Abstract:
A cable management cabinet is improved by separately managing the routing of data copper cables and optical fiber cables within the cabinet. This is accomplished by providing separate cable retaining boxes (CRBs) for data copper cables and optical fiber cables respectively. The CRBs are provided with front openings to facilitate installation and routing of optical fiber cables and data copper cables. The openings may be provided with edge guards to ease ingress/egress of cables through the openings.

Description:
RELATED APPLICATIONS 
       [0001]    This application is related to U.S. patent application Ser. No. 12/658,461, filed Feb. 11, 2010, which application is incorporated here by reference. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The invention described and claimed in this application relates to cabinets for storing, routing and interconnecting optical fiber cables and data copper cables, and related optical system devices and modules. 
       BACKGROUND OF THE INVENTION 
       [0003]    It is common practice at central switching offices and other interconnection facilities to contain fiber optic and wire cables in protective troughs suspended horizontally above routers or other equipment where the cables terminate. Cables associated with a given piece of equipment are allowed to drop a certain distance in an exposed state from the trough above the equipment, and to enter cable ports of the equipment. Thus, if a new cable must be connected to equipment in addition to existing connected cables, it is not uncommon to lash the new cable to the existing cables where exposed so as to provide the new cable with ample support. It will be appreciated, however, that such lashing can disturb the orientation of the existing cables and increase signal attenuation within the cables, especially if the cables are disturbed near their associated equipment ports. 
         [0004]    It is known generally to attach a so-called vertical cable management trough to either side of a router to contain cables that run next to the router. See, Cisco Systems, Inc., Model XR 12416 and XR 12816 Router Chassis Installation Guide (March 2009), at pages 3-23 and 3-24. So-called inter-bay fiber management assemblies are also known that are constructed to contain and manage the routing of fiber optic cable at different levels or bays of an equipment rack, or the bays of two adjacent equipment racks. See U.S. Pat. No. 6,541,705 (Apr. 1, 2003), U.S. Pat. No. 6,571,047 (May 27, 2003), U.S. Pat. No. 6,845,206 (Jan. 18, 2005), and U.S. Pat. No. 7,437,048 (Oct. 14, 2008). See also, ADC Telecommunications, Inc., Unequal Flange Rack Installation Instructions (February 2001), at pages 31-34. 
         [0005]    While the equipment just described functions adequately, improvements in optical system cable handling are continually sought. For example, the patent application referenced above describes a cabinet with a plurality of cable retainer boxes (CRBs) mounted adjacent to either side of a given piece of equipment, enabling protection of cables contained inside the cable management cabinet and facilitating effective organization of cables. The CRBs are spaced vertically along either one or both sides of equipment. The CRBs each have an open end that faces into the cabinet for ingress/egress of cables from optical devices contained with the cabinet. 
         [0006]    This cable management equipment has proven effective for use in central office switching facilities. However, recent improvements have advanced cable management practices even further. 
       STATEMENT OF THE INVENTION 
       [0007]    Many optical system installations incorporate and interconnect both data copper cables and optical fiber cables. In most aspects of these, including installation, repair and replacement, the data copper cables are separate and distinct from the optical fiber cables. The cable management cabinet described above is improved by separately managing the routing of data copper cables and optical fiber cables within the cabinet. This is accomplished by providing separate CRBs for data copper cables and optical fiber cables respectively. The CRBs are provided with front openings to facilitate installation and routing of optical fiber cable and data copper cables. The openings may be provided with edge guards to ease ingress/egress of cables through the openings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         [0008]    The invention will be more easily understood with the aid of the drawing, in which: 
           [0009]      FIG. 1  is a front view of a cable management cabinet showing the cable retainer boxes attached to the inside of the cabinet; 
           [0010]      FIG. 2  is a side view of  FIG. 1  taken from inside the cable management cabinet; 
           [0011]      FIG. 3  is a top view of  FIG. 1 ; 
           [0012]      FIG. 4  is a detailed view of an optical fiber CRB and a data copper cable CRB; and 
           [0013]      FIG. 5  is a detailed view showing both optical fiber cable CRBs and data copper cable CRBs mounted within a cable management cabinet. 
