DE870567C - Circuit arrangement for telephone systems with dialer operation, in which high-value and low-value connections to individual and collective lines are established via the line selector - Google Patents

Description

'Circuit arrangement for telephone systems with dialer operation, at which high- and low-value connections to individual and hunt groups are established In telephone systems with dialer operation it is known to speak to promising participants, e.g. B. the participants one with several To assign trunk lines to the private branch exchange, so-called hunt groups. With a decade voter structure, the hunt groups are usually in a decade arranged at successive steps. In this case, the line selector must to operate the hunt group that can be reached by one and the same subscriber number to be able to, according to the controlled selection by means of a special contact segment in Connection with a fourth voter arm, the so-called collective contact, in free Skip the selection and search the individual lines of the hunt group.

In the case of telephone systems where high-quality and low-quality connections, such as local and long-distance or self-dialing long-distance traffic connections, via the same line selector manufactured and the line selector in long-distance traffic, by a special circuit Rerouted, check on manned lines to get the remote clerk intruding and offering the high quality connections would enable the line voter during his free selection via the lines of the hunt group immediately on his Check the first busy line, although there are still free lines in the hunt group available. This must be prevented. For this purpose one has already in front of the Hunt group in the contact bank of the line selector has a special empty contact placed, which the line selector a criterion with the help of a chain connection mediates that all lines of the hunt group are busy, be it local or remotely occupied. This criterion only made the line voter like this reversed, that he now checked remotely on manned lines, while he was before only checked for free lines: In this case, the line selector checked- on the first busy line: Were the lines of the hunt group all remote, so the line selector ran to the last connection of the hunt group, where he was standing until the remote operator found him, after she found that this too Connection line is remotely occupied, triggered. This arrangement has the Disadvantage that you need an empty contact and the check for busy status the hunt group takes place via a voice line; which one with consideration for possible Wants to avoid disturbances of the participants.

From the patent specification 26o 491 it is already known, the lines to assign a common resistance to a hunt group, which when free a line both the local and remote checking of an occupying one Line selector permitted, however, after a line of the hunt group has been seized prevented due to the existing test circuit in an occupying line selector, that another line selector is looking parallel to the line being used checks locally or remotely on the existing connection. Remote checking is only then through the lines of the hunt group in the known arrangement Allocated relay enables when all lines of the hunt group are busy 'are. In this case, the test relays assigned to the lines close all of them Lines share resistance short, creating one in parallel with an existing one Local connection checking remote checking relay can respond. This arrangement Has the disadvantage that the number of lines in a collective connection is limited is. If there is a larger number of hunt groups, then if there are several existing connections on the collective connecting lines of the voltage drop large to ensure that the test relays work safely. Furthermore you can the selection of an office are not all uniformly trained: the selection for the lines of the hunt group you need additional resistors and batteries obtain. : Finally, the known arrangement shows a confusing circuit with many, current branches, which are particularly severe conditions on the relays place.

The invention has set itself the task of the Vorprüfkontäkt, as well the preliminary check of the hunt group via the voice lines as well as any intervention in the line selector and the selection of the hunt group `to avoid. Solved This object is achieved according to the invention in that the hunt group 'belonging first selection for your occupancy, be it in incoming or outgoing traffic, artificially against any further occupancy; especially through a remote connection, blocked will. As a result, the line selector must first always, i. H. also at. a remote connection, check for a free line in the hunt group. These Blocking is only activated by a switch-off relay, depending on a chain connection canceled when all lines of the hunt group are busy. Only now differs the line selector in that he is free, occupied or with each turning step remote checks which line of the hunt group is local or remote is: In this way it is achieved that as long as there are lines of the hunt group are free, even in the case of long-distance connections, a free line is always checked first , if all lines of the @ Sämmel connection are busy, then one after the other the busy lines can be used by the remote connections.

