FR2466161A1 - TELEPHONE INTERCOMMUNICATION DEVICE - Google Patents

Abstract

THE INVENTION RELATES TO A TELEPHONE INTERCOMMUNICATION DEVICE. THE DEVICE INCLUDES TELEPHONE DEVICES EACH ASSOCIATED WITH AN AUXILIARY UNIT INCLUDING SELECTION BUTTONS INTENDED TO CALL THE OTHER DEVICES IN THE INSTALLATION AND A KEY TO TAKE A LINE ON THE NETWORK. THE OPERATION OF A SELECTION BUTTON COMMANDS A PULSE TRANSMITTER WHICH EMITS, ON A SIGNALING CIRCUIT, PULSES WHICH SPECIFY THE NUMBER OF THE CALLED DEVICE. THE INVENTION APPLIES IN PARTICULAR TO INTERCOMMUNICATION FACILITIES WITH A NETWORK LINE AND FIVE ADDITIONAL STATIONS.

Description

246616? 1

  The present invention relates to a telephone device

  type sometimes referred to as star assembly. A disc

  Such a positive one, intended for private use by a number of additional posts and private posts, for example five posts, is intended to handle inter-exchange traffic between posts by a common line of intercommunication and the external traffic may be treated by a line to the public network cormmune posts, each of

  the latter being connected to a common processing unit

  intended to control and fulfill the functions of

  mutation and signaling necessary to treat the

  external traffic and domestic traffic.

  A telephone device of this type is described in the Dutch patent application N 74 04995 filed

October 14, 1975.

  In this telephone device, the improvement made on the previous devices in this area is

  every telephone in the installation is

  connected to the central processing unit by a cable with only four wires. A two-wire circuit constitutes the conversation circuit and the call signal transmission circuit and the selection data on the line

  to the network and the other two-wire circuit

  signaling functions.

  In this prior device, each telephone device

  sound has a single selection key for

  call signaling. A telephone connection

  the intercom line can therefore be se-

  selected by pressing the selection key

  number of times which corresponds to the telephone number of the

ordered in 1 installation.

  An object of the invention is therefore to improve the com-

  moderation of exploitation and use of an installation of this kind, while retaining the technical advantages

inherent in them.

  Another object of the invention is to provide a

  almost complete control by electronic devices

  with the possibility of applying the technique

  CMOS components (metal-oxide-semiconductor-complements

2466161 l

  using the standard components.

  For this purpose, the telephone device according to the

  vention is characterized in that each of the

  telephone systems forming part of the installation comprises for each device of the installation to be selected, a

  separate selection key assigned to this tele-

  respective phonics; the selection keys are included in a control circuit which, in response to a single

  a selection key, produces an electrical signal

  selection which uniquely defines the identity of a requested telephone set of the installation, each

  telephone apparatus further comprises a transmitter of im-

  electric drives arranged in such a way as to:

  response to the electrical selection signal a series of

  selection fields indicating the identity of the tele-

  phonic requested in the installation; and b) producing an initial pulse of a predetermined duration and preceding each selection pulse sequence; a device is further provided for opening and closing a signaling circuit connected to the central processing unit,

  the control of the pulses produced by the transmitter of im-

  urges. In order to allow the telephone device

  of the installation according to the invention is carried out using

  standard components, another feature

  according to the invention lies in the fact that the transmitter of im-

  pulses comprises a source of clock pulses which produces clock pulses each having a duration

  determining the duration of the selection pulses, a

  main controller adjustable by the selection signal and which, in response to a selection signal at its input, performs a number of counting operations corresponding to the value of the applied selection signal, increased by one, and an auxiliary counter. who, in response to

  clock pulses from said source of im-

  clock pulses, and also to an output signal of the main counter, controls the counting operation of this main counter so that, via

  a door circuit that combines the pulses of hor-

2466161]

  and the output signals of the main counter and the auxiliary counter, regardless of the period of operation of a respective selection key, at least

  a complete pulse sequence comprising the pulse

  initial pulse and several selection pulses indicating the requested telephone apparatus, followed by an incomplete sequence of pulses including an initial pulse and a selection pulse, are transmitted.

  to the central processing unit.

  In order to meet the wish that a device

  telephone according to the invention can be used in

  pairing with telephones, whatever

  their type, and without modifying them, and according to another

  feature of the invention, each telephone

  the installation consists of a telephone

  than normal type comprising a conversation circuit and a separate auxiliary unit comprising the selection keys, a line selection key to the network, a signal lamp, the control circuit and the electric pulse transmitter, and wherein via an optical coupler circuit

  it includes, the variations of current in the cir-

  Cooked conversation of the telephone device, by

  example resulting from on-hooking and stalling,

  to be detected so that, depending on these variations,

  current, the auxiliary unit is coupled or not with the central processing unit by a circuit of

two-wire signaling.

  In order to further improve the convenience of use of the telephone system, according to a

  other aspect of the invention, provision is made for a

  to indicate an incoming call signal via the line

  bucket to all ancillary stations connected to the

  by means of an optical signal characteristic of the

  pel entering the line to the network.

  For this purpose, and according to yet another feature of the invention, the telephone device and,

  more particularly the central processing unit, as

  carry an additional signal generator that responds to an incoming call signal from the public network

  applied to the signal generator produces an optimum signal

  that indicating the occupation of the line to the network, this sign

  nal being modulated by the additional generator at a frequency characteristic of the input of a call signal

on the line to the network.

  Other features and advantages of the invention

  will be better understood by reading the description

  following an example of implementation and referring to

  in the accompanying drawings, in which: FIG. 1 is a diagrainve general of a mode of

  realization of a telephone device according to the invention

  2 is a detailed diagram of a telephone apparatus forming part of the device of FIG. 1, FIG. 3 represents a first group of forms.

  waveforms illustrating the operation of a transmitter of im-

  impulses forming part of a telephone device during

  a selection key is operated continuously

  naked, Figure 4 represents a second group of forms

  waveforms illustrating the operation of this transmitter of im-

  pulses when the same selector key is operated for a relatively long period, Figure 5 shows a third group of waveforms illustrating the operation of the generator

  pulses when another selection key is

noeuvrée,

  Figure 6 is a more detailed diagram of a cir-

  the coupling circuit being part of the central processing unit, this coupling circuit being provided separately for each telephone apparatus of the installation, FIG. 7 is a diagram of a network line control circuit forming part of the central processing unit. central processing unit,

  FIG. 8 is a diagram of a selection register

  part of the Central Processing Unit,

  FIG. 9 is a group of illustrated waveforms

  the operation of the selection register of the 2466161 in Figure 8, and Figure 10 is a diagram of a basic unit

  part of the central processing unit.

  In the embodiment of a remote installation

  according to the invention, represented in FIG. 1, five telephone sets TKN1 to TKN5 are each connected by a cable having only four wires, at a

  central processing unit which is common to all

  phone calls and who. is shown in the figure

  to the right of the mixed line. This processing unit

  carries a common trunk line NBK circuit All telephone sets, an IRR selection register common to all telephones, a basic BED unit common to all telephones and several device coupling circuits TKG1 - TKG5 , a

  for each telephone device separate from the install.tion.

  The corresponding terminals of the telephones

  and coupling circuits are designated on the

  Figure 1 shows two digits separated by a dot, the first digit indicating the respective terminal and the second digit after the dot indicating the serial number of the circuit in which the terminal is located. Figure 1 also shows how the terminals to the right of the device coupling circuits are connected to the other components of

the processing unit.

  Each telephone is connected by a cir-

  two-wire signaling furnace for example the circuit 1.2 - 2.1 to the associated device coupling circuit in the central processing unit via the terminals, for example c.1-d.1, of the device coupling circuit TKG1 . This signaling circuit is used for the exchange of signals between the respective telephone apparatus and the central processing unit, particularly the selection data for the signaling of incoming calls, the signals intended for network traffic with associated optical signals. for example the signals of occupation to the network,

  line guard signals and signaling signals

  network line tent, as well as the signals associated with the reminder, the transfer ot the earth function. In addition,

2466161]

  each telephone is connected by a circuit

  two-wire conversation, for example circuit 6.1 -

  4.1 to the associated device coupling circuit, for example

  connect the TKG1 circuit via terminals B321.1 - B320.1. In fact, during nonrental operation, the network voltage relay K 501 is energized so that the terminals

  k501 and 1c'501 are connected to these terminals B21.1 and B20.1.

