DE1070689B - Circuit arrangement for telephone branch exchange systems for the direct connection of a branch marked as a main branch to an exchange line in the event of failure of the local power supply - Google Patents

Description

Test substance class 21a3 FEDERAL REPUBLIC OF GERMANY

GERMAN mmm < PATENT OFFICE

kl. 21 a ³ 54/01

INTERNAT. KL. 04 w

EDITORIAL 1 070 689

Φ κ 4 'y ~ ^s 61 D29467VIIIa / 21a ³

A N M E L D E T A G: NOVEMBER 28, 1958

NOTICE
DEK REGISTRATION
AND ISSUE OF THE
EDITORIAL: DECEMBER 10, 1959

The invention relates to a circuit arrangement for telephone private branch exchanges for direct Connection of an extension switched as the main unit to an exchange line in the event of failure of the local one Power supply (mains supply) for the private branch exchange.

The subject of the main patent application is in particular such a private branch exchange in which a number of preferred extensions using of switching devices that can be set manually or by current impulses, optionally the function can be assigned as the main body. This is also the case in such systems in the event of a failure of the local power supply The maintenance of communication with the office is to be ensured in the main patent application a circuit arrangement is placed under protection in which the optional one of a plurality of auxiliary units as the main unit if the mains supply fails and the internal exchange switching facility is switched off, the Connect the extension selected as the main unit directly to the or an exchange line.

The communication between the office and the changeable main office is thus perfectly regulated. The arrangement has a shortcoming, which is that if an extension to the Belongs to the group of preferred extensions that can be switched as the main unit, but not the main unit at the moment is, an outside call is being made, this is interrupted in the event of a network failure, -the subscriber may therefore under certain circumstances cannot receive or forward important communications.

The arrangement according to the present invention aims to eliminate this disadvantage by making it possible to make an outside call on the part of preferred extensions with To continue power failure without interruption and to bring it to an end, which is achieved by the Switching means used for main switching in the event of a power failure and an exchange connection on the part - one extension that is not switched as the main unit can be influenced in such a way that the previous one is canceled Main unit setting this extension is switched as the main unit for the duration of the exchange connection and after the exchange connection, the original master unit setting is restored.

In the drawing, an embodiment of the subject invention is shown. Not all of them necessarily Switching elements and circuit arrangements necessary for its understanding are for simplicity and for the sake of clarity have been omitted.

On the left in the drawing, extensions JV1 to JV6 are shown that are authorized or designated for it Circuit arrangement for telephone private branch exchanges

for the immediate connection of a designated main unit

Extension to an exchange line if the local power supply fails

Addition to patent application D 29202 VIIIa / 21a ³ {Auslegeschrift 1 067 077)

Applicant:

German Telephony Works

and Kabelindustrie Aktiengesellschaft,

Berlin SO36, Zeughofstr. 4-11

Harry Loewen, Berlin,

and Christian Lettfe, Berlin-Lichtenrade,

have been named as inventors

are, if necessary, the activity as the main office (Night job) to exercise. It is already known that

To make assignment of the function as main unit dependent on the setting of a dialing facility. This is done either with the help of buttons or other manually operated setting devices or with the help of a switching device,

which is remotely set by power surges sent by the responsible bodies. A well-known arrangement of this type (see German Auslegeschrift 1 023 492) uses a relay selector consisting of latching relays, the links of which depend on the choice of the

extension desired as main unit. _ be operated in different numbers and combinations. and remain actuated without power consumption until a demagnetization process takes effect. This way the connecting organs are chosen

Extension set in such a state that incoming exchange connections only to this subscriber get, which in turn the exchange connection in the inquiry and transfer procedure to other participants can forward.

