FR2776878A1 - Telecommunications network state supervision system - Google Patents

Abstract

The system supervises the state of the network connected to a central unit (CCI) collecting the information (Def Inf) concerning the deficiencies of connection of the network and generating data (Loc) of the location of these deficiencies. There is a system state monitor (MTR) with a table (TAB) displaying two dimensional deficiency locations supplied through an interface (INF).

Description

STATUS SUPERVISION SYSTEM

OF A TELECOMMUNICATION NETWORK

  The present invention relates to the field of systems for monitoring the operating status of telecommunications networks, in particular telephone networks. There are known centralized telecommunications network monitoring systems capable of managing and exploiting information concerning the operating state or deficiency of network links, which make it possible to ensure the maintenance of the

  network by requiring interventions.

  In particular, for the switched telephone network, there is a management and operating system, developed by the Dassault Company, which constantly analyzes the state of the telephone lines in the network. This system, called "MIRABEL" (acronym for "Machine Interconnecting Subscriber Claims and Line Tests"), coordinates intervention requests on telephone lines and

telephone line tests.

  As illustrated in part of FIG. 1, this computer system comprises, in known manner, a central CCI unit, called Information Collection Center, connected to management terminals TG, TG2, TG3 (or regional units) arranged in

regional agencies.

  Indeed, in the case of the national telephone network, the network is centralized around national and regional agencies, each region being divided

  into sectors, themselves subdivided into local centers.

  When a subscriber reports a telephone line fault or requests a line connection, or the "MIRABEL" system notices a line failure, the CCI central unit of the system identifies the line number and stores the number identification and deficient status in a database. The identification makes it possible to locate the region, the sector and the center to which the

deficient line.

  After locating the deficient lines, the CCI central unit for collecting information establishes a regional work plan defining, for each center, the interventions to be carried out. The load plan is communicated to the TG terminal of management of the regional agency concerned so that interventions are

  carried out on site by technical teams.

  In each agency, a referral agent is responsible for mobilizing and distributing the technical teams according to the location and importance of

reported deficiencies.

  The referral agent must therefore interpret the load plan, appearing on the SCR screen of the terminal TG, which gives a list of centers locl, loc2,

  ., locN of localization of the deficiencies of lines to distribute geographically and in order of priority the teams..DTD: techniques in an optimal way.

  In fact, the referral agent must regularly interrogate the CCI central unit from its TG terminal so that the load plan is updated and reveals recent line deficiencies, so

  to take this into account in its distribution of teams.

  It is of the utmost importance that the distribution of teams is made judiciously, to limit interventions and respect recovery times

  or connection, or to meet appointments.

  Such monitoring systems pose a problem for the referral agent in interpreting deficiency computer data to distribute

  maintenance teams geographically.

  Another problem for the referral agent is the difficulty in determining from the computer data the urgency or the hierarchy of

deficiencies to be treated.

  Finally, the referral agent must request the workload plan himself to see it displayed on the screen. The system therefore has the disadvantage of not making it possible to observe the evolution of the load plan in

real time.

  An object of the invention is to provide a system

  to remedy such problems.

  In particular, the object of the invention is to facilitate and optimize the work of guidance agents and maintenance teams or

  installation of trunks.

  Briefly, these aims are achieved, according to the invention, by associating with the system, a display monitor making it possible to display the location of the network link deficiencies on a two-dimensional table advantageously representing a geographic plan of the intervention areas. In addition, the invention provides for displaying different visual signals to distinguish whether the deficiencies relate to priority type links or secondary type links, or even if the deficiencies require interventions of link maintenance type or of construction type. liaison; this in order to advantageously determine

  the emergency order of interventions.

  The invention is implemented with a state supervision system of a telecommunication network connected to a central unit collecting information concerning deficiencies in network links and generating location data for the deficiencies, with the particularity that the system includes a monitor for viewing the state of the network, the monitor comprising a two-dimensional signage table with means for displaying on the board the location of the impairments, and an interface capable of processing the location data of the impairments and of delivering signals Sgn

  display for the rating table.

  Preferably, the monitor includes means for displaying the type of impairment, the interface being able to process data concerning the types of impairment. Preferably, the table represents a plan of

intervention areas.

