Patent Description:
The cellular site also performs various processing to, for example, determine the appropriate frequency band for a transmission, amplify a signal, transmit and receive signals, etc. In older networks, this type of processing was typically done at the base inside the shelter, but after the introduction of third-generation (<NUM>) and fourth-generation (<NUM>) networks, at least some such processing (e.g., signal amplification) has largely been moved from the base station unit in the shelter to a processing unit located near the top of the cellular tower, since a considerable amount of energy would otherwise be lost via the radio frequency (RF) cable connection between the base station unit and the antenna(s) at the top of the tower.

However, while performing the amplification process at the top of the tower near the antenna helps to minimize energy loss, additional power and fiber optic cabling is required to supply power and data from the shelter to the unit on the tower. Conventional processing units are thus susceptible to damage and disruption from overvoltage and surge current when a lightning strike hits the tower (or nearby). Additionally, towers may host a number of different radio/antenna combinations, thus providing an issue for routing multiple DC link cables to fit the radios, and protecting the connections from overvoltage.

In some cases, hybrid cables are used in cellular sites to combine both fiber and power conductors. Inside such hybrid cables, there are copper wires that feed several radios with power, along with fiber optic cabling to provide a data connection to the radios. Typically, the hybrid cable is terminated in an enclosure and individual surge protectors are provided for each of the DC circuits that feed the radio. The fibers from the fiber optic cabling are terminated inside the enclosure and fiber jumpers are used to connect them to the radios. Likewise, power jumpers are used to connect the power wiring to each radio to the enclosure. An example of a cable breakout assembly is described in <CIT>.

One significant issue arising in conventional cellular sites is that the space available for the fiber optic breakout assembly (and other components) is extremely limited on the cellular tower, and this space is often costly for cellular operators to rent from owners of the tower. Embodiments of the present disclosure address this issue (among others) by providing a hybrid distribution unit that can distribute both power and data connections from a power and fiber cables (or from a hybrid cable containing both power and fiber) within a compact enclosure that helps reduce the overall footprint of the hybrid distribution unit mounted on a cellular tower. Some embodiments may additionally include circuit protection features, such as fuses or circuit breakers.

<CIT> discloses a hybrid distribution unit.

The included drawings are for illustrative purposes and serve to provide examples of possible structures and operations for the disclosed inventive systems, apparatus, methods and computer-readable storage media. These drawings in no way limit any changes in form and detail that may be made by one skilled in the art without departing from the scope of the disclosed implementations.

<FIG> illustrates one example of a power and communication system <NUM> that provides suppression for a distributed wireless communication station. A building <NUM> contains computing equipment for a base transceiver communication station (BTS) <NUM>, which may also be referred to herein as a "baseband unit. " Communication station <NUM> is connected through fiber optic cables <NUM> to different radios <NUM> (also referred to herein as "remote radio units") located on the top of a tower <NUM>. A Direct Current (DC) power plant <NUM> is connected through a DC power bus <NUM> and DC power cables <NUM> to the different radios <NUM> on tower <NUM>. The power plant <NUM> may also be referred to herein as a "power supply unit. " In one example, DC power cables <NUM> include sets of -<NUM> DC volt power cables <NUM>, return power cables <NUM>, and associated ground cables. In one example, power cables <NUM> and fiber optic cables <NUM> are run through a same hybrid trunk cable <NUM> that is routed out of building <NUM> and up tower <NUM> to a hybrid antenna distribution unit <NUM>.

A local base suppression unit <NUM> may be located inside of building <NUM> and connected to the local ends of power cables <NUM> relatively close to DC power plant <NUM> and communication station <NUM>. In one embodiment, base suppression unit <NUM> is located in a rack <NUM> that also contains DC power plant <NUM>. In another example, base suppression unit <NUM> is located in another rack or some other location next to power plant <NUM>. Examples of base suppression units are described in <CIT> which is incorporated by reference in its entirety.

Hybrid antenna distribution unit (also referred to herein as a "hybrid distribution unit") <NUM> is attached to a support <NUM> on top of tower <NUM> and is connected to the remote ends of power cables <NUM> and fiber optic cables <NUM> proximate to radios <NUM> and antennas <NUM>. In one example, distribution unit <NUM> is located within <NUM> meters of radios <NUM>.

