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Wireless Switching
Office Fiber Cable Management
The Advantage of
Wireless Switching
Office Fiber Cable Management
Fiber is on the increase within wireless switching centers as they evolve to meet
rising bandwidth demand, requiring modifications to the traditional wireless
switching office. With any increase in fiber, developing and maintaining good
fiber cable management quickly becomes an important consideration. As wireless
switching centers – we’ll refer to them as mobile switching centers (MSCs) in this
paper – are being retrofitted to increase density and capability, a good fiber cable
management system ensures quality-of-service is maintained.
With many years of experience in many unique situations, ADC has long been
preaching the message of proper cable management techniques – and the
company’s products reflect the same philosophy. That message is becoming more
applicable in today’s wireless world. With much more fiber and copper cabling
being required in MSCs, cable management has become a critical issue. Any
high-density distribution frame must be functionally designed to accommodate
the large numbers of incoming and outgoing cables and patch cords.
ADC’s four elements of fiber cable management – bend radius protection, cable
routing paths, cable access, and physical protection – are absolutely applicable in
today’s wireless MSCs. The differences between an MSC, a typical central office
(CO), large enterprise data centers, and even a cable television environment are
beginning to blur. With those lines blurring and competition among the different
service providers intensifying, maintaining a good cable management system
becomes much more critical for maintaining QoS and a competitive advantage.
Blurring the lines
Convergence within an MSC basically refers to the migration from packet
switching to Internet protocol (IP) switching. Since this is taking place at the
active equipment level to achieve standardized data transmission, the physical
architecture between a multiple service operator (MSO), regional Bell operating
company (RBOC), large data center, and wireless operator is becoming very similar.
Page 3
Wireless operators have experienced tremendous
growth in the last few years, creating an almost chaotic
environment in which upgrading and building new MSCs
has taken on a sense of urgency. Unprepared for such
rapid growth, many wireless providers are racing to meet
capability goals without giving much thought to future-
proofing their network – particularly within the MSC. In
other words, the emphasis is typically on meeting the
“now” without worrying about the “tomorrow.” This
could be a costly business strategy when it comes time
for any future upgrades.
For example, during the initial installation of a high
density optical distribution frame (ODF) line-up in an
MSC, a service provider may install only two or three
frames at first, planning for more in the future. A
six-inch overhead. A six-inch overhead raceway may
provide adequate capacity to handle in-coming patch
cords. However, as the addition of more ODF’s becomes
necessary, the six-inch raceway will lack the capacity to
adequately service the additional frames.
Installing 24-inch raceways from the beginning will
enable enough patch cord capacity for additional ODFs
without a complete overhaul. In other words, saving
initial costs by using smaller, less expensive raceways in
the beginning is only deferring future retrofit costs that
will likely be much higher in terms of product, time, and
manpower. ADC data suggests those retrofit costs could
be two to three times the cost of the original raceways to
handle additional cabling. Future-proofing the raceways
will eliminate the operational risk incurred by physically
handling all the fiber.
Value-added modules
A second significant issue facing wireless operators is the
ability to monitor fiber traffic. As wireless carriers migrate
to universal mobile telecommunication system (UMTS) or
3G technologies, much of their traditional copper-based
network is transitioning to fiber. Using copper gave them
circuit access through a digital signal cross-connect (DSX),
which enabled them to simply plug in a portable test
set and non-intrusively monitor traffic over the network.
However, much of the UMTS active equipment lacks that
type of access.
To compensate, many UMTS operators are electing to use
Value-Added Modules (VAMs). These are basically optical
90/10 splitters that provide access for monitoring traffic
by leveraging an overhead signal on the network. At
the same time, VAMs provide easy demarcation points.
As other fixed-line carriers connect to the network, the
VAM peels off 10% of the signal onto one output and
the other 90% continues down the network through the
other output.
