Structured Cabling System: An Overview of the Six Major Components

Structured Cabling System: An Overview of the Six Major Components

Enterprise Networking Mag | Wednesday, June 22, 2022

Entrance Facilities, Equipment Room, Backbone Cabling, Telecommunications Room, Horizontal Cabling, and Work Area are the six components of structured cabling.

FREMONT, CA: General infrastructures like schools and hospitals often utilize the more common ANSI/TIA-568-C.0 (Generic telecommunications cabling for customer premises), whereas commercial buildings typically use the more specific ANSI/TIA-568-C.1 (Commercial Building Telecommunications Cabling Standard).

Entrance Facilities (EF)

Entrance Facilities (EF) involve connections between exterior infrastructure and inside cabling.

Equipment Room (ER)

The centralized, climate-controlled area for telecommunications equipment is typically more intricate than a telecommunications room (TR) or telecommunications enclosure (TE). It typically contains the major cross-connect (MC) [Distributor C] and may also contain the horizontal cross-connects (HCs) [Distributor A] or the intermediate cross-connects (ICs) [Distributor B].

Backbone Cabling

The backbone cabling connects telecommunications rooms, equipment rooms, access provider (AP) spaces, and entrance facilities. Two subsystems are specified for backbone cabling:

Cabling Subsystem 2: Backbone cabling from the horizontal crosses-connect (HC) [Distributor A (DA)] to the intermediate cross-connect (IC) [Distributor B (DB)].

Cabling Subsystem 3: Backbone cabling between an intermediate cross-connect. (IC) [DB] [Distributor B as well as the primary cross-connect (MC) [Distributor C (DC)].

Identified cabling:

• 100-ohm twisted-pair cabling: Category 3, Category 5e, Category 6, or Category 6A twisted-pair cabling with 100-ohm impedance

• Multimode optical fiber cabling is advised: laser-optimized 50/125 m at 850 nm; 62.5/125 m and 50/125 m are permitted.

• Single-mode optical fiber cabling

Telecommunications Room (TR) and Telecommunications Enclosure (TE)

A TR or TE contains horizontal and backbone cable terminations to connecting gear, including patch cords and jumpers. It may also have the IC or MC for different backbone cabling system segments. In addition, the TR or TE provides a controlled environment for housing telecommunications equipment, connecting gear, and splice closures serving a portion of the structure.

Utilizing a telecoms enclosure (TE) is for a specific implementation, not a universal circumstance. It is designed to service a smaller floor area than a TR and can be used in addition to the "one TR per floor" requirement.

Horizontal Cabling – (Cabling Subsystem 1)

The horizontal cabling system stretches from the telecommunications information outlet in the work area to the telecommunications room (TR) or telecommunications enclosure (TE). It consists of a horizontal cable, mechanical terminations, jumpers, and patch cords located in the TR or TE, and it may include multiuser telecommunications outlet assemblies (MUTOAs) and consolidation points (CPs). The most significant horizontal cable length shall be 90 meters (295 feet) regardless of the media type. The top horizontal balanced twisted-pair copper cable length must be shortened if a MUTOA is deployed.

Identified cabling:

• 4-pair 100-ohm twisted-pair cable, unshielded or shielded:

• Category 5e, Class 6, or Class 6A

• 2-fiber multimode optical fiber cable (or higher fiber count)

• 2-fiber single-mode optical fiber cable (or higher fiber count)

Work Area

Work area (WA) components stretch from the horizontal cabling system's telecommunications outlet/connector end to the WA equipment.

Each work area should be equipped with two communication outlets (permanent connectivity). If utilized, multiuser telecommunications outlet assemblies (MUTOAs) are included in the WA.

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