The hybrid distribution unit may also be referred to herein as a hybrid fiber to the antenna (FTTA) / power to the antenna (PTTA) distribution unit. As illustrated in <FIG>, the hybrid distribution unit <NUM> may be installed on a mobile communications tower or mast (such as tower <NUM>) to provide for the connection and distribution of the hybrid trunk cable <NUM> to the jumpers <NUM> coupled to the remote radio units <NUM>. As described in more detail, below, the hybrid distribution unit <NUM> also provides integrated over voltage protection (OVP) modules to help protect the remote radio units <NUM> (also referred to herein as "RRUs").

Among other things, hybrid FTTA/PTTA distribution units of the present disclosure help provides higher installation capacity compared to conventional distribution units, as the hybrid distribution units of the present disclosure can support a high number of RRUs in a small footprint. Furthermore, the hybrid distribution units of the present disclosure help simplify deployment and accelerate installations as they can be provided pre-terminated (e.g., no cable connections required in the field).

<FIG> illustrates an interior view of a hybrid antenna distribution unit <NUM> in accordance with some embodiments. In this example, hybrid distribution unit <NUM> includes an enclosure <NUM> having an interior portion as shown. A cable entry and clamping mechanism <NUM> is disposed at the bottom of the enclosure <NUM> and is configured to receive a hybrid trunk cable <NUM> that includes one or more sets of power cables and one or more fiber optic cables. In alternate embodiments, the cable entry and clamping mechanism may be configured to receive separate power and data cables, such as a first trunk cable that includes one or more sets of power cables and a second trunk cable that includes one or more fiber optic cables.

Among other things, the enclosure <NUM> allows both the factory and field installation of the trunk cable(s) to the hybrid distribution unit <NUM>. For example, in some cases the hybrid distribution unit may be pre-wired and terminated during factory assembly such that an installer is not required to make any cable connections in the field. Additionally or alternatively, a user may remove the external dust cover of the hybrid distribution unit <NUM> (described in more detail below) to access the internal portion of the enclosure to add or modify wiring connections.

The enclosure may be sized and dimensioned to effectively route power and data cabling while only requiring a minimal footprint on the cellular tower. As shown in <FIG>, for example, the enclosure is tapered at the bottom such that the width of the top of the enclosure is wider than the width of the bottom. This helps to conserve space while still providing an efficient and effective routing of the cabling that can easily be accessed by installers or maintenance personnel.

The enclosure <NUM> may house one or more overvoltage protection (OVP) modules. In the example shown in <FIG>, OVP modules 215a, 215b, and 215c are disposed at the bottom of the interior portion of the enclosure, with OVP module 215a coupled to a first elongated bus bar 220a extending along a portion of the length of enclosure <NUM> (along the left side of the enclosure) and a second elongated bus bar 220b extending along a portion of the length of enclosure <NUM> parallel to the first bus bar 220a. In this example, the first bus bar 220a is an input power bus bar (-48V in this example) and the second bus bar 220b is a return power bus bar. In <FIG>, a ground plate <NUM> is disposed in the bottom of the enclosure <NUM> and is configured to extend and connect (e.g., through ground wiring) to the OVP modules 215a, 215b, and 215c.

<FIG> provides a more detailed view of the power connections within the enclosure <NUM>. In this example, there are three pairs of elongated bus bars (a -48V bar and corresponding return "RTN" bar) running lengthwise within the enclosure, though in alternate embodiments there may be more or fewer sets of bus bars.

As illustrated in <FIG>, The power conductors of the hybrid (or power) trunk cable are connected to the terminals of the OVP modules (Strikesorb <NUM>,<NUM>,<NUM>) at the bottom of the housing. To optimize the cable routing and minimize the assembly and installation time, two bars (-48V and RTN) equipped with lugs are connected to each OVP module and run lengthwise along the housing.

As shown in <FIG>, short factory terminated power cables are used for the connection of the bars' lugs to the proper terminals of the hybrid (or power) adaptors. For example, short power cable <NUM> connects the input power connection from adaptor <NUM> to the lug <NUM> on the first bus bar 220a.

The fiber optic portion of the hybrid cable (or the fiber optic cable in case of separate power and fiber optic trunk cables) is routed above the OVP modules through the interior portion of the enclosure <NUM>. <FIG> illustrates the enclosure <NUM> with the addition of fiber optic cable support elements <NUM> coupled to opposite sides of the enclosure. The fiber optic cable support elements <NUM> are configured to retain one or more fiber optic cables using one or more fasteners. In this example, three fiber optic cable support elements <NUM> are depicted running across the width of the enclosure, but in alternate embodiments more or fewer support elements may be used, and the elements may run in any suitable configuration (e.g., lengthwise) in the enclosure.