  The purpose of the conversation circuit is to exchange the conversation information between the respective telephone unit and the central processing unit, and furthermore, this circuit fulfills the function of transferring the data of

  selection which are transmitted by the lines to the network and

  if that audible signals for internal selection,

  for example from the corresponding apparatus. The

  FIG. 1 further shows that all device coupling circuits are connected directly via terminals B16 and B18 to the public network line terminating at the terminals.

Na - Nb.

  If, in this telephone system, the handset

  of a device is off the hook, this unit is connected

  directly to the common line provided for the flow of the

  internal traffic (intercom line).

  When an internal connection has to be established between a telephone device of the installation, for example the TKEN1 apparatus, and another apparatus of the installation, for example TKG5, the number of the requested apparatus, in this case 5 , can be selected as requested number

  by pressing the corresponding selection key

  view for number 5 to call. Pulse selection

  transmitted in the requesting apparatus, by the maneuver

  the selection key, these selection pulses indi-

  as for the requested device, are transferred by the circuit

  signaling system (1.1 - 2.1) to the Central Processing Unit.

  and these impulses enter the unit through

  terminals c.1 - d.1. Through the coupling circuit

  TKG1, which performs the function of an integrated circuit

  intermediate (interface) between the appar apparoi. t

  and the other constituents of the central processing unit that are common to

2466161]

  of the installation, the selection pulses are trans-

  from terminal B1.1 to the respective entry D10 of the regis-

  selection gate KRR, this selection register producing an excitation signal at its output D1 allocated to the telephone set N 5, via the terminal B3.5 of the coupling circuits TKG5 associated with this apparatus; under the effect of this excitation signal, the conversation circuit (a.5 b.5) leading to the telephone set N 5 is connected to a call signal circuit (B9.5-B8.5) connected itself to a call signal generator (AC voltage to

  Volts) forming part of the basic BED unit; this genera-

  the function of which is to produce call signals

  inner diols. As a result, the telephone apparatus

  that requested receives the call in the form of a signal of

  buzzer characteristic of an internal call and which differs

  is clearly an appe.i signal. proctuit under the effect of a

  incoming call from the line to the line. The internal connection

  between the two telephones, in the case

  devices 1 and 5, is established by the

  age of the handset of the device requested. This internal connection

  is not secret. If another station of the

  answer, it is connected directly to a cormmunica-

  established, without hearing a signal.

  Given the non-secret nature of this

  conversation, an internal conference may be held by calling the other respective apparatus

of the installation.

  An outside call entering the network from the Na-Nb terminals is announced in the installation by one or more rings that can be optionally mounted.

  in a central place. or on one or more tele-

  phonic. In a telephone device according to the invention

  this incoming call through the line to the network may in

  besides being announced by an optical signal produced

  phone rates, the flicker frequency of this

  optical signal being characteristic of an outside call.

  Each telephone device can answer the ex-

  by using the provided trunk key on each station. When the line to the network is occupied, 24661 61 is indicated to all telephone devices by an optical signal, in particular by the continuous ignition of

  the respective signal lamp.

  While a particular telephone is answering an outside call, all other devices are blocked for outside traffic. The same indications and blockages

  apply to an outgoing connection on the line to the

s water.

  If the telephone system is connected to a central unit performing the functions of earth button, the

  touching the network of a telephone device

  tif can also function as a landkey after

taking the network line.

  When a telephone device of the installation has been connected to the line to the network, this device pelut be

  connected to other devices of the installation in maneuver

  on the respective device the selection key

  with the device - call in duplicate. He is

  that the respective telephone is automatically connected to the intercom

  that the line to the network is placed on guard. Other applications

  telephone operators in the installation are informed of this situation by an intermittent light signal whose flicker frequency is characteristic of this

  condition of keeping a line to the network. At the end of

  call, the line key on the network of the tele-

  respective voice can be manipulated to connect

  again this device to the line to the network and for

  resume the conversation established on this line. Doubling

  call can be done both in the case of

  incoming only outgoing traffic on the line to the network.

  It is also possible to transfer a communica-

  between the line to the network and a tele-

  sound of the installation to another device of the in-

  stalling. For this purpose, the same operations as those required for the double call are made on the

  telephone set initially connected to the line

  bucket. When it is busy, the extension to which the connection is to be transferred answers the call by pressing its

24661616]

  line key to the network. The execution of the transfer of

  external communication is announced on the device

  killing the transfer by the continuous ignition of the lamp of

  signaling. I.e handset of the telephone

  killing the transfer can then be hung up. Transfer is possible both in the case of an incoming call

an outgoing call to the network.

  The telephone installation also includes a

  K51 tension control lais part of the unit

  basic BED. In the presence of the voltage of the power supply

  of the installation, this relay is energized so that the associated contacts] 51-k'51 directly connect the conversation circuit of the telephone apparatus TKN1 to

  the central processing unit, at terminals B21.1-B20.1.

  In the event of a power supply voltage failure, this

  lais is césexc: it. and these contacts go into the rest position, which results that the telephone set N 1 is connected directly to the line to the network. In that case,

  all incoming calls appear on this tele-

  phonic and traffic on the line to the network is also possible. The optical signaling of occupation of the line to the network is carried out by a signal generator forming part of the basic unit BED, this generator producing a

  signal with a frequency of 18 dHz and its output being connected

  terminals B7.1 - B7.5 of coupling circuits TKG1 -

  TIG5 telephone sets. The entrance terminal of

  R501 latching of this signal generator is connected

  at terminal C23 of the NBK line control circuit to the

  3o bucket by which this generator, in the case of the taking of

  line to the network, can be triggered by all

  telephone lines of the installation, in particular from terminals B4.1 - Bi4.5, through inputs 013, Cll, C8, 02 and C5 of the NBK line control circuit

  to the network. The line control circuit to the network

  further carries a second and a third signal generator. The signals produced by these generators modulate the signal produced by the first generator in response to the establishment of a guard situation or entry

24661 61

  from a call on the line to the network. In the case of passage

  on hold, a K502 guard relay is energized which it

  that the line to the network is looped by the relay contact k502, by a resistor R1550, while at the same time, the guard state is applied by the circuit of division.

  device range associated with the device considered on the

  the guard state is created by the respective terminal B6.1 to B6.5 to the corresponding terminal C15, C12, C9, C6 or C3 of the line control circuit to the network; it follows that

  plus an excitation signal of the guard relay c502, a signal

  nal. is generated for the second signal generator which modulates the signal of the first generator with a signal characteristic of the guard state. Similarly, in the case of an incoming call on the line to the network (terminals C21 - C26 of the line control circuit to the network), the third signal generator can be cut with the first generator so that last is modulated by a signal characteristic of the incoming call by the line to the network. The K301 earth relay forming part of the NUK network line control circuit can be energized from each of the telephone sets

  of the installation through the circuit of

  associated range, namely from terminals B2 / 5.1 -

  B2 / 5.5 and corresponding terminal C14, C10, C7, C1, C4

  from the line control circuit to the network.

  The selection register lRR has five separate inputs, particularly the terminals D10, D8, D6, D4 and D2 which are respectively connected to the associated one of the

  coupling circuits, in particular to

* Nes B1.1, B1.2, B1.3, B1.4 and B1.5. The outputs respectively

  of the selection register KR}, particularly the

  D9, D7, D5, D3 and D1 are connected to the respective inputs

  of the corresponding device coupling circuits

  particularly in B3.1, B3.2, B3.3, B3.4

and B3.5.

  After this general description of the installation

  telephone, the separate elements of this installation

  will now be described in more detail.

