Patent Publication Number: US-2011052133-A1

Title: Fiber organizer tray and telecommunications enclosure

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of U.S. Provisional Patent Application No. 61/238,450, filed Aug. 31, 2009, the disclosure of which is incorporated by reference herein in its entirety. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention is directed to a fiber organizer tray and a telecommunication enclosure, preferably a fiber distribution terminal, having one or more fiber organizer trays disposed therein, for managing telecommunication lines, especially optical fiber telecommunication lines, in a building or other structure. 
     2. Background 
     Several hundred million multiple dwelling units (MDUs) exist globally, which are inhabited by about one third of the world&#39;s population. Due to the large concentration of tenants in one MDU, Fiber-to-the-X (“FTTX”) deployments to these structures are more cost effective to service providers than deployments to single-family homes. Connecting existing MDUs to the FTTX network can often be difficult. Challenges can include limited distribution space in riser closets and space for cable routing and management. 
     Conventionally, a service provider installs an enclosure at a main access point in a building (often called a fiber distribution hub (FDH)) which couples service fibers to a riser cable that delivers the fibers to a terminal (known as a fiber distribution terminal (FDT)) installed on each floor, or every few floors, of an MDU or multiple tenant unit (MTU). The FDT connects the building riser cable to the horizontal drop cables which run to each living unit on a floor. The FDH enclosure is usually owned and installed by the service provider. 
     SUMMARY 
     According to an exemplary aspect of the present invention, a fiber organizer tray comprises a generally rectangular or oblong body having a first side and an opposite second side. The first side is configured to route and provide slack storage for a plurality of jacketed cables. The first side includes a winding cable guide that routes multiple jacketed cables a predetermined distance in a manner in which the multiple jacketed cables do not cross over themselves and do not experience a cable bend that violates a minimum bend radius of an optical fiber portion of the jacketed cable. 
     In another aspect, the second side is configured to route and splice a plurality of the jacketed cables to a plurality of optical fiber pigtails. In yet another aspect, the second side comprises a splice management insert configured to secure multiple splices formed between the optical fiber pigtails and the plurality of jacketed cables. 
     In another aspect, the fiber organizer tray further comprises an opening formed in the tray and within a portion of the winding cable guide that permits passage of the plurality of drop cables from the first side to the second side. 
     In another aspect, the fiber organizer tray further comprises a set of mounting arms extending from a hinge side of the tray configured to engage a mounting bracket. 
     In an alternative aspect, the second side comprises a winding cable guide that routes multiple jacketed cables a predetermined distance in a manner in which the multiple jacketed cables do not cross over themselves and do not experience a cable bend that violates a minimum bend radius of an optical fiber portion of the jacketed cable. 
     According to another exemplary aspect of the present invention, a telecommunication enclosure, comprises a housing, a distribution management unit disposed in the housing to access and terminate a plurality of distribution fibers, and a jacketed cable management unit disposed in the housing to organize and manage a plurality of jacketed cables to be connected to the plurality of distribution fibers, each jacketed cable including a jacketed portion that encloses an optical fiber therein. The jacketed cable management unit includes one or more fiber organizer trays hingedly coupled within the housing, wherein each of the one or more organizer trays is configured to route and provide slack storage for a plurality of jacketed cables. The fiber organizer tray includes a winding cable guide that routes multiple jacketed cables a predetermined distance in a manner in which the multiple jacketed cables do not cross over themselves and do not experience a cable bend that violates a minimum bend radius of the optical fiber portion of the jacketed cable. 
     In another aspect, the winding cable guide includes first and second entrances disposed on a hinge side of the organizer tray. 
     In another aspect, each of the one or more organizer trays includes a first side and an opposite second side, wherein the first side includes the winding cable guide and wherein the second side is configured to route and splice a plurality of the jacketed cables to a plurality of optical fiber pigtails. 
     In another aspect, the second side comprises a splice management insert configured to secure multiple splices formed between fiber pigtails and the plurality of jacketed cables. 
     In another aspect, the telecommunication enclosure further comprises a drop cable entry portion disposed in a wall of the housing and including a plurality of slots each populated with one or more cable entry devices to individually secure the plurality of jacketed cables. 
