Patent Publication Number: US-8112669-B2

Title: Wireless diagnostic system

Description:
FIELD OF THE INVENTION 
     The present invention generally relates to test equipment interconnectivity for testing the operating condition of a geographically distributed system such as a Broadband Communications System and, more particularly, for providing transmitted results of testing to an operator of the test equipment as well as logging and/or analyzing test results at another portion of the system and/or independently of the system such as a central facility or a combination thereof. 
     BACKGROUND OF THE INVENTION 
     In recent years, many systems have been developed for various purposes, wherein the systems are distributed over a potentially large area. The distribution of portions of the systems thus requires that testing of the operational conditions of the system be performed locally to respective portions of the system and requires test equipment and trained operators thereof who are also trained to effect most, if not all, types of installation, repair or maintenance to perform testing at the respective portions of the system using portable equipment. So-called Broadband Communications Systems such as are currently used for distribution of entertainment programming, Internet access, telephone service and the like are exemplary of systems where testing must be performed at particular locations of portions of the system not only to assure adequate performance of the system but to prevent egress of broadband signals that may interfere with other communications transmissions. Further, signal quality and substantial freedom from signal ingress and egress is of paramount importance, particularly where additional services such as high-speed digital computer network connections and digital telephone connections (e.g. using voice over internet protocol) are provided over the Broadband Communications System infrastructure. Many testing devices for such systems have been developed and are known at the present time. 
     Such testing devices require that testing operations be controllable by the operator of the test equipment and the results of testing be communicated to the operator of the testing device so that any problems or out-of-tolerance conditions can be diagnosed, the cause(s) located and remedial action taken. Thus, a keyboard and display or other structures capable of such data, entry and communication functions are generally provided as part of the test instrument. Such input and output devices often represent a significant fraction of the cost of the test instrument. Since tests to be performed are often numerous and complex, it is also generally desirable for testing protocols to be at least partially automated (e.g. to at least provide prompts to a user of a preferred sequence of tests of different parameters within an overall testing protocol and to automate various steps within each testing operation) so that a potentially complex test can be performed upon entry of a simple command by the user. Testing devices or instruments are also required to be sufficiently rugged to withstand field use which also contributes significantly to their cost while input and output arrangements are significant sources of potential damage that can possibly disable the test instrument and require expensive repairs. 
     It is also generally desirable and often required that the test results be documented. For example, during installation of service and/or new equipment for communication to (and/or from) a particular location, in excess of twenty separate tests may be performed at a number of different locations within a given installation to qualify the installation as being completely and correctly installed (including accommodation of the environment of the installation such as noise sources) and capable of providing high-speed data connections when the installation is completed. Documentation of the measured signal parameters can thus prove that the installation is capable of delivering merchantable service as well as providing a baseline against which a need for repairs or upgrades may be determined. However, manual recording and transcription (usually as a paper copy at the present time) of numerous parameter values is necessarily time-consuming and subject to errors; causing delays and providing no assurance that adequate quality of service is provided by the installation or that repairs are adequately effective before installation or maintenance personnel leave the work site. Additionally, there is no provision for work orders to be received and cleared in a timely fashion. As a result, scheduling of repairs and installation is complicated and inefficient while numbers of “call-backs” to improve or correct installations and repairs appears to be much larger than might otherwise be achieved. 
     As a partial solution to this latter problem, technical maintenance personnel sometimes carry laptop or notebook computers with wireless network communication capability and/or wireless communication devices (e.g. so-called palm-top devices or communication device similar to those used for object tracking in courier delivery systems and the like) into the field for problem diagnosis, to suggest particular test protocol sequences and in order to make more timely reports of work done. However, doing so is cumbersome and inconvenient and involves redundant input and output structures between the testing device and the communication device which are often of substantial weight and bulk as well as requiring plural devices to be carried into the field and manipulated at the work site. In such arrangements, manual transcription of measured data which may be stored in the testing instrument remains subject to error or the portable computer device must be programmed to perform downloads of stored data from the test instrument which must remain capable of autonomous operation under direct control of the operator. 
