referring now to fig2 , there is shown one example of a frame 10 which may part of an assembly according to one embodiment of the invention . as shown , the frame 10 includes one or more cavities or receptacles ( collectively referred to as “ cavities ” or “ cavity ”) 20 a - 20 d and 30 a - 30 e . at any given time some cavities , such as cavities 20 a - 20 d , may receive one or more components ( e . g ., power filters , electrical connectors and components , optical connectors and components , radio frequency identification ( rfid ) microchips and registered - jack ( rj ) type telecommunication jacks ) which are intended to be , or are , connectibly inserted into , attached to , or otherwise placed into , a cavity . the inclusion of an rfid chip in a machined cavity on , for example , the outside of the assembly may allow for the identification , tracking , etc ., of one or more of the other components within an assembly . further , other cavities , such as cavities 30 a - 30 e , may be used as spare cavities ( i . e ., available to receive one or more components in the future ). it should be understood that any number of filters and other electronic , mechanical , optical , electrical components ( to name just a few examples ) may be connectibly inserted , attached to , or otherwise placed into a cavity 20 a through 30 e . further , it should be understood that the number of cavities shown in fig2 is for illustrative purposes only ; it being understood that their number may vary and still fall within the scope of the present invention . as used herein the word “ filter ” may mean a single filter , such as an rf power or signal ( analog or digital ) filter , or one made of several components assembled in one or more cavities separated by bulkhead ( s ) ( see fig8 a and 8b ), or a circuit board that includes filtering components , or a final assembly . in accordance with embodiments of the invention , a filter may be connected to either copper or optical fiber transmission lines . yet further , a filter may include optical fiber , optical components , optical - to - electrical components , and / or electrical - to - optical components . in accordance with embodiments of the invention , the shapes and sizes of the cavities 20 a - 20 d and 30 a - 30 e may be varied in order to properly receive a particular component . also shown is cavity 40 that is used to receive one or more communications type conduit , wiring , or cabling such as optical cables . fig3 depicts an alternative frame 100 that includes bulkheads or internal partitions 400 a , 400 b , filled cavities 200 a - f and spare cavities 300 a - l according to another embodiment of the invention . as illustrated in fig2 and 3 , the cavities may be arranged in a compact manner in order to make efficient use of the available space on the frames 10 , 100 so that machining of each cavity may be optimized around any component received by the cavities 200 a through 300 l . as is known in the art , because of the difficulty in bending or otherwise shaping thin metal in 3 - dimensions with the precision required , most filters are formed using shapes that are the easiest to create , such as cylindrical or a “ shoe box ” designs ( so - called “ tin can ” designs ). realizing this , the present inventors provide for an optimized frame to receive filters and other components that may take the form of complex shapes that can be very accurately reproduced . cad - based designs and cnc machining allow for the design and creation of such complex , yet precisely cut , shapes . as mentioned above , the use of cad designs and cnc machining also helps achieve the efficient and optimum use of available space on a frame , such as frame 100 , so that the formation ( e . g ., machining ) of each cavity may be optimized around any component received by cavities 20 a - 20 d , 30 a - 30 e and 200 a through 300 l . given the type of components desired to be placed into a frame , and the desired frame size , the present invention provides optimum formed cavities , frames and components . fig2 and 3 are simplified illustrations of how cavities may be sized , shaped , positioned in a frame and placed with respect to other cavities in order to optimize space for a given design . in accordance with embodiments of the invention , and as shown in fig1 - 10 , cavities may be formed using parallel walls and still form very complex shapes . referring now to fig4 , there is shown a cross - sectional view of an assembly 60 taken along axis a - a of fig2 . as shown in this view , the assembly 60 includes a power and signal cartridge 50 with a filled cavity 20 a and a spare cavity 30 c . in one embodiment of the invention the filled cavity 20 a may receive a power filter 70 . further , communication signals may be input into the filter 70 at one end 41 and output at another end 42 . as shown the assembly 60 is oriented such that end 41 receives signals from sources outside a shielded enclosure 80 or the like ( only a portion of the outer layer of enclosure 80 is shown ) while end 42 outputs signals into the enclosure . yet further , filter 70 may pass signals in both directions ( i . e ., into , and out of , the