BE657120A - - Google Patents

Description

  

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  "Test set-up of the equipment of an automatic central office".



   The present invention relates to a test set-up for the equipment of an automatic central office and more particularly to a set-up for the automatic production of an automatic central office.

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 internal testing of test and measurement table equipment! for a telephone switching system. ;
The main object of the present invention is to provide an arrangement for automatically performing the internal test of the equipment of the test and measurement table for a central office equipment of a telephone switching system. 'in a more efficient and economical way.



   In accordance with the present invention, a connection is established through the switching network of a telephone switching system from a test and measurement table to a called line, so that the attendant at the table of tests and measurements can carry out an internal test of the equipment, that is to say the solicitation of the equipment of the central office for. a given line from the test table in order to verify thus whether the switching equipment can establish a connection to the line in question. therefore, additional switching equipment is not required to establish this test connection from the test table to the called line.

   A relay circuit is provided to connect a shunt circuit to the terminals of the cut-off relay of the line circuit associated with the line in question, in response to a ground signal coming from a test of the test and measurement table. via a test and measurement link circuit. The shunt circuit is a low impedano relay connected in parallel with the cut-off relay by means of a non-meshed relay network which chooses @ particular line circuit from the group of lines. This relay then forces the cut-off relay to reset, thus connecting the line relay to the switching stages, in order to initiate a call, while maintaining the original connection from the test and measurement table to 'to the line in question.

   If the equipment is functioning satisfactorily, a second connection is established to the line relay, in

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 thus increasing the current to the cut-off relay and also to the low impedance relay, which forces the low impedance relay to operate and thus free the common equipment.



  The non-mesh relay network eliminates the need to switch an additional control line through the switching stages for each call, since the non-mesh relay network only operates during a call from the table. 'tests and measurements.



   Other objects and features relating to timing in the test and measurement link circuit, which generates a. time signal of ground pulses in response to a manually applied ground pulse signal from the test and measurement table, indicating that the internal test should be established, while a complete elimination of mass indicates a state of liberation.

   This duration circuit allows the test and measurement table attendant to check a switching system using the new setup, just as he would test an electromechanical point-to-point switching system, because the manually applied pulse, which is used to reset the cut-off relay in a point-to-point system via a separate control line, is used by the duration device to be incorporated into the new assembly.



   The above-mentioned objects and other particularities of the present invention, as well as the manner of attaining or obtaining these, emerge from the following description of an embodiment of the present invention. invention, which makes it possible to better understand the latter and which is produced in conjunction with the accompanying drawings comprising Figures 1 to 11, in which Figure 1 is a block diagram of the test communications setup of the systematic test installation

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 and the test and measurement table; FIG. 2 is a block diagram of a switching, telephone system;

   Figures 3-10 include, in the arrangement shown in Figure 11, a schematic and functional diagram of the test communications setup of the systematic test facility and the test and measurement table.



   The invention is hereinafter described in accordance with the following general structure
 EMI4.1
 
<tb> '<SEP> PART <SEP> 1. <SEP> ORGANIZATION <SEP> OF <SEP> SYSTEM
<tb>
<tb> PART <SEP> 2 <SEP>. <SEP> TYPICAL <SEP> CALL
<tb>
<tb> .PART <SEP> 3. <SEP> TEST <SEP> COMMUNICATIONS <SEP> OF <SEP> THE TEST <SEP> INSTALLATION
<tb> SYSTEMATICS <SEP> AND <SEP> OF <SEP> THE <SEP> TABLE <SEP> OF TESTS <SEP> AND <SEP> OF <SEP> MEASURES
<tb>
<tb> PART <SEP> 4. <SEP> TABLE <SEP> OF TESTS <SEP> AND <SEP> DISTRIBUTOR <SEP> OF TESTS
<tb>
<tb> .. <SEP> PART <SEP> 5. <SEP> CONNECTOR <SEP> OF TESTS <SEP> AND <SEP> OF <SEP> MEASURES
<tb>
<tb> PART <SEP> 6. <SEP> INSTALLATION <SEP> OF SYSTEMATIC <SEP> TESTS <SEP> AND <SEP> CONNECTOR
<tb> SYSTEMATIC
<tb>
<tb> PART <SEP> 7. <SEP> INLET <SEP> CONNECTOR
<tb>
<tb> PART <SEP> 8.

   <SEP> OPERATION <SEP> OF A <SEP> TEST <SEP> COMMUNICATION.
<tb>
<tb>



  PART <SEP> 1. <SEP> ORGANIZATION <SEP> OF <SEP> SYSTEM.
<tb>
 



  Referring now to Figure 2, the system consists of the Line Group 100, the Group Selector 300, the Transceiver / Recorder Group 600, and the Translator 700.



  There is also a bundle of junctions 500 which provides access, incoming junctions to recorders and an 800 control center which contains a special computer for an analysis and recording operation and equipment for the grading of the logger. For a detailed description of the system in general and of the 100 line group, reference can be made to the following US patent applications:
K.K. Spellnes, Serial No. 230,887, filed October 16, 1962;
M.H. Espereeth, K.K, Spellnes, W.R. Wedmore and F.



  Sikorski, Sériai? 240,497, filed November 28, 1962;

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1
W.R. Wadmore, Series No. 304,892, filed August 27, 1963. '
All electronic equipment is provided in duplicate; For example, two row group markers 200 can serve up to ten row groups and two group selector markers 400 can serve up to ten group selectors. A minimum of two bundles of transceivers 600 is provided per office and the translator 700, including the magnetic drum 730 and the logic circuit, are always provided in duplicate by ten thousand call numbers.



   Time division techniques are used in the # transceiver group 600 and in the translator 700. For a detailed description of the transceiver group, reference may be made to the following US patent applications:
B. Sherstiuk, Serial No. 280,053, filed May 13, 1963; B. Sherstiuk, Serial N 304.827, filed August 27
1963;
D. Lee and H. Wirsing, Serial No. 308.112, filed on. September 11, 1963.



