HORIZONTAL CABLING

Horizontal Cabling Extends from the telecommunications outlet/connector to the horizontal cross-connect Physical topology is a star (each telecommunications outlet/connector has its own mechanical termination position at the horizontal cross-connect in the telecommunications closet) Includes: Horizontal cables The telecommunications outlet/connector Mechanical terminations in the telecommunications closet Patch cords or jumpers in the telecommunications closet Recognized Media: 4-pair 100 ohm unshielded twisted pair (UTP) 2-pair 150 ohm shielded twisted pair (STP-A) 2-fiber 62.5/125 µm multimode optical fiber 50 ohm coax is a recognized media type, but not recommended for new installations and is expected to be removed from the next revision of the standard Hybrid cables that consist of more than one of the recognized media in a common sheath may be used if they meet the criteria specified Telecommunications Outlet/Connectors: A minimum of two telecommunications outlet/connectors are required at each work area: A: Supported by one 4-pair 100 ohm category 3 or higher UTP cable and associated connector B: Supported by one of the following: 4-pair 100 ohm UTP cable and connector (category 5 recommended) 150 Ohm STP-A cable and connector 2-fiber 62.5/125 µm optical fiber cable and connectors Grounding and bonding must conform to ANSI/TIA/EIA-607 as well as applicable authorities or codes Distances: Cable runs limited to a maximum of 90 meters (295 feet) for all media types Patch cords or cross-connect jumpers at the horizontal cross-connect (HC) should not exceed 6 meters (20 feet) An additional 3 meter (9.8 feet) allowance assumed for patch cords which connect equipment at the work area (WA) Total length of patch cords and cross-connect jumpers must not exceed 10 meters (33 feet) †† (Following the 6 meter and 3 meter guidelines will avoid having to verify whether or not a link may exceed the 10 meter limitation when moves, adds or changes are performed)