. 909 688/95

In the right part of the drawing the relays £ 1 to £ 3 of the relay selector are shown with different windings. It is not shown how the relay group is influenced in detail by transmitted number current impulses and the switching of the desired extension as a night station. There are two contact groups of these relays shown, namely at the bottom left 35 el and 36el, 31 e2 to 34e 2, 27e3 to 3Oe3, over which the

turns on the house sentence HS. The subscriber receives the dialing signal from the house record, whereupon the connection to a desired house subscriber can be established by sending a number of bursts of current.

For the purpose of establishing an exchange connection, the extension JV1 actuates the earth button TV after lifting the receiver, whereby a differential relay is influenced in the house set, which the holding circuit

When the relay Tl is switched off, the extension switched as the main unit disconnects, so that the contacts IiI fall directly to the exchange line, and 2il fall back into the rest position. Re-Kontaktgruppe41 el, 42e2, 43 e2, 44e3, 50e3, via lais Ul , which by closing the make contacts, the old state of the main switch speaks about the direct earth shown by and the button T Γ above in the middle of the drawing 15 μ 1 and 16 M1 the subscriber Λ ^Γ 1 is restored to the office. Others through the relay selector 15 through transmission AU . The following switching processes are caused in the main circuit: Patent application dealt with.

As can be easily seen from the drawing, the individual extensions are controlled by the relay selector marked as follows:

Extension N 1: none of the relays E 1 to £ 3 in working position;

Extension JV 2 : Relay E 1 in working position; Extension JV 3: Relay £ 2 in working position;

+, Z (II), 5 "(1I), 16Ml, An (in dashed working position), participant loop, Zn (in dashed working position), 15μ 1, Z (I), 5 (I), -.

Extension JV4: Relays E 1 and E 2 in working position;

Extension JV 5: Relay £ 3 in working position; Extension JV 6: Relays £ 1 and £ 3 in working position. . ■.

The relay 6 ″ of the trunk transmission responds, while the relay Z, which is used for signaling and query depending on the actuation of the key T1, does not respond. Relay S is a pulse and feed relay, with the help of which the series of current impulses required to set up the trunk connection are established be transferred to the trunk line AL reached via the trunk transfer AU .

After relay 5 ¹ has responded, the following holding circuit is established for through- switch relay U 1 of extension A ^{r 1:}

+, 75 s, 76 nz (in dashed working days), An, 68wl, Ul (Il), -.

The state of the local power supply to the
PBX is monitored and identified by the relay JV, not shown here,
JYl, JV2 (in the publication of the main patent application, these relays and their influences are described
shows) and by the relay NZ shown here. All
these four relays are active when the mains supply is not disturbed
energized in closed-circuit circuits in the event of a network failure
fallen off. Contacts 3 »to 6n, 7nl to 1Ow 1
and Ilw2 to 14w2 are thus operated during operation 40 g ^en and with the help of the earth buttons T2 'to T6' official readiness of the local power supply, make connections in the manner described, so that the branches JVl to N 6 shown before is then switched on via one of the preparatory to individual subscriber relays (T / U), e.g. contacts 69 u 2, 70u3, 71 μ 4, 72w5, 73m6, a hold / l, Tl. Circuit for that of the calling extension

If the mains voltage is present, switch relays (U2 to U6) assigned to the fol- lowing 45 are produced, the capacitors are charged or charged. It is assumed that the extension JV4 has the

keep:

In this circuit, the relay AN also responds, which switches on with contact 77 on the relay JVZ via its winding III.

In the same way as the extension JVl, the extensions JV2 to. ¥ 6 can make internal connections.

1. Capacitor Co 1: charged via contact 56 nz (in dashed working position);

2. Capacitor Co 2 : charged via contact 62 nz (in dashed working position);

3. Capacitor Co 3: charged via contact 74 nz (in dashed working position);

4. Capacitor Co 4: charged via contact 66 nz and break contact 67 ny (in dashed working ⁵ ^

Function as main unit is assigned, ie that after corresponding influencing of the relay selector, the relays El and £ 2 are in the working position. Incoming office connections now only get to the extension Λ ^Γ 4, - A criterion is given from the incoming exchange line through which, as explained in more detail in the publication of the main patent application, only the [/ relay as the main shaft via another contact group of the relay selector set extension, in this case the relay U 4, switched on via its winding II. The system is in a proper state. Via the contacts 21 u 4 and 22 w 4 the least one extension is removed for the purpose of the connection extension JV4 for exchange transfer AÜ by producing the handset, so if 6o is switched, so that ringing current from the exchange line to this is, for example, the extension JV1 , following extension JV4 arrives. ■ ■