     SUMMARY OF THE INVENTION 
     It is therefore an object of the present invention to provide a test instrument system which is compact, light weight, rugged, convenient to use and of reduced cost due to elimination of redundant components while being capable of potentially simultaneous communications with an operator (e.g. through a companion PC, PDA or the like and concurrent documentation of test results in a manner which is virtually free from human error or possible falsification. 
     It is another object of the invention to provide a method of testing portions of a distributed system and wirelessly communicating results of such testing in substantially real-time. 
     It is a further object of the invention to provide a substantially real-time communication system which will support analysis for detecting trends, evaluating personnel performance and/or making management decisions including workforce management and scheduling with increased efficiency and workforce effectiveness; which additional analysis facility can be included in the overall system in accordance with the invention for end-to-end monitoring and management and efficiency improvement of a Broadband Communication System. 
     In order to accomplish these and other objects of the invention, a test system for measuring operating parameters of a distributed system is provided comprising a testing device including a connector for connection to a test point, a memory for storing instructions for a plurality of test sequences, and a processor responsive to commands for executing the instructions to perform the test sequences and collecting data responsive to said test sequences, a controller physically separate from the testing device including a manual input arrangement, a display, and a processor responsive to the manual input arrangement for controlling storage and execution of the instructions for a plurality of test sequences in the testing device and receiving, storing and displaying data collected by said testing device, and a communication link between the testing device and the controller for communicating control signals and the instructions for a plurality of said test sequences from said controller to the testing device and communicating data collected by the testing device to the controller. 
     In accordance with another aspect of the invention, a method of testing portions of a distributed system is provided including establishing a communication link between a testing device and a controller physically separate from the testing device, storing instructions for a plurality of test sequences in the testing device under control of said controller, connecting the testing device to a test point of the distributed system, transmitting from the controller to the testing device a command to perform a test sequence, performing the test sequence and collecting test data at the testing device, transmitting the test data from the testing device to the controller; and displaying the test, data at the controller. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The foregoing and other objects, aspects and advantages will be better understood from the following detailed description of a preferred embodiment of the invention with reference to the drawings, in which: 
         FIG. 1  is a schematic diagram of a Broadband Communications System cable drop installation illustrating required test points thereof, 
         FIG. 2  is a simplified schematic diagram of the overall testing system in accordance with the invention, 
         FIG. 3  is a schematic diagram of preferred architecture and functional elements for practice of the invention, and 
         FIG. 4  is a flow chart and data flow diagram illustrating the methodology of the invention during use. 
     
    
    
     DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION 
     Referring now to the drawings, and more particularly to  FIG. 1 , there is schematically shown an exemplary cable drop installation to which the invention is applicable. Since  FIG. 1  is arranged, to facilitate an understanding of the application of the invention, no portion thereof is admitted to be prior art in regard to the present invention. Further, at the level of abstraction illustrated, the invention may or may not be included in the illustration of  FIG. 1  and  FIG. 1  has thus been designated “Related Art”. It is also to be understood that while the invention will be described in connection with a Broadband Communications System (sometimes, for convenience, referred to hereinafter as a cable system) in which the invention is particularly advantageous, the invention is also applicable to other types of distributed systems such as power, water and natural gas distribution systems and other utilities as well as dedicated communication or data processing systems or networks and the like. 
     In  FIG. 1 , an exemplary portion of a cable distribution system  10  is illustrated with a tap  11  attached thereto to deliver the signal carried by the cable distribution system to a residence, business facility or the like or upstream communications such as internet access and telephone service over drop cable  12 . In general, it is desirable and often required by local codes that the installation be grounded to prevent incursion of electrical discharges from the environment such as lightning and a grounding or bonding block  14  or the like is illustrated for performing such a function. An entry cable  15  then carries the signal through any structure (e.g. wall  16 ) which may be found at the installation site to a signal splitter and/or amplifier(s)  17  which provides the signal to different locations at the installation site as may be required or desired. Further signal splitters and/or amplifier(s)  18  may be provided as may be required for a particular installation. The plurality of branches thus provided are then terminated at so-called set-top-boxes (STBs) capable of receiving and decoding the distributed signal and/or interfacing an upstream signal to the cable system or, possibly, high-speed cable modems for bidirectional communications such as telephony. Junctions between some of these structures are useful as test points to isolate such structures to determine defects and to conduct other desired tests. 