  Figure 2 is a detailed diagram of one of the

2466161]

  telephone kidneys TCN1 - TKN5. This telephone has two separate circuits, namely a circuit for

  transfer of the conversation signals and acoustic calls

  ticks (inside) and ending at terminals 6.1 - 4.1; and a circuit for transferring control signals and signaling signals and terminating at terminals 1.1 and 2.1. The conversation transfer circuit is of a standard type and comprises a generator H101, generators

  acoustic calls connected by a contact K109 of cro-

  chet switch controlled by the handset, at the terminals of the

  two-wire circuit connected to the central processing unit

  is lying. If the telephone has a dial of

  election, the anti-surge circuit including the conden-

  C107 and the resistor R108 is fixedly connected across the dial-controlled pulse contact K108 so that the second switch hook contact K107 operated by the handset is available for a function in the other serving circuit. to the signals of

  control and signaling signals, this circuit

  at terminals 1.1 and 2.1. If instead of a selection dial, the telephone device has a keypad

  keys producing multi-selection

  frequencies, this anti-surge circuit is absent. The cap

  selection dran and keypad are used

  to issue selection data on the line to the

  bucket. To display an internal communication,

  The telephone network further includes a number of selection keys whose number is equal to the number of devices that can be connected to it. In the present

  embodiment, the maximum number is five. The tourists

  selection criteria K102, K103, K104, I105 and K106 are

  of a control circuit comprising three conductors

  ending at inputs 4, 12 and 13 of a counter-

  adjustable down-counter D101 which will be described later. The ap-

  such telephone further comprises a K101 line key to the network and an optical signaling device

  in the form of a light emitting diode B101.

  Different signaling signals can be emitted

  by a telephone on the signaling circuit.

24661 611]

  from terminals 1.1 - 2.1 to the central processing unit. The set-up and idle signals corresponding to the stall condition and the handset hang-up condition appear as a voltage drop across the terminals and an interruption of the signal wires terminating. at the terminals 1.2

and 2.1.

  By the operation of the line key K101 to the network and earth button, the wires of the signaling circuits

  are short-circuited, resulting in the fall of

  voltage across the power supply of the device (between V102 and V105) is canceled; in other words, the signaling wires 1.1 and 2.1 are short-circuited producing

  a voltage increase to the central processing unit

  indicating the maneuver of the line

bucket.

  By operating a selection key K102 -

  1106, the pulse transmitter included in the device

  telephone, and which includes the up-down counter

  D101 above, is controlled by the control circuit so that the signaling circuit connected to the central processing unit, as long as the respective selection key is operated, transfers

  cyclically pulse sequences indicating the

  phone call called in the installation, in the form

  line breaks to the Central Processing Unit.

  in which the impulses are interpreted and counted. The different signals used for signaling

  of the respective telephone, in particular

  connect the line busy signals to the network, the line hold signals to the network and the external call signals on the line to the network, are transferred as a sinusoidal voltage of 18 kHz, a 18 kHz sinusoidal voltage modulated at 1 Hz and an 18 kHz sine wave voltage, modulated at 4 Hz, from the central processing unit by the two signal wires and passing through the

  1.1 and 2.1 to the telephone, in which

2466161!

  these signals can be reproduced by the

  V101 optical signaling, consisting of an electronic diode

  luminescent, passing through the capacitor C105, and the inductor P103 and the capacitor C111 constituting a resonant circuit. The selection keys E102 to K106 are furthermore arranged so that, in response to the operation of one of these keys, the optical signaling device B101

  short circuit, which prevents reproduction by this last

  deny selection pulses emitted on the circuit of

signaling 1.1 - 2.1.

  the electronic section of the telephone receives the power supply via the zener diode V105, the diode V104 and a buffer capacitor C104. The transistor

  V102 is controlled by the pulses produced by the transmitter

  driver and interrupts the signaling circuit.

  tion at terminals 1.1 and 2.1 at the rate of impulses applied to it. The stop coil T101 connected in series with this transistor prevents the signals

  the optical signaling device B101 does not

  perform the operation of the pulse transmitter and

his diet.

  Each telephony apparatus of the

  carries an individual pulse transmitter consisting of integrated circuits D101, D102, D103. The integrated circuit D101 is an adjustable counter, in binary code, known step. This counter can count in binary code or in decades depending on the voltage level applied to the input terminal 9. If a "1" is applied to it, the counter

  count in binary code. In a similar way, the

  it progresses in response to the application of a "1" at terminal 10, and vice versa. When a "1" is applied to the input terminal 1, the counter can pass freely, through the inputs terminating at the terminals 4, 12, 13 and 3, to a given value and without synchronism with clock signals which are also applied to terminal 15. In addition, the meter is arranged so that it can be

  not in response to a positive transition of the hor-

  applied to Terminal 15, if a "0" has been applied to

2466161]

  inputs corresponding to terminals 5 and 1. The counting progress is forbidden if a "1" is applied to one or the other of these two terminals. Terminal 2 is an output through which an output pulse is generated for each pair of counted clock pulses.

  Each of the integrated circuits D102a and DO102b is one-

  binary up-down counter of known type. Each of the two counters D102a and D102b, identical to each other, is a four-step counter. The count steps are arranged

  as switchable rocker circuits arranged

  to step one step in response to a positive transition of a clock pulse applied to a clock input 1.9 of the respective counter, or a transition

  negative of a release pulse applied to the

  the appropriate counter 2.10. Each account

  can be brought to rest asynchronously by a high level signal at the respective input 7.15.

  at rest. As a result, the meter is advancing

  in response to the simultaneous presence of a positive transition of a pulse of the clock signal, a "1" of the

  release signal and a "0" of the reset signal.

  pos; of a "0" of the clock signal, a negative transition

  release signal and a "0" of the idle signal. Terminals 3 and 4 are outputs Q1 and Q2 of a

  counter and terminal 12 is the Q2 output of the other

tor.

  In addition, the pulse transmitter has a gen-

  clock impulse with NOLg OR doors

D103a and D103b.

  The control circuit in which the selection keys K102-K106 are connected is arranged so that in response to the operation of one of these selection keys, a voltage profile is produced at the three output leads e ce: ci., (Uit of order, which are

  connected to terminals 4, 12 and 13 of counter D101, this

  voltage wire being characteristic of the identity of the requested telephone set indicated by the operation of the respective selection key. For example, the

2466161]

  Operation of the K106 selection key produces a ± + voltage profile on the three output leads, this voltage profile representing the number five, in other words, the telephone receiver with the number cilnq. The counter D101 can be set up by this control circuit of

  in response to the application of a release signal

  terminal 1, this counter shall be set to the value indicated

  by the control circuit, irrespective of the impulses

  clock pulses applied to the input terminal 15.

  The counters above, the clock pulse generator connected to. the entry 'd. release 2 of the meter

  D102a and the two gates NO OR D103c and D103d are inter-

  connected so that each pulse cycle pro-

  picks by the pulse emitter starts each time

  by a fixed pulse of 40 milliseconds, this impulse

  sion being recognized in the central processing unit as a pulse of resting meters

  part of. selection register. After this initial impulse

  a number of selection pulses each

  duration of 2.5 milliseconds determined by the

  clock signals are issued. The number of impulses

  selection issued in a cycle is equal to the number of the

  the same phone selected, plus one unit. When the respective selection key is released, the cycle

  current impetus is determined or an imilpUs ion iilt: ia-

  the with a pulse of 3.ection are issued, following the

  moment nThe respective selection key was released.

  But this last combination of pulses are not re-

  known in the central processing unit. The connection between the output Q2 (terminal 4) of the counter D102a and the input (terminal 3) of the counter D101 avoids the progress effect at the connection of the supply voltage. The operation of the above ticrit pulse transmitter is illustrated in detail in FIGS. 3, 4 and 5. FIG. 3 illustrates the case where the selection key K106 (to select station number five) is operated during a period of time. relatively short period (line 31). Line 32 represents the signal developed at the output Q1 (terminal 11) of the counter D102b in response to the operation of this key. Line

2466161 J

  33 shows the clock pulses produced by the clock pulse generator at the terminal 3 of the NOR gate D103a in response to the operation of the selected selection key. The line 34 represents the signal developed at the output Q4 (terminal 2) of the counter D101.

  say that line 35 represents the liberation impulses

  generated by the counter D102a at the terminal 3, these release pulses being applied to the release input (terminal 1) of the counter D101. As a result, a signal represented by line 36 is produced at

  terminal 4 of the counter D102a, which results in a

  gnaJ represented by line 37, produced at the exit of the gate NO OR D103d; this signal is applied to the input 9 of the NOR gate D103c. The control signal of the

  transistor V101 finally produced by the transmitter of im-

  impulses is represented by line 38 which shows that

  the operation of the selection key corresponding to

  at position number five, a pulse cycle is

  product consisting of an initial pulse of 40 milli-

  seconds followed by six selection pulses; it appears

  also that after the release of the

  respective selection, a single selection pulse is

still issued.