The fiber optic cable support elements <NUM> allow portions of the fiber optic cables <NUM> can be fastened to the support elements <NUM> using, for example, hook- and-loop fasteners coupled to the support elements <NUM>. Additionally, the support elements <NUM> may be disposed between the fiber optic cabling <NUM> and the removably attachable dust cover (discussed below) to help protect the fiber optic cable against crimping or other damage during the assembly of the housing. <FIG>, <FIG>, and <FIG> are exploded views of the hybrid antenna distribution unit shown in <FIG>.

<FIG> and <FIG> illustrate an example of the exterior portion <NUM> of hybrid distribution unit <NUM>. In this example, portion <NUM> may be coupled (e.g., using screws or nuts and bolts around the perimeter of portion <NUM>) to a dust cover <NUM> that encloses and protects the interior portion of the enclosure <NUM>. The dust cover <NUM> may also include (or be coupled to) support brackets <NUM> that allows the hybrid distribution unit <NUM> to be mounted on the cellular tower <NUM>. <FIG> illustrates a cut-away view of the exterior portion of the hybrid distribution unit shown in <FIG> and <FIG>.

As shown in <FIG>, the exterior portion <NUM> includes a plurality of angled tiered platforms <NUM>, with each platform configured to retain a row of adapters <NUM>. In this example, four angled platforms are shown, each with three adaptors per platform, but alternate embodiments may include more or fewer platforms, and more or fewer adaptors per platform. In this example, the plurality of angled tiered platforms <NUM> are angled toward the bottom of the enclosure. Among other things, this assists an installer (usually standing below the hybrid distribution unit <NUM> on a ladder or other support) to connect or disconnect cabling to the adaptors <NUM>.

<FIG> illustrates a detailed view of the terminals of a hybrid adaptor <NUM> that may be used in conjunction with embodiments of the present disclosure. In alternate embodiments, hybrid distribution units of the present disclosure may operate in conjunction with adaptors of any suitable size, shape, and configuration. In the example depicted in <FIG>, adaptor <NUM> includes a pair of power terminals <NUM>, corresponding to an input power terminal and return power terminal as discussed above. The adaptor <NUM> further includes fiber optic connectors <NUM>. The power terminals <NUM> and fiber optic terminals <NUM> connect to the power cables and fiber optic cables, respectively, as shown in the interior view of the hybrid distribution unit <NUM> in <FIG>. For example, power jumper cables (e.g., power jumper cable <NUM>) and fiber optic jumper cables (e.g., fiber optic jumper cable <NUM>) plug into the ends of power terminals <NUM> and fiber optic terminals <NUM>, respectively. <FIG> illustrates an example of a hybrid cable that may be used to connect to the adaptors <NUM>. In this example, the hybrid RRU jumper cable includes supply power (-<NUM>) and return (RTN) power lines, along with fiber optic connectors <NUM>. There are two pairs of fiber optic connectors in this example, one pair for the top set of connectors <NUM> and one for the pair for the bottom set of connectors <NUM> shown in <FIG>.

<FIG> illustrates an example of a process for manufacturing a hybrid distribution unit according to various embodiments. The hybrid distribution units of the present disclosure provide a number of advantages over conventional systems. For example, embodiments of the disclosure help provide both overvoltage protection and fiber/power cabling distribution in a small footprint housing. The mechanical design and the use of bars in the interior of the housing allow the reduction of the required volume for the connection of the cables. The hybrid distribution units of the present disclosure provide space for the safe routing of the fiber optic cables, taking into consideration the minimum bend radius requirements, while also protecting the fiber cabling from damage and doing so with a minimal footprint. Additionally, the hybrid distribution units of this disclosure can either factory terminated or installed in the field, and can be configured to be compatible with a variety of hybrid trunk cabling or stand-alone power/fiber cabling.

As introduced above, hybrid distribution units of the present disclosure may include one or more overvoltage protection (OVP) modules (e.g., OVP modules 215a, 215b, and 215c in <FIG>) to help protect the remote radio units <NUM>. Another example of a hybrid distribution unit utilizing OVP modules is illustrated in <FIG>.

Additionally, some embodiments of hybrid distribution units of the present disclosure may include fuses or circuit breakers to likewise help protect the components of the hybrid distribution units as illustrated in <FIG>, <FIG>, and <FIG>.