     For example, test point A will provide an indication of signal quality in the cable distribution system  10  as delivered by tap  11 . Test point B allows determination of defects in the drop cable  12  as well as determining (with the drop cable  12  disconnected) any noise that is coupled to the installation from the environment of the installation site which could be propagated upstream and to cable distribution system  10 . Test point C allows testing efficacy of the grounding provided by grounding/bonding block  14 . Test points D-H allow testing for defects or degraded signal propagation over entry cable  15  and signal splitters/amplifiers  17  and  18  as well as the connecting cables which can usually be individually traced efficiently if a problem is encountered. 
     During installation and/or problem diagnosis a test instrument will generally be connected to each of these test points, in order, to trace signal propagation and maintenance of signal quality. Using prior known test instruments, the instrument would be connected to a test point with or without disconnection of downstream portions of the system, a test sequence initiated from the keyboard or other input arrangement of the test instrument, measurements made in accordance with programmed procedures stored in the test instrument (some procedures possibly being specific to a test point, or a combination thereof) and the results displayed to an operator of the test instrument who would then be capable of evaluating them, diagnosing any abnormality and taking any required remedial action. 
     In general, due to the complexity of test protocols and combinations of test sequences of each such protocol, test instruments currently in use or available are generally programmed to carry out relatively long sequences of test protocols autonomously upon initiation of testing by an operator. The test protocol(s) would then proceed until an abnormal or out-of-tolerance result was detected by analysis also programmed into the test instrument. At that point, the test protocol(s) would be interrupted and relevant test results displayed on the test instrument for review and further analysis by the operator. The test instrument can also, through such analysis capability, make suggestions in regard to repairs or other requirements of an installation. The operator can then take remedial action and, when completed, the test protocol(s) restarted or resumed from a point before that which produced the abnormal or out-of-tolerance result. 
     The test results (before and after any remedial action) may also be stored in the test instrument for later downloading. However, performing the downloading after return of the test instrument to a central facility or the like engenders delays that are generally undesirable to installation and/or maintenance personnel since they are generally compensated based upon the number of repair or installation calls performed (but not necessarily whether the installation and/or maintenance was performed completely, correctly or effectively). From the standpoint of the cable system administrator or operator (as distinct from the test instrument operator, installation and/or maintenance personnel), while the downloading of test data from the test instrument is desirable for archival storage and performance documentation purposes, delays incurred by downloading test data at the central facility or the like is also undesirable since it cannot be performed while the installation and/or maintenance personnel remain on site and thus has no potential for reducing frequency of “call-backs” to complete, correct or revise installation or maintenance work. 
     If a portable data processor with wireless communication capability or other wireless communication device is available to the operator of the test instrument, it could be used independently of the test instrument at this point to communicate test results to system storage and/or a central facility as alluded to above. Doing so manually by technical maintenance and installation personnel is becoming increasingly frequent to close work orders in a more timely fashion even though it is cumbersome, subject to errors or possible falsification (unless automated data downloading from the test instrument to the portable data processor is provided in the field; requiring each data processor to be separately and specially programmed for the purpose) and requires much redundant structure to be provided by the test instrument and the data processor; each of which must necessarily be capable of operating as a stand-alone device. However, the personal computer or communication device cannot perform testing and currently available testing instruments cannot perform communications of the test data gathered other than possibly by storing the data for later downloading. 