  In general, after releasing a touch of

  "Pulse transmitter completes the trigger cycle.

  by the maneuver of the key. Regardless of the

  o the respective selection key is released,

  at least one complete cycle of pulses (a group of impulse

  selection stations indicating the requested position and an

  idle pulse) and a selection pulse with a quiescent pulse is produced. But the

  combination of the last two impulses is not re-

  known by the selection register. When a selection key is released, the internal call signaling stops. In other words, the call signal produced at the called station ceases and is therefore represented only by a signal (non-intermittent) as long as the selection key

respective is maneuvered.

2466161]

  FIG. 4 illustrates the case in which the selection key of the telephone set 5 is operated during a

  relatively long period (line 41), in which case two

  successive events ie six selection pulses each are produced (line 48). Lines 41, 42, 43, 44, 45 and 48 of FIG. 4 correspond to the lines

  31, 32, 33, 34, 35 and 38 of Figure 3.

  Figure 5 illustrates the case in which the selection key K102 of the number one telephone apparatus is operated. The lines 51, 52, 54, 55 and 58 of FIG. 5 correspond respectively to the lines 31, 32, 34 and 35.

38 of Figure 3.

  When the handset of the telephone is off the hook, the

  switch contact K107 is closed and, at this point,

  pulses produced by the pulse transmitter are transferred to the central processing unit in the form of interruptions of the passing signaling circuit.

at terminals 1.1 and 2.1.

  In order to meet the wishes that a

  telephone service of this kind can be used in

  pairing with unmodified telephone devices

  whatever their construction, an auxiliary unit has been developed that can be used as a console

  for the telephone apparatus, this auxiliary unit

  holding the portion of the apparatus shown in Figure 2 which is connected to the signaling circuit (1.1-2.1). A

  telephone set used in combination with such

  the auxiliary unit can be connected to the unit without

  another adaptation is necessary. In this respect, and in

  because of the fact that the hook contact function

  mutator of the mechanical contact 'I107 of FIG.

  filled by an electronic device, the con-

  the respective telephone device is connected to

  electrically through a cable leading to the auxi-

  to a light-emitting diode included in the cir-

  cooked conversation; this light emitting diode is connected in series with a current limiting resistor to form a diagonal of a bridge circuit

2466161]

  four-armed straightener, the other diagonal being

  connected to the terminals of the conversation circuit of the

  telephone. This bridge rectifier is provided so that the cir-

  connected signaling is insensitive to changes in

  polarity in this circuit. A Zener diode is connected in parallel with the series circuit constituted by

  by the light-emitting diode and the resistance of

  current maiting so that the line current in the conversation circuit can vary between about 5 and 150 milliamps; this avoids the passage in the diode

  electroluminescent current more intense than the

  their maximum allowed. The light-emitting diode is

  optically coupled with a photo-transistor for

  Mute an in-line current as low as 4 milliamps.

  The current in the light-emitting diode is gold-

  3 milliamps. If the line power in the cir-

  100 milliamperes, in this arrangement,

  tif, the current flowing in the light emitting diode

  it increases only up to about 15 milliamperes,

  so that this circuit is universally applicable.

  saddle. The switch hook function of the mechanical contact

  K107 in Figure 2 is replaced in the unit above

  xiliary by a switching transistor coupled with the phototransistor. It results from the optical coupling between the light-emitting diode and the associated phototransistor

  when the handset of the telephone is de-

  hooked and hooked up, the switching transistor respectively connects and disconnects the signaling wire leading to the terminal 2.1 of FIG. 2 with respect to the common point 3o between the arresting coil T101 of FIG. 2 and the connection with the line key network 101 of FIG. 2. The circuit of the selection pulses for the

  internal signaling and optical signaling

  bucket described with reference to Figure 2 may be

  used in an unmodified form in this unit

  xiliaire. In addition, the blocking of the switching transistor

  coupled with the phototransistor is attenuated by a capacitor connected in the base-emitter circuit of this

2466161 1

  transistor so that in the case of using a

  dial telephone, interruptions in the speech circuit produced by the operation of this

  dial do not affect the correct operation of the cir-

  cooked optical-electrical coupling. In addition, thanks to a capacitor connected between the emitter and the collector, the switching transistor is short-circuited to the AC voltages resulting from the optical indication.

from the line to the network.

  Figure 6 is a more detailed diagram of one of the

  TKG1-TKG5 device coupling circuits of FIG.

  One separate from these device coupling circuits is

  provided for each telephone connected to the

  each coupling circuit forming an integral part of the

  intermediate circuit or interface between the one hand

  such telephone and, on the other hand, the other constituents of the Central Processing Unit. If less

  the maximum number of telephone sets are connected

  installation circuits, device coupling circuits in the form of modules can be removed for devices that are not connected

  correct operation of the other elements and without

  another adaptation of the installation is necessary.

  An interoffice telephone coupling circuit

  comes in the following functions: the line function to the public network; transfer of selection pulses for internal signaling; control of the guard relay in conjunction with the guard state of the line to the network; the recognition of a circuit interruption caused by the contact of the switch hook of a handset the control of the earth relay together with the earth line functions; controlling an excitation circuit for the internal call signals; and signal transfer for optical signaling in

a telephone device.

  The device coupling circuit shown in the

  Figure 6 is assumed to be associated with the tele-

  TKN1, the terminals of this coupling circuit carrying

2466161 I

  the same reference numbers as the coupling circuit

TXG1 shown in Figure 1.-

  The device coupling circuit of FIG.

  carries a B19.1 terminal by which signal signals

  transmitted by the switching hook contact, one of the selection keys or the earth button to the public network, can be received and the optical signal respective phone can be transferred. Two voltage sensitive input circuits having transistors V202 and V201 are connected by

  a shutdown coil T210 at this terminal B19.1. When the

  hook tact switch K107 of the associated telephone apparatus is open, that is, when the handset is on-hook, the voltage at the input circuit of transistor V202 appearing at the common point between resistors R208 and R209 is zero, whereas when the contact K107 is closed and under the effect of a resulting interruption

  selection pulse for the internal call, this cir-

  baked signal is not open, a voltage is present at this common point of the order of 6 to 10 volts, in

  function of the resistance of the signaling circuit

  nected. Since a threshold circuit is included in the input circuit of transistor V201 (Zener diode V205 produces an input threshold of 13 volts), this transistor V201 does not react to voltages in the range of 6 to 10 volts. volts. Since the transistor V202 is released by this voltage of the order of 6 to 10 volts, at the common point

  between the resistors R208 and R209, the two circuits

  commanders D203a and D203b which are arranged as identical JK flip-flops are released by the

  D204a and D204b toggle circuits and AND gate D202b.

  At the same time, the AND gate D202c is blocked by the cir-

cooked D204c rocker.

  When the network key Kl01 on the telephone

  partner is maneuvered, the signaling circuit terminates

  terminal 1.1-2.1 (Figure 2) is short-circuited and

  a higher voltage of the order of 15 to 18 volts, de-

* during the resistance of the signaling circuit connected

  tees, appears at terminal B19.1 of the coupling circuit. The

  Zener diode V205 is then unlocked because the voltage applied

  this exceeds the threshold voltage of 13 volts so that, by the transistor V201, a delay and cancellation circuit

  of interference comprising the capacitor C203, the resistor

  this R203, the flip-flop circuit D204d, the AND gate D202a, the controlled flip-flop circuit D203a is switched which it demands the excitation of the line relay K201 to the network. Relay contacts k201-k'201 thus function so that the conversation circuit terminating at terminals B21.1 and B20.1 is connected by lines B16.1 and B18.1 to the line to the network (Na-Nb of Figure 1). In other words, because

  from the excitation of the line relay K201 to the network, the

  The associated phone line is connected to the public network. Due to the change of state of the flip-flop circuit D203a, this flipper circuit is at the same time blocked so that it

  stays in his state. This blockage is also achieved when

  that another telephone is connected to the line to the network by the maneuver of its line

  network, in which case the respective blocking signal is

  to the coupling circuit via terminal B17.1. Because of

  this blocking, the connection established by the line to the network

you secret.

