DE1020379B - Circuit arrangement for telephone private branch exchanges with inquiry facility and transfer of exchange connections - Google Patents

Description

There are circuit arrangements for transmissions of connection lines or trunk lines with inquiry and Assignment known in which two feed bridges are provided for the local speech paths, each Feed bridge circuit elements for calling a local subscriber are assigned.

In such circuit arrangements, two sets of call members are therefore to be provided, which is a considerable one Required effort and a corresponding space requirement for the relevant transmissions.

In addition, both feed bridges not only have to be used for microphone feed, but also for recording the series of elections, the transmission of the acoustic signals and the recording and evaluation of the control signals be set up for the consultation and the transfer.

Finally, there is also the use of a pulse distortion device for the transmission of the series of elective current surges to one outgoing (connecting or exchange line) or local speech path is made more difficult by the fact that both pulse relays the two feed bridges can be exposed to the influence of the number switches of telephone stations, which are each connected to two of the local speech channels.

The invention relates to a circuit arrangement for telephone private branch exchanges with an inquiry facility and transfer of trunk connections, in which the line selectors when they are immediately seized or assignment via interposed dialing levels from an exchange transmission from the speech wires galvanically switch through, whereby separate feed bridges are provided for the microphone feed of the auxiliary units, and consists in the fact that the office transfers are each assigned two feed bridges and only in one of the two Feed bridges additional switching means for evaluating the end-of-dial signal transmitted via the inquiry path, the free or busy status of the called subscriber and for sending calls are provided and that switching means reevaluate the official transmissions in such a way that in the case of the inquiry and Transfer of an exchange connection, the feed bridge with the additional switching means, the inquiry path and the other feed bridge is assigned to the extension to be connected to the exchange line.

According to a further embodiment of the invention, the second feed bridge is linked without calling each to the local speech path switched on, on which a speech station is located, from which the triggering of the switching device is dependent.

The first feed bridge to which the circuit elements for calling a local subscriber are assigned are, however, will be sent to the local speech channel switched on at which a called station is located, and remains connected to this speech channel until the circuit is arranged

for telephone exchange systems

with the possibility of inquiries and assignment

of trunk connections

Applicant:

ίο Siemens Societä per Azioni,

Milan (Italy)

Representative: Dipl.-Ing. Dr.-Ing. H. Idel, patent attorney,
Essen, Kettwiger Str. 36

Claimed priority:
Italy from November 19, 1954

Dipl.-Ing. Giorgie Dal Monte, Milan (Italy),
has been named as the inventor

the triggering of the switching device depends on the called station or until the calling station releases the connection with the called station.

Further details of the invention are explained using an exemplary embodiment and can also can be taken from the claims.

In the drawing, an embodiment of the invention is shown, but the latter is not is limited. The drawing shows the principle flow of an exchange transmission for private branch exchanges, in which all details are omitted which are not necessary for an understanding of the concept of the invention are.

The transmission has two local speech paths al / 61, "2 / δ2 and is AJB on another speech with a public office connected.

It is assumed that an extension is connected to the exchange line ajb via the speech path alJb 1, the latter of this extension, e.g. B. by the officer of the private branch exchange, was allocated in a manner not shown. The extension unit receives its microphone feed via the feed bridge X 2, S2:

-I-, 52, X2, g ₂ ^s , 51-wire, (subscriber station), «1-wire, g ₂ ² , X2, S2, -.

In this circuit, the relay S 2 is addressed, whereas the relay X2, which is in a differential circuit

709 808/95

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can not respond. The outside line is via the following At the end of the election, a line voter is on the

Circuit occupied: connection of the desired participant set. In

«-Ader from the exchange line, s2 \ Dr2, Ö-wire for ^the exchange transfer, the relay V drops after the last one

Trunk line impulse series delayed from, and in the line selector

5, the «2-wire is connected to the

The two speech paths α 1 / bl, ajb are connected to the desired subscriber connection to earth. To the-

coupled via the transformer U. As soon as the subscriber says, the relay Co speaks in the trunk transmission

the extension number of the desired exchange to

If the participant chooses, the relay S 2 drops in the rhythm of _{Q v> Q} ^ _{1 pz 4 a2} . _{Wire switched through}