     In this regard, it should be understood that, as Broadband Communications Systems corresponding to a single provider become increasingly large or multiplied, management of the technical field staff becomes an ever-increasingly important and complex issue. Centrally controlled (e.g. centrally of a cable system or centrally for a plurality of service providers) workforce management systems could provide a dramatic improvement to the otherwise unwieldy task of ensuring that accurate and acceptable test results are obtained, while collapsing the customer-scheduled installation time window to a reasonable and generally acceptable interval. 
     Success for application of such management tools that may exist or are foreseeable depends on several key factors including but not limited to the ability to dynamically allocate a subscriber-based job or work order to the appropriate installation or maintenance technician without the need to waste valuable time in returning to a maintenance facility location, the ability of the installation and/or maintenance technician to implement tasks required by the job or work order, the ability to guide the technician through the complex task of qualifying an installation by quantifying critical operational system parameters or simply verifying effectiveness of work performed, the ability for the installation technician to close the subscriber-based job or work order, the ability of the system to store and forward test results to a central facility, the ability to make the information available to Broadband Communications System Management and the ability to forward a subsequent job or work order to the technician while in the field but, preferably, only upon verification of correct, complete and effective work being performed at a current job site. It can be readily seen that substantial improvements in overall Broadband Communication System in all of these areas is fundamentally dependent on substantially real-time collection and distribution of accurate test results to the operator and to facilities for performing analyses and caking actions required to achieve the above-enumerated and other capabilities. 
     Referring now to  FIG. 2 , a high-level schematic overview of the architecture of the test system in accordance with the invention is illustrated. In  FIG. 2 , reference numeral  100  generically depicts any of elements  10 ,  12  or  14 - 18  of  FIG. 1  which may carry broadband communication signals to or from central facility  110  which are to be observed during testing and which include any or all of the test points A-H of  FIG. 1  to which testing device  120  may be connected by a suitable connection arrangement such as a cable and suitable connector  130 . Testing device  120  is preferably in communication with a laptop or other portable type personal computer or a special purpose, dedicated controller  140  having display and manual data entry capability similar to that of a personal computer over a short-range bidirectional communication link  210  such as may be provided by a “Bluetooth” standard device, inductive coupling link (e.g. near-field standard device), Wi-Fi, an arrangement for connecting to a wireless mobile Wi-Fi “hot-spot”, wireless telephony or the like or may be detachably hard wired using universal serial bus protocols and connections. Testing device  120  also preferably includes some test data analysis capability at least to the extent of detecting abnormal or out-or tolerance test results. 
     Controller  140 , of course, must include a complementary communication structure for establishing link  210 . Further, controller  140  is optionally but preferably in communication via Wi-Fi, wireless telephony, radio transmission or the like with a preferably archival storage arrangement  110 ′ that may be provided in a central facility, distribution hub or the like of the cable system and/or in an independent central facility providing storage analysis and/or documentation services to a plurality of cable systems over a communication link  220  which is preferably wireless at least in part using wireless telephony, wireless messaging VoIP, Wi-Fi, possibly in connection with an arrangement for providing a mobile Wi-Fi “hot-spot”, or the like. Controller  140  also preferably contains a programmed processor capable of performing analyses of test data; preferably in somewhat greater detail and comprehensiveness than is provided in testing device  120 . 
     Testing device  120  preferably is constructed in a housing which may be small and compact since it need only accommodate a battery for power, arrangement  130  for hardwired connection to a test point, a programmable microprocessor and measurement circuitry controllable thereby (e.g. filters, spectrum analyzer, comparators and the like), at least one but preferably two connection ports  122  such as a universal serial bus (USB) port(s), preferably a wireless communication module or circuit capable of short range communications (e.g. Bluetooth, Wi-Fi or the like), a power switch and one or only a few indicators  126  such as light-emitting diodes sufficient to indicate status (e.g. on/off, stand-by/active testing states, test interruption/detected error and the like) as will be discussed in greater detail below. Such a device can be constructed in a very robust and rugged structure since it has no internal moving parts and electrical components can be provided on a very few integrated circuit chips which may be assembled on a circuit board which provides a very compact and rugged assembly. Ruggedness can be enhanced, if desired, by potting the circuitry or portions thereof in resin, foam or the like or using similar structural expedients. Otherwise, the physical aspects of the testing device are not at all critical to the practice of the invention and can be freely chosen to enhance convenience of handling and use. 