   Markers are known on an electronic basis and semiconductor circuits are used throughout the system. Ferrite core memory is used for temporary storage, while magnetic drum 730 is used for semi-permanent storage.



   The split switching elements in the temple of the system consist of reed relay matrix assemblies in 10x6, 10x5 and 10x4 shapes. The crossing points consist of leaf capsules and normally have two windings. They are mounted on a two-layer printed board and the entire assembly forms a matrix of

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   switching. In some cases, the boards are wired together to form a single, larger matrix. The system contains no conventional telephone relaia, but similar functions are performed by reed relays.

   A reed relay assembly is essentially a bundle of reed magnetic elements controlled by coil windings and with or without a permanent magnet. For a more detailed description of the reed relay assemblies and the crossing point matrix assemblies, reference may be made to the following US patent applications:
 EMI6.1
 m E.J. Glennex and K.K. Spellnes, Switching Networks t. Ads Cross, Serial 3,127,237, filed Jul 27, x .; ¯ ..; yehyk that A. Taliste. Dry Blade Relay, Would be "127.0,% ,, filed July 28, 1961; 'É.Ài Gr: ta' d. David and R. (?. Stoehr, Assembly ¯,: - of Printed Cartons at Malr.oew trial NO 132,897, filed August 21, 1961.



   The electronic logic circuit employs eight standard circuits as building bloos. These standard circuits include NI disoriminators, inverters, flip-flops, clocks, discriminated pulse amplifiers, a parallel test circuit, a parity circuit, and reed relay control. All of these circuits are effective on double-sided or single-sided printed boards measuring 6 inches (15.24 cm) by 5-1 / 2 inches (13.97 µm).



   The two switching stages, the group of lines and the group selector do not need to be installed in the same building. The line group can be housed in a remote location and therefore function as a satellite office.

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 lite. No recorder-transmitter is required in the satellite, but a transceiver is provided for transmitting and receiving switching information between satellite markers and main office recorders-transmitters.



   The signaling process between the groups of the system is carried out by the so-called two-phase technique. This process makes use of a phase shift technique for serial transmission and reception of the pulses.



   In conjunction with the transceiver group and translator, the group selector can function as a tandem tandem office and, for this purpose, the trunk group is not required. By using six blade capsule dies per cross point, the group selector marker can serve as a four wire switch.



   The reason for this flexible operation of the system is that the group of recorders-transmitters present; You sufficiently, in conjunction with the storage in the translator, of the features incorporated for the operation described above.
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  PART 2. TYPIJUE APPEAL. As an introduction to the operation of the system, a brief description of a local call ty 0, .. as handled by the system, is now given. Io of figure 2 can be consulted for the route of When a subscriber lifts the handset, the mlw 1 $ r of the group of lines 200 first of all comes into action by de-marking the outgoing call, by identifying the line call you and choosing a free recording connector in the transceiver. A route is then established temporarily from the calling station to the recording connector via the A, B, C and R matrices and the subscriber receives the line signal.



  The dialed digits are stored temporarily, coded and the

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 processing is continued as these digits pass to translator 700, are analyzed for the type of incoming call, and instructions are selected from drum memory 730 and returned to transceiver 600 for guidance. further processing of the call. Upon receipt of the remaining digits, translator 700 sends back switching instructions corresponding to the called number, as stored in drum memory 730. The instructions are transmitted from transceiver 600, via l 'one of the outgoing line group transmitters and outgoing connector, up to the group selector 300.

   In the group selector 300, the instructions are analyzed by the marker 400, a free arrival connector in the group of arrival lines is located and a route is established to this group of lines via the matrices A, B and 0 of the group selector. The remaining instructions are followed by the line group marker to locate the terminating heads of the called line, to choose and request a route from the incoming connector, through the matrices E, D, B and A, up to the called line.



  The inbound connector establishes ringing, answer monitoring, and talk battery for the two births when the call is answered.
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  Since the system is a counter-common operation, the line group markers and the ')',) groups selector function only to serve the assigned part of call processing and then become available to serve '; '' other calls. The transceiver 600 and translator .0 operate on a time division basis and internally handle multiple calls simultaneously. Temporary signaling and 80n% 'control conversation paths, maintained by connectors and switching matrices. 't

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 EMI9.1
 x,:. IGn'âI ': 11. 0 Eâ "x, L 'IW5TAT, LATION D' ESSAt '7x.1 i! I' 'iÎl; 4l'ÜûJ i i aÎii lr tt A 3lair' i û 3? J1 x AND J5 MESURAS.



  Referring now to Figure 1, the eyateae is provided with a facility to verify the external screening facility, subscriber base and central office equipment. some part of this verification can be done from the Danish central office 920 test table. In a single office central and in some multiple hard central the test table is connected to the central office.
 EMI9.2
 test distributor system, "0, and the linkage circuit" 10 'easa18 and measurements, which is connected to the test distributor 910 benches in the same office. A point-to-point test connector can also be connected to the test bench.
 EMI9.3
 contacts of the test distributor 10, so that the point-by-point team can also give access to the Scottish table 920.

   The aim of this test distributor is to choose the own test and measure link circuit or test connector associated with one or other of the groups of 100 lines in an office. The purpose of the test and measure link circuit, or the test connector, is to select the line to be tested from a particular group of 100 lines. The attendant at the es- table
 EMI9.4
 know and measures coacose a first digit to advance the test die 910 vertically and then a second ohif- fre to rotate the distributor to a proper position allowing access to a test link circuit and menu- res or the test connector,
Then, three additional digits are dialed for access to a given line for verification purposes.



