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Product Description ADC’s Fiber Management Tray FMT series of fiber panels provides the kind of management necessary in today’s environment.. ADC’s FMT products provide bend radius prote

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Overview

Today’s optical transmission equipment can transmit astonishing amounts of data, video, or

telephone conversations Additionally, better technology has resulted in densely populated Fiber Optic Terminal (FOT) equipment frames These two factors added together make the fibers at the FOT very valuable However, up to now, the emphasis on managing these fibers has been minimal

In the past an equipment frame may have only accommodated a few fibers Now these frames commonly accommodate 20, 40, or even more than 100 fibers Consequently, quickly finding the right fiber to change service is not as easy as it used to be Searching for a fiber in a packed raceway increases the likelihood that service on an adjacent fiber is disturbed Thus, physical protection is mandatory for fibers entering and exiting the FOT

In addition to physical protection, increases in transmission speed require strict controls on a fiber’s bend radius Simply coiling a fiber and stuffing it into the vertical raceway makes it difficult to ensure

an appropriate bend radius Inducing a tight bend in a fiber may result in an attenuated signal, meaning bit errors, poor video quality, or dropped calls

Higher density and higher bandwidth dictate that complacency is no longer acceptable Avoiding service outages means managing and protecting fibers

Product Description

ADC’s Fiber Management Tray (FMT) series of fiber panels provides the kind of management

necessary in today’s environment This application note will discuss the features of the FMT panels and describe their use in real world applications

ADC’s FMT products provide bend radius protection and physical protection in a 1.75-inch high panel The FMT comes in several styles: storage, termination, termination/storage, and

termination/splicing/storage

The all-front-access trays feature sliding radius limiters for error-proof slack loop management and 30 mm bend radius protection within the tray Sliding adapter packs allow easy access for connecting jumpers and cleaning connectors, ensuring that any fiber can be installed or removed without inducing a macrobend on an adjacent fiber

The trays are lockable, further ensuring integrity of the fibers by greatly reducing the chance for accidents The FMT also provides a large blank label on the front of the drawer to easily

accommodate the office technician’s labeling needs By placing the label in this position, a

technician can glance over the termination assignments without even opening the drawer

Applications

Slack Storage at the FOT

An FOT frame may service dozens or even hundreds of fibers It is very difficult to determine an exact jumper length between the FOT and the fiber distribution frame (FDF) that will not result in slack somewhere in the path (see Figure 1) Even if the perfect length is determined, it is perhaps even

Fiber Management Trays

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more difficult to ensure that this jumper length is always in stock When an emergency arises, a

technician may have to use a longer jumper This will inevitably result in leftover slack that must be

stored and protected

In this scenario, there are two options: store the slack at the FDF or store it at the FOT Most FDFs do not accommodate equipment jumper slack very well Attempting to store slack at the FDF could congest cable management not intended for storing slack This is not an option in today’s world, in which high density

is the norm Congested cable management prematurely exhausts space needed for future fibers, thus

robbing the FDF of its true potential On the other hand, some FDF systems provide slack management features for FOT jumpers However, these solutions may be stand-alone panels that require additional floor space alongside the frame Some network planners are not willing to give up this floor space

The second and perhaps most economical method to store this slack is back at the FOT frame ADC’s

storage-only FMT occupies just 1.75-inches of rack mounting space The discrete storage drawer features

16 flip-up trays that can store between 1.7 and 2.5 meters of jumper slack, depending on the diameter of the jumper Each fiber is assigned its own tray and is easily accessible for service changes The bulk storage drawer, as shown in Figure 2, features bend radius limiters arranged in an open fashion, which allows

storage for a larger quantity of jumpers The bulk storage FMT provides up to 2.5 meters of slack for as many as (48) 2mm jumpers, fast becoming the standard jumper size in fiber networks Using two bulk storage FMTs, which are stackable, and 2mm jumpers, a technician can safely and cleanly store slack for up

to 96 jumpers in only two rack units

OSP

Cable

Splice

Protected by dedicated fiber protection system

Intrafacility Fiber Cable

Protected by overhead Fiberguide, Fiber Management System

Equipment Jumper

Connector Module

Connector Module

Interbay Management Panel Storage

Fiber Management Tray

Fiber Optic Terminal

Fiber Distribution Frame

Fiber Optic Terminal Bay

Fiber Entrance Cabinet

Figure 1

Figure 2

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Routing Multifiber Cables from the Network Element

Maintenance is a troubling issue resulting from the increase in fiber counts Moves, adds, or changes to service on a particular fiber may require working to access a long jumper in the overhead or under-floor fiber protection system This time-consuming task can require more than one technician, making

installation and maintenance costs a heavier burden than they need to be

Many network planners try to alleviate this problem by using multifiber cables as a means of connecting network elements to fiber distribution panels or frames This may be done within the confines of a Local Exchange Carrier’s network or when handing off service to a competitor located in a collocation cage This practice is also common at the customer premises, where several panels within the building are connected

to a main distribution frame The rationale behind this practice is that routing one cable through the office

is more cost-effective than routing potentially dozens of jumpers across this same space While this may be true, eventually the individual fibers need to break away from the outer cable jacket Providing adequate protection for these vulnerable fibers introduces a new problem Or, the cable may need to be spliced at the network element; finding a convenient place at which to protect and store the splice becomes an issue (see Figure 3)

OSP

Cable

Splice

Fiber Entrance Cabinet

Protected by dedicated fiber protection system

Intrafacility Fiber Cable

Connector Module

Connector Module

Interbay Management Panel Storage

Fiber Distribution Frame

Protected by overhead Fiberguide, Fiber Management System

Multi-fiber Cable Assembly Equipment Jumper

Fiber Management

Optic Terminal

Fiber Optic Terminal Bay

Figure 3

The FMT termination/storage panel is ideal for this application (see Figure 4) A multifiber cable can be

clamped to the equipment frame while the individual fibers are routed inside the FMT and protected by its bend radius limiters The termination/splicing/storage panel is ideal for situations in which a stubbed cable

is required Instead of routing a terminated cable through a riser, for instance, many installers feel that

using a stubbed cable eliminates the chance of breaking a connector while threading the cable through the conduit In this scenario the stub cable can be clamped to the equipment frame The individual fibers are then routed inside the FMT and spliced to factory-terminated and -loaded pigtails

The slack management spools provide another benefit Because of the range of slack that these spools can accommodate, a standard jumper length can be used to interface with any equipment chassis on

the frame This simplifies inventory management and makes services changes error-free The slack

management spools ensure that slack will be protected no matter how hastily a jumper is added when turning up new service

Figure 4

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

Web Site: www.adc.com

From North America, Call Toll Free: 1-800-366-3891 • Outside of North America: +1-952-938-8080 Fax: +1-952-917-3237 For a listing of ADC’s global sales office locations, please refer to our web site.

Conclusion

ADC’s Fiber Management Trays meet the need of today’s fiber optic networks As optical transmission speeds and fiber density increase, cable management becomes a crucial component in maintaining network integrity Excellent cable management practices and products allow service providers to offer highly reliable services, which is key to retaining current business as well as gaining additional business