     In another aspect, the telecommunication enclosure further comprises a set of mounting brackets disposed in an interior portion of the housing, each of the mounting brackets configured to detachably and rotatably secure a mounting arm extending from a hinge side of the one or more organizer trays. In yet another aspect, each mounting arm comprises a pivot boss formed near an end portion thereof to be received by a correspondingly shaped receptacle formed on each of the mounting brackets. In another aspect, each of the one or more organizer trays includes stop members disposed inside the mounting arms to prevent excessive inward flexing of the mounting arms. 
     In another aspect, each of the one or more fiber organizer trays includes an opening formed in the tray and within a portion of the winding cable guide that permits passage of the plurality of drop cables from the first side to the second side. 
     In an alternative aspect, the splice management insert of at least one of the one or more fiber organizer trays receives at least one of a passive optical component and an active optical component. 
     The above summary of the present invention is not intended to describe each illustrated embodiment or every implementation of the present invention. The figures and the detailed description that follows more particularly exemplify these embodiments. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention will be further described with reference to the accompanying drawings, wherein: 
         FIG. 1A  is a top view of a telecommunication enclosure configured as a fiber distribution terminal according to an aspect of the present invention. 
         FIG. 1B  is a top view of a telecommunication enclosure configured as a fiber distribution terminal according to another aspect of the present invention. 
         FIG. 1C  is an isometric view of a drop cable management unit of a telecommunication enclosure configured as a fiber distribution terminal according to another aspect of the present invention. 
         FIG. 1D  is a top view of a splice side of an exemplary fiber organizer tray showing a splice side according to another aspect of the invention. 
         FIG. 1E  is a bottom view of the exemplary fiber organizer tray of  FIG. 1D  showing the slack storage side according to another aspect of the invention. 
         FIG. 1F  is an isometric view of a distribution management unit of a telecommunication enclosure configured as a fiber distribution terminal according to another aspect of the present invention. 
         FIG. 2A  is an isometric view of a first side of an exemplary fiber organizer tray according to another aspect of the present invention. 
         FIG. 2B  is another isometric view of a second side of an exemplary fiber organizer tray according to another aspect of the present invention. 
         FIG. 3  is schematic view of an exemplary multi dwelling unit in which the telecommunication enclosure according to aspects of the present invention can be utilized. 
     
    
    
     While the invention is amenable to various modifications and alternative forms, specifics thereof have been shown by way of example in the drawings and will be described in detail. It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the invention as defined by the appended claims. 
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     In the following Detailed Description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as “top,” “bottom,” “front,” “back,” “leading,” “forward,” “trailing,” etc., may be used with reference to the orientation of the Figure(s) being described. Because components of embodiments of the present invention can be positioned in a number of different orientations, the directional terminology is used for purposes of illustration and is in no way limiting. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims. 
     The present invention is directed to a fiber organizer tray and a telecommunication enclosure that includes the fiber organizer tray. The fiber organizer tray provides slack storage for jacketed cables, such as drop cables, that are routed thereon. In addition, the fiber organizer tray can further provide for splicing of the jacketed cables to optical fibers, such as optical fiber pigtails, on an opposite side of the tray. In a preferred aspect, the fiber organizer tray is implemented within a telecommunication enclosure that is configured as a fiber distribution terminal (FDT) for managing telecommunication lines, especially optical fiber telecommunication lines, in a building, such as an MDU or other location. While the embodiments herein are described with respect to an FDT implementation, the fiber organizer tray can be implemented in a telecommunication enclosure that can be configured as a different type of device, such as a fiber distribution hub (FDH) or a building entrance terminal (BET) for a small building. In addition, although the aspects described herein are directed to cables having optical fibers, the telecommunication enclosure of the present invention can also accommodate implementations that utilize hybrid and electrical cables. 
       FIGS. 1A-1B  show top views and  FIG. 1C  shows a partial isometric view of a telecommunication enclosure that includes one or more exemplary fiber organizer trays. In particular, the telecommunication enclosure of  FIGS. 1A-1B  is configured as a fiber distribution terminal (FDT)  100  having a fiber organizer tray  150 , whereas  FIG. 1C  shows FDT  100  as including fiber organizer trays  150   a  and  150   b . Close-up views of exemplary fiber organizer tray  150  are provided in  FIGS. 1D ,  1 E,  2 A and  2 B. 