  Preferably, the table includes a matrix

visual indicators.

  Other features, purposes and benefits of

  the invention will appear on reading the description

  and the drawings below, given only by way of nonlimiting examples. In the appended drawings: - Figure 1 represents a diagram of supervision system according to the invention, - Figure 2 represents a functional diagram of interface of supervision system according to the invention, - Figure 3 represents an example of table with means for displaying the location of deficiencies implemented in a supervision system according to the invention, - Figure 4 shows an example of a location coding table and type of deficiencies used by a supervision system according to the invention, - FIG. 5 represents an electronic diagram of an embodiment of the supervision system interface according to the invention, - FIG. 6 represents a timing diagram of data transmission provided in a system according to the invention, - the Figures 7a, 7b, 7c, 7d and 7e represent timing diagrams of display signals used by a system according to the invention, - Figures 8, 9, 10 and 11 represent flowcharts of alg orithms implemented by a

  supervision system according to the invention.

  The preferred embodiment of the supervision system, described below, is intended to be implemented with the "MIRABEL" system and then applies to a telephone network, although the invention is not

  not limit to such an application.

  It is expected that the CCI system, TG which collects information concerning network link deficiencies, generates Loc data for the location of link deficiencies, preferably accompanied by Typ data concerning the type of deficiency. Indeed, in addition to identification, the system can determine an order of priority. For example, telephone lines can be ranked in order of priority, depending on whether they serve emergency services (firefighters, hospitals), on-call services (medical office, etc.), professional subscribers or residential subscribers. We will consider here to simplify that the lines are classified in two

  categories, either priority or secondary.

  In addition, the system can distinguish several cases of impairments. For example, a deficiency may concern a faulty telephone line, the subscriber having reported the fault, or may concern the absence of a telephone line, a connection request having been made by a future subscriber. Depending on the case, the intervention to be carried out corresponds to a line maintenance operation or to a line construction operation. It is important that the operator can distinguish the causes of impairments for

  distribute maintenance and construction teams.

  The type of impairment data can thus give indications relating to the category of the deficient link (priority or secondary line), and / or relating to the cause of the deficiency (line in

  maintenance course or line under construction).

  Within the meaning of the present, a deficiency can correspond either to a link failure (line fault) requiring a maintenance operation, or to a lack of link (request for line connection) requiring a construction operation. The invention provides for integrating into the CCI system, TG

  an MTR monitor for viewing the network status.

  The MTR monitor can be connected to the system in several ways. In FIG. 1, we see the monitor thus receiving data on the location of the deficiencies and the type of deficiency by

  through the regional unit TG.

  Alternatively, the monitor and the regional unit TG can be connected separately (therefore in parallel) to the central unit. In addition, the regional unit TG can be omitted and the MTR monitor can be linked directly and

  in isolation from the CCI central unit.

  As shown in FIG. 1, the MTR monitor comprises, according to the invention, a two-dimensional TAB signage table and an INF interface capable of processing Loc data for the location of deficiencies. As illustrated in FIG. 3, the TAB table preferably represents a plan of the intervention zones, in the form of a geographical map representing the region 39 covered by the agency, with the indications of the DOL, ARB, LLS, CHG and SCL centers. (the subdivision into sectors and centers is not represented for the sake of

simplification).

  In the preferred embodiment, the table includes a set of light-emitting diodes Dl, D3, ..., Dll respectively located at the location of each center on the card 39, each diode D3 serving to display the state of deficiency of the corresponding ARB center. The table therefore preferably includes a matrix of visual indicators, used to display the location of deficiencies and to monitor the operating status of the entire regional agency network. Other display means on the board may however be provided, such as lamps, lights, flags or any signaling means

  within the reach of the skilled person.

  The essential advantage of the signage table is to allow the referral agent to immediately visualize the geographic location of the deficiencies in order to judiciously distribute the teams.

techniques.

  In addition, it is expected that the table preferably includes visual indicators delivering different visual signals corresponding to different types of impairments. Thus, a pair of diodes D and D ′ of different colors is installed at the location of each center on the map 39 of the table TAB in FIG. 3, in order to distinguish the category of the deficient lines. A red diode D, for example, signals the presence of a priority line deficiency in the corresponding center, while the other diode D 'of another color, orange or green for example, signals the presence of a deficiency of secondary line in the corresponding center. The table then includes a

  double matrix of distinct visual indicators.