At demarcation points, the VAMs clearly identify where
the signal is being handed off and who is responsible
for the physical plant from that point on. In the event
of a problem, technicians can proceed directly to the
demarcation point and non-intrusively observe both
directions to determine if the problem is on their end or
the other carrier’s end. The VAM segments the network
and provides faster troubleshooting and maintenance
capability, as well as allowing for quicker assignment of
responsibility.
Elements of cable management
Maintaining QoS standards in wireless MSCs requires
adhering to the same elements of cable management
found in an efficient wireline CO. The migration of
MSCs to a primarily fiber environment requires wireless
operators to utilize functional high-density optical
distribution frames that address good cable management
for quick and efficient turn-up, test, and reconfiguration.
The first element is to employ proper bend radius
protection, ensuring the fiber runs as defined in Telcordia
GR-449-CORE, Issue 2. This standard states that all fiber
within the network needs to be protected with a radius
of 1.5 inches or 10 times the outside diameter (OD) of
the cable, whichever is greater. This protection is critical
for long-term optical performance and the support of
future high-speed services.
Secondly, the MSC requires clear cable routing paths that
allow every fiber to be followed along its particular path.
As fiber counts in the MSC continue to increase, the need
to easily follow cable routing paths is magnified. ADC
has developed many products that make the difference
between neatly routed, easily accessed patch cords and
congested chaos.
For example, ADC’s TracerLight
®
Patch Cords provide
LEDs at both ends of the cable. The technician plugs into
the LED at one endd for easy and effective identification.
With this technology, technicians can be absolutely
certain they are removing the correct patch cord and
decrease service interruptions caused by human error.
Another ADC product designed for ensuring clear
cable routing on the active equipment is RiserGuide.
Resembling a peg board, this product can be installed
next to a rack of OEM equipment to control bend radius
on fiber entering and exiting the equipment. Fiber
pathways can also be created vertically along the side of
the active equipment rack. In the past, when about 50
fibers exited a particular cabinet, MSCs had little need
to be concerned about fiber routing and management.
But with tremendous increases in densities within today’s
active equipment world, these racks and cabinets now
use upwards of 400 or 500 fibers and patch cords – and
proper routing becomes a more pressing issue.
Wireless switching office fiber cable management
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ADC Telecommunications, Inc., P.O. Box 1101, Minneapolis, Minnesota USA 55440-1101
Specifications published here are current as of the date of publication of this document. Because we are continuously
improving our products, ADC reserves the right to change specifications without prior notice. At any time, you may
verify product specifications by contacting our headquarters office in Minneapolis. ADC Telecommunications, Inc.
views its patent portfolio as an important corporate asset and vigorously enforces its patents. Products or features
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Thirdly, technicians must have easy access to any cable for troubleshooting, monitoring, or maintenance
of the network. Tool-less access to both front and rear connectors without disturbing adjacent fibers or
connectors helps accomplish this goal. The VAMs also play a critical role in enabling non-intrusive access
at demarcation points and on the ODFs,
The final element of proper cable management is physical security and safety. Obviously, the less each
fiber or patch cord is physically moved and manipulated, the less chance of creating any physical damage
problems. With proper labeling, record keeping, and routing, technicians can locate a particular cable
without risking damage to another.
Conclusion
It cannot be overstated that new fiber-rich wireless MSCs will require good fiber cable management to
enable a smooth, future-proof migration to UMTS and IP technologies. Proper care and planning will
provide additional benefits to the carrier – including maximizing operational efficiency, enabling easy
access, achieving high flexibility, and lowering the total cost.
ADC’s complete line of cable management products has been perfected over years of field testing in
facilities worldwide. Constant innovation and successful implementation has earned ADC a reputation
as the “go-to guys” of end-to-end cable management. For the wireless carriers, this equates to an MSC
that will serve the network well into the future.
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. PAPER
Wireless Switching
Office Fiber Cable Management
The Advantage of
Wireless Switching
Office Fiber Cable Management
Fiber is on the increase within wireless. within wireless switching centers as they evolve to meet
rising bandwidth demand, requiring modifications to the traditional wireless
switching office.
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