     In one aspect,  FIGS. 2A and 2B  show isometric views of an exemplary fiber organizer tray  150 . The fiber organizer tray  150  has a generally rectangular or oblong body having a first side  160  ( FIG. 2A ) and an opposite second side  180  ( FIG. 2B ). The fiber organizer tray  150  is preferably formed from a rugged material, such as rigid plastic or metal. The first side  160  is configured to route and provide slack storage for a plurality of jacketed drop cables received on the tray. In particular, first side  160  (also referred to herein as slack storage side  160 ) comprises a winding or switch-back shaped cable guide  165  (referred to herein as serpentine cable guide  165 ). 
     Serpentine cable guide  165  has a square-well shaped cross-section and is configured to route multiple jacketed cables a predetermined distance on the tray  150  in a manner in which the multiple jacketed cables do not cross over themselves and do not experience a cable bend that violates a minimum bend radius of the optical fiber held within the jacketed cable. The path of serpentine cable guide  165  has multiple bends and traverses a substantial portion of side  160 , and is not limited to the perimeter portions of side  160 . The serpentine cable guide  165  does not have a conventional “figure-8” shape, which leads to jacketed cables crossing over themselves. In addition, the path of serpentine cable guide  165  allows jacketed cables to be routed with minimal-to-no twisting placed on the jacketed cables disposed on the fiber organizer tray  150 . In addition, serpentine cable guide  165  guides the jacketed cables so that they can enter and exit along the hinge side  151  of fiber organizer tray  150 . In this manner, as will be more apparent in the context of the example implementations described herein, the tray  150  can be rotated on its mount (see e.g.,  FIG. 1C ) without placing an additional pulling force on the jacketed cables and without having the jacketed cables themselves limit rotation of an installed fiber organizer tray by entering/exiting the tray over other perimeter sides of the tray. 
     A shown in  FIG. 2B , in a preferred aspect, the second side  180  of fiber organizer tray  150  is configured to route and splice a plurality of the jacketed cables to a plurality of optical fiber pigtails. The second side  180  can comprise a splice management insert  190  configured to secure multiple splices formed between optical fiber pigtails and the plurality of jacketed cables. Additional fiber routing structures  185  can also be included on splice side  180  to help contain and direct the fiber pigtails and jacketed cable fibers routed thereon. One or more drop cable retainers  186  cab also be provided on tray side  180  to help secure the jacketed cables. In addition, side  180  can also include one or more spools  182   a ,  182   b  to store and direct/redirect optical fibers spliced thereon. 
     In addition, fiber organizer tray  150  can include an opening, such as opening  169 , formed in the tray  150  and within a portion of the winding cable guide  165  that permits straightforward passage of the plurality of jacketed cables from the first side  160  to the second side  180 . 
     Further, as is shown in  FIGS. 2A and 2B , the fiber organizer tray includes a set of mounting arms  157  extending from the hinge side  151  of the tray  150  that are configured to engage a mounting bracket formed in a telecommunication enclosure (described below). 
     In an alternative aspect, for some implementations, a fiber organizer tray having opposite sides with each side including a serpentine cable guide can be implemented. In a further alternative aspect, the first side can be implemented with a serpentine cable guide as is described above and the second side can be devoid of either slack storage or splicing features. 
     Further features of the exemplary fiber organizer tray  150  will be described more fully below in the context of an example FDT implementation. 
     Referring to  FIGS. 1A-1C , an exemplary telecommunication enclosure comprises FDT  100 . FDT  100  can be mounted at a utilities access point, such as a telecommunication closet, in a building or other structure (see e.g.,  FIG. 3 , which shows an exemplary building or MDU  10 ). FDT  100  can route distribution telecommunication lines, such as multiple distribution optical fibers, originating from a telecommunication service provider to individual customers living or residing within the building. FDT  100  comprises a housing or chassis  101  or other ruggedized structure that includes two distinct compartments—a distribution management unit  110  and a jacketed cable management unit  130 . This compartmentalization of telecommunication line management provides for the separation of service craft. An overall cover to fully enclose chassis  101  can also be provided, but is not shown for simplicity. 