   The Easy and Measurements 510 connector is one of the incoming junctions of the 500 Junction Harness, which is connected via matrices A and E to the logger-transceiver group 600 under the control of the 550 marker of the jono harness. - tions. The 510 test and measurement connector is connected,

 <Desc / Clms Page number 10>

        / the KIF distributor, to the input circuit 310 of the group selector #e 300, and from this to the IDF distributor, via matrioes A, B and C of the group selector under control.

   of the marker 400 of the group selector * A connection is thus established to an incoming connector, which then establishes the incoming connection via the switching matrices E, D, B and
A, under the control of line group marker 200, and from this incoming connector to the particular line circuit of the line to be checked. The test table 920 can thus establish.
 EMI10.1
 e metallic oonneotion tells a given line of subscriber C, - .. ', verification goals *, "I.' \ Similarly, the installation of systematic eseaia '1: \;>,'; 'x 4 {"'Qb11r a connection via connector 20 of the like.-;. ,,,,, la. * .. "'1 \ 1., a systematic of the bundle of junctions 500 soue ... the oontl'? 'U., ::::' ,: '-'." '1:' <$ .. of this bundle of junctions.

   Connector 20 of the it1Q t ;;; :: "':::"' '' '' \ ,: ï 'Systematic testing is another inbound junction of the ...:' \ j 1 '! Lotions 500 which initiates a connection through input circuit 32, a particular group of 100 lines in the system via matrices A, B and C of group selector 300 and from that group to the IDF splitter. The arrival aonneotion is similar to the arrival number for a call from the test and measurement table.



   Systematic Test Facility 930 thus establishes a direct metallic connection to a line of the group of 100 lines for verification purposes. In addition, the 930 systematic test facility sequentially has access to each line in the group of 100 lines, while maintaining the connection from the 930 systematic testing facility to the incoming connector and removing only the connection. from the incoming connector to the line in question when accessing a new line.

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  PART 4. TEST TABLE AND TEST DISTRIBUTOR.



   Referring now to Figure 3, the test table 920 is a conventional test and measurement table consisting of test circuits 3000, call disk 3050, relay 3F1 and of different keys and lamps. The test distributor 910 is a conventional test distribution circuit, as de- fined in the US patent? 2,866,008, see assay distributor 600 shown in Figures 6 and 7. Test distributor 600 can be used in this system in substance as shown, but nevertheless with a minor modification. The M line has been added from the R770 relay to each test and measurement connector connected to the 910 test distributor, without being connected via the oontaot benches.



  This added connection is necessary to allow the test distributor to work with both a point-to-point test connector and a test and measurement connector due to an incompatibility of the two types of system. . In a point-to-point system, the EC line is connected directly from the test distributor to the called line and, therefore, the ground is returned almost immediately to the test distributor to actuate the R770 relay in case the called line is busy. However, in a system that does not constantly switch the EC line from a calling party to a called line, the R770 relay will recover (after a slow tripping interval) before the markers determine that the called line is busy.

   The R770 relay must be activated when the earth is returned, via the EC line, to the blocking relay R770, indicating an occupied state, because the EC line is coupled to the R770 relay via its own contacts 772 ' . Therefore. the earth forces, via the line M, the relay R770 to be activated, so that the earthing can force, via the line EC, the relay R770

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 to be blocked, thus indicating a state of occupation.



  PART 5. CONNECTOR. TESTS AND MEASUREMENTS.



   Referring now to FIG. 4, the test and measurement link circuit 510, which is one of the arrival connectors of the junction harness 500, provides access to the system from the control table. tests and measurements 920, via the test distributor 910. The test and measurement table can have access to the system, in order to verify; a line and, in addition, the test and measurement link circuit includes a 4LS relay to sense a busy line and to trigger automatically when the line becomes free.

   It can be noted that this 4LS relay can also be used in other types of link circuits to pick up a busy line and to trigger automatically when the line becomes free, establishing a new connection from another calling line to to the line in question.



   The test and measurement link circuit 920 also solicits the marker 550 of the connection harness when the test and measurement connector is requested to establish a connection to a free recording connector. Then, the call disc impulses are detected and repeated at the recording connector in order to establish a connection to the called line via the group selector 300, the army connector and from this line to the group. of lines. The test and measurement connector also maintains the incoming motor and, consequently, the group selector matrix via the DHW line.



   Relay 4A is actuated in response to receiving the pulses from the call disc, which relay then repeats the pulses from the call disc via the TR and RR lines to the arrival recorder connector. 624. relay 400 is'.) Control relay which operates when a connection is

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 blie to a free recording connector.

   Relay 4BY is a reed relay, differentially wound, which operates in response to either a ground signal or negative battery potential, via the BY line from the connector. recorder, thus designating either a state of occupation by the trunk, or alternatively a state of line occupation respectively. Relata 4LBY operates and locks up in response to relay 4BY during a line busy condition to connect relaia 4LS to terminals * of TS and RS lines.

   Therefore, the 4LS relay remains connected to the terminals of the TS and RS lines, even after releasing the recorder connector which forces the 4BY relay to reset * The 4LS relay is the ball deviation relay which operates in series. with the battery supply relay for the line / ocup that is to be checked. This relay has a diode bridge associated with it, so that the relay operates even with different battery polarities present on lines T and R, that is to say the bell, eto. This relay remains in action as long as the line to be checked reate is busy.



   As soon as the busy line becomes free, the 4LS relay is reestablished and thus forces the 4LBY relay to reestablish itself. Restoring the 4LBY relay forces the 4EC relay to operate and send a signal to the test and measurement table *
920 via the test distributor 910, indicating that the line to be checked has become free, -The 4TBY relay is an interurban call relay which indicates that a long distance busy state is 'is produced. Relay 4B operates in response to actuation of relay 4A upon request by the test and measurement table and remains in action as long as the test and measurement connector is requested.