  The blocking signal produced by the change of state

  of the tilt circuit D203a is emitted by the circuit

  line B4.1 which results in the marketing of

  signal generator for the optical indication of

  line to the network that will be described later.

  ) 0 To be complete, it must be observed that during the

  lection of the line to the network, the flip-flop circuit D203b

is commatied in the same way.

  The pulses emitted by the pulse transmitter of the associated telephone apparatus, described with reference to the

  FIG. 2, comprise a certain number of pulse pulses.

  the number being equal to the number of the tele-

  requested, increased by one, these impulses

  each having a duration of 2.5 milliseconds.

2466161 1

  Each group of selection pulses is followed by a pulse lasting approximately 40 milliseconds serving

  trigger pulse for the selection register.

  The total duration of this group of selection pulses and the associated quiescent pulse is at the maximum of

  the order of 60 milliseconds so that the selection in-

  is performed with a repetition frequency of

  at least 17 times per second or so. These selection pulses

  appear as interruptions in the wires of the

  baked signal and are formed into pulses

  with the transistor V202 and the rocker circuit

  D204a, these pulses being then applied by the cir-

  tilt D404b and the AND gate D201a, on line B1.1 to the KRR selection register which will be described by

the following.

  As already mentioned, when a tele-

  phonic is connected to the line to the network, the D203a and D203b toggle circuits change state and are maintained in their new state. Since these two rocker circuits change state, no change occurs at the output of the AND gate D201c which is connected by the line B6.1 to the guard relay K502 (FIG. 7) serving for the guard switching. the line to the network, so that this K502 guard relay is not energized when the respective telephone device is connected to the network. But when,

  for example by the maneuver of a selection key, the ap-

  the same telephone number is disconnected from

  line to the network and connected to the internal common line.

  re to all other telephone devices, the circuit

  tipper D203a returns to its original state by

  selections arriving at terminal B19.1, through the

  the flip-flop circuit D204b. But the circuit

  their 203b does not return to its original state because the circuit

  delay comprising the resistors R211, R212 and the con-

  denser C206 blocks the pulses transmitted by the

  phone so that ET gate 202b does not

  not deliver the idle signal of the flip-flop circuit 203b. Since now the D203a toggle circuit

2466161 1

  has returned to the initial state and not the toggle circuit 203b, a change of state is produced at the output of the gate 201c by which the guard relay h5k is excited, and the line to the network passes to the guard position by the relay contact k502. In a similar manner, the second signal generator is connected to the first signal generator, so that optical signaling can

  to be given, characteristic of the custody situation.

  The guard relay can be released when

  from the corresponding telephone apparatus, the

  network is again selected, so that the

  D203a toggle circuit changes state again.

  When the handset is on hook, which opens the door

  K107 tact of the switch hook, the D203b toggle circuit returns to the initial state, so the condition

rest period is restored.

  The resistance that is connected to the con-

  during excitation of the K502 guard relay

has a value of 560 ohms.

  As already explained, the controlled flip-flop circuit D203a is reset as a result of the selection pulses from line B19.1.

  internal call signals. Also, the circuit

  their D203a is returned to the initial position under the effect

  when the handset hangs up when contact K107 of the handset

  Chet switch of the respective phone device is

  open. the controlled D203b toggle circuit is excluded

  returned to rest as a result of an interruption of

  signaling circuit produced by the contact of cro-

  chet switch of the respective telephone device. The delay circuit R211, R212 and C206 is sized to

  a delay of 100 milliseconds, this delay not being

  dyed with the impulses transmitted by the transmitter of im-

  impulses from the respective telephone An im-

  40 millisecond quiescent pulse produced by the pulse emitter is therefore the only one that

  rest the counter not yet described associated with the re-

Selection Office.

2466161,

  The flip-flop circuit D103b can also be reduced to

  the initial state by the AND gate D201d by which the

  Outputs of the rocker circuits, for example D203a but forming part of the device coupling circuits associated with each of the other telephones, are compared with the output of the flip-flop circuit D203a in the coupling circuit of the respective apparatus. , to prevent the line to the network being warned

  when another telephone device disconnects the

nexion with this line.

  In given circumstances, it is desirable to connect one or both wires of the line to the network at

  the earth and for this reason the telephone

  It has an X301 earth relay (Figure 7). From each telephone apparatus, this earth relay can be excited by the associated coupling circuit, for example by operating the line key to the network, for example K101, after it has already been maneuvered a first time on the respective telephone apparatus. When the line key to the network is operated for the first time, as already explained, the controlled flip-flop circuit D203a is blocked while at the same time the AND gate D202a

  is blocked. The AND gate D201b now combines a change

  signal level produced by a second possible operation of the line key to the network, with the signal developed at the output of the flip-flop circuit D204f so

  that if the line key to the network is operated one se-

  At the output of the gate D201b, a change of state occurs which, via the B2 / 5.1 line and the NBK line control circuit not yet described, excites the earth relay K301. So the relay contacts

  k301 and / or k'301 change position, so that the

connection to the earth is established.

  In addition, each telephone device coupling circuit

  includes a K202 call signal relay for the signal

  internal acoustic call signal. The dual control signal

  of this call signal relay is produced by the selection register KRR, this signal being applied via the line B3.1 to the transistor V203 and to a control circuit 2466161 1 having an AND gate B202c for the signal relay. 'ap-

  K202 pel. When this relay is excited, the contacts k202 and

  k'202 change state so that the conversation circuit

  of the respective telephone set is connected to an alternating voltage of about 60 volts and a frequency of 50 Hz, produced by a generator associated with the base unit BED, to produce the call signal. acoustic signaling the inner call. When the handset of the called telephone is off-hooked, the gate D202c is locked 1o so that the call signal relay K202 is de-energized. As already indicated, a sinusoidal voltage

  is produced by the generator for optimum signaling

  that a peak-to-peak value of 20 volts and a frequency of

  18 kHz, so that a signal intended for the

  optical alignment is conducted by the driver B7.1 of the respective device coupling circuit. This conductor contains a tuned circuit comprising a resistor R219, an inductor T202 and a capacitor C209 to avoid any radiation at the high frequency produced by this signal at 18 kHz in established standards. The capacitor C201 is a DC voltage separating capacitor by which the DC voltages produced in

  the signaling circuit of the telephone apparatus

  are separated from the output amplifier of the genera-

  signal. The T201 choke coil has a high impedance for the signal of a frequency of 18 kiHz so

  that the alternative signal has no influence on the

  digital control. The R219 resistor has the same

  a current limiting function.

  In order to exclude any damage and / or defect in a conversation circuit, the guard resistors R215 and R218 have been incorporated; in a similar manner, the guard resistors R216 and R217 have been applied for

the inner call.

  Figure 7 is a more detailed diagram of a circuit

  NBK line control to the network common to all

  telephone lines and all loopback circuits

2466161 I

  devices. The NBK control circuit is part of the central processing unit and is associated with the performance of the following functions; blocking

  together with the line function to the network; com-

  to call the guard relay; order the earth relay

  handle an incoming call on the line to the network or connect

  exterior xion; start the optical occupancy signal from

  line to the network; produce a characteristic optical signal

  only from the incoming call through the line to the network; and produce

  1o an optical signal characteristic of the guard state.

  When a telephone is connected to the

  On the network, a characteristic indication is given to a respective one of the inputs C5, C2, C8, C11, C13 from the device coupling circuit associated with the telephone apparatus which has been connected to the line. to the network. As a result of this line indication to the network, a state change occurs at the output of the AND gate D305a which, without delay, is transmitted by the wires C20 and C24 to all the device coupling circuits ( terminals B15.1-B15.4 and B17.1 and B17.5). As a result, the call connection formed with the line to the network remains secret. Via the circuit comprising the diode V315, the resistors R320 and R321, the capacitor

  C309 and the D307a toggle circuit, a delay is introduced

  so that the blocking signal on the wire C19 can be released only 1.5 seconds after the end of the state of occupation of the line to the network. This release signal is applied to all device coupling circuits at terminals B14.1-B14.5. During this time period, the central office to which the line to the network is connected is released, so that a call when finished

  can not be picked up by another phone.

  The K502 guard relay is intended for the guard state of

  the line to the network and he is excited by the circuit of com

  line control to the network by its output conductor C22.