  The advantage of such a measure is to allow the referral agent to immediately view the category or type of deficient line in order to

  determine an order of priority for interventions.

  Visual indicators can still deliver continuous or flashing signals depending on the type of line impairment. We can thus distinguish different causes of impairment, such as the fact that a

  line either under maintenance or under construction.

  For example, a flashing diode signals that the deficiency corresponds to the construction of a line, while the diode signal is continuous when a line is being maintained in the corresponding center. Consequently, in the preferred embodiment, it is provided that each diode D makes it possible to distinguish the following four cases of deficiencies: - ND case, absence of deficiency in the center, the diode is extinguished; - ML case, at least one deficiency in the center due to line maintenance, the diode is lit continuously; - CL case, at least one deficiency in the center due to line construction, the diode is flashing; and, in the ML + CL case, at least two deficiencies in the center, a first deficiency being caused by a line being maintained, another deficiency being caused by a line being constructed, the diode is lit alternately continuously and flashing, the continuous and flashing phases succeed each other cyclically. Such an alternative of discontinuity of visual signals advantageously combines with the alternative of coloring of visual signals to distinguish a

  more types of linkage deficiencies.

  Thus, the combination of four cases of priority line deficiencies with four cases of secondary line deficiencies of a center gives sixteen cases of deficiencies listed in the right part of the Code table in Figure 4. This part indicates the coding

  Typ of the types of network link deficiencies.

  In FIGS. 4, the columns to the right of the Code table indicate the flashing states Clig or continuous Cont of the pair of diodes D and D ', states which

  correspond to the sixteen cases of impairment.

  The Hexa column in the Typ part gives an example of hexadecimal coding of the types of deficiencies which the CCI, TG system can distinguish and which it transmits in the form of digitally coded data to the INF interface.

of the MTR monitor.

  The Code table in FIG. 4 also gives on the left side Loc a simple example of binary bin and hexadecimal Hexa coding, CTR centers where deficiencies can be located. Such digital codes allow the CCI, TG system to transmit data on the location of deficiencies to

the INF interface of the MTR monitor.

  The INF interface of the MTR monitor, according to the invention, then fulfills the following functions: - receive the data supplied by the system, check the data transmissions and alert the system in the event of a transmission error, - update regularly and automatically the data provided by the system, - visually and distinctly display the line deficiencies corresponding to each center, - differentiate the priority line deficiencies from the secondary line deficiencies, and possibly distinguish from other

types of impairments.

  FIG. 2 illustrates a block diagram of the operation of the interface INF, according to the preferred embodiment. There are four main operating stages: - a DAT REC stage for receiving the data supplied by the SYS system, - a DAT PROC stage for processing and converting the data received, - a MATR DISP stage for displaying the reported deficiencies in the matrix, and - an IND TST step for testing visual indicators

of the display matrix.

  DAT REC reception of data is preferably

  performed in real time with the "MIRABEL" system.

  The MTR monitor regularly interrogates the CCI, TG system to regularly receive and update the Loc location data and the Typ data.

type of impairments.

  The DAT PROC processing of the data provides for converting the Loc, Typ of location and type of deficiency data into Sgn display signals intended for the corresponding indicators of the display matrix. When the processing is complete, the DAT PROC block can give an authorization signal Aut to the DAT REC block for receiving data to interrogate

  again and update the data.

  The MATR DISP matrix display must be of sufficient size to cover the number of regional agency centers. Typically, an agency monitors a hundred centers, and a matrix of 256 indicators, i.e. 128 pairs of red and green diodes

  D1, D2, ..., D128, Dl ', D2', ..., D128 'may suffice.

  A test of the IND TST indicators is planned so that the referral agent checks the proper functioning of the

Bulletin board.

  FIG. 5 illustrates an example of a functional electronic diagram allowing a simple practical realization of a monitor interface according to

the invention.