   The 4Ct relay is the trigger relay which is activated when a connection is established to a recording connector and also when a connection is established to the line which

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 must be checked by means of the incoming connector.



   The 4TP relay is a time relay which provides a delayed-time mass pulse on the DHW line by designating the performance of the internal test of the equipment * When the test and measurement table activates the BCO 3010 key, the 4EC relay is reestablished, thus eliminating the mass of the line
DHW and opening the circuit to the 4TP relay.

   Since the relay
4TP is slow to trigger, the ground is reconnected to the line
DHW in 50 milliseconds (slow tripping interval of the 4TP relay), thus designating the performance of the internal test. This ground pulse in time is detected in the marker of the group of lines and distinguished from a deolen signal.
 EMI14.1
 @@@ ement which is the complete elimination of the mass of the @@ line should be noted that the mass pulse in time is generated pr, "t 50 milliseconds, without taking into account the fact that the ole BCO 30 '1 "' -t triggered so that the attendant at the test table and to carry out the internal test of the equipment, exactly from j '>.

   ^ way as for a point-to-point system or as for 1 system described in this memo.



     PART 6. INSTALLATION # 'SYSTEMATIC TESTS AND CONNECTOR
SYSTEEMATIC.



   Referring now to Figure 5, the systematic test set-up 930 includes test circuits 510, a two-phase transmit unit 515, a memory unit 516, and other control circuits. The System Test Facility 930 aooedes a group of lines for verification purposes by initially issuing call disk pulses through the +00 and -OC lines. Then the two-phase transmitter
515 issues switch digits for access to a particular called line for verification purposes.

   Divided unit 515 chooses each number in a group of 100 lines from memory unit 516, via the rotary switch.

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 513, with its associated 5MM motor magnet. As soon as the test has been performed for a given line by test circuits 510 via the + T and-T lines, the relay 511 operates and thus disconnects the ground of the EC line to remove the connection from the connector of arrival to the called line. Likewise, ground is connected to the 5MM motor magnet to advance the rotary switch 513 for access to another set of switch digits from the memory unit 516 for transmission through the. two-phase transmitter 515 via the + T and-T lines to the group of lines.

   Then a new connection is established to another line of the same group of 100 lines and, from then on, relay 511 is reestablished to provide a hold ground via the EC line for the new connection. Upon unwinding as soon as each row of the group of 100 rows has been assigned, a negative potential is applied to the EC row to thereby indicate a tripping state from the test circuit 510.



   The systematic connector 520 is in substance similar to the test and measured connector 510, except that the line occupancy and interurban occupancy relays or a test and time relay. measurements are not necessary. Likewise, an additional control relay (EC) is not necessary, paroe that it is not essential to have a disconnection of the EC line at the incoming connector.

   Likewise, relay 500 has an additional winding for
 EMI15.1
 block relay 5C0, as soon as the transmitter-recorder group has been triggered, with a view to eapéoherb, thus relay 500 to bypass the relay's maintenance path,., 5BY, consisting of the mass via the lasting contacts 5B, of the upper winding of the reais 5BY, the lower winding of the relay 5BY and the resistor 5B3 at negative potential. The remaining relays 5A, 5B and 50T perform the same functions (as their

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 corresponding relays in the test and measurement link circuit 510.



  PART 7. INLET CONNECTOR.



   The incoming connector is shown schematically in FIGS. 7, 8 and 9. It provides access to an output of the group selector, via the intermediate distributor IDF, by the connector, and from the latter by the matrices. E, D, B and A, to a called line.



   The battery is supplied to the calling line by relay 8BF and to the called subscriber by relay 9BF.



   The "oooupé-free" indication is provided on the IT line for use by a parallel test circuit in the group selector marker.



   The relay 7TJS ensures, when it is activated, a route from the TO and RO conductors to the TC and RC inverters, and completes a route from the transmitter, via the transmission route, to 'to the transmission-reception circuit in the marker. This relay is activated under control of the marker by a signal on the TJ line.



    , The 7TJS relay also completes a route for the coded ringer signals from the send-receive circuit on conductors A, B, C and D to the ringer control relays SA, 8B, 8C and 8D.



   The connector is requested by the mass propagated via the ECO line in order to activate the 7S relay. This relay completes, through its contacts 4, a ground path in order to maintain the previous switching train and completes, through its contacts 1, a ground path in order to maintain the subsequent switching train.



   The operation of one or more relays 8A, 8B,
8C and 8D apply one of five different frequencies of sound-

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 nery to conductor T or conductor R in order to provide a fully elective ringing bridged to five subscribers or divided among ten subscribers, in accordance with the binary code received on lines $ A, B, C and D, as shown in the table below -after:

     
 EMI17.1
 
<tb> A <SEP> B <SEP> C <SEP> D <SEP> General <SEP> connection <SEP> Ring <SEP> frequency <SEP>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb> 0 <SEP> 1 <SEP> 0 <SEP> 1 <SEP> T <SEP> F1
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb> 1 <SEP> 0 <SEP> 0 <SEP> 0 <SEP> R <SEP> Pl
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb> 0 <SEP> 1 <SEP> 0 <SEP> 0 <SEP> T <SEP> F2
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb> 1 <SEP> 1 <SEP> 0 <SEP> 0 <SEP> R <SEP> F2
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb> 0 <SEP> 0 <SEP> 1 <SEP> 0 <SEP> T <SEP> F3
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb> 1 <SEP> 0 <SEP> 1 <SEP> 0 <SEP> R <SEP> F3
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb> 0 <SEP> 1 <SEP> 1 <SEP> 0 <SEP> T <SEP> F4
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb> 1 <SEP> 1 <SEP> 1 <SEP> 0 <SEP> R <SEP>? 4
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb> 0