Current impulses sent by the number switch from io _{to line selector j + in the} line selector, which are sent to the exchange line via contact S2 ¹

be delivered. Instead of the contact S2 ¹ , the relay Co switches on the relay F,

the office loop the contact of one through the relay S 2 over

controlled pulse equalizer be arranged. __ _; p _{t c0} \ _tz ^ _j__

During the exchange call, the calling 15th

Establish a local consultation call extension. If the called subscriber is free, the line manager can

d. H. Another call station with the same extension selector completes the test process and switches

call the system and use the existing exchange connection through the speech wires «2 / Ö2 to the called station,

leave on hold. In this case, the earth potential is pressed by the α2 wire

Participant briefly presses the earth button of his station. Disconnected in 20 so that the relay Co drops out. As a result, will

In this case the differential relay X 2 is energized asymmetrically via the relay PR

trically excited and responds in the following circuit: fl col

-, S2, X2, g ₂ ² , «1-wire (subscriber station, '' (later j> r \)

Earth key, +). _{ag During the} release time of relay F, which is through

During the occupancy time of the transmission, the contact col was switched off, a response

Not shown occupancy relay C addressed. The circuit for the relay CH closed:

Contact ^ r ₂ ^{1 of} the differential relay X2 now switches the ""

Relay Y via contact c2 of the occupancy relay C ~ ' ^LH>co2> P ^r5> ' ² ' ⁺ -

on: 30 The desired subscriber receives the first call in

-, Y, zl, χ, ¹ , χ ^x , c2, +. the following circuit:

As soon as the subscriber presses the earth key of his station --Ader, _C Ä4, 51 CAIg ₂ ^, «2-wire, called station,

lets go, the relay X2 drops out because its counterwinding 6 ^ -Ader, g ^, chi, 51, +.

lungs are again aroused symmetrically. Contact X ₂ ¹ 35 The acoustic signal with 450 Hz is returned to its rest position so that relay Z normally open contact chZ to relay S 2 (winding 5-6)

comes to the response: created. The calling subscriber receives the dial tone

., inductively via the windings 1-2,3-4 of the same relay S 2.

-, Y ₁ - -, Z, yl, c2, -J-. Relay 51 does not respond to the ringing current (which

^{% z} ' ^{% 1} 40, for example, with your own, not shown

After it has responded, relay Z keeps contact, which is a winding of the same relay briefly together with relay Y in the following circuit: closes, is delayed).

7 .. After the relay F has dropped out, the circuit for

-, - - '- -, Z, yl, c2, +. the relay CH interrupted, so that the first call

'^ ² ' ^Xl 45 is terminated. After his first apostasy, it will

During the consultation call, the working relay CH now secures the hold state of the exchange line in a 5 "rhythm in the following contact ζ2 by energizing the circuit:

keeps the speech loop ajb closed. The working qj ^ 2 φ _γ $ f 2 5 "wire

contact ^ 5 places earth on the c 2- wire and occupies, ''

if necessary via a preselection device, a first 50 is given to the relay CH a corresponding group selector or a line selector. The calling delay, so the call from the trunk transmission, the subscriber receives the local dialing signal, which is different from a normal house call, despite the same rhythm by the occupied group dialer or line dialer , is given via the voice wires a2jb2, which of their- that it has a longer duration.

on the other hand with the voice wires aljbl via the transformer U 55. The forwarding of the ringing current and the dial tone are coupled, since the switching contacts y2, v3 are carried out in the manner already described for the first call

are laid. Way.

When dialing the desired call number, the AC voltage is the DC voltage of the

Relay 52 superimposed in the rhythm of the number switch official battery, so that the relay 51 from the given impulse. The contact S ₂ ² or a 60 reporting of the called subscriber can respond, contact of a pulse controlled by the relay 52, whereby the corresponding loop a2jb2 direct current equalizer repeats the dialing current surges, whereby it is closed in moderately. The relay 51 can thus interrupt the following circuit at the same rhythm - both during a call (relay CH addressed) that is switched through to the selected voter: as well as during the pause between two consecutive - Wi2 s, ² DrI z3 i> r1 s ⁵ Ö2 vein for ⁶ S ^fol g ^{receiving calls} (relay dropped CiT) are excited.