     Controller  140 , as alluded to above, is physically separate from the testing device  120  and is preferably a commercially available laptop, notebook, or palm-top personal computer or commercially available object tracking device as alluded to above but may, advantageously, be a dedicated device since much of the structures and functional elements which would normally be included in a fully functional portable computer or even a palm-top device capable of wireless communications to a network may be unnecessary and can be eliminated to reduce cost and weight while some adaptations to improve convenience of field use may be included. That is, controller  140  need only have the capabilities of receiving operator input, issuing commands, displaying returned test results, supporting communication links  210  and  220  and possibly storing and transmitting test program sequences as will be discussed in greater detail below. Further, a special purpose controller device  140  may have an advantage in being incapable of functioning for other, more general purposes and thus be less likely to be put to unintended uses or to have commercial value outside the system of the invention (e.g. to deter theft or incur unauthorized wireless telephony charges). On the other hand, as alluded to above, laptop and palm-top devices are currently carried into the field by technicians for communication purposes and additional functionalities (e.g. upgrades) may be desired that could be implemented by programming of a commercial, general-purpose computer that might be precluded or require hardware changes in a dedicated device. 
     Some advantages and possible improvements in system performance and security may also be achieved with a dedicated device by using a communication protocol which is specific to the communication of test data or a particular deployment of a testing system. For example, a proprietary or otherwise unique transmission code or communication protocol specific to a particular system instance and/or anticipated data can potentially decrease communication length and/or prevent a competitor from compiling statistics on performance of a given distributed system. Nevertheless, a portable computer is suitable for use as controller  140  in the practice of the invention, even if not optimally convenient or secure. 
     The invention does not usually require any change in constitution, of existing systems including Broadband Communication System facilities, distribution hubs or storage facilities for system performance data other than to provide extended data collection and analysis capabilities as will be discussed in greater detail below. Broadband Communication Systems, in particular, will generally include equipment having the capability of receiving data by wireless telephony and storage of collected performance data. However, if optional communication link  220  to central facility  110 ′ is employed, as is preferred, some wireless telephony, VoIP or the like interface should be provided as part of the BCS central facility  110 . On the other hand, it should be understood that since communications link  220  is wireless, it is unimportant to the successful practice of the invention whether the data collection, analysis, dispatching, installation qualification and the like are provided as part of a given system or these functions provided at a single independent facility  110 ′ or small plurality thereof as a service to a larger plurality of otherwise independent systems  100 ,  110  as is, in fact, preferred since numerous economies can be achieved. Both of these possibilities or a combination thereof are depicted by dashed lines and a dashed arrow connecting the BCS central facility and the storage analysis an management central facility  110 ′ supported by and forming part of the present invention. 
     It is also preferred, as part of central facility  110 ′, to centrally provide for technical analysis of test result data and the capability of providing additional diagnostic testing sequences automatically if normal test sequences and remediation techniques do not achieve a suitable level of performance when testing and repairs are being performed. Additionally, the analysis can confirm that the installation or maintenance work is complete, correct and effective for the purpose of qualifying an installation and/or closing a work order; allowing communication of a new work order to the technician. Further, both the test data and the results of technical analysis (before or after storage) can be communicated to a facility for collecting statistics and/or performing further and different types of analysis for management purposes and to support additional system capabilities, as alluded to above. Providing some or all of these functions centrally as a service to a plurality of systems also promotes consistency of performance provided by otherwise independent distributed systems. 