If the mains supply of the private branch exchange fails, the holding circuits of the relays (JV, JVl, JV2) and the circuit for relay NZ are canceled, as already mentioned. All contacts of these relays thus fall into the rest position. The contacts Zn up to 6 «, 7« 1 to 1OmI and 11 «2 to 14m2 switch off the exchange transmission from the extensions. Only the connection line of the secondary unit switched as the night

circuit made:

+, Tl, 2f 1, 16 «Ι, 4w (in dashed working position), JV1, Zn (in dashed working position), 15« 1, IiI, Ul (I), -.

In this circuit, the relay Ul has fault current, so that only relay Tl responds, which is in a holding circuit, not shown, and through Um

place the contacts IiI and 2il in the working position 70, place JV4 is above the one shown below on the left

Contact pyramid of the relay selector preparatory by bypassing the transmission A Ü directly connected to the exchange line "AL and thus with the exchange power supply:

Connection line of the extension N 4, 9m1, 10 m 1, 32 e 2, 34 e2, 35 el, 36el, ATZ (I ₁ II), AL.

Despite the failure of the mains supply, the extension switched as the main unit is the outgoing one and enables incoming traffic with the office. All other extensions can while do not communicate with the office for the duration of the failure of the mains supply.

If the current in the private branch exchange is restored, the relays (N, ΝΪ, N2) and NZ are again brought into the working state that enables normal operation, which, as far as the relays (N, Nl, N2) are concerned, not here is shown in detail, but the publication of the main patent application provides information on this.

In the arrangement of the main patent application, as already mentioned, an extension that is not switched as the main station is switched off from the exchange transmission in the event of a power failure, so that it is not possible for the extension subscriber to complete the exchange call that has been started. This shortcoming has now been remedied as explained below. It is assumed that, as before, the extension Af 4 is set as the main station and the extension N2 is in an outside call. As before, the relay El and are located in the relay selector to identify the extension A ^ 4. E2 in working position. Furthermore, the individual relay U2 of the extension AT2 is energized, which is in the following holding circuit:

+, 75s, 76ns (dashed working position), AN, 69u2, U2 (11), -. ■

The energized in this circuit relay AN had switched on by closing the contact 77 to the winding III of the relay NX . As a result, the capacitor Co 7 has been charged in the following circuit and is kept charged during the exchange connection:

+, 38 nz (dashed working position), 4Om ^, 39 eb. 41 el, 43 e 2, 47 mx, Co7, -.

If the mains voltage fails in this state, the relays NZ (N _1, N1 and Af 2) go into the rest position, as already mentioned. Contact 38ns disconnects the earth from the contact group of the relay selector shown in the drawing above, in order to prevent unwanted charging of the capacitors Co 5 to Co 9 during the switchings in the relay selector that follow now and after the call has ended. The extension N2 is separated from the exchange transmission AÜ via the contacts 5 η and 6 η . Current no longer flows in the holding circuit for winding II of relay i / 2. The drop in relay U 2, like the other [/ relays in and of themselves designed as a delay relay, is further delayed by discharging the capacitor Co 3:

Co 3, 74M ^ AN, 69u2, t / 2 (II), ring main, Co 3.

the charged capacitor Co 2 is placed in the following circuit:

Co2, 62nz, HN, 63n.v, A windingsII of the relay group E1 / E2 / E3, ring line, Co2.

