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
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. Notes:
*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).
Customer Premises Equipment
HCEquipment Cord
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.
Horizontal cable 90m (295 ft.) max. total
TP or CP (optional)
Telecommunications outlet/connector (TO)
WA Equipment cord
Note: An allowance is made for WA equipment cords of 5m (16 ft.).
Some points specified for the horizontal
cabling subsystem include:
Recognized Horizontal Cables:
4-pair 100 次 unshielded twisted-pair (UTP) or screened twisted-pair
(F/UTP).
4-pair 100 次 fully shielded twisted-pair (S/FTP) (ISO/IEC 11801:2002
only).
2-fiber (duplex) 62.5/125米m or 50/125米m multimode optical fiber.
Multi-unit cables are allowed, provided that they satisfy the
hybrid/bundled cable requirements of TIA/EIA-568-B.2, ISO/IEC
11801:2002.
Grounding shall conform to applicable building codes and the requirements
of ANSI-J-STD-607-A.
A minimum of two telecommunications outlets are required for each
individual work area. First outlet: 100 次 twisted-pair (category
6 is recommended). Second outlet: 100 次 twisted-pair or two-fiber
multimode optical fiber either 62.5/125米m or 50/125米m.
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. (Splices are allowed for fiber.)
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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