  <SEP> 0 <SEP> 0 <SEP> 1 <SEP> T <SEP> F5
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb> 1 <SEP> 0 <SEP> 0 <SEP> 1 <SEP> R <SEP> F5
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb> 0 <SEP> x <SEP> 1 <SEP> 1 <SEP> T <SEP> F1
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb> Special <SEP> functions. <SEP>,
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb> 1 <SEP> 1 <SEP> 0 <SEP> 1 <SEP> Return <SEP> from <SEP> the <SEP> line <SEP> occupy <SEP> (60 <SEP> IPM)
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb> 0 <SEP> X <SEP> 1 <SEP> 1 <SEP> No <SEP> <SEP> response provided <SEP> (OFC <SEP> is working)
<tb>
<tb>
<tb>
<tb>
<tb>
<tb>
<tb> 1 <SEP> x <SEP> 1 <SEP> 1 <SEP> No <SEP> response <SEP> provided <SEP> or <SEP> ringtone <SEP> (OFC) <SEP> and
<tb>
<tb>
<tb>
<tb> metallic <SEP> trigger <SEP> (SPC <SEP> is working).
<tb>
 



     The callback signal from the source on the RBT conductor is supplied to the calling subscriber during the ringing process. The busy signal from the IPM source 60 is supplied to the calling subscriber when the own binary code, as mentioned in the table above, is received from the marker to activate the 9BT relay.



   In response to the response monitoring ringing being triggered, the 8RT1 relay operates and these simple working contacts bypass the winding of the 8RT2 relay, which connects the calling subscriber to the voice transmission path. The 9BF relay then operates and applies,

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 by its contacts 2, a mass which .'extends, by the breaking contacts of the relay 90 FC, to the ECO line in order to repeat the monitoring of the rethinking of the preceding switching train.



   In response to one of the codes, as shown in the table above, the 9SPC and 90FC relays operate to provide a metal path (T and R) free of accessories and suspend the response and ringing monitoring. view of a verification, that is to say the table of tests and measurements and the systematic communications. In response to another code, the 90FC relay operates to suspend monitoring of the response to calls to official numbers, eg, the telephone company office.



   The release of the subsequent switching train can be checked by the systematic test facility 910.



   Opening the @@@@ frees the subsequent switching train, but maintains @ the incoming connector. This incoming connector is released when a negative battery potential is applied to the ECO line.



   The release of the previous switching train is delayed - approximately 135 m @ liseconds after the calling subscriber disconnects, in order to protect against an unintentional interruption of the calling station.



   The set deoonnection of the previous switching train and the terminating connector is scheduled 30 seconds after the called subscriber disconnects.



   An arrangement is provided to allow the called subscriber to maintain the subsequent switching stream and the terminating connector.



   PART 8. HOW A TEST COMMUNICATION WORKS.



   Referring now to Figures 3-10, arranged as shown in Figure 11, a test call of the test and measurement table can be initiated from the table.

 <Desc / Clms Page number 19>

 920, via the test distributor 910, up to the test and measurement connector 510, with a view to accessing a given line, -Likewise, each line of a group of 100 lines can be acoédée for purposes of verification from the system of systematic tests 930. via the systematic connector 520, The test call of the test and measurements table is initiated manually via the table of 920 tests for a given line, while the 930 systematic test facility automatically and sequentially accesses each line in a group of 100 lines.



  CALL OF THE TESTS AND MEASUREMENTS TABLE.



   The test and measurement table 920 requests a row given by the key 3010 of the active distributor, thus forcing the relays D and A in the test distributor 910 to operate in series. Then two digits are dialed from the call disc 3050, which causes the switch of the test distributor to advance one stage vertically and another stage in a rotary manner, thus connecting the test distributor 920 to connector 510 of the test and measurement table via the contact bank of the test distributor 910. As mentioned previously, the M line is directly connected from the test distributor 910 to the connector 510 of the test and measurement table without going through the contact bench.

   Then, three additional digits are dialed from the call disk 3050, which are repeated, via the test distributor 910, at lines + OPR and. -OPR to connector 510 of the tests and measurements box. Relay 4A operates and thus forces relay 4B to operate and to apply marker 550 of the junction bundle. This junction beam marker 550 attracts the cross points for the A and B matrices by closing a circuit through the cross points via the contacts of the 4TBY, 4t, BY, 4CT and 4A relays in

 <Desc / Clms Page number 20>

 series with resistor R1 at the MFV line of marker 550 of the beam of junctions.



   As soon as the crossing points have been made, a connection is established from connector 510 of the test and measurement table to the input recorder connector of the recorder-transmitter group. This free recorder connector then forces relay 4CT and 400 to switch on as soon as the connection has been established. Then, relay 400 provides a ground on the MFV line to indicate to the trunk marker that the connection has been made.



   Subsequently, the test and measurement table 920 dials the three digits necessary to reach a given line called. Relay 10A repeats these call disk pulses through the TR and RR lines to the record connector.



  Pulses from the call disc are stored in the group of transceivers and then translated. The switching digits are sent via the TS and RS lines to the KIF distributor and from it to the group selector. The connection is established by the group selector via the connection points A, B and 0 at the incoming connector. The first three digits, from the transmitter to the transmit-receive circuit 1000 of the line group marker 200, select the terminating head of the line and the fourth digit is normally used for ring control, but , in this case, it designates a special call.

   Since this is a special test call, relay 7SPC is actuated to provide the metallic trip path, in response to coded information transferred from transmit-receive circuit 1000, via lines A, B, 0 and D, to relays 8A, 8B, 80 and 8D. The connection is more established at the switching stages of the group of lines, via the cross points E, D, B

 <Desc / Clms Page number 21>

 and A to the line circuit for the called line. Likewise, the EC line is connected to the marker via the CE line to relay 10A.