The figures show an embodiment of the invention. FIG. I shows a local telephone line selector LW for individual and collective connections, Fig. 2 is a circuit VS intent for the operating state of each and every selection of the manifold dependent artificial Sperreng and a first selection V W1, z. B. may be assigned to the first line ai, bi, ci of the hunt group: The last line of the hunt group is denoted by an, bn, cra. In the header circuit VS each line of the hunt group is assigned a high-resistance monitoring relay TVi to Vn and a common disconnection relay S is assigned to the entire group of lines of the hunt group. When the system is idle, all monitoring relays Vi to Vn are excited via the c-wire of the first preselector, contact yi, relay T, d-arm of the preselector. Relay S, which responds briefly when the system is switched on and opens the short circuit of the monitoring relays Vi to Via at contact s, is de-energized as long as one line of the hunt group is free and is only de-energized when all relays Vi to Vit have dropped out The detailed operation of this circuit is shown in the following description of a remote connection.

When setting up a remote connection: the remote officer assigns the line selector LW in the usual way to an upstream group selector. The occupancy relay C responds to voltage via the c wire and head contact ki. The number impulses are given as earth impulses via the a-wire and received by the surge receiving relay E. Relay E responds to the next-to-last digit of the subscriber number: Impulse series in pulses and transmits the current impulses in the following circuit to the Hul) magnet of the line selector: -f-, line WK, e i, VI, ic r, wi, H, -. In this circuit, the control relay V also responds, which has a drop-out delay due to a short circuit across its winding II. The solenoid lifts the selector arms onto those of the transferred ones. Number impulse series corresponding to the decade. After the end of the series of impulses, the delay relay Z 'drops out. Now the delay relay U responds, which reverses the pulse circuit from lifting to turning: -f-, head contact k2, c5, shaft contact w2, v5, UI, -. The next series of impulses is in turn picked up by relay E and transmitted to rotary magnet D: -I-, WK, e i, VI, at i, t3, P i, a3, D, -. The rotary magnet rotates the voter arms gradually over the decade, following the number current surges until the selected connection is reached, which in our example may be a hunt group. In the circuit of the rotary solenoid, the delay relay V responds. The reversing relay U, which was switched off after the first turn of the selector on the shaft contact w2, is held locally via contact zt2 and winding III during the rotary movement. In the case of a hunt group, after the delay relay TI has dropped after the number dialing has been completed, the delay relay M is switched on via the first step of the group contact sk, which, in conjunction with the relay U, controls the free choice of the line selector for searching the lines of the hunt group.

Assume that the hunt group has five lines, of which the first two should be busy and the remaining three free. Then there is direct blocking earth on the test leads of the two connecting lines on the first two lines due to the common relay S that has dropped out and the monitoring relay V of the first two lines in the auxiliary circuit that has also dropped out. After dialing the number, the line selector is on the first line of the hunt group. Relay U initially holds itself through contact u2 and winding III. After the delay relay V has dropped out, the relay G responds in series with relay U (winding I) via its winding I and the slow breaker LU i. This excitation circuit is interrupted again immediately at contact 93 , but relay G is maintained through its winding II: -I-, k 2, c 5, yr, G II, -3, Wi, -. When relay G responds, remote test relay T is also excited in a local circuit: -h, k2, c5, P5, i3, 95, u3, e2, TI, -. The holding circuit of relay LT is opened at contact gi, relay U drops out. During the release time of the relay U, the location test relay P with its winding I is connected to the c7Arm of the line selector. "Since the first line of the hunt group is occupied, as assumed, and its c-wire is artificially remote-blocked in the auxiliary circuit VS, the test relay P in the line selector cannot pick up. After the relay U drops out, the relay T drops out, because its locally excited winding I is switched off at contact U3 and winding III of relay T, which is placed on the test arm of the line selector via contacts u2, t i, cannot hold either because it is directly earthed in the auxiliary circuit After the relay T has dropped, a new circuit for the rotary solenoid of the line selector is closed: -I-, WK, mi, t4, u3, PI; a3, D, -. The rotary solenoid responds and switches the selector by one When the rotary solenoid responds, relay U is again excited via rotary contact D. Relay U interrupts the circuit of the rotary solenoid at contact U3, this drops out The remote test relay T is locally excited again via its winding I. Relay U is switched off again depending on the rotary magnet. During the release time of the relay U, the local test relay P is again connected to the cArm of the line selector, and then the winding III of the remote test relay T is again applied to the test arm. However, since the second line of the hunt group should also be busy according to the assumption, neither of the two test relays can yet respond. This game continues until the electoral arms find a free line. In this example, this is the third line of the hunt group. If the location test relay P is connected to the c-wire during the release time of the relay U, the relay responds.