       
    
    
     DETAILED DESCRIPTION 
       [0014]      FIGS. 1-3  are schematic representations of a cable management cabinet according to the invention.  FIG. 1  shows the cabinet in plan view,  FIG. 2  shows the left side of the interior of the cabinet and  FIG. 3  is a top view. Within the cabinet are CRBs  101  and  102 . The optical fiber CRBs  101  are intended for optical fiber cables and the data copper cable CRBs  102  are designed for data copper cables. The CRBs are mounted to the cabinet housing as shown in more detail below. The number and placement of the CRBs along the sides of the cabinet is such that the cables may be routed efficiently to allow interconnection to optical system components housed within the cabinet. A typical installation will have at least a plurality of each type of CRB. A plurality in the context of the invention is at least three. A typical component is represented  104  in  FIG. 3 . The front of the cabinet is typically open to allow easy access to the interior. Shelves (not shown) may be provided in the cabinet to support optical system components. The figures show CRBs mounted on both sides of the cable management cabinet. However, cabinets may be designed for optical systems with smaller numbers of cables, in which case CRBs mounted along one side only may be sufficient to accommodate all the cables in the cabinet. 
         [0015]    The CRBs are shown in more detail in  FIGS. 4 and 5 , where an L-shaped mounting bracket  3  supports both types of CRBs.  FIG. 4  shows an optical fiber CRB and a data copper cables CRB attached to mounting bracket  3 .  FIG. 5  shows a perspective view of four optical fiber CRBs and four data copper cables CRBs attached to the mounting bracket, similar to the arrangement shown schematically in  FIGS. 1-3 . The mounting bracket  3  is attached to an interior side the cabinet, and extends continuously along the length (height) of the cabinet. As suggested above, the bracket and the CRBs may extend along one side or both sides of the cabinet. 
         [0016]    In  FIGS. 4 and 5  the data copper cable CRB is shown at  1 , and the optical fiber cable CRB is shown at  2 . In this particular embodiment the outside of the long arm of the L-shaped mounting bracket is attached to the cabinet  100 . The optical fiber cable CRB is attached to the inside of the long arm of the L-shaped mounting bracket, as shown, with fasteners  12 . The data copper cable CRB is attached to the short arm of the L-shaped mounting bracket with fasteners  13 . Both of the CRBs are provided with slots on one side of the CRB to accommodate installation and/or removal of the respective cables. Typically, data copper cables are larger than the optical fiber cables so the slots in the data copper cables CRBs may be larger than the slots in the optical fiber cable CRBs. 
         [0017]    In the arrangement shown the mounting bracket is L-shaped and the CRBs are mounted to the arms of the mounting bracket. However, a variety of options may be used to achieve the same or similar benefits. For example, the positions of the data copper cable CRB and the optical fiber cable CRB may be switched. The mounting bracket may be T-shaped. As should be evident, a T shape incorporates an L shape. The CRBs may be attached directly to the cabinet. 
         [0018]    According to another alternative embodiment, data copper cable CRBs may be mounted on one side of the cabinet and optical fiber cable CRBs may be mounted on the other side of the cabinet. 
         [0019]    In  FIGS. 4 and 5  the slots in the data copper cable CRBs are located in the side of the CRB facing toward the interior of the cabinet. Recognizing that the data copper cable CRBs and the optical fiber cable CRBs are not required to be positioned together at the same height in the cabinet, and in the case where the data copper cable CRBs are attached directly to the cabinet, the side of the data copper cable CRB that faces the back of the cabinet, or the side of the data copper cable CRB that faces the front of the cabinet, are accessible positions for placement of the slots. Either position may be used. Arrangements where slots are available on more than one side can be envisioned, but the construction of the CRB is simplified if only one side is provided with a slot, and the slot is formed by overlapping portions of the sidewall of the CRB. 
