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provides testing and registration services resulting in the
designation of the registered communications distribution
designer (RCDD).  The RCDD designation is held by both Government
and commercial telecommunications designers and should become a
requirement for those preparing and reviewing architectural plans
for telecommunications installations.  It is incumbent upon the
RCDD assigned to the project to determine the requirements and
formulate a design through an organized decision making process.
These decisions will form the primary design elements necessary
to interface the building or campus tenants (generally referred
to as the local users) to the serving local and wide area
networks (LANs/WANs) and telecommunications systems, which the
user must access to meet mission performance objectives.  The
primary design elements to be assessed when developing a building
or campus telecommunications infrastructure include:  workstation
requirements and locations; type and quantity of horizontal cable
distribution; location and size of telecommunications closets;
type and size of vertical cable distribution and supporting
pathways; building entrance or point of presence (POP); and
inter-building (outside plant) distribution.  Each of these
design elements forms an integral part of the overall
telecommunications distribution system.  Figure 2 illustrates a
typical building distribution scheme.  It is the responsibility
of the design agency or team to integrate each element into a
comprehensive distribution design which will meet the
telecommunications connectivity requirements consistent with the
functionality of the building and its tenants.  The design
objective is to ensure that the building and campus cable
pathways will be capable of supporting cabling requirements for
the useful life of the building, 50 years.  The building's
horizontal cable plant is expected to accommodate
telecommunication requirements for a minimum period of 10 years.
This section defines the telecommunications requirements for
various types of buildings, introduces applicable standards, and
provides rationale for the optional decisions that may be made to
alter the default conditions in the estimating software.
Commercial standards have been used in determining these
requirements.  Electronic Industries Association (EIA)/TIA 568,
Commercial Building Telecommunications Cabling Standard and TIA
569, Commercial Building Standard for Telecommunications Pathways
and Spaces and NFPA 70, National Electrical Code provide the
majority of the direction.  The RCDD must be familiar with these
references.  This section lends itself equally to new
construction and renovation projects.  In the case of renovation,
the RCDD must be conscious of existing systems which may be
comprised of older distribution materials no longer recommended
by commercial standards.  For instance, a building wired with 50
ohm coaxial cable for LAN operations may be rewired with CAT 5
unshielded twisted pair (UTP) to support future requirements and

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