For example, <FIG> illustrates an example of a hybrid distribution unit <NUM> that utilizes fuses to protect the components of the unit <NUM>. In this example, the hybrid distribution unit <NUM> includes an enclosure <NUM> having an interior with a first elongated bus bar <NUM> extending along a portion of the length of the enclosure <NUM> and a second elongated bus bar <NUM> extending along a portion of the length of enclosure <NUM> parallel to the first bus bar <NUM>. As in the example shown in <FIG> and described above, the first bus bar <NUM> is an input power bus bar (-48V in this example) and the second bus bar <NUM> is a return (RTN) power bus bar.

<FIG> also illustrates a plurality of adapters <NUM>, with respective cables <NUM> for coupling the adapters <NUM> to the second/return bus bar <NUM>, as well as cables <NUM> for coupling the adapters <NUM> to the first/input bus bar <NUM>. Incoming hybrid cable -48V conductors <NUM> and RTN conductors <NUM> enter the interior of the enclosure <NUM> through hybrid cable gland <NUM>. The -48V conductors are coupled to the -48V terminals <NUM>, while the RTN conductors <NUM> are coupled to the RTN terminals <NUM>.

In <FIG>, the first/-48V bus bars <NUM> include respective fuses <NUM> coupled to the adapters <NUM>. In this examples, the respective fuses <NUM> are held in receptacles formed in the first/48V bus bars <NUM> to allow the fuses to be removed and inserted into the receptacles. <FIG> illustrates a schematic diagram showing the electrical coupling of the fuses <NUM> between the adapters <NUM> and the -48V bus bars <NUM>. Additionally, a grounding plate <NUM> is disposed in the bottom of the enclosure <NUM> and is configured to connect to the OVP modules (labeled "Strikesorb modules" in this example) <NUM>.

<FIG> illustrate front and side views, respectively, of the exterior portion <NUM> of hybrid distribution unit <NUM> shown in <FIG>. In this example, similar to the examples shown in <FIG>, the exterior portion <NUM> of the enclosure includes a plurality of angled tiered platforms configured to retain a respective row of hybrid adapters <NUM>. Similar to the dust cover <NUM> shown in <FIG>, a dust cover (not shown) may be removably attached to the hybrid distribution unit <NUM> to enclose the interior portion <NUM> of the enclosure.

The exterior portion <NUM> of the enclosure shown in <FIG> includes a plurality of protective fuse caps <NUM>, that are removably attached to the exterior portion of the enclosure <NUM> and covering a respective fuse <NUM> from the plurality of fuses. In some embodiments, the protective fuse caps <NUM> may be formed from a material (e.g., plastic) that is at least partially transparent to allow visual inspection of the fuses <NUM>. In this manner, a user may open/remove the protective fuse cap <NUM> for a particular fuse <NUM> to remove and replace the fuse <NUM>.

<FIG> illustrate an alternative embodiment of a hybrid distribution unit <NUM> that utilizes circuit breakers to protect the components of the unit <NUM>. In this example, as shown in <FIG>, hybrid distribution unit <NUM> includes an enclosure <NUM> having an interior with incoming hybrid input (-48V) conductors <NUM> and incoming hybrid cable return (RTN) conductors <NUM> received through hybrid cable gland <NUM>. The input/-48V conductors are coupled to -48V terminals <NUM> on printed circuit board (PCB) <NUM>, which includes circuit breakers mounted thereon.

An elongated bus bar <NUM> extending along a portion of the length of the enclosure <NUM> is a return (RTN) power bus bar. Adapters <NUM> are coupled to the RTN bus bar <NUM> via cables <NUM> and to the PCB <NUM> via cables <NUM>, which connect to circuit breaker terminals <NUM> on the PCB <NUM>, thus putting the circuit breakers between the -48V input conductors <NUM> and adapters <NUM>. <FIG> illustrates a circuit diagram showing the adapters coupled to the RTN bus bar <NUM> via cables <NUM> and to the circuit breakers <NUM> on PCB <NUM> via cables <NUM>. As further illustrated in <FIG> and <FIG>, grounding plate <NUM> disposed within the interior of the enclosure <NUM> is coupled to the OVP ("Strikesorb") modules <NUM>, -48V terminals <NUM>, and RTN terminals <NUM>.