  A MAT matrix comprising 128 diodes D1 to D128 is partially represented in the diagram in FIG. 5. Each diode D is connected, between a line of high potential (horizontal lines of FIG. 5), on the anode side, and * a line of low potential (lines

  vertical in Figure 5), cathode side.

  Each high potential line, which supplies sixteen diodes D1, D2 etc. in this embodiment, is connected to a positive supply terminal VCC via a respective transistor T21. The diodes D1, D2, ... or ..., D127 and D128 of a horizontal line are therefore supplied only when the

  transistor T21, ... or corresponding T28 is conducting.

  As an option, as shown in horizontal dashed lines in FIG. 5, secondary lines of high potential can be provided, intended to supply diodes D1 'to D128' (of a different color from diodes D1 to D128) so as to produce a double MAT matrix of 256 visual indicators. The high potential secondary lines are likewise connected to the positive supply terminal VCC via transistors T31, T32, T33, ..., T38, respectively. Each low potential line serves eight or sixteen diodes Dl, Dl ', D17,

  ., D113 in this example of double MAT matrix. The low potential lines are connected to a negative supply terminal VDD via transistors T1, T2, T3, ..., T16, respectively. The diodes Dl, Dl ', ... and D113 of a line are therefore not crossed by a supply current..DTD: when the corresponding transistor T1 is blocked.

  Thus, to light a diode, D17 for example, it is necessary to unblock two transistors, the positive supply transistor T22 and the transistor T1

negative feed.

  In this example of an electronic diagram, the transistors T21 to T28 and T31 to T38 are PNP type transistors having a transmitter connected to the positive supply VCC, a collector connected to the corresponding high potential line and a base which receives a signal. control. The PNP type transistors T21 to T38 are therefore in the on state (unblocked) when the

command at a low level.

  According to this example, the transistors T1 to T16 are NPN type transistors whose transmitter is connected to the negative supply VDD (which can be connected to ground, and whose level is then conventionally zero), the collector is connected to the corresponding low potential line, and the base receives a basic signal. The basic signals of the transistors T1 to T16 are supplied respectively by logic gates INV1 to INV16 which each reverse a control signal. The NPN-type transistors T1 to T16 are therefore in the on (unblocked) state when the command has a low level. In the embodiment of FIG. 5, the control signals supplied by circuits DMX1, DMX2 and / or DMX3 are thus active for

a low level.

  The control circuits DMX1, DMX2, DMX3 are multiplexers or more precisely "demultiplexers", that is to say multichannel circuits transmitting the electrical signal 0 coming from an input channel to an output channel chosen from among several exit routes. Each DMX circuit therefore has a role of binary decoder. In this embodiment, the signal of the input channel of each DMX1, DMX2 and / or DMX3 circuit is continuously in the low logic state 0 to activate the selected NPN and PNP type transistors. The choice of the output channel is determined by the binary number applied to inputs A, B, C, D. Buffer interface circuits (in English "buffer"), comprising non-inverting logic gates, can be inserted between MC microcontroller and each circuit

  DMX1, DMX2, DMX3 (not shown in Figure 5).

  It is planned to send a binary number to inputs Ai, Bi, C1 and D1 of the DMX1 control circuit to activate the low potential line corresponding to the number received. Another binary number is sent to inputs A2, B2 and C2 of the DMX2 control circuit for

  activate the corresponding high potential line.

  In this exemplary embodiment, the bits A2, B2, C2 and Ai, Bl, Cl, Dl of the binary numbers are provided respectively by the outputs pc0, pcl, pc2, pc3, pc4, pc5 and pc6 of a parallel PC port d '' a microcontroller

MC provided in the interface.

  Advantageously, it is possible to provide that the bits of each location code Loc correspond to the binary row and column numbers of the center concerned. According to the example of FIG. 5 thus, three least significant bits of the Loc code suffice to select the line or the pair of lines among the eight lines or eight pairs of lines represented; similarly four most significant bits of the Loc code suffice to select the column from the sixteen columns represented. By judiciously matching the seven bits of the location codes Loc with the bis A2, B2, C2 and A1, B1, CI, Dl of binary number of row and column of the diode of the center concerned, the microcontroller should advantageously perform

  no conversion from Loc code to binary numbers.