     In one aspect, the FDT  100  can be mounted on a wall or other generally flat surface or it can be mounted within an equipment rack. In another aspect, a wall mount bracket (not shown) with connection to ground can be provided to support FDT  100 . In a further aspect, a folding work tray (not shown) can be mounted onto chassis  101  and/or stored behind the FDT  100  to provide a work bench or support for telecommunication equipment, such as a fusion splicer, often used during installation or repair. 
     In this exemplary aspect, distribution management unit  110  is configured to receive distribution fibers via a riser cable (see e.g., riser cable  25  shown in  FIGS. 1F and 3 ) that can enter and exit FDT  100  via ports  115   a  and  115   b . The multiple distribution fibers (in this specific example, 36 distribution fibers) can be accessed from the riser cable  25  using a window cut  26  (see  FIG. 1F ). The distribution fibers (not shown) can be pulled from the riser cable  25  and terminated at the cross connect field  120 . The termination can be performed as a direct fiber termination to a cross connect field  120  (via, e.g., a conventional field mount connector) or, alternatively, through splicing the distribution fibers to fiber pigtails (not shown) which are coupled to the cross connect field  120 . A splice tray for splicing the distribution fibers to pigtails can be located within the distribution management unit  110  underneath plate  111 . As shown in  FIG. 1F , one or more splice trays  118  can be utilized to hold the multiple splices made to the distribution fibers. A commercially available splice tray, such as a 2524-SR fiber splice tray, available from 3M Company, St. Paul, Minn., can be utilized. Alternatively, the distribution management unit  110  can utilize one or more fiber organizer trays  150  disposed therein. 
     Cross connect field  120  includes one or more rows (as shown in  FIGS. 1A and 1B , first and second rows  122   a ,  122   b ) of couplers or adapters  124 , with each coupler/adapter connected to a single distribution fiber (this connection is not shown for simplicity). These couplers/adapters  124  can also be accessed by terminated fiber drops originating from the jacketed cable management unit  130 , described in further detail below. Each coupler/adapter  124  can be configured to receive a pair of standard optical fiber connectors, such as SC-type and/or LC-type connectors. In a preferred aspect, cross connect field  120  is supported by plate  111 . 
     Once the connection of distribution fibers to the cross connect field  120  is completed, the plate  111  can be rotated from an open position ( FIG. 1F ) to a closed position ( FIGS. 1A and 1B ) and secured via a locking mechanism  112  such that distribution connections can be protected from unwanted access. As would be apparent to one of skill in the art given the present description, the communications enclosure/FDT  100  is not limited to an enclosure servicing  36  service lines and customers—the communications enclosure/FDT  100  can be modified to accommodate fewer numbers (e.g., 6, 12, 18, 24 lines) or greater numbers (e.g., 42, 48, 54, 60 lines) of service lines/customers, as is needed. In a preferred implementation, the process of fully preparing the distribution management unit  110  of FDT  100  can be completed during installation of FDT  100 . 
     FDT  100  further includes a jacketed cable management unit  130  that is configured to receive, route, and manage a plurality of individual jacketed cables, such as drop cables, connecting the FDT  100  to individual service customers/building occupants. In a preferred aspect, the jacketed cable management unit  130  includes one or more fiber organizer trays  150 , such as those described above. 
     Individual drop cables, such as drop cable  132  (see FIGS.  1 A- 1 B—only one drop cable is shown for simplicity), are received at jacketed cable entry portion  140 . In a preferred aspect, jacketed cable entry portion  140  comprises a plurality of slots each populated with one or more cable entry devices such as those described in the U.S. Provisional Patent Application No. 61/238,273, incorporated by reference herein in its entirety. These cable entry devices can include multiple individual ports to receive individual drop cables, such as pre-terminated drop cables, and can provide strain relief against inadvertent pulls made on the drop cables. Alternatively, the drop cable entry portion  140  can comprise a conventional multiport grommet. 