The Kondensatorentladestoß causes an opposite magnetization of the relay group, so that the operated relay, so the relay El and E2, thrown into the rest position in this case. In each of

ίο contact groups of the relay selector, the identification of the extension A ^T 4 as the main unit is canceled. In order to prevent the trunk line from being triggered while the relay selector is being switched, a bridge (Wi, 38nx, 39 ny, 37 nz) is placed between the speech wires immediately after a power failure (relay N ^ Z drops out). Relay NX, - which, as a delay relay, bridges the contact reversal time (from opening contact 77an to closing contact 37 nz) , remains excited via windings I and II in the speech wires. By relay JiW, which is briefly excited in the aforementioned demagnetization circuit, the charged capacitor CoI via the still

. closed contact 57 μ 2 to the winding I des Relay-El laid:

CoI, 56 nz, 55am, NY (J), 57 u2, £ 1 (I) / ring main, CaI.

Relay Elin working days is the identifier for the extension N 2, which is thus set as the main station for the duration of the exchange connection. From the Koritakt group of the relay selector shown at the bottom left in the drawing, the contacts 35el and 36 el are now in the working position, all the others in the rest position. The extension N 2 is connected directly to the exchange line AL to the exchange line via normally open contacts 35 e 1/36 el and normally closed contacts 32 e2 / 34 e 2, 28 e 3 / 3Oe 3, 5 n / 6 η , bypassing the exchange transmission AU . Through the sticky relay NY, which was also started by the discharge of the capacitor CoI, the contact 39 ny is opened in the bridge between the speech wires, so that after looping via extension N2 the exchange call can be continued without noticeable disturbance or interruption. Relay ΝΎ as a latching relay remains in the working position until the exchange call is ended. It separates (in addition to the contact 38 ns) at another point (40 ny) earth from the contact group of the relay selector shown in the drawing above.

The arrangement is made so that after termination of the exchange connection, the setting of the extension N 2 as the main station is reversed and the original status (switching of the extension AT 4 as the main station) is restored.

If the exchange call is ended by extension -N2 while there is no mains voltage, the relay NX drops out after the receiver has been replaced and the loop is interrupted. When the capacitor Co 4 is discharged, a counter-magnetization pulse is applied to the relay group El to E 3 (windings II), which causes the relay El, which is in the working position, to be thrown into the rest position:

Co4, 66w.z, 65ny, 64mm, NN, 63nx, relay group El to £ 3, ring line, Co4.

In the contact groups of the relay selector, the switchover (reset and new with the identification of the extension N 2 as the main setting) of the relay selector is thus obtained, as is the same, reversed. Is described in the named unloader. Through the normally closed contact 62nz 70 circuit, the relay AW also responds, namely

with some delay, the purpose of which is to avoid overlapping during the switching of the relays of the relay group. After the relay NN has responded, the charged capacitor Co 7 (of the capacitors Co 5 to Co 9, the capacitor Co 7 was the only one that was charged via the contact group circuit of the relay selector) is connected to the windings III of the relays £ 1 and £ 2:

Co 7, 47 nx, 52 nn, parallel windings III of the relays £ 1 and £ 2, ring line, Co 7.

The relay El and E2 are started, so that by the relay voters the extension N is 4, as originally identified as the main controller. Due to the discharge pulse of the capacitor Co 4, the winding II of the relay NY , which is the opposite winding to winding I, is excited after contact 64 nn has opened. The relay NY thus drops out.

If the mains voltage returns while the extension N2 is still conducting the exchange call, the relay NZ is energized (the ground connection through contact 38 ns is ineffective here, since contact 40 My is open until after the call is terminated), and, as in the Document of the main patent application set out in detail, the relay U of the corresponding extension, in this case the relay U 2, and then the relays (N, Nl and N 2). switched on. The speaking subscriber N2 is connected to the exchange transmission AÜ through the contacts 5 m / 6 μ (both in the dashed working position) and working contacts 17 μ 2/18 μ 2, which restores the normal state of the exchange connection with the possibility of consultation, transfer and takeover . The relay NX remains, since relay AN responds when the mains voltage reappears, held via its winding III. The main switch in favor of the extension N 2 remains in effect until the exchange call is terminated. After the exchange call has ended (relay S drops out), relay NX drops out after ON , so that a counter magnetization pulse on relay groups £ 1 to £ 3 takes effect as follows by discharging capacitor Co 4:

Co4, 66ns, 67ny (relay NY as latching relay in, working position), 64mm, NN, 63nx, relay group £ 1 to £ 3, ring line, Co 4.

