Information Technology Reference
In-Depth Information
Multi-user telecom.
outlet assy. (MUTOA)
Horizontal
cross-connect
Telecommunications
closet
User cords
20 m max
Work area
Horizontal cabling
FIGURE 10.4
MUTOA method.
It is well established, and is included in the component standard, that the
stranded-conductor cable used for user and patch cords has a lower velocity of
propagation and higher losses than the solid-conductor cable of the horizontal runs.
This TSB utilizes that effect in determining how much to decrease the horizontal
cable allowance as the user cord is lengthened. This de-rating factor turns out to be
a very good approximation of how much the link performance is degraded by
unusually lengthy user cords.
These long user cords can be threaded through the modular furniture raceways
in much the same way that the unterminated horizontal cable was in the consolida-
tion method. The cable raceways in modular furniture normally have removable
panels along their length, so the only difficulty is to run the connectorized cable ends
through the openings in the structural columns placed for this purpose. Care should
be exercised in this process, as there is ample opportunity to bend, kink, or cut the
cable during the installation into modular furniture. Some of these removable pan-
els are constructed of metal, so the installer must also be cautious of sharp edges.
Also, the electrical power to the module should be turned off for safety reasons dur-
ing the installation of cable in the module.
Note that there is no workstation outlet in the normal area of the workstation.
The work area outlet is in fact part of the multiuser outlet assembly that serves all
the nearby modules. The extended user cord is run through the modular furniture
and plugged directly into the user workstation.
Excess User Cord Length. The other issue that must be dealt with is the excess
cable that will be left over. Unlike horizontal cable, which must be trimmed to within
18 in of excess cable at the workstation outlet, the user cords are normally fixed-
length, manufactured cords. Category 5e or 6/AC6 field termination of stranded
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