  By sending a binary number to the PC output port of the MC microcontroller, we can therefore select a high potential line and a low potential line and therefore light the corresponding diode Dl to D128

of the MAT matrix.

  It is planned to send to inputs A3, B3 and C3 of a third DMX3 control circuit, similar to the DMX2 control circuit, the same binary number as on the inputs A2, B2 and C2. When the binary number is sent to the PC output port of the microcontroller, two lines of high potential are therefore selected.

  same number in the double MAT matrix.

  Advantageously, by sending a single binary number to the PC port, a pair of diodes is therefore selected from among the pairs of diodes (D1, Dl ') to (D128, D128') of the matrix in a single step of calculating the microcontroller. The possibility of lighting a single diode of the selected pair (D, D ') is however possible by sending adequate validation signals to respective inputs V2 and V3 of validation of the control circuits DMX2 and DMX3. The signals V2 and V3 for validation of the circuits DMX2 and DMX3 are preferably supplied by two outputs pa5 and pa4 from another port PA of the microcontroller MC. On the other hand, the DMX1 circuit is preferably permanently activated by connecting the validation input Vl to the supply terminal VDD

low level.

  It will be noted that according to such an embodiment, a single diode D or a single pair of diodes D, D 'of the matrix MAT is activated at a given instant, each circuit DMX1, DMX2, DMX3 being able to activate only one

only one of its exit lines.

  It is in fact provided that the display signals Sgn are delivered sequentially by

  the INF interface of the MTR monitor according to the invention.

  The microcontroller thus selects one by one the diodes D (or pair by pair D, D ') which must be lit by calculating the binary number pc0 to pc6 and

the pa4, pa5 validation bits.

  Surprisingly and advantageously, the sequential activation of the diodes D or pairs of diodes D, D 'for a certain time does not give the impression that

  the LEDs are lit in turn.

  It is indeed possible to activate the diodes in a sequence fast enough to give

  the illusion that the diodes are permanently on.

  This optical illusion is possible thanks to the persistence of retinal impressions of the human eye which lasts more than forty milliseconds, by providing that the activation sequence of the diodes to be lit has a shorter duration. The display of impairments is then almost simultaneous for the human eye. MC microcontrollers generally have a sufficiently high speed for the scanning sequence of all the binary codes pcO-pc6 of the matrix to last a few tens of microseconds, duration less than a millisecond in any case. The particularity of the display program is to provide for an interruption of the scanning sequence of the matrix when a diode D or a pair of diode D, D 'must be lit. Whenever a diode D and / or D 'must be lit, the microcontroller MC interrupts the sequence of the scanning program and applies validation signals V1, V2 and / or V3

having a certain duration.

  The duration of the validation signals, therefore the duration of the interruption of the scanning, is both long enough for the selected diode D or pair of diode D, D 'to receive sufficient energy to light it, and short enough to that the human eye does not perceive a fluttering effect even

  when several diodes are to be lit.

  The duration of the validation signals is thus of the order of a few hundred microseconds or

a few milliseconds.

  The diode ignition cycle then takes place in a time corresponding to the duration of each interruption multiplied by the number of interruptions (that is to say the number of pairs of diodes to be activated) increased by the duration of the scan sequence

(generally negligible).

  As the number of linkage deficiencies to be displayed on the matrix of the table is generally reduced at a given moment, the diode ignition cycle is advantageously carried out in a time less than the retinal persistence time of the human eye. For example, if the system must display deficiencies in a dozen centers in the intervention area, and it is expected that the validation signals last for one millisecond, the cycle of switching on the diodes of the matrix is carried out in ten milliseconds (the duration of the scanning sequence less than a millisecond is very negligible), time much less than the forty milliseconds of retinal persistence. In this example, each diode or pair of diodes in each center with a deficiency receives electrical current for one

  tenth of the time, which allows its ignition.

  Alternatively, provision may be made for the monitor to include means for simultaneously displaying the locations of deficiencies. Such an alternative is suitable if the execution time of the microcontroller program is too slow or if it is expected that a large number of deficiencies can be displayed in

same time on the board.

  To make such an alternative, each diode can be replaced by a loop comprising a capacitor and a diode mounted in reverse or a logic flip-flop circuit relaying and blocking the

  ephemeral level of control signals.