         [0020]    Options similar to those just described are also available for placement of the slots in the optical fiber cable CRB. 
         [0021]    As shown in  FIGS. 4 and 5 , the front of the optical fiber cable CRBs is provided with a bar that extends across the front of the box structure. This construction is preferred since it allows optical fiber cable CRBs to be placed closer together in the vertical dimension than if the front of the CRB had the approximate dimensions of the sides of the CRB. It also provides a U-shaped channel for confining multiple optical fiber cables as they ingress/egress from the CRB. The structure of the front of the CRB in  FIGS. 4 and 5  is actually H-shaped. However, that shape is optional. The main desirable feature may be defined as a bar extending laterally across the front face of the CRB to form a U-shaped channel for ingress/egress of optical fiber cables from the CRB. 
         [0022]    For the purpose of describing the invention the distinction between data copper cables and optical fiber cables may be significant. Optical fiber cables carry light guiding optical glass fibers. Data copper cables typically comprise insulated copper wires. 
         [0023]    Intuitively it would be expected that the optical fiber cables, when bent around the edges of an optical fiber cable CRB, will experience a high degree of friction, and may resist pulling into the position desired for routing and interconnection. They may even chafe to the point of failure. According to a feature of the invention, the bar that extends across the front of the optical fiber cable CRB, and forms the U-shaped channel just described, is provided with two edge guard attachments for reducing the friction of the optical fiber cables as they ingress/egress from the optical fiber cable CRB. The first is a bend radius insert for maintaining a minimum bend radius of the optical fiber cables as it travels across the bar. The bend radius insert it attached to the bottom of the U-shaped channel. The second is a sidewall fillet insert for achieving the same objective along the sides of the U-shaped channel. It is convenient to form these as a unitary body, as shown as  4  in  FIGS. 4 and 5 . However, they may be provided as two or more elements. The bend radius insert is an element intended to be defined by those terms. Specifically, it may be defined as a curved edge cover having a curve with a radius at least equivalent to the radius of the optical fiber cables. When the term bend radius insert is used herein, as an element applied to the bottom edge of the U-shaped channel described above, it is meant to have this definition. This definition which, when considered with the totality of the description and figures herein, has clear and concise meaning. 
         [0024]    Likewise, the sidewall fillet insert is an element intended to be defined by those terms. Specifically, it may be defined as a curved edge cover having a curve with a radius at least equivalent to the radius of the optical fiber cables. When the term sidewall fillet insert is used herein, as applied to either or both sides of the U-shaped channel described above, it is meant to have this definition. Similarly with the definition of the bend radius insert, a sidewall fillet insert, is a term that when considered with the totality of the description and figures herein, has clear and concise meaning. 
         [0025]    In the embodiments described above the CRBs that accommodate data copper cables are smaller than the CRBs that route optical fiber cables. While that will usually be the case, the opposite construction may be used, or the CRBs may be the same size and shape. In most cases the CRBs are provided with openings in the top and bottom, an opening in the front sidewall, and a slot in one of the three remaining sidewalls. The CRBs may be referred to as having a height, a width and a depth, with the top and the bottom defining the height. 
         [0026]    The cable management cabinet may be referred to as a rectangular structure having a top, a bottom, a back, a front, and two sides, and having a height, width and depth, with the long dimension of the rectangular structure corresponding to the height. The cabinet typically has openings in the top and the front. It may have a cover for the front opening. The width and the depth of the cabinet may be the same or different. 
         [0027]    Likewise the CRBs may be described as having a top, a bottom, a front, a back, and two sides. The back of the CRBs are attached to one or both sides of the cabinet with the height of the CRBs aligned to the height of the cabinet. In that configuration the front of the CRB faces the interior of the cabinet. 
         [0028]    In concluding the detailed description, it should be noted that it will be obvious to those skilled in the art that many variations and modifications may be made to the preferred embodiment without substantial departure from the principles of the present invention. All such variations, modifications and equivalents are intended to be included herein as being within the scope of the present invention, as set forth in the following claims.