   In addition, the information from the transmit-receive circuit 1000 causing the 01WC and 10WD relays to activate, thus forcing the line identifier 1010 to be connected to the non-mesh network to relay 1020 and to operate and maintain the relay. non-meshed network at relata 1020 respectively. This non-mesh relay reed 1020 connects the WC line to an individual line circuit, so that the relay part of the test and measurement plate of marker 200 of the group of lines, comprising the relata 10A, 10B , 10C, 10DWC, 10HD and 10WC, can perform internal test.



   When these connections have been established, the terminating connector determines which line the called subscriber is free and then returns an indication from that line to the group of recorders-transmitters. Therefore, the 4CT relay is activated from the recorder connector and is blocked via the CS line. Then the group of transceivers and the logger connector are disconnected, thus forcing the 4CO relay to reset.



   Test table 920 therefore has a direct metal paroura from test circuit 3000, via lines a + T and-T, to the called line and therefore the external line can be checked. It is now assumed that the tests of the external line are satisfactory and that the attendant at the test and measurement table can initiate the internal test of the equipment by operating the BCO 3070 key which forces the relays. A and D of the 910 test distributor to recover.



   The re-establishment of relay D and consequently of / relay L causes the elimination of the earth of contacts 781 of the line
EC, thus forcing relay 4EC of connector 510 to reset and measures. Therefore, the mass is

 <Desc / Clms Page number 22>

   The DHW line is removed and the 4TP relay winding is open to the circuit. However, the 4TP relay does not restore, since it exhibits a slow triggering characteristic.



     However, the ground, removed from the ECS line, forces relay 10A of marker 200 of the group of lines to operate in series with relay 9S of the incoming connector. This incoming connector remains stressed by keeping relay 93 active, which forces the earth to be connected to the CO line and to the C line,

   so that the start connection of the connector tries and measures at the incoming connector and the incoming connection to the @@@@@ sctor / to the called line remain blocked by means of the earth connected to the Cross-point holding windings for the group selector switch matrices and for the row group switch matrices. Relay 10B of marker 200 of the line group is activated via ground by the contacts of relay 10HD and is blocked via its own contacts.

   However, the 10A relay bypasses the relay
10B via the contacts of relay 10A. Relay 10B is slow to trigger and relays 10A and 10B coerce, when actuated, relay 10C to operate.



   Assume now that the 4TP relay of the test and measurement controller 510 resets after a delay of 50 milliseoondes, which is usually a shorter time than the manual trip time of the BCO 3070. of the test and measurement table. The earth is reconnected to the DHW line via the break contact of the 4TP relay. Therefore, the ground is connected to the ECS line and, from oelle-oi, to the ECO line to the incoming connector.

   Since the trip time for relay 10B is greater than
50 milliseoondes, relay 10B of marker 200 of the group of lines remains active and relay 10A is reestablished. 11 must be

 <Desc / Clms Page number 23>

 noted that relay 100 remains active, even if relay 10A recovers, because the circuit to relay 10C is closed when relays 10B and 100 are energized.



   When relay 10A is re-established and relays 10B and 0 are activated, relay 10 DWC is thus connected to relay 1000 of the line circuit associated with the called line via the WC line and the non-meshed relay network 1020 .



  Then the T and R lines are shorted from the cir-
1 test output 3000 from the test and measurement table 920. in order to simulate that a call has been made by the called line. Relay 10L is therefore activated to request the equipment and establish a call, as if the called line initiated a call.



   It is now assumed that the called line can successfully produce an outgoing call. Hence, the line signal is fed back, via lines T and R, to test circuits 3000 of test panel 920, thereby denoting a successful internal test of the called line. In addition, two connections are now established via the switching stages of the line group, an incoming connection from the test and measurement table and an outgoing connection from the line air-outlet. Therefore, two connections are made to relay 1000 and since these connections are in parallel, the current to relay 10DWC is increased, thus forcing the ODWO relay to activate.

   Therefore, the ground is connected to the line BOU-0 indicating that an occupancy state has occurred and that, therefore, the marker is triggering. The ODWC relay also bypasses relay 100, thus forcing this relay 100 to re-establish itself. Relay 100 restores and opens the circuit to relay 10DWC. The 10DWC relay recovers and forces the 1000 relay to activate, thus forcing the 10L relay to reset. The 10L relay is reestablished

 <Desc / Clms Page number 24>

 to disconnect the outgoing connection from the called line. Therefore, the internal test can be undertaken again by manual operation of the key BCO, 3070 at the test and measurement table 920.



   As soon as a satisfactory internal test has been carried out and the operator at the test and measurement table wishes to release the entire connection, the + T and-T lines are disconnected by re-establishing key 3010 on the device. distributor. Consequently, the starting part of the switching stages of the group of lines is restored to permanently disconnect the ground of the line.
EC, which forces relay 10A to activate and to borrow relay 10b for a time sufficient to force relay 10B to reestablish itself. Consequently, the relays 10A and 9S are reestablished following the elimination of the mass of their active paths via the contacts of the relay 10B.

   Relay 9S disconnects the ground of line 0 to restore the group selector matrix.



   COMMUNICATION PASSED FROM THE INSTALLATION OF SYSTEMATIC TESTS. ;
The systematic test facility test call is made in a similar fashion to the test and measurement table test call. The systematic test installation 930 initially has access to a group of 100 lines by pulsing three ohms via the + OC and -00 lines to relay 5A of connector 520 of the systematic test installation.

   From this moment, the oonotor 520 of the systematic test installation and the recording oonotor operate from it. Same way as those for a test call of the test and measurements table as described previously in order to establish a connection to a particular group of 100 lines.



   Then the test circuits 510 of the systematic test plant 930 can verify a line.

 <Desc / Clms Page number 25>

 given via the + T and -T lines, which line constitutes a direct metallic path to the called line. As soon as a test is carried out, relay 511 is put into action to eliminate the earth from the EC line, which forces relay 7AL2 to operate in series with relay 9S, in consideration of the fact that relay 7SPC is activated for a systematic call (special call) and that the relay 7OFC is not activated * Consequently, the incoming connector remains in demand.