  To light the selected diodes continuously or flashing, or alternating continuously / flashing, it is advantageously provided that the microcontroller MC applies preprogrammed display signals to the validation inputs V2 and V3

  DMX2 and DMX3 control circuits.

  It has been established previously that each diode D can give the following visual signals: - diode D off, - diode D on continuously, - diode D flashing, - diode D alternately flashing and on

continuously.

  FIG. 7 illustrates the timing diagrams of display signals c0, cl, cp and cc corresponding to the four types of preceding visual signals. The display signals c0, cl, cp and cc are preferably generated continuously by a subroutine executed by the microcontroller MC. The signal c0 is permanently in an inactive state, for example a low level 0 state, so as to leave a diode D of the pair D, D 'selected off. The signal cl is permanently in an active state, for example a state of level 1 high, so as to continuously light up the diode D or the pair of diodes D, D 'selected. The signal cp is a periodic state signal, the signal being in the active state (level 1 high) during a first part p of period P and the signal being in the inactive state (level 0 low) during a second part of the period P which lasts for a few seconds. The cp signal allows the selected diode D or D to flash. Said cp signal is used to generate the cyclic dc signal. The DC signal is in the active state (level 1 high) during the first part C of cycle C so as to continuously light up the selected diode D or D ', then the DC signal takes the same state as the signal Cp at the end of cycle C to allow the flashing of the

LED D or D 'selected.

  Advantageously, the preprogrammed signals cO, cl, cp and cc are supplied to a main program of the microcontroller MC to simply validate the inputs

  V2 and V3 of the DMX2 and DMX3 control circuits.

  The main program of the microcontroller MC applies the signals cO, cl, cp and cc according to the data concerning the types of deficiencies received by the interface. The data transmitted by the system is preferably presented as indicated in the code table of FIG. 4 in the form of a pair of numbers.

binary Loc and Typ.

  The first binary number Loc of the pair corresponds to a location code of the center Ctr (or of the sector Sctr) concerned by a link deficiency. The second binary number Typ of the pair indicates, in coded form, the type of deficiency, that is to say the category of the link (priority or secondary) and the cause (maintenance or construction) of deficiency. In the coding example in Figure 4, the numbers Loc and Typ are coded on one byte, but this

coding is only exemplary.

  It is advantageously provided that each first binary number Loc is an odd byte, the least significant bit is always at state 1, and that each second binary number Typ is an even byte, the least significant bit always being at state 0, to avoid any confusion between the location and type of impairment codes. The data transmission between the CCI system, TG and the INF interface of the MTR monitor can be carried out via a parallel link or according to a preferred alternative, in the form of

serial transmission.

  An advantage of serial transmission is to allow communication over a distance greater than the parallel link. Various serial transmission frameworks can be adopted, such as a simplex link (successive one-way communications), a half-duplex link (successive two-way communications), a duplex link (simultaneous two-way communications) or a full duplex link (two-way communications

improved).

  An advantage of serial transmission by simplex link is that it requires a small number of connection wires between the system and the monitor, a single wire sufficient to transmit the transmissions in one direction and then

  in another, the mass being connected elsewhere.

  As illustrated in FIG. 6, an asynchronous serial transmission is preferably carried out according to the RS232 protocol. The Loc and Typ data of location and type of deficiency are for example transmitted in the form of pairs of binary codes Datal and Data2 which follow each other so that the indication of a deficient line location is immediately

  followed by an indication of the type of line impairment.

  The series of pairs of binary codes containing the deficiency information of each center in the region is preferably received by the microcontroller MC

  on a serial input port (not shown).

  The transmission of the series of pairs of binary codes is conventionally preceded by a binary code indicating the start of the series, for example a byte having the hexadecimal code EE; transmission ends conventionally with a binary code indicating the end of the sequence, for example a byte

having the hexadecimal code FF.

  In the case of a regional agency supervising the operation of a hundred centers, and coding of the data on one byte, the transmission of all the information comprises a data sequence of about two hundred Bytes and generally reaches a duration less than a second. The microcontroller program MC of the INF interface can then regularly interrogate the system with a

  periodicity of the order of a minute, for example.