When voters reached ^{Nacil, the} called subscriber reported that they did

Relay 51 over

During each series of impulses, this is delayed

Relay F energized via _ _; jy ^ _CÄ4j 5 ^ _X1> p _{3> g} ^ _a 2-wire, called

-, F, s _a ³ , c2, +. 70 station, & 2-wire, g ₂ ⁵ , pri, Xl, 51, +.

5 6

In this circuit, the differential relay Xl drops the relay Xl and causes the switching on of the

do not address. In the meantime, the Kon relay G2, which, together with the relay Gi clock s 1 , keeps the two relays Co and F switched on again, as well as the dropping of the relay Z.

The normally closed contact g _x ³ triggers the speech path al [b 1

F si 5 upstream connecting devices by sub-

""' Co, pr2' (later col) ' ^% ' Break of the corresponding assignment wire c 1. Of the

Normally open _{contact ^ 1} ² , however, maintains the connection

The relay PR continues via its contact -ptl directions of the speech path «2 / & 2 by switching on. The contact co2 keeps the circuit for the earth of the corresponding occupancy wire c2, also interrupted after relay CH and thus prevents an OK opening of the normally open contact z5, continues to be occupied. In the renewed transmission of the ringing current and the corresponding interim time, the normally open contact z4 had the holding current of the dial tone. circuits for the relays Co, F and PR are interrupted.

The calling station is still over the bridge X 2, S 2, the exchange connection now runs over the speech

the called station, on the other hand, is fed via the bridge Xl, Sl away a2 [b2, which is fed by the bridge X2, S2. The consultation call takes place via the two 15 and via the carrier U and the contacts g ₂ ⁱ , g ₂ ⁵ local speech channels aljbl, a2 \ b2, which is coupled to the exchange line. others are coupled via the transformer U. To z. B. to conduct a home consultation call, presses

At the end of the consultation call, the subscriber calling can briefly press the earth button on his station. Subscriber who remained in the waiting state The relay X2 responds briefly and switches the series conversation by briefly pressing his earth button again 20 after the relays Y and Z take up in the manner already described. a. During the consultation call, the work

While the button is pressed , the relay X2 contact z2 speaks the exchange line. The normally open contact 26 applies in the manner described. Contact X ₂ ¹ switches wire c 1 to earth and thus occupies, possibly via relay Y , but leaves relay Z switched on, a preselection device, a first group selector via 25 or a line selector.

-, Z, z \, X ₁ ¹ , Xo ¹ , c2, -j-. During the election, the contact s ₂ ² repeats the Im

pulse over the vein bl, which up to the reached voter

The changeover contacts y2, y3 again switch the circuit that is switched through, in the following circuit: Speech circuit of the calling subscriber through to the exchange line. When the earth button is released, the 30 - ·, Wi2, s ₂ ² , DrI, z3, /> r 4, g ₂ ³ , δ 1 wire to the relay X2 reached drops out, and the contact X ₂ ^{1 in} turn switches the selector,

the relay Z off.

As soon as the normally open contact z2 returns to its idle position, the exchange line is again held via the following in the manner already described, but with the throttle Dr2 , and it is again the normal difference that in the present case the feed bridge speech circuit established with the public subscriber. X2, S2 via the transferred contacts ^ ⁴ , g ₂ ⁵ to the In the meantime, the contact ζ 5 triggers the connection a2 [b2 (of the subscriber from which the Ausdungsemrichtungen triggers the connection via the speech channel a2jb2 releasing the connection ) lies. The ringing current was applied, whereas the contact 24 the circuits or the feed bridge Xl, Sl are on the other hand interrupts for the relays Co, F and PR , so that these 40 speech path al [bl via the relocated contacts ^ ² , g ₂ ³ . fall off. In addition, the relay S1 of the

second feed bridge brought to waste. State of the remaining public call in the usual way

If the subscriber called via the speech path α 2 [b 2 is occupied again by briefly pressing the earth button, the relay Co will hold on to be accepted.