   However, the connection to the line called from the incoming contactor is released, because relay 7AL2 is functioning and eliminates the ground of line C in order to thus remove the connection. It should also be noted that the connection of the connector of the systematic test installation 520 to the incoming connector remains intact due to the fact that the earth is connected, via the breaking contacts of the 7AN relay and the working contacts of the 9S relay (the 9S relay is activated), to the CO line, which keeps the crossing points of the group selector active.



   Then, the installation of systematic tests
930 forces the switching instructions to be transmitted via the two-phase on the + T and-T lines to the marker 200 of the line group via the incoming connector at the transmit-receive circuit 1000. This function is performed by the ground connec - Tied to the 5MM motor magnet, via the contacts of relay 511 of the systematic test installation 930, which forces the rotary switch 513 to switch to the next position. In this way, another series of switching instructions for another line of the group of 100 lines, stored in memory 516, can be transmitted via the two-phase transmitter 515.



   These transmitter instructions are used in the marker.



   200 of the group of lines in order to establish a connection to the next line of the group of 100 lines. Then relay 511 is

 <Desc / Clms Page number 26>

 restore and reconnect the ground to the EC line in order to maintain; the connection for the next row in the group. toroid of a release, the relay in the test circuits 510 of the systematic test installation 930 causes% a negative potential to be connected by a resistance to the line EC, thus indicating the triggering of the systematic testing facility 930.
 EMI26.1
 



  . '% ,,, Although the principles of the present invention have been described in connection with a specific apparatus, it should be clearly understood that this description is made solely, by way of example and not as a limitation on the scope of the Invention.



  'M, -,; N17IG.



  1.- Telephone switching system, character- ized in that it comprises p.'aieura telephone routes, a switching network for selectively interconnecting said routes, a control unit for selectively controlling said network in order to establish a first connection between one of said calling paths and one of said called paths, and a test and measurement unit responsive to a test signal coming from one of said paths connected to constrain said control unit has established a second connection via said network of said called route, in order to thus carry out an internal equipment test for said called parcels.

 

Claims (1)