enclosure ). the type of enclosure 80 may vary widely from a lightweight fabric to a more rigid , or sheet - metal based tempest - like enclosure to give just a few examples . though referred to in the singular , it should be understood that the filter 70 may comprise one or more components ( as shown in fig4 ). in a further embodiment of the invention , when optical fiber is used to carry communication signals and the like into the enclosure 80 one or more additional components may be added to the cavity 20 a or 30 c or made a part of the filter 70 to allow for the transmission , filtering and / or conversion , if needed , of optical signals to electrical signals ( o / e ) and , if needed , conversion back from electrical signals to optical signals ( e / o ). in the case where no o / e or e / o conversions are necessary , the filter 70 and any additional component may be all optical components . yet further , analog / digital optical converters , as well as passive and active optical components may be added to the cavity 20 a or 30 c or made a part of the filter 70 as required . also shown are variable flanges 51 a and b for attaching the assembly to the enclosure 80 . as shown in this embodiment , the assembly 60 protrudes outward from the enclosure 80 . the assembly 60 in fig4 also depicts other features ( e . g ., potting wax or foam ) which are evident from the figure itself and , thus , need not be discussed in detail or repeated here . in addition , rather than depict all of the various connections required to make the filter 70 shown in fig4 operable such connections have been omitted for the sake of clarity , such connections being known to those skilled in the art . similarly , in the assemblies shown in fig5 - 7 the internal and external connections , all known to those skilled in the art , have been omitted for the sake of clarity . fig5 depicts an alternative embodiment of an assembly 61 that is connected to an enclosure 81 in such a way ( e . g ., via flanges 52 a , 52 b ) that the assembly protrudes into the enclosure 81 . fig6 depicts an alternative embodiment of an assembly 62 that is connected to an enclosure 82 by flanges 53 a and b in such a way that the assembly 62 can be centered with respect to a perimeter of the enclosure 82 in order to minimize the dimensions of the assembly 62 . as illustrated in fig4 - 7 the position of the flanges may be varied in order to provide different structural features and / or functions . fig7 depicts an alternative embodiment of an assembly 63 , where the thickness of the frame 1000 may be varied in order provide a more compact , optimum and tight fit for components 700 received within cavity 20 a . said another way , the frame &# 39 ; s 1000 thickness may be varied in accordance with the dimensions and other characteristics of the components 700 that are received by the cavity 20 a . fig8 a and 8b depict vertical and horizontal bulkheads 90 - 99 . in one embodiment of the invention horizontal bulkheads may help provide physical , electrical and rf isolation of the filters and / or components placed within cavities . such bulkheads may be connected to an assembly by any number of means , including soldering . in yet another embodiment of the invention , vertical bulkheads may also be included in an assembly to provide isolation as well . for ease of machining and assembly , it may be desirable to install components on a bulkhead prior to installing the bulkhead in an assembly . fig9 a and 9b depict two additional , alternative assemblies 64 a and b . as shown , the cavities 2000 a , b and components 7000 a , b included within assembly 64 a form a single layer . in comparison , the cavities 2001 a , b and 2002 a , b and components 7001 a , b and 7002 a , b included within assembly 64 b form two ( or more layers ). fig1 depicts a number of geometric shapes ( e . g ., square , circular , rectangular , rounded ) that an assembly may take the form of , it being understood that the shapes shown are just some of the many shapes that an assembly may take the form of . fig1 depicts the formation of one or more heat sinks 66 on a lid 67 of an assembly 65 according to one embodiment of the invention . such heat sinks help dissipate heat from the assembly and its components . fig1 depicts an exemplary manufacturing process which may be followed to make assemblies in accordance with aspects of the present invention . backtracking somewhat , it should be understood that machined , metal or metal alloy ( e . g ., aluminum ) billets may be used as frames / assemblies in order to provide strength . further , machined parts may receive a special surface treatment to allow increased conductivity , allow for soldering and reduce the risk of corrosion . alternatively , as generally illustrated by some of the designs shown in fig1 the frame may be made from a metal casting to realize efficient use of raw material and lower costs if large , production quantities are required . the description above provides some examples of the scope of the present invention . it is not intended to be an exhaustive description of the many examples of the invention . such a description would be impractical to write .