It should be made up for here that in long-distance traffic following the first A series of numbered bursts sent by the remote station is a remote criterion in the form an alternating current or increased voltage pulse of a certain polarity over the b-wire is given to the line selector, which during the release time of the delay relay V energizes relay J (winding I) via contact v4. Relay J maintains contact i 3 and its winding II locally.

; In addition to the test relay P of the line selector LW , the test relay T i of the first preselector also responds in the test circuit. The latter activates the two speech lines in a known manner.

In the auxiliary circuit VS, the high-resistance monitoring relay TVi lying parallel to the low-resistance test relay P comes off. Relay 1'i closes its contact z, i and thereby places direct earth on the c wire to the line selector. In this way, the connection line of the hunt group is blocked against any further assignment, including a remote connection. , This blocking earth also short-circuits the winding of the test relay P in the line selector on the c-core. Relay P however holds locally: -f-, P II, P3, Ph I, c5, D, -. The rotary magnet D does not respond in this circuit, but the relay Ph is energized in series with the relay P. After switching the contact P 5, the relays J and T hold in the following circuit: -I-, k: 2, c5, P5, T II, t2, JII, -. After it has responded, the local testing relay P applies blocking earth to the test wire via contact P 3 and the low resistance Wi i, which in the present example of a remote connection is replaced by direct blocking earth via contact i 5. After checking the line selector, the winding II of the relay E is switched on during the release time of the relay U via the slow breaker LU2: -l-, LU2, UII, zt4, EII, N3, P i, a.3. D, -. Relay E applies the first ringing current to the line via its contact e 3: After falling ides relay U, a periodic call, e.g. B. io-second call, applied to the selected line. The ringing current runs through the two windings of the feed bridge relay A in the line selector and the alarm clock at the subscriber. As soon as the subscriber picks up his receiver, the DC loop for the feed bridge relay in the line selector is closed, relay A responds and initially switches off ringing relay E at contact a 3. Furthermore, the speech wires b are switched through at the contacts a 5 and a i. After energization of the feed bridge relay A, the counter relay Z of the line selector is energized locally via the collective contact: -I-, sk, v 3, MI, ZI, Wi, - because the winding I of the relay Z on the c wire as a result the remote blocking .the c-core cannot be energized.

The voice connection is now through, and the conversation can take place.