  The terminals B6.1-B6.5 of the respective coupling circuit TKC1 TKG5 are connected to the inputs C15, C12, C9, C6 and C3 of an input circuit comprising AND gate circuits.

2466161 X

  D306a and D3Ola, in the excitation circuit of the guard relay K502. The outputs of these gate circuits control a switching transistor V302, the arrangement being such that if the line to the network is switched to the guard state by one of the telephones, a change of state occurs at the a respective input C15-C3, which results in the transistor V302 is unlocked and the guard relay K502 is excited. This relay K502 is part of

the basic unit BED.

  IC The line control circuit to the network also ensures

  the excitation of the earth relay E301, namely by an input circuit comprising D305b gate circuits

  and D303a of this excitation circuit. Terminals B2 / 5.1-

  B2 / 5.5 coupling circuits TKG1-TKG5 are connected to the inputs C14, C10C7, C01 and C4 of this input circuit so that when a ground button function is

  triggered at one of the telephones, a change

  This state of affairs occurs at a respective one of its inputs, which results in that the transistor V303 of the circuit

  excitation goes into the conductive state; the relay of

  re is excited and the desired connection to the ground is established.

  Optionally, only the wire from the line to the network can

  be connected to the earth by removing a connection.

  If the earth button function is not needed,

  the X301 earth relay can be put into service by

  taking over the connection to his + wire. This avoids unwanted switching blisters and unnecessary power consumption. In this respect, it should be noted that the input circuits described above can be made with standard elements in C-MOS technique and this because of the fact that

  one in five of these input circuits is connected

  at an entrance to a separate AND gate.

  From the input circuit comprising the gates D305a and D3O1c, and by one of the inputs C13-C5, by the flip-flop circuit B307e, the AND gate 306b and the AND gate D303b, the switching transistor V301 is placed at the gate conductive state, whereby a start signal is

2466161 3

  produced on the C23 wire to the signal generator that is part of the BED base unit for the productinn of the

  optical signal of line occupation to the network. Comes

  has already been indicated, this indication of occupation is given by a signal lamp which is lit

  continuously on the telephones concerned.

  The line control circuit to the network comprises

  also a signal generator with a circuit of

  an associated call by the line to the network, in response to the incoming call signal, the signal generator is connected to the aforementioned signal generator

  the optical signal of line occupation to the network,

  that a resulting signal is produced, characteristic of the incoming call on the line to the network. This situation

  may be indicated on the telephone

  by an optical signal with a scintillating frequency

  characteristic (4 Hz). The input circuit is

  connected to the line to the network by wires C21 and C26.

  During an existing call, this circuit remains

  connected to the line to the network because it presents an impedance

  this high input. This input circuit comprises a four-branch diode bridge circuit comprising the diodes v3o6, V307, V308 and V309. This bridge circuit rectifies a call signal (frequency 25 or 50 Hz) from the line to the network, the rectified signal controlling a coupler

  Optical D302 (similar to that used in the unit

  xilary mentioned above); it follows that

  the resistors R312, R310, the transistor V304 and the resistor

  R311, the triac V311 is unlocked. Ringtones connected to the trunk (no more than five) receive

  the inrush current of the power transformer

  part of the BED base unit, thus producing the acoustic signals indicating that a call is

the line to the network.

  During an established communication with the line to the network, the optical coupler D302 is blocked by the locking lines and the flip-flop circuit D307d, so that

2466161 I

  the selection pulses do not affect the functions

signaling.

  Due to the change of state of transistor V304 in

  answer to an incoming call on the line to the network, the gen-

  The signal generator optically indicates that a call arrives on that line, and is connected to the signal generator producing the optical line busy signal to the network. For this purpose, the output of the transistor V304 is also connected to a delay circuit having a resistor R309 and a capacitor C305, so that the intervals of the call signal from the line to the network are covered; thus, in the case of this call on the line to the network, a constant signal is present

  at the output of the D307f toggle circuit. This signal

  of the signal generator including AND gates D304c

  and D304d to produce a rectangular signal of one frequency

  4 Hz. This signal generator is started by gate D304b, the output signal being provided by the

  AND gate D306b (input contact 11), and through

  re of the gate D303b and the transistor V301. This signal constitutes a modulation signal of the signal generator

  producing a sinusoidal signal with a frequency of 18 kHz.

  Resistors R304 and R305 limit the voltage at the inputs

  gate of this modulation signal generator.

:

2466161]

  For optical signaling from the line to the network, the line control circuit to the network comprises

  further another signal modulator which is dimension-

  to produce a rectangular output signal of a frequency of 1 Hz, so that an optical signal characterizing the guard state can be produced. In response to an excitation signal generated for the above-mentioned guard relay K502, this further modulation signal generator is started by the gate D301a so that, by the AND gate D303b and the switching transistor V301, this rectangular modulation signal is combined with the signal of the aforementioned signal generator to produce a

  sine wave with a frequency of 1R kHz.

  Finally, the line control circuit to the network offers the possibility of using the telephone installation in

  combination with a different internal automatic device

  rent, for example a device called "WB". It then possible

  that the optical signaling of the installation is trans-

  from the other installation. This possibility is provided by the input circuit comprising a switching transistor V317. For this purpose, the wires C30 and 031 are

  connected to the BSa and BSb terminals to which the other

  lation is connected. When, as a result of switching in the other installation, these contacts are interconnected (on a maximum impedance of 10 IKilohms), the transistor V317 starts the aforementioned signal generator to produce a sinusoidal signal with a frequency of 18. kHz by

  the gates D304a, D306b, D303b and the transistor V301. The seat

  call on the line to the network and the sipnalisa-

  custody of the line to the network have priority over

  this occupation signaling (D304a and D304b).

  Figure 9 is a more detailed schematic of the KRP selection register serving the internal call. This selection register, as well as the line control circuit to the network and each of the coupling circuits used is a

  modular unit forming part of the central processing unit

ment.

  The selection register comprises five circuits of

  identical with the possibility of blocking, a

2466161]

  a reading and resting circuit and a cir-

  cooked out. Each of the input circuits is connected

  to a partner in the circuits of couplae of tele-

  phonic. Therefore, in a telephone installation

  5 terminals, terminals B1.1 to B1.5 of the respective coupling circuits are connected to the inputs D10,

  DP, D6,) 4 and D2 of the selection register.

  Each of the input circuits has a bi-directional circuit.

  controlled stability (JK rocker circuit) such that the cir-

  cooked D401b, D401a, D402b, D402a and D403a. at a cir-

  Delayed bake comprising the diode V401i, the resistors R4l01 and R402 and the capacitor C401, the respective input circuit is rendered insensitive to spurious pulses, ie the flip-flop circuit D401b is not released by the input R before 20 ms about following a transition

Incoming switching.

  Since, as explained above, a pulse sequence transmitted by the respective pulse transmitter for the inside call always starts with a

  initial impulse acting as a control impulse

  pos (about 40 milliseconds), the respective D401b flip-flop circuit is always in a state

  passage of the first selection pulses of the se-

  quence by the associated AND gate D404c. In addition, the flip-flop circuit 401b is arranged such that on receipt of this pulse sequence, it blocks the other input circuits of the selection register which can not take more than one pulse sequence that time. This blockage is obtained by the fact that the respective outputs of the circuit

  tipper as part of the input circuits are connected

  to the AND gates D405a and D409d, the input switching circuits being blocked by the D409c

  by their respective inputs J and K. A pulse sequence

  transmitted by the input toggle circuit

  for example B401b, can reach the accounting entry

  B408 counter geometry through the D405b and D409a doors. One

  The number of pulses applied to this count input consists of two selection pulses and one pulse.

  when the phone is called.

2466161 I

  The two selection pulses produce three transitions.

  If the device # 1 has been selected, the output of the counter D408 corresponding to

* This unit (wire 7) is marked.

