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campus wiring

In structured cabling, the site is wired via the primary cabling. This cabling integrates the subnetworks of a campus that exist in the individual buildings.

The primary cabling comprises the area from the main distribution board (MDS) to the building distribution boards (BDS). At least one distribution board is required per building for connection to the primary network. The ISO/IEC 11801 and EN 50173standards recommend a length of 1,500 m between the main distribution board and the building distribution board for structured cabling.

Cabling structure according to ISO/IEC 11801

Cabling structure according to ISO/IEC 11801

In general, multimode fibers with 50/62.5/125 µm are used for the cabling in the field; however, monomode fibers with 10/125 µm can also be used, but mainly for very large distances between the buildings.

Redundant off-road cabling in ring and star topology

Redundant off-road cabling in ring and star topology

However, the standards also permit symmetrical copper cables for applications with lower transmission speeds, whereby cables with 100 Ohm characteristic impedance ofcategory 3 and 4 are preferred.

The following requirements are placed on off-road cabling:

Bridging of large distances, lightning protection, interference resistance, eavesdropping resistance, future orientation, failure safety, high availability, maintainability, safe and documented routing, potential separation between building groundings, integration of independent subnetworks of any technology, high transmission capacity, redundant design and alternative routing for emergencies.

In the case of off-road cabling, attention must also be paid to the expandability of the main distribution boards for problem-free integration of new buildings.

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Englisch: campus wiring
Updated at: 25.09.2007
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