Horizontal Cabling System Structure
The horizontal cabling system extends from the telecommunications outlet in the work area to the horizontal cross-connect in the telecommunications closet. It includes the telecommunications outlet, an optional consolidation point or transition point connector, horizontal cable, and the mechanical terminations and patch cords (or jumpers) that comprise the horizontal cross-connect.
Application specific components shall not be installed as part of the horizontal cabling. When needed, they must be placed external to the telecommunications outlet (or horizontal cross-connect).
Some points specified for the horizontal cabling subsystem include:
- The proximity of horizontal cabling to sources of electromagnetic interference (EMI) shall be taken into account. (Specific guidelines are provided in ANSI/TIA/EIA-569-A.)
- One transition point (TP) is allowed between different forms of the same cable type (i.e. where undercarpet cable connects to round cable).
NOTE: The definition provided for a "transition point" in ISO/IEC 11801 is broader than '568-A. It includes transitions to under carpet cabling as well as consolidation point connections.
- A minimum of two telecommunications outlets are required for each individual work area.
- First outlet: 100 W UTP
- Second outlet: 100 W UTP,150 W STP-A or 62.5/125 µm multimode fiber
- Grounding must conform to applicable building codes, as well as ANSI/TIA/EIA-607.
- 50 W coaxial connectors and cable are recognized, but not recommended for new cabling installations.
- Additional outlets may be provided. These outlets are in addition to and may not replace the minimum requirements of the standard.
- Bridged taps and splices are not allowed for copper-based horizontal cabling. (Splices are allowed for fiber.)
Recognized Horizontal Cables:
4-pair 100 W UTP (cat. 5 recommended)
NOTE: In addition, two alternate horizontal cabling types allowed by ISO/IEC 11801 are 120 W twisted-pair and 50/125 µm multi-mode optical fiber.
- Multi-pair cable is allowed,provided that it satisfies the hybrid crosstalk requirements
- Multi-unit cables are allowed, provided that they meet hybrid crosstalk requirements.
- The horizontal cabling shall be configured in a star topology; each work area outlet is connected to a horizontal cross-connect (HC) in a telecommunications closet (TC).