  Each output of the meter corresponds to one of the

  telephone numbers of the installation and it is

  connected to a separate and associated input of an output circuit constituted by a functioning 6D toggle circuit

  in memory circuit. The entry R of zero of the count

  D40R and the read input C1 as well as the input R of the output circuit D407 is connected to a read and set circuit including the gates D406a,

  D406b and D409b. The diode D406, the resistor R411, the

  C406 and the R412 resistor constitute a

  baked delay whereby the selection pulses (2.5 milliseconds) from the gate D409a are suppressed so that the input 2 of the gate D406a can receive exclusively the quiescent pulses. It follows from this impulse of resting that it appears at the

  output 5 of the gate D406b a level "1" of a duration of

  about 35 ms. But when these selection pulses are delivered by the gate D409a, the input 5 of the gate D406b is at the level "0" -so that the selection pulses have no influence on the output signal of this gate. The level "1" * r produced at the input 5 of the gate D406b

  is used to read the memory D407. More specifically

  In response to the positive transition of the read pulse applied by the input 5 of the gate D406b to the input D1, the flip-flop circuit D407 overcomes the position of the counter D408 while maintaining this position at one end. corresponding outputs D9, D7, D5, D3 and D1 up to

  the appearance of the next positive transition of an im-

  reading pulse. In other words, when the tele-

  1 has been selected, the output D9 leading to the device coupling circuit TK <1 is permanently

state "1".

  Resistor R413 and capacitor C407 constitute

  further kill a delay circuit by which the quiescent pulse associated with a pulse train is

2466161 J

  delayed compared to a resting pulse

  supplied directly to the inlet 6 of the door D406b of

  which appears at the exit of this door an impulse

  a differential period of about 1 millisecond, whereby the counter D408 is brought to rest with

  precision to receive new selection pulses

tion.

  The processed blocking signal produced by a corre-

  coupling input tilt circuits, for example D401b is also applied to the input 1 of the gate D406a so that also at the end of a pulse tran cycle

  the counter D408g is automatically returned to idle.

  This blocking input also functions as the input R of setting "0" of the output circuit D407, so that

  this memory is also brought to rest.

  As already explained, a signal produced at

  one of the outputs of the memory D407 excites, by means of

  of the respective device coupling circuit, the call signal relay K202 for the internal call of

the requested telephone

  FIG. 9 is a group of waveforms A-F illus-

  the operation of the selection register described above.

  above. Figure 9 shows in A (from left to right)

  in the figure) a rest interval 1, a group of im-

  selection pulses 2 and a resting pulse

  3, at the input 14 of the counter D408a.

  FIG. 9 shows in b the waveform of the signal cor-

  respondent developed by the capacitor D406, while the signal appearing at the output 3 of the gate D406a is represented in C.

  FIG. 9 shows in D the waveform of the signal

  plicated at the same entrance of the D407 output circuit and this

  signal is produced locally under the effect of the signal

  lopped by the capacitor D407 (at E in FIG. 9).

  The signal appearing at the output of the gate D406b is represented at F in FIG. 9. This signal is produced under

  the effect of the signals represented in A and E. During the inter-

  time range t1 to t2, the selection pulses are

24661-61 3

  counted by the counter D40R. At time t3, (transient

  of the impulse represented in d on the

  FIG. 9) the position of the counter D408 is transmitted to the input of the output circuit D407 and this information is retransmitted to the outputs. This information remains locally until the appearance of the next pulse (d in Figure 9). This output information does not change when it appears from the following pulse (in d in FIG. 9) that the counter nD408R is in the same counting position, because the present information

  at the inputs of the D407 output circuit is the same as

during the previous reading.

  A resting operation begins at

stant t4.

  Figure 10 is another detailed schematic of the uni-

  BEI base unit) associated with the central processing unit

  and constituting the connection between printed circuits

  such as the device coupling circuits, the line control circuit to the network and the selection register. This basic unit also formed on a

  printed circuit board which also includes the general

  signal generator for optical signaling (18 kHz), power supply for the speech circuit; the power supply for the outgoing signaling of a telephone apparatus; the power supply for the aforementioned signal generator, in view

  optical signaling; the supply of the circuits

  poles and corresponding relays; feeding for the

  acoustic signaling; the K502 guard relay; the re-

  lais K501 voltage control to the mains; and terminators

  contact with protective devices.

  The power transformer is located outside

  of the printed circuit board.

  The signal generator above includes the amplification

  D502 operational indicator including capacitors 0504 and

  C.505 and the resistance R515 are defined

  the frequency. The diodes V506 and V507 connected in op-

  position constitute with resistors R503, R505 and

R506 an amplifier circuit.

2466161 1

  When the resistor R501, a starting signal

  signal generator is received from the input

  C23, and goes to the "0" level, the vibration increases relative-

  slowly to the full amplitude so that no peaks or interference appear

  undesirable. Similarly, the amplification decreases progressively

  when the signal generator is stopped. The start time is 250 microseconds and the stop time is 300 microseconds. The sinusoidal signal at the frequency of 1R kHz produced by the signal generator is amplified by the power amplifier D501 and the output stage

  symmetrical with transistors V501 and V502. With the cir-

  tuned cookie described in conjunction with the cooking circuit

  range of equipment, resistance R219, coil T202, capacitor

  0209, the sinusoidal signal circuit of 1-8 kHz produces high frequency attenuation, which

  avoids unwanted radiation.

  Conversation circuits serving internal traffic

  interior of the installation are powered by a source

  power supply which, from a voltage of the

  220 V, delivers a minimum voltage of 49 volts.

  If the mains voltage increases, this voltage is limited

at 51 volts.

  Transformer T501 has a high impedance for the AC component and transforms the voltage

  of call, so that an acoustic call is also audible

  to the calling telephone system to verify that the called device is receiving the inrush current. The diodes

  zener V508, V509 and V514, V515 limit the inductive peaks

  which may be produced during an internal connection

  in the case of dial operation. Likewise, the base unit has a feed portion for the outgoing signaling from a telephone

  and for the electronic part of this device. This part

  The power supply comprises the integrated circuit D503 and the transistors V526 and V504 so as to provide a voltage

  stabilized 27 volts. This output voltage is

  high frequency by capacitors C500 and 0511.

2466161 1

  A limited integrated circuit power supply is present and the 27 Volt voltage is stabilized at a current value of about 500 milliamps. The resistors 521 and 522 are current limiters and the resistors R524 and R529 determine the applied voltage. Since the operational amplifiers and

  the balanced output stage of the signal generator

  When the voltage at a frequency of 18 kHz imposes a positive-negative power supply, the available voltage of 27 volts is divided by the voltage divider formed by the resistors R520 and R528. It thus appears at the common point between these resistors a voltage of 13.5 volts which serves as level 0 for the supply of the signal generator and with respect to this zero voltage, a voltage of

  of -13.5 Votts and a voltage of +13.5 Volts are available.

  ble. Capacitors C508 and C511 lower the internal impedance of the power supply portion of the signal generator to a minimum. The power required for integrated circuits and relays is provided by a power supply portion including the integrated circuit

  1504 and the transistor T505. The supply voltage pro-

  This power supply has a value of 10V and is stabilized at 0.2 Volts for current consumption between 0 and 250 milliamps. The maximum voltage of the source is only 1.3 millivolts. With the circuit

  of high frequency suppression including

  C514 and C513, this power supply is

  nible, suitable for integrated circuits. As long as the voltage of 10 V is present, as has already been observed, the relay K501 mains voltage control is excited while if this voltage disappears, this relay fills

  a switching function that has already been described.

  Therefore, when the mains voltage is cut off, the relay contacts k501 and k'501 directly connect the conversation wires of the telephone set 1 to the

  line to the network; thus, the telephone system does not function

  more, but the NO 1 telephone

  as a normal telephone device on which calls from the network link are signaled

2466161]

  allowing conversations with the public network.

  With regard to internal call signals, a ringing tone or buzzer in the telephone

  asked produces an acoustic signal. The alternating voltage

  tive (60 Volts) required for this purpose is produced by the power transformer. Since in the case of a call from the trunk

  corresponding ringtones, (additional) are supplied

  from this transformer, also 60 volts, from winding T501. Similarly, since the triac is switched for this signaling, one side of the AC voltage source is connected to the zero conductor

  DC voltage terminals for 10 volts and 27 volts.

  This zero point is chosen in the center of the cir-

  cooked printed to avoid the tensions.

  All incoming and outgoing wires may be suitable

  terminated and connected to the baseplate. The

  network, the land line if it exists, the trunk ring or the ringtones of that line,

  optical occupancy signaling from the

  outdoor stallation, the five telephone sets

  with the earth if it exists, and the mains voltage.