2. - Telephone switching system according to claim 1, characterized in that it comprises a trigger member sensitive to the establishment of said second connection to release said second connection, and in that said test and measurement unit is furthermore responsive to a subsequent test signal from one of said connected paths to force said common control member to state. <Desc / Clms Page number 27> making a third connection through said network of said called route, thereby repeating said internal test of the equipment for said called route. 3.- Telephone switching system according to claim 2, characterized in that several telephone paths comprise a test and measurement connector member for generating said test signal and in that one of said calling routes is the connecting organ of tests and measurements. 4. - Telephone switching system, characterized in that it comprises several telephone routes, a switching network for selectively interconnecting said routes, several monitoring units to control the connected routes, a common control unit for selectively controlling said routes. network with a view to establishing a first link between one of said calling routes and one of said units and also with a view to establishing a second connection between said unit and one of said called routes, and a test and measurement unit responsive to a test signal from one of said connected paths to force said common control unit to establish a third connection through said network of said called path in order to thereby perform an es- internal sai of the equipment for said called route. 5. - Telephone switching system according to claim 4, characterized in that it comprises a further line circuits individually connected to each of said telephone paths to couple said paths to said switching network, each of said switching circuits. line comprising a line relay to activate said common control unit in response to a route initiating a call and a cut-off relay to disconnect the line relay from the paroq% ire in response to the route designated as a route called by the* <Desc / Clms Page number 28> known as the common control body, in that said monitor comprises an identification member responsive to the establishment of said first connection for preparing the monitoring unit for receipt of said test signal from the said test signal. test and measurement unit, and in that this system further comprises a shunt circuit coupled to each of said cut-off relays and a tripping member coupled to said first connection via the identification member sensitive to said signal d 'testing of said test and measurement unit via said first connection with a view to coupling said shunt circuit to the cut-off relay of said called path, so that said cut-off relay is reestablished in order to switch off the line relay at the called route. 6. - Telephone switching system according to claim 5, characterized in that said identification member is a service relay, in that said trigger member is a trigger relay coupled to said first connection via the contacts of the service relay and in that said shunt relay comprises a verification relay active in response to said third connection to thus designate a trigger state for said common control unit and to release said connection. EMI28.1 7.- Telephone switching system hear- ing claim 5, in that it comprises in or a non-meshed relay network sensitive to said ooni member: 81st common to connect said shunt circuit to relay 1 (gne said path called. 8. A telephone switching system according to claim 6, characterized in that said telephone paths comprise a test unit and suitable for generating said test signal and in that one i- called calling routes is an ei e test connector unit <Desc / Clms Page number 29> measured. 9. A telephone switching system according to claim 8, characterized in that said test and measurement connector member comprises a signaling relay having a first deferred time interval to generate said test signal, and in that that said testing and measuring device comprises a time relay having a second deferred time interval in order to maintain said trip relay active for the duration of said second deferred time interval, so that said relay trigger operates at the end portion of said first deferred interval and before the end portion of said second deferred interval to thereby distinguish said test signal from a trigger designation for said common control member, 10. A telephone switching system according to claim 4, characterized in that it comprises a trigger member sensitive to the establishment of said third connection to release said third connection, and in that said test and measurement member is further responsive to a subsequent test signal from one of said connected paths, to compel said common control unit to establish a fourth connection through said network of said called path in order to thereby repeat said internal test of the equipment for said called route. 11.- Telephone switching system, characterized in that it comprises several telephone routes, a switching network for selectively interconnecting said routes, several monitoring units to control the connected routes, a control unit for establishing selo - tively a first connection between one of said calling paths and one of said units and to selectively control! <Desc / Clms Page number 30> said network results in establishing a second connection through said network between said unit and one of said called paths, and a device responsive to a test signal from one of said connected path to force said control unit to release only said second connection. 12. A telephone switching system according to claim 11, characterized in that said several telephone routes comprise a systematic test unit and in that one of said calling routes is the systematic test unit. 13. A telephone switching system according to claim 12, characterized in that it comprises an identification member sensitive to the establishment of said first connection from said systematic test member to said monitoring unit with a view to preparing the monitoring unit for receiving said test signal from said systematic test unit, and in that said monitoring unit includes a trigger unit coupled to said first connection by the sensitive identification unit said test signal from said systematic test unit via said first connection to release said second connection and maintain said first connection. 14. A telephone switching system according to claim 13, characterized in that said identification device is a service relay and in that said trigger device is a trigger relay coupled to said first connection via the contacts of the device. service relay. 15. - Telephone switching system according to claim 11, characterized in that said control member establishes said first connection by said network. 16. - Telephone commutation system, characterized in that it comprises several commutation stages <Desc / Clms Page number 31> for extending connections between calling and called lines, each stage having a plurality of cross-point matrix groups including members for extending connections by these groups in the direction of the desired called line and for extending a connection from the line. systematic test unit up to the called lines in order to verify a group of called lines, an active marker unit to extend a connection through each stage successively, a transmitter unit, a unit to connect said emitter unit to the connections extending to one of said floors, a member in said transmitter unit for transmitting signals encoded by the connections to the marker unit associated with said switching stage, a subscriber arrival junction unit, a unit in the marker unit for said active stage, responsive to the reception of said coded signals to adjust the matrices of said stage with a view to extending the connection to said subscriber arrival junction member, a member in the emitting member for the transmission of signals coded indicating the nature of the call by the connection thus established to the terminating subscriber junction unit with a view to enabling the latter to be used when establishing an terminating connection for] 'call, an identification unit sensitive to the establishment of a connection to the incoming subscriber connection unit in order to prepare the incoming subscriber connection unit for the reception of a signal from triggering coming from the systematic test organ, and a triggering device of a subscriber arrival junction bar coupled to said connection established at the subscriber arrival junction device, responsive to said trigger signal from the systematic test unit to release the incoming connection of said incoming subscriber junction unit to the called line and to maintain the calling line connection to the called line. abon arrival jonotion organ <Desc / Clms Page number 32> -ne in order to thus urge the marker member associated with the subsequent switching stages in order to receive the coded signals indicating the location of the equipment of another line called of said group from the member in said transmitter member until - to the last-mentioned marker organ, so that a further arrival is completed at said other called line of said group upon elimination of said unwinding signal. 17. A telephone switching system according to claim 16, characterized in that said identification member is a service relay and in that said trip member is a trip relay coupled to said first connection via the contacts of the device. servioe relay. 18. - Telephone switching system, characterized in that it comprises several switching stages for extending a set of telephone conductors between the calling and called lines and for coupling a first polarity pole of a current source continuous, by a first inductor of relatively high impedance, to a first conductor of said set and a second blade of polarity of said source, through a second inductor of relatively high impedance, to a second conductor of said set to thereby supply current to said set set of conductors a monitoring unit and a first coupling member for selectively coupling the monitoring unit to a row of busy telephone conductors with a view to designating a change from the ooouped state to the free state of said conductors, the monitoring unit comprising a deflection relay, loop, and a member ooupling the relay to electrically couple said relay in parallel with the set of busy telephone conductors and to couple a shunt circuit parallel to said second inductor in order to reduce the impedance of the active circuit to the relay, so that said relay operates and <Desc / Clms Page number 33> thus passes to the occupied state in response to the current flow of said active circuit taking said first inductor and the winding of said amdit circuit relay ahunt, without substantially affecting the current supplied to said set of occupying telephone conductors, said unit coupling the relay being designed to remove said shunt circuit from said second inductor after said relay has been actuated, so that said relay remains active in parallel with said set of busy telephone conductors by an active circuit to relatively higher impedance in order to thus remain active until said set of busy conductors changes from a busy state to a free state. 19. A telephone switching system, combined according to claim 18, characterized in that said member 'coupling the relay comprises a line busy relay to operate in response to the busy state of the telephone conductors, thus coupling said loop deflection relay to said busy telephone conductors, and a control relay for coupling said shunt circuit, via the contacts of the control relay, in parallel to said second inductor and for reestablishing after said loop deflection relay was put into action. 20.- Telephone switching system, combined according to claim 19, characterized in that it comprises a series circuit comprising a resistor and a capacitor connected in parallel to said contacts of the control relay to substantially suppress the electrical interference with the busy telephone conductors when the control relay is restored. 21. - A combined telephone switching system according to claim 18, characterized in that said member coupling the relay comprises a diode bridge circuit coupled from the busy telephone conductors to the relay. <Desc / Clms Page number 34> loop deflection so that the latter operates regardless of the relative polarity of the set of telephone conductors. 22. A telephone switching system, combined according to claim 18, characterized in that said member coupling the relay further comprises a holding relay to operate in response to the request of the monitoring unit, thereby opening the relay. active circuit to the loop deflection relay via the holding relay contacts in response to the monitoring unit returning to a free state. 23 .-. Combined telephone switching system EMI34.1 @@@ before claim 22, characterized in that it comprises a @@@@ in series comprising a resistor and a capacitor 'oorm, eot: "-n¯parallel to said c. \' tacts of the holding relay in view from auppr ... in substance the int.; electrically renewed with the tele conductors ;; iiguea of oooup \ tiol when the maintenance relay is reestablished, 24.- EU c-: tmmu system, combined telephone according to claim 18, oaraotét; qé in that said first and said second relatively high impedance inductors are battery power relay windings.