     Referring now to  FIGS. 3 and 4 , the preferred architecture and methodology in accordance with the invention will now be described in detail. It should be understood that only portions of the architecture and methodology which support operations and usage of the invention in a currently preferred manner and in accordance with the basic principles and objectives of the invention are illustrated and discussed. Other capabilities using the same or additional elements will be evident to those skilled in the art and may be included at will as may be desired, particularly in combination with other instrumentation that may be appropriate to other capabilities of the distributed system or test equipment of interest. For example, controller  140  could include additional elements to generalize its control function to devices other than testing device  120 . 
     It may be helpful to note that both  FIG. 3  and  FIG. 4  are divided into three columns by dashed lines. The left column of  FIGS. 3 and 4  illustrates the basic constitution and function, respectively, of the test device  120 . Similarly, the center column of  FIGS. 3 and 4  illustrates the constitution and function, respectively, of controller  140 . Likewise, the right column of  FIGS. 3 and 4  illustrates the constitution and function of a central facility or the like  110 ′ (or central facility  100  of the distributed system insofar as it involves the present invention). It should also be understood in the following discussion that some elements of  FIG. 3  may be illustrated in a duplicated form using more or fewer elements than are illustrated in a manner that is intended to increase clarity. For example, more or fewer indicators  126  may be used to indicate testing device status. Similarly, the four ports illustrated and indicated by reference numerals  122 ,  122 ′ and  122   a  could be embodied in a single (e.g. USB) plug and socket arrangement while provision of only two such ports is deemed preferable; one for accommodation of a hardwired but detachable connection for control signals or for battery charging while the testing device  120  is not in use, and the ether for accommodating an external storage device  150  for downloading of test procedure instruction sequences from, for example, a thumb-drive, which could, alternatively, be provided from storage  305  over one of the connectors  122   a  or connection  122  or wireless link  210  as circumstances and user convenience may dictate. 
     It is preferred that testing device  120  be powered by a rechargeable battery  310  with power delivered, to the respective constituent elements thereof through switch  124  (which may be indicated by an LED  126 ). Battery  310  may be recharged from a schematically illustrated power source  315  which may include connection to power distribution mains and a power converter (schematically illustrated as a diode) and a charging voltage supplied, to battery  310  through connection  211 ′. As a practical matter, however, connection  122 ′ would preferably be embodied by connector  122 , preferably in the form of a USB port commonly used for charging cellular telephone handsets but which could be used for downloading data or communicating commands from the controller  140  since it is unlikely that communication of programming or commands would be desired concurrently with battery charging. 
     When testing is anticipated (and battery  310  properly charged), both the testing device  120  and controller  140  are powered up as indicated at steps  411  and  421  of  FIG. 4  such as by closing switch  124 . Such provision of power in the testing device could be indicated by an indicator  126  connected thereto. Once power is supplied to both the testing device  120  and controller  140 , wired or wireless communication link  210  is established either autonomously (e.g. by a bluetooth arrangement) or by processors  311  and  322  as indicated at steps  412  and  422  of  FIG. 4 . Optional communications link  220  may also be established concurrently and is assumed to be established throughout the remainder of this discussion. Then, using communication link  210 , loading of appropriate test sequences (as may, for example, be determined from a work order for installation, repairs, upgrades, modifications or the like) is controlled from controller  140  as illustrated at step  424  of  FIG. 4 . Such control is generally asserted by a manual input from keyboard  321  but may be automated in response to a transmission from a central assembly or distribution hub  110 ′, either of which may issue a command to processor  322 . Control from a central facility is particularly useful where detailed analysis and diagnosis is performed at a central facility or distribution hub  110  which may specify a particular, specific and specialized test protocol be performed; programming for which can be downloaded to storage  326  using processor  322  in controller  140 . In response to such a command, processor  322  issues a command which is communicated to wireless/wired port interface  323  which communicates appropriate signals (i.e. the signal protocol used is unimportant to the successful practice of the invention) to wireless/wired port interface  314  over wireless link  210  or a wired connection through port  122  and one or more commands are preferably buffered at buffer  313  and communicated to processor  311  in turn. This buffering allows several test protocols and/or repetition thereof to be specified in advance to allow substantially autonomous operation of the testing device  120  once testing is initiated. Then, under local control of processor  311 , the desired test sequence instructions, which may comprehend one or more long sequences of test procedures, can be downloaded from the controller  140  (from memory  305  to internal memory  150 ′) or from an external memory such as a so-called thumb-drive  150  and preferably stored in memory. Alternatively, testing device  120  can be operated directly from external memory  150  if the thumb-drive remains connected to testing device  120  (in which case, memory  150 ′ could be omitted or reduced in size to function principally as an instruction buffer) but such a mode of operation is not preferred in view of the rigors of field testing which could cause external memory  150  to be dislodged and testing to be thus disrupted. 