  The other secondary windings of the power transformer are protected by safety fuses

F501, F502, F503 and F504.

  The R530-R549 resistors mounted on the base plate have the effect of maintaining the input levels of the various circuits at level "1" (10 volts), to ensure correct operation of the telephone system when one or several coupling circuits

are missing.

  The double zener diodes V528 - V533 protect

  in the case of extremely high voltages

and stormy discharges.

  Resistor R551 with capacitor C516 forms

  a wire that eliminates the interference that can be

  by one or more of the trunk rings.

  The power transformer is ready for the

  inside the printed circuit board, on the plate

  base of a plastic casing. The secondary side

  has four windings to provide the

  described above while the primary side has a temperature limiter that disconnects at 1150 C and can not be re-established. Consumption at 220 volts when handsets are hung up is

Watts.

  Of course, various modifications may be made by those skilled in the art to the installation described and illustrated by way of non-limiting example and without

depart from the scope of the invention.

2466161]

Claims (9)

  1 - Telephone device for private use   number of telephone sets or   auxiliaries, in which intercommunica-   between these telephones can be handled by a common line of intercommunication, and external traffic can be processed by a line to the network common to telephone devices, each of which is connected to a central processing unit arranged to control and to perform the switching functions and   necessary to handle external traffic.   and internal traffic, a device characterized in that   each of the telephone sets (TKN1-TKNS)   part of the telephone system includes, for each   each of the other telephones he can call, a selection key (K102 - 106), separate assigned to each telephone to be called, each device   telephone system comprising a control circuit which, in   a single operation of one of these keys   associated selection produces an electrical selection signal   which uniquely defines the identity of a tele-   mentioned in the device, and each telephone device   additionally comprising a transmitter (D101-D103) for im-   electrical impulses arranged to emit, in   in response to this electrical selection signal, a sequence of selection pulses indicating the identity of the requested telephone apparatus in the system, and also for generating an initial pulse of a predetermined duration   preceding each sequence of selection pulses, a   positive being planned to open and close a signal circuit   connected to said central processing unit   controlling the pulses produced by said transmitter.   2 - Device according to claim 1, characterized in that said pulse transmitter comprises a source (D103) of clock pulses which produces clock pulses each having a duration which determines the duration of the selection pulses, a main counter lable by said selection signal and which, in response to a selected signal at its input, performs a number of steps   corresponding to the value of the selection signal   applied, increased by one, and an auxiliary counter   (D102) which, in response to clock pulses from said source of clock pulses, and   to an exit signal from the master counter,   of the counting action of said main counter so   that through door circuits that combine   the clock pulses and the output signals of the   main counter and the auxiliary counter, independently   the period of operation of the respective selection key, at least one complete sequence of pulses, comprising an initial pulse and a plurality of selection pulses, indicating the respective called telephone apparatus, followed by an incomplete pulse sequence,   comprising an initial pulse and a pulse of   tion, are transmitted to said central processing unit.   3 - Device according to claim 1 or 2, in the-   each telephone set of the set comprises a signal lamp, characterized in that each of said selection keys (K102, K106) is arranged so that when it is operated, it   also produces a short circuit of the signal lamp   the telephone concerned.   4 - Device according to any one of the claims   I to 3, characterized in that each telephone apparatus   is a normal construction apparatus con-   taking a conversation circuit, and a separate auxiliary unit comprising said selection keys (K102-K106), a network selection key (K101), a lamp   signal, said control circuit and said transmitter   electrical pulses (D101, D103), and in which, via an optical coupler in said auxiliary unit, the current variations in the speech circuit of said telephone apparatus, for example due to on-hooking and unhooking, can be detected so that, according to said current variations, the unit 2466161 1   the auxiliary is connected or not to the central unit of   treatment by a two-wire signaling circuit.   - Device according to any one of the   1 to 4, wherein said central processing unit   includes an internal call signaling device, said signaling device comprising a selection pulse counter and operating in response to a selection pulse sequence received in   applying a switching signal for the tele-   tone specified by said pulse sequence of se-   to a separate switching circuit associated with the respective telephone apparatus requested, this circuit of   switching, in response to said switching signal, de-   connecting the conversation circuit of the tele-   requested and connecting it to a signal generator.   common to all telephones to produce an audible signal characteristic of an internal call, characterized in that the output of the selection pulse counter (D40R) is connected to   a memory (D407) of selection pulses, one of which   reading signal (9, D407) is connected to a cir-   cooked read or quit signals (D406a,   D406b, D409b) also connected to the reset input   pos (15, D408) of the selection pulse counter, the   provision being such that in response to a read signal   produced by said read or quit signal circuit, a switching signal is generated at an output separate from the selection pulse memory, which output signal is indicated by the count of the selection pulse counter. and that each time after the end of a received selection pulse sequence, a quiescent signal is applied to the quiescent inputs   the selection pulse counter and the memory   selection pulses by said read signal circuit ture or resting.   6 - Device according to claim 5, characterized   in that said signaling device comprises several   separate input circuits that can be connected 2466161]   one at a time, by gate circuits, at the input of the selection pulse counter, characterized   in that each input circuit has a bi-directional circuit   controllable utable (D4001a, D401b, D402a, D402b, D403a) which, in response to selection pulses which are supplied to it on the one hand by the gate circuits connected to the output of the respective controlled bistable circuit, so that   said selection pulses can reach the   of the selection pulse counter, and on the other hand, a blocking signal is produced for all other bistable circuits in order to block the circuit between   said circuits and the selection pulse counter.   7 - Device according to claim 6, characterized in that all the orifices of said controlled bistable circuits to which a blocking signal for others   said bistable circuits can be produced, are connected   to another gate circuit (D405a, D409b, D409c) by   which, after the end of the reception of the pulses of se-   selection, a signal of resting said memory of im-   selection pulses and said pulse counter of selection is produced.   8 - Device according to any one of the claims   1 to 7, wherein said central processing unit   There is provided a line control circuit to the network for processing the traffic with the line to the network, this line control circuit to the network, in response to the   connection of a telephone device to said line to the rd-   bucket, is connected to a first signal generator for   to produce an optical signal characteristic of the state of oc-   from the line to the network for all the circuits of   two-wire signaling connected to telephone   of the whole, so as to produce an op-   characteristic of this condition of occupation to the telephones, and, in response to a switching action in a telephone apparatus by which the lattice to the network is placed in a state of guard, connects a second signal generator to said first signal generator of in such a way that a characteristic optical signal 2466161 1 of the Larde state of the line to the network is provided to all the telephones, characterized in that said line control circuit to the network is   further arranged so that, in response to a signal of   pel from the line to the network, he connects a third   signal generator (D304d, D304c) to said first   signal generator (D502, C504, R515, C505) to produce an optical signal characteristic of this incoming call by the   line to the network for the signaling circuits   connected to the respective telephones.   9 - Device according to claim A, characterized   in that a call signal from the line to the network is converted by an optical coupling circuit (D302) into a start signal of said third generator of signals.   - Device according to any one of the   1 to 9, wherein the central processing unit has, for each telephone unit in the set, a separate coupling unit which serves as an interface between this telephone set and the other sections of the central processing unit, characterized in that each interface circuit has two rocker circuits   ordered (D203b, D203a) included respectively in a first   first circuit (V202) responsive to the voltage reacting to   voltage fluctuations produced by the switching actions   switch hook of the telephone as-   company or internal call selection impulses   transmitted by that telephone, and a second cir-   bake (207) responsive to the voltage responsive exclusively to voltage variations produced by the operation of the   line key to the telephone network of the telephone   cié, the two rocker circuits controlling in combination   a line relay to the network, intended to carry out the con-   connection with the line to the network, a guard relay to place the line to the network in the guard position, and also the blocking of the other toggle circuit (D203a), all this   as a function of the control voltages applied to said cir- cooked sensitive to tension.   11 - Device according to claim 10, characterized   characterized in that, after operation of the line key on the network of a telephone apparatus, a second control voltage is applied to said second voltage sensitive circuit during period P. the apparatus. phone is off the hook, the second toggle circuit (D303a) included in this circuit does not change state,   so that the output signal of said second circuit   in combination with said second voltage   sends a ground relay (301) to connect one or two conversation wires to the ground of the   telephone conversation.