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Horizontal Cabling System Structure Guide

The horizontal cabling system extends from the telecommunications outlet in the work area to the horizontal cross-connect in the telecommunications room. 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.

An allowance of 10m (33 ft.) has been provided for the combined length of patchcords/cross-connect jumpers and equipment cables/cords in the HC, including the WA equipment cords.

In ISO/IEC 11801:2002, the equivalent cabling element to the horizontal cross-connect (HC) is called the floor distributor (FD).

Components of a Horizontal Cabling System

Horizontal Cabling System Structure Enlarge this image
  1. Customer Premises Equipment
  2. HC Equipment Cord
  3. Patchcords/cross-connect jumpers used in the HC, including equipment cables/cords, should not exceed 5m (16 ft.).
    Note: ISO/IEC 11801:2002 specifies a max. patchcord/ cross-connect length of 5m (16.4 ft.), which does not include equipment cables/cords.
  4. Horizontal cable 90m (295 ft.) max. total
  5. TP or CP (optional)
  6. Telecommunications outlet/connector (TO)
  7. Work Area (WA) Equipment cord
    Note: An allowance is made for WA equipment cords of 5m (16 ft.).

Key points for the horizontal cabling subsystem include:

  • unshielded twisted-pair (UTP)Recognized Horizontal Cables:
  • Multi-unit cables are allowed, provided that they satisfy the hybrid/bundled cable requirements of TIA/EIA-568-B.2, ISO/IEC 11801:2002.
  • groundingGrounding shall conform to applicable building codes and the requirements of ANSI-J-STD-607-A. Learn more about grounding and bonding of shielded cabling. and watch video.
  • A minimum of two telecommunications outlets are required for each individual work area. First outlet: 100 Ω twisted-pair (category 6 is recommended). Second outlet: 100 Ω twisted-pair or two-fiber multimode optical fiber either 62.5/125µm or 50/125µm.
  • One transition point (TP) or Consolidation Point (CP) is allowed. The term "transition point" was removed from the second edition of ISO/IEC 11801:2002. Under carpet cabling is no longer recognized by that standard.
  • 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. (Fiber splices are allowed for fiber optic cables.)
  • 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 crossconnect (eg. splitters, baluns).
  • The proximity of horizontal cabling to sources of electromagnetic interference (EMI) shall be taken into account.

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