for the mounting of panels

2.1.2 Enclosed Rack

An enclosed rack, as defined for the purposes of this Standard, is constructed to have the capability of being completely enclosed; commonly referred to in the industry as "cabinet enclosures".

2.1.3 Mounting Rail

A mounting rail, as defined for the purposes of this Standard, is the surface of a rack on which panels mount

2.2 Panels

Panels, as defined for the purposes of this Standard, are fabricated to be mounted on the mounting rails of racks. They are generally used for mounting controls, data presentation, apparatus or equipment.

Mounting and "U" Spacing

Unit - The modular unit “U” on which panel heights are based is 1.750in (44.45mm).

The following are some of the standards for our products:

Mounting dimensions on all racks and cabinets is 19" EIA (18.312") or 23" EIA (22.312")
Open space between rack uprights or cabinet mounting angle is 17.750" for 19"EIA and 21.750 for 23"EIA.
Thread size on all tapped parts is 10-32 Class UNF-2B or 12-24 Class UNC-2B.
All vertical components like doors, vertical cable mangers, wall mount cabinets are universally hinged left or right.
Materials used are: steel HRPO or CRS.

MOUNTING RAILS

Mounting rails shall be standard conforming to EIA RS-310-C page 4 figure 2 (see figure below).

* Holes shall be 0.281± 0.005 in. (7.1± 0.1 mm) diameter, 10-32 Class UNF-2B, 12-24 Class UNC-2B, M5X.8-6H or M6X1-6H thread.

Terminology and Definitions

Backbone Cable	A cable run vertically in a building to provide pairs to each floor. It is recommended that this cable be shielded. Minimize voltages of lightning strikes to the building by running the backbone cables along the central axis of the building.
Backbone Raceway	The portion of the pathway system that permits the placing of main or high-volume cables between the entrance location and all cross-connect points within a building and between buildings
Cable Assembly	An optical fibre cable that has connectors installed on one or both ends. General use of these assemblies include: -Optoelectronic equipment; and, -Interconnection of multimode and single mode optical fibre cable systems. * NOTE: If connectors are attached to only one end of the cable, the cable assembly is a pigtail. If connectors are attached to both ends, it is a jumper.
Cable Tray	A ladder, trough, solid-bottom or channel raceway system intended for, but not limited to, the support of telecommunication media (e.g. cable).
Crossover	The junction unit at the point of intersection of two cable trays or conduits (pathways) on different planes.
Distribution Panel	A wiring board that provides a patch panel function and mounts either in a rack or on a wall.
Fibre	A fibre is a thin filament of glass / optical waveguide consisting of a core and a cladding which is capable of carrying information in the form of light.
Fusion Splice	A permanent joint accomplished by applying localized heat sufficient to fuse or melt the ends of the optical fibre, forming a continuous single fibre.
Router	In a local area network, a router receives physical-level signalling from a network and performs data-link-level and network-level protocol processes upon those signals, and then sends them via appropriate data-link-level and physical-level protocols onto another network. The transport, session, presentation, and application levels of the information handled remain unchanged. The primary function of a router is to determine how to forward a packet toward its destination, based on tables within the router that indicate the costs, congestion status, and other factors associated with possible routers.