Wire a2, because the set line selector cannot complete the 45 If a subscriber with the exchange line is in the test process and, accordingly, the connection that he or she is not assigned to the speech wires through. In this case it was shared, so he can in turn give the trunk connection to the calling subscriber who transfers another authorized subscriber by the busy signal. By pressing the earth button again he reaches the latter in consultation and prompts him, which briefly responds to relay X2 , and the 5 "earth button of his station is to be pressed. Relays Y and Z are thrown off one after the other. It is the station of the subscriber, over the speech channel

thus the exchange connection is reached in the already described aljbl in inquiry, the way is first restored. Milorophone feed over the bridge Xl, Sl.

In a similar way to a house inquiry , the relay X1 can also be used for an exchange inquiry by pressing the earth button. 55 rain. By means of the contacts X ₁ ¹ X ₁ ² Y be the relay

The subscriber wishes the off a trunk call and Gl and the relay Z and held G2, has built up, the latter to another legitimate When releasing the grounding key coincide switch place with the extension, so it first one connects the relay X and the two relay Z and G2 off again. Via call in the house with the desired subscriber, the contacts g _a ² , g ₂ ³ , the speech path a 1 / & 1 is through again. During the inquiry connection, the ⁶ °, the bridge X2, 52 is fed and the switching processes already described are performed via the contacts y 2. 3/3, which have returned to the rest position, up to

The subscriber reached via the speech path a2jb2 , trunk line ajb switched through.

can now in turn connect to the exchange line. In the meantime, the working contact z5 releases the

by pressing the earth button on his station. connection devices of the speech path a2 [b2 from where-The relays Gl and G2 depend in the same way on the 65 against the normally closed contact ^ ₁ ³ the connection devices relay Xl, as the relays Y and Z under the influence of the speech path al [bl also after dropping of relay Z of contact X ₂ ¹ or X ₁ ¹ . keeps busy. The contact z4 meanwhile had the current

While the button is pressed, the relay Xl circuit for the relays Co, F and PR is interrupted, which switches the relay Gl on and the relay Y off. The feed is switched on in the various switching states. As soon as the participant releases the earth button, 7o bridge X2, S2 connected to the speech path,

on which the subscriber is, on whom the release of the connection is dependent, while the other feed bridge Xl, Sl is connected to the speech path on which the called subscriber is located.

Claims (4)

Patent claims: 1. Circuit arrangement for telephone private branch exchanges with consultation option and relocation of exchange connections, in which the line selectors galvanically switch through the speech wires in their immediate occupancy or occupancy via intermediate dialing levels from an office transmission, with separate feed bridges being provided for the microphone feed of the branches, characterized in that two feed bridges (Sl, Xl, S2, X2) are assigned to the official transmissions and only in one of the two feed bridges (Sl, Zl) additional switching means [Co ₁ F, Pr, CH) for evaluating the end-of-dialing character transmitted via the inquiry path, the free or busy state of the called subscriber as well as for the transmission of calls are provided and that switching means (Gl, G 2) reevaluate the exchange transmissions in such a way that in the event of an inquiry and transfer of an exchange connection the feeder bridge (S1, Xl) with the additional switching means the inquiry path and the other Feed bridge (p 2, X2) is assigned to the extension to be connected to the exchange line. 2. Circuit arrangement according to claim 1, characterized in that the one feed bridge (Sl, λ'1) is connected (via contacts of the relay G2) to the local speech circuit to which a called subscriber is, and connected to this speech path for so long remains until the triggering of the switching device (transmission) becomes dependent on this subscriber or until the calling subscriber releases the connection with this subscriber. 3. Circuit arrangement according to claim 1 and 2, characterized in that the other feed bridge (S 2, X2), which does not contain any circuit elements for calling a local subscriber, is connected to the local voice circuit (via contacts of the relay G 2), on which there is a participant on whom the triggering of the switching device (transmission) is dependent, and that the same feed bridge the circuit elements for the microphone feed (S 2, X2), the recording of the dialing pulses and the transmission of the acoustic signals (S 2) as well as for contains the inclusion of the control characters for the inquiry and assignment (X2) . 4. Circuit arrangement according to one of claims 1 to 3, characterized in that the pulses received by the second feed bridge (S2, X2) are forwarded to an outwardly leading (connection or exchange line) or local speech path via a pulse equalizer. Considered publications:
German patent specifications No. 666 897, 862 027. 1 sheet of drawings © 709 808/95 11.57