     Each drop cable  132  can be secured and routed within FDT  100  via cable retention structures  136  such as shown in  FIGS. 1A-1B . An exemplary drop cable  132  utilized herein comprises a conventional 3 mm jacketed cable that includes a 900 μm or 250 μm buffer coated optical fiber, commercially available from a variety of sources. In an alternative aspect, drop cable  132  can comprise a drop cable having a rectangular cross section, conventionally referred to as an FRP cable. 
     As mentioned above, each organizer tray  150  includes a first side  160  and a second (opposite) side  180 . In a preferred aspect, the first side  160  and the second side  180  each have a different fiber/cable management function.  FIGS. 1A and 1B  show FDT  100  as having a single organizer tray  150  in two different installed orientations (in the example for 36 drop cables, the two other organizer trays are omitted for simplicity) and  FIG. 1C  shows FDT  100  as having two organizer trays  150   a  and  150   b  (in the example for 36 drop cables, the third organizer tray is omitted for simplicity), with tray  150   b  placed in a normal use position and tray  150   a  rotated in a non-use position. 
     As explained in further detail below with respect to  FIGS. 1A and 1B , fiber organizer tray  150  can be used in multiple implementations within a telecommunication enclosure, such as to accommodate pre-terminated drop cables and to accommodate drop cables to be connectorized or spliced within the enclosure. 
       FIG. 1A  shows one example implementation where pre-terminated (or field connectorized) drop cables  132  are being connected to distribution fibers via FDT  100 . Fiber organizer tray  150  includes a first side  160  that is configured to route and provide slack storage for a plurality of drop cables (only drop cable  132  is shown for simplicity). First tray side  160  (also referred to herein as slack storage side  160 ) faces upward and comprises a winding or switch-back shaped cable guide  165  (referred to herein as serpentine cable guide  165 ). As mentioned above, serpentine cable guide  165  is configured to route multiple jacketed drop cables (in this example, each tray can accommodate up to twelve (12) 3 mm jacketed drop cables) a predetermined distance on the tray  150  in a manner in which the multiple drop cables do not cross over themselves and do not experience a cable bend that violates a minimum bend radius of the drop cable. 
     As is also shown in  FIG. 1A , drop cable  132  installed in serpentine cable guide  165  experiences multiple bends and traverses a substantial portion of side  160 . When multiple drop cables are disposed in serpentine cable guide  165 , the cables are not forced to cross over themselves. In addition, the path of serpentine cable guide  165  allows drop cables  132  to be routed with minimal-to-no twisting. Also, serpentine cable guide  165  guides the drop cables  132  so that they enter and exit along the hinge side  151  of organizer tray  150 . In this manner, the tray  150  is rotatable on its mount (see  FIG. 1C ) without placing an additional pulling force on the drop cables  132  and without having the drop cables  132  themselves limit rotation of the organizer tray  150  by exiting the tray over other perimeter sides of the tray. 
     In the example of  FIG. 1A , a terminated drop cable  132  can have a standard connectorized end (e.g., SC connector  138 ) that is field mounted or already terminated onto e.g., a stripped portion  133  of drop cable  132 . The connector  138  can be received by an appropriate coupler  124  of the cross connect field  120 . The drop cable  132  enters/exits the slack storage side  160  via a first entrance  167   a  (located on hinge side  151 ), is routed through a length of tray side  160  via serpentine cable guide  165 , and exits/enters the slack storage side  160  via a second entrance  167   b  (also located on hinge side  151 ). An additional drop cable entrance/exit  167   c  can be provided on slack storage side  160  to be utilized in other cable routing applications. Several tabs  168  are provided on serpentine cable guide  165  and overhang portions of the guide to help retain the drop cables routed within. The exiting drop cable  132  is further secured within the main structure of FDT  100  and routed to the cable entry portion  140  via cable retention structures  136 . 
     Thus, for applications where pre-terminated drop cables are being connected to the service provider distribution lines, only slack storage side  160  of organizer tray  150  need be utilized. For such applications, in further alternative aspects of the invention, the telecommunication enclosure can include a fiber organizer tray that is configured to route and provide slack storage for a plurality of drop cables using a serpentine cable guide—the opposite side of the fiber organizer tray can also be configured to contain a serpentine cable guide of similar shape or it can be devoid of structure as no splicing of the drop cables is required. 