Let us now consider the case that no line of the hunt group is free any more. In this case, all monitoring relays Vi to Vn in the auxiliary circuit, S have dropped out. As a result, relay S is switched on via the daisy chain connection of the contacts of the monitoring relays. Relay S -switches: the direct "blocking earth" at the contact of all c-cores of the hunt group lines. The state of the c-cores of the hunt group is then such that in the incoming local traffic -in the line selector either blocking earth via a low resistance or in the incoming long-distance traffic direct [blocking earth is connected to contact i 5. In outgoing local traffic there is no potential at all on the c-wires, since the call relay R i of the preselector is de-energized and the selector is turned out of the zero position; energized again, and in this case there is direct blocking earth on the c wire via contact ri.-It is now assumed, for example, that the first line of the hunt group ai, bi, e i is occupied. In this case, the location testing relay P Do not respond in the line selector LW The officer receives a busy signal via winding III of relay E, from which it is inductively transferred to winding I of relay E. will wear. After the fall of the relay U, the low-resistance winding IIT of the relay T is again on the contacts t I, u2, ph 5, c.9, k: 2, -i- on the test arm of the line selector. After relay U has dropped out, the local excitation winding I of relay T is switched off. If the selected connection, as assumed, is occupied, the relay T remains parallel to the. low resistance of the other line selector in the multiple circuit in the test circuit or locally via Wi7oo. t4, 2c3, p i, u3, D, -. The voter remains on this line because on the one hand relay M is short-circuited via the contacts u 5, Lind: t 5 and drops, on the other hand the circuit for the rotary magnet at contact t4 is interrupted. The long-distance officer now gives a connection impulse via the a-wire, which energizes the relay E in the line selector. By opening the contact e 5, the hold circuit of the relay I is interrupted. Relay T drops out. Now the relays Y and U are excited in the following .Stromkreis: -I-; k 2, c 5, p 5, i, 3, Y, T III, t 6, ph i, ci; to 2, v 5, UI, -. When contact yi is opened, the hold circuit of relay G is interrupted, relay G drops out. This deactivates the busy signal and contacts y 3; g 5, ph 5, Dy, E III ticker signals are given to the officer and to the existing local connection. The voice lines are via the contacts y4 and y5 and the small voice capacitors C3 and C4. switched through. The remote officer can now offer the remote connection to the station-occupied subscriber. The local test relay P is connected to the test wire in preparation via its winding I and contact yi. If the called subscriber wants to take over the long-distance call, both subscribers of the existing local call must hang up their receivers. The test relay P. Of the line selector then picks up in the test circuit. During the release time of the relay U, after the relay P has responded, the winding II of the relay E is connected to the low-speed interrupter LUz and the first call is thereby switched on. After the relay U has dropped out, the next call is made via an io-second switch. -This is switched off as soon as the called subscriber; removes his handset, thereby producing the line loop, .in which the line selector LW the feed bridge relay A attracts. After the relay T responded, the auxiliary relay PH was also switched on again locally in series with the winding II of the relay P. Likewise, after the relay P has responded via the contacts p 5, t 2, the relay T is switched on again, which remotely blocks the called connection line.

If the called connection line is remotely occupied, the relay T, whose winding III is testing the e-wire, cannot hold itself. It drops out because it is short-circuited directly across the c @ wire. The consequence of this is that the activation impulse which the remote official sends out in response to the busy signal excites the relay E, but the relay T does not fall as a result. This prevents the intrusion. The ticker symbol is also not switched on. The busy signal remains until the remote operator clears the connection. When triggered, the occupancy relay C in the line selector LW drops out, which in turn switches on the relay M. Relay M, in conjunction with relay U, causes the selector arms to rotate until the end of the decade, whereupon the arms fall down and are brought back into the zero position in a known manner Save v and s on the last line of the hunt group because it is irrelevant here whether the line is occupied locally or remotely. This removal of the blocking earth has the advantage that the test relay T of the first preselector of this connection line is not energized and thus blocked after an occupancy by -the direct earth via the closed contacts s and v of the auxiliary circuit, as was the case with the previous first preselectors of the collective connection lines.

In order to avoid the blocking of the test relay T with the remaining first preselectors of the collective line, the cut-off relay S is expediently provided with a further winding II, which has a timer, e.g. Bi. Io a second switch, is energized briefly at periodic intervals, the contact of the attachment circuit, the locking end temporarily takes away and thereby on the one hand the relay T, on the other hand, the monitoring relays V brings in the Vorwählern to the waste to respond.

Failure to perform artificial remote blocking on the last line the hunt group on the other hand has the advantage that the counting relay Z reads the line selector can now be excited via its winding I and the test wire. This is why required because the collective contact sk on the last step of the hunt group is already open and relay Z can therefore no longer be locally excited.