The relay £ 1 is thus brought to the rest position. After the relay NN has responded in the circuit just mentioned, the relays £ 1 and £ 2 are switched on by discharging the capacitor Co 7 , as a result of which the original state of the main unit circuit is restored in favor of the extension unit N 4. During this process, the relay NY is brought to the rest position by counter magnetization, as before.

For the 'other extensions with the same main switch circuit there are analogous processes. If the network fails while the extension N 1 is in an exchange connection, so will. the main switch that was in effect up to that point was reversed in the manner described. All elements of the relay selector remain in the rest position, which means that the extension Λ ^τ 1 is identified as the main unit. It is brought into direct connection with the exchange line AL via the contacts of the contact group shown below on the left (all contacts in the rest position) and rest contacts 3 m / 4 μ. After the exchange connection has been terminated, the original main unit circuit is restored by switching on relays £ 1 and £ 2 in the manner described. If the extension N 3 is in an exchange connection (relay U3 energized), in the event of a power failure and after relays £ 1 and £ 2 have been reset, relay £ 2 will be triggered via contact 58 u 3 alone. Relay £ 2 energized, identifies extension N 3 as the main unit. It is brought into direct connection with ίο of the exchange line via normally closed contacts 7M1 / 8M1 and normally open contacts 31 ^ 2 and 33 e 2.

If extension iV 5 is in an external call (relay! 75 energized), relay £ 3 is triggered via contacts 60 and 5 in the event of a power failure and after relays £ 1 and £ 2 have been reset. This means that the extension Λ ^Γ 5 is identified as the main unit. It is connected directly to the exchange line via normally closed contacts Un2 / 12n2 and normally open contacts 27 e 3 and 29 e 3.

If the extension N6 is in an exchange connection (relay U6 energized), relays £ 1 and £ 3 are activated via contacts 61 and 6 in the event of a power failure and after relays £ 1 and £ 2 have been reset. This means that the extension Λ ⁷ "6 is identified as the main unit. It is brought into direct connection with the exchange line via normally closed contacts 13 M2 / 14 η2 and normally open contacts 28 e 3, 3Oe 3 and 35 <? 1, 36 <? 1.

As already mentioned, the capacitors Co 5 to Co 9 only ever charge the capacitor that is assigned to the auxiliary unit originally switched as the main unit (for auxiliary unit N 4, the capacitor Co 7). Only the extension N1 does not have a capacitor, which is also not necessary, since this extension is identified as the main unit by the rest position of all elements of the relay selector. If extension N 2 is the main unit (relay £ 1 in working position), when the external line is occupied (relay NX switched on) the capacitor Co 5 ■ is charged via normally open contact 41 e 1, normally closed contacts 43 e2, 44 e3 and normally open contact 45 nx . If, in the event of a power failure and after the call has been terminated, the night station switching changed in favor of the extension in the exchange connection is reversed, the discharge of the capacitor Co 5 triggers the relay E1 (winding I) via normally closed contact 45 nx and normally open contact 50 mm. This means that the extension N2 is switched back as the main unit.

If the extension A ^T 3 is switched as the main unit (relay £ 2 in the working position), the capacitor Co 6 is charged via working contacts 46 nx, 42 e2 and break contact 41έ? 1 when the exchange line is occupied. After the termination of an existing one in the event of a power failure. The exchange connection is the charge of the capacitor Co 6 via normally closed contact 46 nx and normally open contact 51 nn to the relay £ 2 (winding · I) from-55. given, so that the extension N 3 is switched back as the main unit.

