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<td width="90%"><font face="Arial" size="3"><font color="#008080"><b><img border="0" src="../../images/arrow_down.gif" width="19" height="12"></b></font></font><b><font face="Arial" color="#008080" size="3">Centralized
optical fiber cabling </font><font color="#CCCC00" size="3" face="Arial">::</font></b></td>
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<p align="right"><font face="Arial" size="3" color="#008080"><b>44/55</b></font></td>
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<td><font face="Arial" size="2"><img border="0" src="../../images/transdot.gif" width="45" height="1"></font></td>
<td><font face="Arial" size="2">Many single tenant users of high performance
optical fiber are implementing data networks with centralized electronics
versus distributed electronics in the building. Centralized optical fiber
cabling is designed as an alternative to the optical cross-connection
located in the telecommunications room when deploying recognized optical
fiber cable in the horizontal in support of centralized electronics.</font>
<p><font face="Arial" size="2">Centralized cabling provides connections
from work areas to centralized cross-connects by the use of pull-through
cables, an interconnection, or splice.</font></p>
<p><font face="Arial" size="2">The horizontal cross-connection as
specified in ANSI/TIA/EIA-568-B.1 and ANSI/TIA/EIA-568-B.3 provides the
user with maximum flexibility, specifically in the deployment of
distributed electronics or in multi-tenant buildings.</font></p>
<p><font face="Arial" size="2">Careful planning and implementation of
centralized optical fiber cabling will help assure that the user maintains
adequate flexibility and manageability with the cabling network.</font></p>
<p><font face="Arial" size="2"><b>Applicability</b></font></p>
<p><font face="Arial" size="2">The guidelines and requirements for
centralized optical fiber cabling networks are intended for those
single-tenant users who desire to deploy centralized electronics rather
than distributed electronics and want an alternative to locating the
cross-connection in the telecommunications room.</font></p>
<p><font face="Arial" size="2"><b>General guidelines</b></font></p>
<p><font face="Arial" size="2">This specifies the use of either
pull-through cables, an interconnection, or splice in the
telecommunications room. The use of an interconnection between the
backbone and horizontal cabling is recognized to offer increased
flexibility, manageability, and ease to migrate to a cross-connection.</font></p>
<p><font face="Arial" size="2"><b>Requirements</b></font></p>
<ul>
<li><font face="Arial" size="2">The specifications of ANSI/TIA/EIA-569-A
shall be followed. </font></li>
<li><font face="Arial" size="2">The maximum horizontal cabling distance
is as specified in clause 4. </font></li>
<li><font face="Arial" size="2">The installation shall be limited to 300
m (984 ft) consisting of the combined length of the horizontal,
intrabuilding backbone, and patch cords. Adhering to the 300 m (984
ft) limitation will ensure that the recognized cabling system will
support multi-gigabit services using centralized electronics. </font></li>
<li><font face="Arial" size="2">Centralized cabling implementations
shall be located within the same building as the work areas
served. </font></li>
<li><font face="Arial" size="2">The administration of moves and changes
shall be performed at the centralized cross-connect. </font></li>
<li><font face="Arial" size="2">The pull-through cable length shall be
less than or equal to 90 m (295 ft). </font></li>
<li><font face="Arial" size="2">Pull-through cables shall meet the same
requirements of recognized horizontal optical fiber cable per clause 4
of ANSI/TIA/EIA-568-B.3. </font></li>
<li><font face="Arial" size="2">Centralized cabling design shall allow
for migration (in part or in total) of the pull-through, interconnect,
or splice implementation to a cross-connection implementation. </font></li>
<li><font face="Arial" size="2">Sufficient space shall be left in the
telecommunications room to allow for the addition of patch panels
needed for the migration of the pull-through, interconnect, or splice
to a cross-connection. </font></li>
<li><font face="Arial" size="2">Sufficient cable slack shall exist in
the telecommunications room to allow movement of the cables when
migrating to a cross-connection.</font></li>
</ul>
<blockquote>
<blockquote>
<p><font face="Arial" size="1">NOTE 1 - Pull-through cables are
continuous sheath cables that are pulled through a telecommunications
room from the centralized cross-connect to the telecommunications
outlet/connector.</font></p>
</blockquote>
</blockquote>
<ul>
<li><font face="Arial" size="2">Slack storage shall provide bend radius
control so that cable and fiber bend radius limitations are not
violated. </font></li>
<li><font face="Arial" size="2">Fiber slack shall be stored in
protective enclosures. </font></li>
<li><font face="Arial" size="2">Centralized cabling design shall allow
for the addition and removal of horizontal and intrabuilding backbone
fibers.</font></li>
</ul>
<p><font face="Arial" size="2"><b>Recommendations</b></font></p>
<ul>
<li><font face="Arial" size="2">The addition and removal of horizontal
links should be performed at the telecommunications room. </font></li>
<li><font face="Arial" size="2">Slack may be stored as cable or
unjacketed fiber (buffered or coated). </font></li>
<li><font face="Arial" size="2">Cable slack may be stored within
enclosures or on the walls of the telecommunications room. </font></li>
<li><font face="Arial" size="2">The layout of both rack-mount and
wall-mount termination hardware should accommodate modular growth in
an orderly manner.</font></li>
</ul>
<blockquote>
<blockquote>
<p><font face="Arial" size="1">NOTE - Specifications on
pull-through implementations apply equally to all media types.
Cross-connects for different media types are required to be in the
same location.</font></p>
</blockquote>
</blockquote>
<p> </p>
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<td width="90%"><img border="0" src="../../images/arrow_up.gif" width="19" height="12"><b><font face="Arial" color="#008080" size="3">Centralized
optical fiber cabling </font></b><font face="Arial" size="3"><b><font color="#CCCC00">::</font></b></font></td>
<td width="10%">
<p align="right"><font face="Arial" size="3" color="#008080"><b>44/55</b></font></td>
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