While the examples shown in <FIG> and <FIG> illustrate a <NUM>:<NUM> relationship between adapters <NUM> and circuit breakers <NUM>, in alternate embodiments a single circuit breaker <NUM> may be coupled to more than one adapter. For example, a circuit breaker <NUM> may be coupled between the input/- <NUM> power conductors <NUM> and at least two adapters <NUM>.

<FIG> illustrate front and side views, respectively, of the exterior portion <NUM> of hybrid distribution unit <NUM> shown in <FIG>. In this example, similar to previous hybrid distribution unit examples described above, the exterior portion <NUM> of the enclosure includes a plurality of angled tiered platforms configured to retain a respective row of hybrid adapters. Similar to the dust cover <NUM> shown in <FIG>, a dust cover (not shown) may be removably attached to the hybrid distribution unit <NUM> to enclose the interior portion <NUM> of the enclosure.

The exterior portion <NUM> of the enclosure shown in <FIG> illustrates respective switches for the plurality of circuit breakers <NUM> extending through the exterior portion <NUM> of the enclosure, with each switch having a closed state or an open (tripped) state. A circuit breaker covering <NUM> is removably attached to the exterior portion of the enclosure <NUM> and covers the switches of the circuit breakers <NUM>. In some embodiments, the circuit breaker covering <NUM> may be formed from a material (e.g., plastic) that is at least partially transparent to allow visual inspection of the switches of the circuit breakers <NUM>. In this manner, a user may open/remove the circuit breaker covering <NUM> to identify one or more tripped circuit breakers <NUM> and reset the circuit breakers <NUM> to their closed state as appropriate.

<FIG> illustrate an example of a hybrid jumper cable <NUM> that may be used to attach to the adapters in any of the hybrid distribution units described herein. In this example, hybrid jumper cable <NUM> may be coupled to an adapter from the plurality of adapters of a hybrid distribution unit. As shown in <FIG>, hybrid cable <NUM> includes a supply power line <NUM>, a return power line <NUM>, and one or more fiber optic connectors (not shown).

The hybrid jumper cable <NUM> further includes one or more fuses <NUM> coupled to the supply power line <NUM> or the return power line <NUM> to help protect a hybrid distribution unit and its associated components. For example, <FIG> illustrates a schematic diagram showing an example where fuse <NUM> is coupled to a -<NUM> supply power line <NUM>, between a hybrid adapter for a radio unit <NUM> at a first (top) end of the cable <NUM>, and a hybrid adapter for an incoming cable <NUM> at a second (bottom) end of the cable <NUM>.

<FIG> illustrates a close-up cutaway view of the hybrid jumper cable <NUM>, which includes a ground pin <NUM>, an incoming hybrid cable return (RTN) conductor <NUM>, and an incoming hybrid cable supply/-48V conductor <NUM>. Conductors <NUM> and <NUM> are coupled to RTN cable <NUM> and -48V cable <NUM>, respectively. In this example, the fuse <NUM> is removably attached to a fuse receptacle within the interior portion of the hybrid jumper cable <NUM>, and the receptacle is coupled to the -48V supply line, as illustrated in the schematic in <FIG>.

In some embodiments, the hybrid jumper cable <NUM> may include a cover (not shown) that is removable to access the fuse receptacle to remove/replace the fuse. In some embodiments, the cover may be at least partially transparent to allow visual inspection of the fuse by a user without having to open up the interior portion of the cable <NUM>.

<FIG> illustrate an example of another embodiment of a hybrid distribution unit <NUM>. In this example, hybrid distribution unit <NUM> includes a first (-48V input) busbar <NUM> extending along at least a portion of the length of the interior portion of the enclosure <NUM> and configured to connect to a first set of one or more power cables (incoming hybrid -48V cable conductors <NUM>) entering the interior portion <NUM>. The enclosure <NUM> further includes a second (return, or RTN) elongated bus bar <NUM> extending along at least a portion of the length of the interior of the enclosure <NUM> and configured to connect to a second set of one or more power cables (incoming hybrid cable RTN conductors <NUM>) entering the interior portion <NUM>.

In this example, -48V conductors <NUM> connect to the -48V bus bar <NUM> via the -48V terminals <NUM>, while the RTN conductors <NUM> connect to the RTN bus bar <NUM> via RTN terminals <NUM>.