     The operations and functions described above enable the testing device  120  to perform whatever tests may be deemed appropriate to the work desired to be performed on the distributed system and which are performed prior to any test being performed and, preferably before the testing device  120  is connected to any test point. Accordingly, the operations described above are referred to collectively hereinafter as a pre-use phase of operations as distinct from a testing phase, as is illustrated by a horizontal dashed line across the left and center columns in  FIG. 4 . Provision of a distinct, pre-use phase has several advantages in that loading test sequence instructions before use allows the test sequence instructions and analysis parameters to be updated from time to time as the expected measured parameters of the distributed system may change. Further, downloading test sequence instructions reduces the likelihood of corruption of such signals and increases the likelihood that any corruption of such signals will be discovered. Additionally, since some test sequences will be common to different regions of the distributed system as well as different test points at a given work site, as described above, one pre-use phase may suffice for a plurality of work orders at a plurality of different work sites and thus a pre-use phase may be performed much less frequently than a testing phase. Moreover, a given system may exhibit certain types of problems much more often than others and which are revealed by test sequences which should be normally performed whenever any type or one of certain types of work is performed on the distributed system while some diagnostic testing sequences may be performed only rarely. Therefore, loading of test sequence instructions which are specific to and common in regard to certain types of work allow those sequences to be rapidly performed from an instruction memory of very limited size while rarely performed sequences can be downloaded from memory  305  or from, for example, a central facility or distribution hub  110 ′ as may be needed. 
     The test phase of operation of the invention begins with connection of the testing device  120  to a test point such as those described above through attachment of connector  130 , as depicted at step  415  of  FIG. 4 . Commands for individual test sequences are normally issued from processor  322  in response to manual input at, for example, keyboard  321 . (As is well understood in the art, other input arrangements such as voice commands or selection from displayed menus or the like may be alternatively or additionally employed.) Such commands are transmitted through wireless/wired port interfaces  323  and  314  to processor  311  which then extracts the corresponding test sequence instructions from internal memory  150 ′ or external memory  150  and controls test circuitry  312  comprising spectrum analyzers, filters, comparators and the like as is well-understood in the art to perform tests and capture data reflecting particular operational parameters of the distributed system, as depicted at steps  416  and  417  of  FIG. 4 . In general, raw data is transmitted from test circuitry  312  and correlated and categorized and placed in a suitable format for transmission by processor  311  and then conveyed through wireless/wired port interlaces  314  and  323  and communication link  210  or connection  122  to processor  322  where they may be stored in internal memory, and/or memory  305  from which they may be displayed and/or transmitted. The captured data may be buffered or transmitted in real time to controller  140  where they are displayed to the user and, preferably transmitted to the central facility or distribution hub  110 ′ as depicted at step  427 . 
     It should be appreciated that in view of the potential length of test protocols and sequences thereof, it is common to initiate a sequence of test protocols and allow the testing device to proceed autonomously, possibly with programmed pauses to provide time, for the technician to disconnect from one test point and reconnect to another test point. For the same reason of potential test sequence length, it is generally provided for testing to be interrupted or halted when abnormal or out-of-tolerance test data is encountered. It should also be noted that some degree of analysis of the test data that may differ in degree of thoroughness is preferably provided at each of the testing device  120 , controller  140  and central facility  110 ′. That is, analysis at the testing device  120  may only be a pass/fail or go/no go determination while the analysis at controller  140  may be sufficient to provide diagnosis of routinely encountered problems and to suggest remediation or confirmation procedures and full diagnosis and possibly generation of special purpose testing protocols may be performed only at central facility  110 ′. 
