How patch cord
should be routed.
The object of routing a patch cord through horizontal and vertical
managers is to route the cord in such a fashion that will eliminate
or minimize the #1 contributor to poor patch-cord management, SLACK.
Since you cannot purchase the exact length cord for each patch,
you must purchase longer cords to give you the flexibility needed
for moves, adds, or changes.
Although routing a patch cord to eliminate or minimize slack seems
like a simple concept, it does not work. For this method to work
and to minimize the slack of the cord it would require the end user
to possibly figure out a new route each time a cord is patched.
It's like reading a map. You would have to look at the wire manager's
routes, and the patch- cord length, see that if you were to route
it through this horizontal manager, then take it down these vertical
managers, to see that you would end up with very little slack when
the patch is completed, or to see if another route would be better.
See what I mean!
How a patch cord
is really routed.
Even with horizontal and vertical managers on each side of a patch
panel or hub, the patch cord follows the path of least resistance,
just like electricity. The cord enters the horizontal manager adjacent
to the patch panel, whips over to the immediate vertical manager,
and travels down the verticals to the horizontal manager adjacent
to the hub. Boom, the patch is complete! (See fig. 1.) This leaves
a preponderance of slack in one section of the management system
(an Achilles' heel). This slack builds and builds as each cord is
patched. (See fig. 2.) This will cause an overflow condition in
the mangement system resulting in poor patch-cord management. You
all know what I mean - a rat's nest, jungle, cluster****, or spaghetti.
|
In an
industry study "The reality of patch-cord management"
published in Cabling Installation and Maintenance magazine
(Feb. 97) the finding revealed that 93% of all patch cords
exhibit unacceptable slack. More astonishing was the average
amount of slack per patch cord: a whopping 20 inches.
Multiplied by 187
(the average number of patch cords per Cross-connect under
study), that comes to 312 feet - longer than a football
field. This accumulated slack hangs in disarray, affecting
channel performance, manageability, aesthetics, and bend
radius stability. |
|
PerfectPatch-Cord
Management News
Dennis
W. Mazaris, RCDD, Editor
Email
43766 Trade Center Place, Suite 130
Dulles, Virginia 20166
703-796-5408
www.perfectpatch.com
|
|
Next
Issue
Providing a measurable performance level in a patch-cord management
system |
|
|