DE965940C - Circuit arrangement for telephone extension systems with the toll counters assigned to the trunk lines - Google Patents

Description

ISSUED JUNE 27, 1957

S 38811 Villa μια *

Rudolf Kraust, Munich has been named as the inventor

For private branch exchanges, it is known to assign billing meters to the trunk lines, that transmitted by over the trunk line, preferably with an overtone-frequency alternating current Counting pulses are incremented. Registered with some of the known arrangements jödier meter all over the sumimairisch respective trunk incoming counting pulses, while in other known arrangements only the incoming counting pulses for high-quality connections are counted.

In the case of the last-mentioned orders, reading of the fees by the civil servant is particularly easy if fee counters with reset are used. After the termination of a high-quality connection, only the charges incurred for this are accrued on the meter, since the. Charges for low-order connections established between two high-quality connections are not counted. %O

In a known arrangement, the influencing of the billing meter due to the counting pulses for low-order connections Avoided that the circuit of the billing meter is dependent on an only after Her- «5 setting a high-quality connection switched on by a remote-authorized subscriber Relay stands. To switch on this remote authorization relay, each participant who is entitled to establish high-quality connections

709 562/75

build, special identification switching devices are assigned. The circuit of the billing meter however, it is still dependent on a relay that is switched on when the exchange line is occupied. This ensures that incoming counting pulses have no effect if the trunk transmission is not in use stay. In the known arrangement, two relays are used to prevent one unwanted influencing of the fee meter is required.

In another known arrangement in which the production of high quality compounds also takes place without involving the Vermittlungsbeamtm of the participants from, each sub ¹ S assigned to a slave attached to the switching center Besetztl'ampe, dienaah completion of a high-quality connection and after identification by the subsidiary officer flickers. At the same time as the subscriber lamp flickers a lamp assigned to the counter on which the charges for the terminated connection were registered. Such arrangements require a relatively large amount of switching means for identifying subscribers, which does not appear to be worthwhile in the case of smaller private branch exchanges in particular. Another disadvantage of this arrangement is that the subscriber or the subscriber circuit must be kept busy even after the call has ended until the charges have been read.

The invention relates in particular to Heinere private branch exchanges in which all high quality Connections are mediated by the extension officer, and also aims in such systems influence the charge meter by the low-order connections to prevent incoming charge pulses with the least amount of switching means. The invention aims furthermore, the signaling of the individual states of the transfer of offices in the simplest possible way Way to enable. This is achieved by two when the first counting pulse arrives relays operating during the existence of a high-quality connection, of which the first relay only effective during the existence of a high-quality connection in the circuit for the one that can only be influenced by the counting pulses arriving at high-quality connections Charge counter mastered, the second up to the release initiated by the extension officer the ·· trunk transmission, the relay that controls the lower-order connections when the lower-order connections are terminated prevents the automatic release of the transfer causing the switching means and both relays a monitoring lamp in different, the respective connection state do not influence the drawing.

The invention makes it possible to identify each state of the exchange transmission with just two relays. The first relay that is switched on when counting pulses are received during an existing connection indicates the status of an existing high-quality connection. It is switched off after the connection is terminated, even if the exchange transmission remains busy. A second relay, which is also switched on when counting pulses are received during an existing connection, indicates, after the first relay has been switched off, the state that a high-quality connection has ended but the exchange transmission is still busy. An embodiment of the circuit arrangement according to the invention is shown in the figure, in which only the circuit details of a private branch exchange that are essential for understanding the concept of the invention are shown in simplified form. Among other things, the connection point of an extension subscriber Tn, an exchange transmission with exchange line L and parts of the facilities assigned to the exchange and located at the operator's place are shown.

Using the drawing, the establishment of a low-order connection by the extension subscriber Tn will first be described.

When the private branch exchange is switched on, the thermal relay is. Th has been heated up, which has switched on the relay B with the contacts 2 b to 4 & with its contact 1 tk. Contact 2 δ has closed a holding circuit for relay B and at the same time switched off thermal relay Th. Contact 3 b has prepared the assignment of the transfer of office.

By dialing the outside line code on the part of the subscriber Tn , the outside line dialer AW belonging to the transfer of the office is stimulated in a known manner to adjust to the connection of this subscriber. For this purpose, the relay R with contacts 5 r to 8 r is switched on via the common starting line at r. Contact 5 r switches the magnet of the exchange dialer AW to the interrupter MU. Contact 6 r switches on the monitoring lamp ÜL at the place of the Vermdttlungsbeamti-Πι, which indicates the occupancy of the Ams transmission. Contact 7 r closes the loop. Contact 8 r prepares the activation of relay C with contacts 9 c to lic. Relay C responds when the switching arms aw 1 and aw2 reach the connection of the subscriber Tn ' . Contact 19 c closes a holding circuit for relay C. Contact ioc switches through the communication path on the secondary head. Contact nc interrupts the switching circuit of the exchange dialer. Then the food shop £ responds with contacts 12 s and 13 J. Contact 12s takes over the closing of the office loop, contact 13J switches on relay V 1 with contacts 14 »1 and 15 ν ι. Contact 14z / 1 switches the RelaisiS off and the relay V 2 on . The contacts 15ΖΊ and i6z> 2 have no effect for the time being. Contact 3 b turns off the relay R and the connection line to 1 on the leading to further office transmissions starting line to 2 through. The monitoring lamp ÜL remains switched on via contact 4 b .