     By the same token, it is often the case that the technician will move the testing device  120  without moving controller  140  and may even exceed the range where communication link  210  can be maintained. Therefore it is preferable to provide some non-volatile storage  311 ′ in the testing device to store test data that cannot be immediately transmitted. By the same token, it is convenient and preferred to provide indicators  326  capable of indicating not only on/off condition of the testing device but whether or not it is in an active testing or stand-by state (e.g. to confirm response to a command to initiate testing) and also whether or not testing has been halted due to abnormal or out-of-tolerance test results and the state of communication link  210 . Other conditions such as successful connection to a test point could, of course, be included or alternatively provided. Similarly, it is convenient and preferred to allow some control by the technician at the testing device  120  to at least control re-initiation or resumption of testing from the tester such as by detecting a short interruption of power or a momentary contact included within the power switch in a manner which is not critical to the practice of the invention and may be implemented in a wide variety of ways as will be evident to those skilled in the art. 
     Based on the displayed test results the user/operator of the test system may perform work and possibly report the work to the central facility or distribution hub  110 ′. If work is performed based on results of testing, the test may be and typically would be repeated by looping to  426 . If test data is transmitted to the central facility or distribution hub, as is preferred, it may be analyzed as illustrated at step  437  and instructions issued or, if acceptable, the work order may be closed and another work order issued. Alternatively, if the test results are not within nominal limits, additional diagnostic tests and test sequence instructions may be issued and downloaded to the testing device  120  through processor  322  as described above and depicted at step  438  followed by step  426  (in the pre-use phase of operation) as described above. The user may run the additional diagnostic tests before and/or after further work is performed by issuing a command corresponding thereto as described above. When test results are acceptable, use of the testing device ends and the work order may be closed and the test results stored; allowing personnel to be directed to another work site where the invention can be used again as described above, often without requiring repetition of the pre-use phase operations described above. 
     Further, as a perfecting feature of the invention which is not necessary to its successful practice in accordance with the basic principles thereof, both acceptable and unacceptable test results and information concerning aspects of the performance of work orders (e.g. collected from identifications of tests performed which also infers work performed and time stamps of transmissions on links  210  and  220 ) may be collected and/or distributed to a facility  439  or over a network connection for classification, statistical compilation and management analysis to support management decisions, scheduling, dynamic allocation and dispatching of appropriate technical personnel (e.g. by training and ability as well as proximity to a new work site) without requiring return to a maintenance facility for re-assignment and installation or maintenance equipment projecting service time windows for subscribers and the like as alluded to above. 
     In view of the foregoing, it is clearly seen that the invention provides a light weight, simplified and inexpensive testing system for a distributed system and which is particularly convenient and advantageous for application to a Broadband Communications System. The testing system in accordance with the invention avoids redundancy of structure between stand-alone testing devices and commercially available portable computers that have been used for communication of test results to a central facility and management of work orders. The apparatus of the test system allows numerous operational and safety advantages (e.g. avoiding an ohmic connection from a test point to a controller  140 ) and can be fabricated as extremely rugged structures that may be freely adapted to provide a high level of convenience to a user in a variety of environments of use. The methodology of use can also be rapidly executed while allowing simplification and limitation of circuitry required to provide a high degree of flexibility of use. The invention also supports and preferably include an infrastructure for distribution and analysis of any aspect of Broadband Communications System performance for distribution and analysis of data collected at any point, end-to-end of the system to support virtually any management function that may be desirable to promote efficiency of the Broadband Communications System and its operations 
     While the invention has been described in terms of a single preferred embodiment, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the appended claims.