       FIG. 1B  shows another example implementation of organizer tray  150 , where drop cables  132  are being spliced to fiber pigtails and connected to distribution fibers via FDT  100 . Fiber organizer tray  150  includes second side  180  that is configured to route and splice a plurality of drop cables (only drop cable  132  is shown for simplicity) to a plurality of optical fiber pigtails (only one optical fiber pigtail  134  is shown for simplicity). As shown in  FIG. 1B , second tray side  180  (also referred to herein as splice side  180 ) faces upward and comprises a splice management insert  190  that is configured to secure multiple splices  192  formed between fiber pigtails  134  and drop cables  132  (in this example, up to 12 splices can be secured to splice insert  190 ). 
     The splice management insert  190  is configured to support mechanical and/or fusion splices made to the fiber ends. In one aspect, splice management insert  190  can comprise a number of resilient clips or other holders  191  (see  FIG. 2B ) designed to hold one or more mechanical splices, such as 4×4 FIBRLOK™ splices (commercially available from 3M Company, St. Paul Minn.). Alternatively, holders  191  can be configured to hold one or more fusion splices. The splice management insert  190  can be formed as an integral portion of tray or it can be removable. Alternatively, the splice side  180  can be formed with appropriate receptacles to receive different splicing inserts that can be mounted to the splice side  180  of organizer tray  150 , depending on the application (e.g., an insert configured to support one or more fusion splices, or a different insert to support one or more mechanical splices). In a further alternative, one or more of the trays  150  described herein may also hold passive and/or active optical components, as well as splices. In one alternative example, the splicing insert of the organizer tray  150  can house a splitter. In further alternatives, splice side  180  may be configured to hold or secure one or more of 1×N fiber optic splitters, 2×N fiber optic splitters, WDM components, CWDM components, switches, and/or other optical components combinations thereof. 
     The splice side  180  of tray  150  also includes first and second fiber spools  183   a ,  183   b  disposed on either side of splice management insert  190  for slack storage or redirection of the fiber pigtail  134  and the stripped portion  133  of drop cable  132 . Additional fiber routing structures  185  can also be included on splice side  180  to help contain and direct the fiber pigtails  134  and drop cable fibers  133 . One or more drop cable retainers  186  are also provided on tray side  180  to help secure the drop cables  132 . 
     In the example of  FIG. 1B , a fiber pigtail  134  can have a standard connectorized end (e.g., SC-type connector  138 ) that is received by an appropriate coupler  124  of the cross connect field  120 . The pigtail  134  enters/exits the splice side  180  via a first entrance  187   a  (located on hinge side  151 ). Pigtail  134  can be spooled (if necessary) by spool  183   b  to store an appropriate amount of excess fiber. The splice  192  made between fiber pigtail  134  and drop cable fiber  133  can be mounted on splice insert  190 . The drop cable fiber  133  can be spooled (if necessary) by spool  183   a . The drop cable  132  is secured by retainer  186  and is further guided about a portion of splice side  180  via routing structures  185  to an opening  169  formed in the tray that permits the drop cable  132  to transition from the splice side  180  to the slack storage side  160 . 
     The tray features employed when drop cables  132  are being spliced to fiber pigtails  134  are further illustrated with respect to  FIGS. 1D and 1E . In particular, the orientation of organizer tray  150  as shown in  FIG. 1D  is the same as that shown in  FIG. 1B .  FIG. 1E  thus shows the slack storage side  160  when viewing tray  150  from underneath the tray as it is installed. In  FIG. 1D , using entrance  187   a  as a starting point for illustration purposes only, fiber pigtail  134  having a connector  138  (that is received by an appropriate coupler  124  as shown in  FIG. 1B ) enters/exits the hinge side  151  of tray  150  onto the splice side  180  via a first entrance  187   a . The pigtail  134  is spooled by spool  183   b  and directed to the splice insert  190 , where the splice  192  between optical fiber pigtail  134  and drop cable fiber  133  is held in place. The drop cable fiber is guided about a portion of splice side  180  via spool  183   a  to the drop cable retainers  186 . The drop cable  132  is further guided via routing structures  185  to the opening  169 , where drop cable  132  passes from the splice side  180  to the slack storage side  160  of tray  150 . 