Similar to the other hybrid units disclosed above, a plurality of adapters <NUM> extend from the exterior portion of the enclosure. In this example, the adapters <NUM> include a first set of one or more connectors (e.g., cables <NUM> and <NUM> in this example) configured to connect one or more power jumper cables to the first and second elongated bus bars <NUM>, <NUM>. The adapters <NUM> further include a second set of one or more connectors (not shown) configured to connect one or more fiber optic jumper cables to the ends of one or more fiber optic cables entering the interior portion of the enclosure (not shown).

In the example illustrated in <FIG>, a first printed circuit board (PCB) <NUM> is coupled to the first bus bar <NUM> and includes a first plurality (two in this example) of overvoltage protection (OVP) modules <NUM> (labeled "Strikesorb"). At least one OVP module <NUM> from the first plurality of OVP modules is coupled to an adapter <NUM> from the plurality of adapters.

Similarly, a second PCB <NUM> is coupled to the second bus bar <NUM> and includes a second plurality of OVP modules <NUM>, where at least one OVP module from the second plurality of OVP modules is coupled to an adapter from the plurality of adapters.

As with the other hybrid distribution units described herein, alternate embodiments of the present disclosure may include any suitable number of input and return bus bars, adapters, and associated components. In the present example, the distribution unit <NUM> includes two input bus bars <NUM> and two return bus bars <NUM> with associated PCB cards <NUM>. Similar to the other hybrid distribution units described above, the exterior portion of the enclosure <NUM> may include a plurality of angled tiered platforms (not shown), wherein at least one of the plurality of angled tiered platforms is configured to retain a row of the adapters <NUM>. Likewise, the hybrid distribution unit <NUM> may additionally include a dust cover that is removably attachable to the hybrid distribution unit apparatus <NUM> to enclose the interior portion of the enclosure <NUM>.

<FIG> illustrates an example of a schematic showing the coupling of the OVP modules <NUM> to each adapter <NUM>. As shown, each adapter <NUM> is coupled to a first OVP module <NUM> on its associated input (-48V) busbar <NUM> and to a second OVP module <NUM> on its associated return (RTN) busbar <NUM>. The OVP modules <NUM> coupled to each adapter <NUM> are further coupled to grounding plate <NUM> disposed at the bottom of the enclosure <NUM>.

In some embodiments, one one or more of the OVP modules <NUM> may be removably attached (e.g., using sockets) to the first bus bar <NUM> or second bus bar <NUM> to allow replacement of the modules <NUM>. Additionally or alternatively, the PCB cards <NUM> themselves may be removably attached to their respective bus bars <NUM>, <NUM> to allow replacement of modules <NUM>.

The figures listed above illustrate examples of embodiments of the application and the operation of such examples. In the figures, the size of the boxes is not intended to represent the size of the various physical components. Where the same element appears in multiple figures, the same reference numeral is used to denote the element in all of the figures where it appears.

While some implementations have been described herein, it should be understood that they have been presented by way of example only, and not limitation. Thus, the breadth and scope of the present application should not be limited by any of the implementations described herein, but should be defined only in accordance with the following and later-submitted claims and their equivalents.

Claim 1:
A hybrid distribution unit apparatus (<NUM>) comprising:
an enclosure (<NUM>) having an interior portion, exterior portion (<NUM>), a bottom, and a length;
a first elongated bus bar (<NUM>) extending along at least a portion of the length of the interior portion of the enclosure (<NUM>) and configured to connect to a first set of one or more power cables (<NUM>) entering the interior portion from the bottom of the enclosure (<NUM>);
a second elongated bus bar (<NUM>) extending along at least a portion of the length of the interior of the enclosure (<NUM>) and configured to connect to a second set of one or more power cables (<NUM>) entering the interior portion from the bottom of the enclosure (<NUM>); and
a plurality of adapters (<NUM>) extending from the exterior portion (<NUM>) of the enclosure (<NUM>), wherein at least one adapter (<NUM>) of the plurality of adapters (<NUM>) includes a first set of one or more connectors (<NUM>) configured to connect one or more power jumper cables to the first and second elongated bus bars (<NUM>, <NUM>) and a second set of one or more connectors configured to connect one or more fiber optic jumper cables to ends of one or more fiber optic cables entering the interior portion of the enclosure (<NUM>) from the bottom of the enclosure (<NUM>),
wherein the apparatus is characterised in that the apparatus further comprises: a plurality of fuses (<NUM>), wherein at least one fuse (<NUM>) from the plurality of fuses (<NUM>) is coupled between a respective adapter (<NUM>) from the plurality of adapters (<NUM>) and the first bus bar (<NUM>).