In night traffic, the hunt group is to be disabled in the case of secondary systems and a specific subscriber of the hunt group is to be reached by the so-called night number. For this purpose, on the one hand, the free selection after dialing the number must be prevented in the line selector LW. This is achieved with the help of the second arm sk z of the collective connection contact. This arm already comes to a tooth of the contact segment of the hunt group when dialing the number, so that after the delay relay V has dropped after dialing the number, the winding I of the relay M is short-circuited, whereby the initiation of the free choice of the line selector is prevented. On the other hand, the artificial blocking must be avoided in the prefix VS, so that the night subscriber can be reached in any case. For this purpose, for example, any connecting line is provided with a feed bridge consisting of the chokes Dr i, Dr a, capacitor C 5, at the center of which a further winding III of the cut-off relay S is connected. In the private branch exchange, the connection line is also provided with a bridge Dr3, C6, Drq. provided, at the middle of which is applied by the night button NT earth, so that the cut-off relay S in the auxiliary circuit responds via the b-wire and the artificial blocking of the c-wires cancels.

Claims (1)

PATENT CLAIMS: i. Circuit arrangement for telephone systems with line selectors for individual and collective lines; In which, when a line of the hunt group is occupied, it is initially blocked against any further occupancy, in particular by high-quality connections, and the block against high-quality connections is lifted when all lines of the hunt group are occupied, characterized in that switching means ( Tli to Vn) when a free line of the hunt group is occupied, block it by connecting blocking potential in the subscriber circuit against occupancy by further local or remote connections, but automatically cancel this blocking again when all lines of the hunt group are occupied, so that only those of the respective existing connection (local or long-distance connection) corresponding (blocking is effective. a. Circuit arrangement for telephone systems with dialer operation according to claim i, characterized in that switching means (J, UP, T) are assigned to the line selectors d, which in the case of high-quality connections automatically check the selected lines one after the other for free, local and remote status. 3. Circuit arrangement for telephone systems with dialer operation according to claim i, characterized in that each line of the hunt group is assigned a monitoring relay (Tli to Vn) which, in the unoccupied state of the preselector assigned to this line, cancels the provisional blocking of the test wire and when the preselector is occupied, this iBlocking is activated. q .. Circuit arrangement for telephone systems with dialer operation according to Claim 3, characterized in that the monitoring relays are controlled via the test wire running between the line selector and the preselector. Circuit arrangement for telephone systems with dialer operation according to claims 1 and 3, characterized in that the monitoring relays individually assigned to the lines of the collective connection bring a relay (S) jointly assigned to the collective connection into effect when all preselectors of the collective connection are occupied via a chain connection of their contacts Artificial; the blocking of all test leads of the hunt group lifts. 6. Circuit arrangement for telephone systems with dialer operation according to claim i and 3, characterized in -that the lifting of the artificial blocking when all preselection of the hunt group is occupied is carried out directly via a chain connection of the contacts of the monitoring relay. 7. Circuit arrangement for telephone systems with dialer operation according to claim 5, characterized in that the cut-off relay (S) is provided with a further winding which, by -a time switch after certain intervals (periodically) -is switched on briefly and the blocking of the Prizfrelais (T) the preselector and the monitoring relay of the collective connection, which occurs after a preselector has been assigned due to the artificial blocking of the test leads. -8th. Circuit arrangement for telephone systems with dialer operation according to (Claim 5, characterized in that one line of the collective connection is provided with a feed bridge (Dr i, Dr2, C.9) via which - in night traffic by a switching measure at the subscriber station - a further winding - of the cut-off relay @ (S) common to the hunt group is brought into effect, which removes the artificial blocking of the test wires of the bread connection:. Circuit arrangement for telephone systems - with dialer operation - according to claim i, characterized in that the artificial blocking of the lines during night traffic of the hunt group; is canceled by a switching measure in the public office. io. circuit arrangement for telephone systems with dialer operation according to claim 1, 5 or 6, characterized in that the artificial blocking of the test wire on the last line of the hunt group is eliminated. ri. circuit arrangement for telephone systems with dialer operation according to An Claim io, characterized in that the metering relay (Z) of the line selector is activated locally via the collective contact (sk) when the last line of the: hunt group is occupied, the test wire, when the other lines of the hunt group are occupied. Cited publications: German patent specifications No. 536 2a3, 269 494 6ö2 925 , 28.4 509.