     As is shown in  FIG. 1E , the spliced drop cable  132  can be further routed from the opening  169  via serpentine cable guide  165  to fiber entrance  167   a . The spliced drop cable  132  can be secured within the main structure of FDT  100  and routed to the cable entry portion  140  via cable retention structures  136  (in a manner similar to that shown in  FIG. 1B ). 
     Tray  150  can be mounted within FDT  100  via a set of mounting brackets  135  (see  FIGS. 1A-1C ) disposed within chassis  101  to provide an offset, stacked organizer tray arrangement. Mounting brackets  135  receive pivot bosses  159  formed near the ends of mounting arms  157  of tray  150 . The pivot bosses engage with correspondingly shaped receptacles (not shown) permitting (upward/downward) rotation of the organizer tray  150 . Mounting arms  157  are preferably constructed from a rigid material that also permits some modest flexing at the outer ends to allow straightforward attachment to the mounting brackets  135 . Stops  158  can also be provided on tray  150  to prevent excessive inward flexing of the mounting arms  137  that may damage the arms after repeated flexing. In alternative aspects, the attachment of the trays to the chassis may be modified, as would be apparent to one of ordinary skill in the art given the present description. With this construction, organizer tray  150  can be inserted in two different orientations within FDT  100 , one orientation with slack storage side  160  facing upwards (see  FIG. 1A ) or another orientation with splice side  180  facing upwards (see  FIG. 1B ). This overall system flexibility allows FDT  100  to be utilized in several different applications, as is described above. 
     In the example shown in  FIG. 1C , the tray  150   a  is rotated 90° with respect to tray  150   b . In this manner, a technician can access either side of tray  150   a ,  150   b  during installation, customer hookup/disconnection or repair. In addition, each tray  150  may further include a tab  153  or similar structure that engages a tray retention structure  139  formed in the chassis to secure the tray  150  in its “in use” position and prevent inadvertent rotation of the tray. Other retention structures may also be utilized. 
     Also, the drop cables and/or pigtails enter/exit organizer trays  150  via hinge side  151 , thus reducing the risk of unwanted pulls being placed on the fibers during installation and repair processes. Although not shown, jacketed cable management unit  130  may further include a movable cover or plate that is closed and secured when an installation, customer hookup/disconnection or repair process is completed, in a manner similar to that with the distribution management unit. 
       FIG. 3  shows an example a multi-dwelling unit (MDU) or building  10  having a fiber distribution hub (FDH) as well as a fiber distribution terminal (FDT). The MDU  10  is a multi-floor structure having a plurality of living units  2  located on each floor thereof. One example floor  1  has four living units  2  having a common hallway  3 . 
     A feeder cable  5  brings communications lines to and from building  10 . These communications lines are spliced to building feeder lines  15  of the MDU cabling at a splice closure  12 . The building feeder lines  15  are distributed to the building from the FDH  20  through riser cables  25  which run to the FDTs  30  located on each floor of the MDU  10  (in some buildings FDTs are placed on every other floor). Exemplary strain relief devices, such as those described in the U.S. Provisional patent application Ser. No. 12/238,273, cited above, can be used to secure the riser cables  25  in the entrance (exit) portion of the FDH  20 . Additionally, exemplary strain relief devices may be used as cable entry portions (see exemplary cable entry portions  140  described above) in the FDTs  30  on each floor to secure the telecommunication drop cables  35  that exit the FDT and run to each living unit  2 . Alternatively, in a direct run architecture, all of the telecommunication drop cables may run from the FDH to the individual living units on each floor of the MDU. Thus, the exemplary telecommunication enclosures  100  described above can be utilized as either an exemplary FDH or FDT in this exemplary MDU. 
     Thus, the telecommunication enclosure and fiber organizer trays described herein can be utilized in multiple telecommunication service functions for MDUs or other buildings, such as FDT implementations and FDH implementations. 
     The present invention should not be considered limited to the particular examples described above, but rather should be understood to cover all aspects of the invention as fairly set out in the attached claims. Various modifications, equivalent processes, as well as numerous structures to which the present invention may be applicable will be readily apparent to those of skill in the art to which the present invention is directed upon review of the present specification. The claims are intended to cover such modifications and devices.