  An advantage of the supervision system according to the invention is to provide for regular updating of the data and to make it possible to treat the deficiencies

in real time.

  FIGS. 8 to 11 finally show in the form of flowcharts, an example of an algorithm for programming the microcontroller of the interface of the supervision system according to the invention. The understanding, implementation and adaptation of the flowcharts of FIGS. 8 to 11 are within the reach of those skilled in the art, and the flowcharts will not be

  detailed here, except for the indications below.

  FIG. 8 illustrates a main program flow diagram, in which it is planned, for each of the centers, N in number, to execute a blinking subroutine, before converting and transferring the Loc data for localization of deficiency to the PC port which selects the visual indicator (s) from the center, then convert and transfer the Typ type of impairment data to the PA port which

  validates the lighting of the selected indicator (s).

  Figure 9 illustrates a flowchart of the sub-

  flashing program, which changes the state of the validation signals cp and cc, as illustrated in FIGS. 7c and 7d. Y and Z counters indicate the flow of the flashing half-period p, flashing period P, alternating half-cycle c

  continuous / flashing and cycle C of the alternation.

  FIG. 10 illustrates a TIMER interrupt program which authorizes, at regular time intervals R of time T, and for a duration S, the reception of the data transmitted to the interface. FIG. 11 illustrates another SERIE interrupt program which manages the loading of Data data whose number 2N is twice the number N of centers in the region. The SERIE program is executed when the system sends the data and provided that the TIMER interrupt program authorizes reception. Other embodiments, aims, characteristics and advantages will appear to a person skilled in the art, without departing from the scope of the present invention,

  the scope of which is defined in the claims below

after.

Claims (10)

  1. Telecommunication network status monitoring system (NET) linked to a central unit (CCI) collecting information (Def Inf) concerning network link deficiencies and generating data (Loc) for locating the deficiencies , characterized in that the system comprises a monitor (MTR) for viewing the state of the network, the monitor comprising a two-dimensional signage table (TAB) with display means (D1, Dl '...) on the board of the localization of deficiencies, and an interface (INF) capable of processing the data for localization of deficiencies and of delivering display signals (Sgn) for the rating table.   2. Supervision system according to claim 1, characterized in that the monitor further comprises display means (D, D ', cont, clig) of type of impairment, the interface being able to process data (Typ ) regarding the types of impairments of the network.   3. Supervision system according to claim 1 or 2, characterized in that it comprises a regional unit (TG) connected on the one hand to the central unit (CCI) and on the other hand to the monitor (MTR), l regional unit providing regional data (Loc, Typ) for localizing deficiencies and / or type of linkage deficiencies.   4. System according to one of claims 1 to 3,   characterized in that the table (TAB) represents a   zone plan (DOL, ARB, LLS, CHG, SCL) of intervention.   5. System according to one of claims 1 to 4,   characterized in that the table (TAB) comprises a matrix (MAT) of visual indicators (D1, Dl ', D2, ..., D128, D128').   6. System according to one of claims 1 to 5,   characterized in that the table includes visual indicators (D, D ') delivering different visual signals corresponding to different types of link deficiencies.   7. System according to one of claims 1 to 6,   characterized in that the monitor (MTR) includes means (MC, DMXl, DMX2, DMX3) for delivery   sequential display signals (Sgn).   8. System according to one of claims 1 to 7,   characterized in that the monitor includes means for simultaneously displaying the locations of the deficiencies.   9. System according to one of claims 1 to 8,   characterized in that provision is made for the display signals (Sgn) delivered by the interface (Inf) to validate at least one circuit (DMX2) for controlling a matrix (MAT) of diodes (D1, ... , D128), the control circuit selecting a group (T28) of diodes (D113, ..., D127, D128) of the matrix, and that the display signals are generated from an inactive state (cO) , of an active state (cl), of a periodic state signal (cp), and of an alternately active (cont) and alternately periodic (clig) cyclic state signal (cc), the alternation having a cycle (C) of the order of a few seconds.   10. System according to one of claims 1 to 9,   characterized in that the central unit (CCI) is a machine coordinating requests for intervention on telephone lines and tests of telephone lines.