When the extension subscriber Tn dials the number of the desired subscriber, the feed relay 6 ″ drops out in pulses

and forwards the dialing pulses with his contact for 12 s over the trunk line L. Relay V 1 meanwhile keeps its armature unchanged in the working position due to its drop-out delay. After the call has ended, relay 5 "is permanently falling and triggers the connection devices in the public office by opening the contact for 12 seconds The relay Zi? 1 located on the exchange line can respond. Its contact 17 zn switches on the relay ZR 2 with the contacts 18 zr 2 and 19 ^ 2. Contact 19 zr 2 prepares the activation of the fee payer Za ' assigned to the exchange line, but the Switching on does not take place because the incremental circuit of the counter is also dependent on contact 21 ζ ι of the relay Zi and the switching on of this relay by the contact

so 14z / 1 of the relay V 1, which is switched off by the permanent dropping of the relay S, is prevented.

After the relay V 1 drops and during the drop-out time of the relay V 2 , which is dependent on it, the relay TR with the contacts 29 ir to 31 ir is switched on via the contacts i6z> 2, 15 ^ 1 and 27 awo. The contacts 27 awo and 2% awo are initial position contacts of the public office selector AW, which only assume their position shown in the figure when the switching arms of this selector are in the basic position. Relay Ti? binds itself via its contact 29 tr. Contact 30 tr switches off relay C. The incremental current of the exchange dialer AW is closed again via the contacts nc and 28 awo. The voter runs in the rest position.

As soon as it reaches its basic position, the contacts 2y open awo, which switches off the relay TR , and 28 awo, which interrupts the switching circuit. Contact 31 fr closes the circuit for the thermal relay Th, which then, as described above, switches on the relay B again. Its contact 3 b prepares a new assignment of the transfer of office. Contact 4 & switches off the monitoring lamp ÜL .

High-quality conversations are made possible by the

45 mediator made the extension, which for this purpose switches over the voice line 1 and the contact 32 as a switching means, not shown, in a known manner to the exchange line. The relays S, Vi and V 2 speak

.50 on, and the relay- !? falls off. The monitoring lamp ÜL is switched on via contact 4 b . After the connection has been established, the officer uses voice line 2 and contact 34Z \? of a switching means not shown in

known way to the extension part of the office transmission and causes the office selector AW to adjust to the connection of the extension part nefamer wanting the high quality connection. For this purpose, on the occasion of line 3 and contact 33 as i the relay? switched on, which closes the switching circuit for the exchange dialer with contact 5 r.

In the transmission of the exchange, the relay C responds as soon as the switching arms of the exchange dialer reach the connection of the subscriber Tn . After the extension participant has been informed and accepted the call, the officer leaves the connection. The contacts 32 as, 33 as and 34 vs go back to the rest position. There is now the same switching status within the exchange transmission as in a low-value call made by the subscriber Tn himself, but with the difference that in this case the counting pulses arising for the high-quality call, beginning with the reporting of the called subscriber, in the corresponding charge zone Arrive at intervals during the conversation.

Relay ZR 1 and subsequently relay ZR 2 are temporarily switched on by each counting pulse. The first counting pulse lets the relay Zi with the contacts 20 ζ ι to 23 si- respond via contact 18 zr 2 , which is linked via its contact 2021. Contact 21 ζ τ closes the incremental circuit for the counter Z'd, which is now incremented by contact 19 zr 2 . Contact 22 ζ ι switches on relay Z 2> with contacts 24 s 2 to 2602, which binds itself via contact 24 # 2. The monitoring lamp ÜL remains switched on continuously via contact 23 ζ τ.

The release at the end of the conversation 90 · is initiated by the dropping of the relay 5 ". Then the relays Vi, V2 and Zi drop out. The relays Vi and V2 , as already described, trigger the home dialer by switching on the relay TT?" . The monitoring lamp ÜL is now switched to the interrupter FlU via the contacts 23 ζ τ and 25 ζ 2. In contrast to the state during the occupancy of the office transmission, the lamp now lights up intermittently of the termination of the high-quality call and asks to read the charge counter Za and · return it to the zero position. The open contact 26 ζ 2 prevents the activation of the thermal relay Th and thus the reactivation of the relay B. The exchange transmission can therefore not yet be restarted Only when the officer presses the reset button of the counter Za ' does this button depend on the With contact TZ, relay B is switched on again. Its contact 4 & switches off the * relay Z 2. The monitoring lamp ÜL goes out permanently. Contact 3 b prepares a new assignment of the exchange transmission by switching on the relay i? before.

Claims (1)

PATENT CLAIM: Circuit arrangement for telephone PBXs associated with the trunk lines Charge counters, characterized by two when the first counting pulse arrives Relays that come into effect while a high-quality connection exists (Zi, Z 2), the first of which is effective only during the existence of a high-quality connection lais (Z ι) dominates the circuit for the charge meter (Za) , which can only be influenced by the incoming counting pulses for high-quality connections, the second relay (Z 2), which is effective when the branch officer is released, controls the lower-order connections when the lower-value connections are terminated the automatic release of the official transmission causing the Sehaltmittel (Th) prevents and both relays (Z 1, Z 2) a monitoring lamp (ÜL) in different / the respective connection status (call or connection terminated) characteristically influence (constantly burning, flickering). Considered publications:
German Patent No. 645 29r;
SEG-Nachrichten, '1953 issue 3, p. 3 ff;
Dissertation by LFMü1ler, "The counting of calls in telephone technology", 1929, pp. 95 to 97. 1 sheet of drawings