If the extension N 5 is the main unit (relay £ 3 in working position), the capacitor Co 8 is charged via working contacts 48 nx, 50έ? 3 and normally closed contacts 42 e 2, 41 el when the external line is occupied. After the termination of an exchange connection existing in the event of a power failure, the charge of the capacitor Co 8 is transferred to the relay £ 3 (winding I) via the normally closed contact 48m "y and normally open contact 53 mm, so that the extension NS is switched back as the main unit.

Is the. Extension N 6 main unit (relays £ 1 and

£ 3 in working position), the capacitor Co 9 is activated when the external line is occupied via normally open contacts 49mji ;, 44 e3, normally closed contact 43 e 2, normally open contact 41 e 1

charged. After termination of an exchange connection in the event of a power failure, the charging of the capacitor Co 9 is transferred to the relays £ 1 (winding IV) and £ 3 (winding III) via the normally closed contact 49 nx and normally open contact 54 nn , so that the extension N 6 is switched back as the main unit is.

The contact eb shown in the drawing above is actuated when the basic circuit for determining the main unit is to be changed. Characterized the ring line is turned on and (Co to 9 Co 5) discharge of the previously connected as a master station via a contact extension of the auditory canal in this \ ⁷ 'also turned-on relay NX of the capacitor.

Claims (9)

Patent claims: 1. Circuit arrangement for telephone extension systems for the direct connection of an extension switched as a main station to an exchange line in the event of failure of the local power supply (mains supply) of the private branch exchange by the switching means effecting the main station identification according to patent application D 29202 VIII a / 21 a ³ , characterized in that the main station circuit used switching means (£ 1 to £ 3) in the event of a power failure and an exchange connection on the part of an extension not switched as the main unit can be influenced in such a way that this extension is switched as the main unit for the duration of the exchange connection and the original main unit setting is restored after the exchange connection will. 2. Circuit arrangement according to claim 1, characterized in that by the power failure characterizing switching means (NZ) the elements (£ 1 to £ 3) of a relay group operated for the purpose of identifying a particular extension as the main unit are switched off and immediately thereafter the individual connecting means (U ) of the extension in the external call that is switched on in preparation and that identifies it as the main unit of the relay group. 3. Circuit arrangement according to claim 2, characterized in that the individual connection means (U) of the extension located in the exchange call are delayed in the event of a power failure by discharging a capacitor (Co 3) in the waste. 4. Circuit arrangement according to claim 2, characterized in that the provision of the previously switched on members of the relay group (.El to £ 3) by one from the discharge of one Capacitor (Co 4) obtained counter magnetization pulse is brought about. 5. Circuit arrangement according to claim 2, characterized in that the activation of the the change of the main unit circuit bringing about members of the relay group by a obtained from the discharge of a capacitor (CoI) Actuating pulse is brought about. 6. A circuit arrangement according to claim 1, characterized in that in the event of a power failure during an exchange call, which leads an extension not switched as the main station, the extension previously switched as the main station individual switching means (Co 5 to Co 9) after termination of the exchange connection for the purpose of resetting the main station circuit in the original state take effect. 7. Circuit arrangement according to claims, characterized in that during the existence of an exchange connection a capacitor (z. B. Co 7) which was originally connected as the main unit is charged or kept charged, which after termination of an exchange connection with a power failure by its discharge switches on the individual members of the relay group assigned to the main unit (e.g. E1 / E2). 8. Circuit arrangement according to claim 6, characterized in that the individual branches Capacitors act only on the members of the relay group through which the associated Subsidiaries can be identified as main units. 9. Circuit arrangement according to claim 2 and 6, characterized in that during the switchings (readjustment, resetting) of the members of the relay group (£ 1 to £ 3) processes (by relays HN, NN) are controlled through which the switchings are chronologically ordered . 1 sheet of drawings © 909 688/95 12. 59-