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Telecommunications Systems Bulletin TSB-5018 Structured
Cabling Infrastructure Guidelines to Support Distributed
Antenna Systems. That document was published in July 2016.
Key design concerns for DAS include the following.
• Number of carriers/service providers
• Entrance facilities
• Head end room size
• Site survey to determine signal propagation
• Antenna locations
• Prefabricated or field termination of cables
The number of carriers determines three aspects: the size of
the entrance facility; the head end room size; and the types
of antennas. The required equipment determines the facility
size. The number of carriers determines the frequency range
requirement of the antennas.
The survey of the building or outdoor space identifies the signal propagation of all areas to be serviced. At least two characteristics determine the propagation: coverage area size and
blockage, and absorption of construction materials.
Two factors determine the decision between preterminated
cables and field termination: the distribution of cables, both
coaxial and fiber; and ease of cable installation. Preterminated
cables tend to have cost lower than that of field termination.
Field termination has increased labor cost due to increased
hourly labor rates and reduced labor utilization.
If accurate cable lengths are known, the choice will favor
preterminated cables. If the cables can be easily installed, such
as up unoccupied vertical conduits, above removable ceiling
tiles, and between wall studs prior to wall installation, cables
can be installed without damaging fibers or connectors. With
both well-known lengths and easy installation, preterminated
cables are usually the choice.
Cables are of two types, preterminated and not. During installation, preterminated cables require care to avoid damaging both the cable near the connectors and the connectors.
One method of avoiding damage is enclosing the connectors
in a shroud that prevents the connectors from snagging. The
shroud is temporarily attached to the cable and removed after
A second method to avoid damage is the installation of cable preterminated on one end. The unterminated end is pulled
into location, eliminating stress on a preterminated end.
Preterminated or not, cable installation requires attention to the three most important cable characteristics: installation load and the two bend radii. Because damage is easier in