DEI0010097MA - - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

Registration date: April 15, 1955. Advertised on June 28, 1956

GERMAN PATENT OFFICE

The invention relates to a circuit arrangement for switching systems, in particular automatic telephone exchanges with subscriber and group dial levels as well as memory and marking operation. As connecting organs are in the embodiment shown Single switches using existing multiple switches based on the coordinate principle, although the Use of different types of switch or selector is conceivable.

It is known in switching systems with memory and marking operation that the training these control organs for the connection establishment in all electoral levels with the exception of the outgoing Elective level can be the same because the circuit-related requirements are the same here. this is to be understood in such a way that, for example, from the first group election level onwards through all others Group dialing levels up to the line selection level or incoming subscriber selection level the conditions are the same for each connection to be established. The incoming The end of each partial connection within these electoral levels is in any case indicated by the assignment of of the previous elective level. The outgoing end of the partial connections within ^ the is determined by the setting information recorded in the memory.

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placed. Thus, the markers assigned to the individual selection levels each have precise information about the starting point and end point of the partial connection to be controlled by them.
The situation is different, however, with the outgoing subscriber selection level. Here, the starting point of the partial connection is given by the connection incentive of a calling subscriber and the end point by a free memory that is stored by the

ίο calling subscriber is desired. This one both pieces of information to the marker of the. outgoing participant selection level not directly to the Can be made available, the marker must have special facilities in order to first use the Connection incentive. of a calling party to determine and evaluate, and then Determine a free memory that is used by the calling subscriber via the existing preselection organization can be achieved. These special facilities make the marker act as the central Control organ is not only heavily loaded, but is also designed to be complicated anyway, even more expensive. In addition, this means that the marker is in the outgoing subscriber selection level must be designed differently than the markers for all other electoral levels. There must be a disadvantage here for the uniformity of the switching system. be seen.

The invention is based on the problem of the uniform design of the markers for everyone To allow optional levels of the switching system and the solution of special tasks for the outgoing To solve subscriber selection level according to the invention in such a way that the subscriber selection level one or more test devices are assigned, which the connection incentive by a Determine calling line, determine a free memory depending on this and according to occupancy this memory cause a marker to control the connection between callers Line and occupied memory. Thus, a special facility takes over the additional ones Switching tasks in the outgoing subscriber selection level, so that the marker in the subscriber selection level, which in the case of circulatory systems is used for outgoing and incoming traffic, not only suitable for both types of traffic, but also has the same design as the markers in the group selection levels.

The invention is explained in more detail on the basis of an exemplary embodiment with the aid of the figures explained. Here shows /

Fig. Ι a schematic diagram of a switching system according to the invention,

FIGS. 2 and 3 show the memory connection device with memories,

Fig. 4 the call search level or second preselection level,

Fig. 5 shows the connector of the call searcher stage,

6 and 7 the test device,
Fig. 8 the markers,

9 and 10 show the connector of the call searcher stage, ■■■. ".

Fig. 11, 12 and 13. the circuits for the mar- ' kier,

14 and 15 the preselection stage and the limit switches with associated connector,

16, 17 and 18 show the circuits for markers,

19 shows the subscriber line circuit,

20 to 23 the connector for limit switches with lines to the marker,

24 shows the general plan showing how the individual peelings 2 to 23 belong together.

Fig. Ι shows a subscriber selection device SL and a group selection device SG. The subscriber selection device can perform two different switching functions, namely the connection of a calling subscriber to the various dial levels and the selection of a specific subscriber. The group selector selects a line from a specific group, the group containing the called party. The expression “group” in this context refers to a certain number of participants who are served by the participant selection device SL .

The participants from a group each have a line la, which leads to the office, namely to a facility JL, which is individually assigned to each participant. In order to connect a calling line La to the memory EN , a number of connection stages are available which consist of the following elements: line switch ST and caller CA. The subscribers who belong to a group and are served by a subscriber selection device SL are divided into a number of subgroups, each subgroup being operated by individual switches ST .

The call seekers CA in connection with their jointly assigned control organs select a free limit switch ST which belongs to the subgroup in which the calling subscriber is located. The call seekers CA are divided into a number of sections, and all call seekers of the same section have access to the same exits.

Each call seeker CA is connected to a memory connector JE via a distribution device RP ι and via this to the first switches of the group selection device SG, which is used to select a subscriber group within an office. This memory connector ensures the interconnection of the dialing levels and can have devices for feeding the calling and called memory. Each connector JE can be temporarily connected to a memory EN via a memory finder CHE .

The limit switches ST and the call seeker CA ensure the connection of a calling subscriber Ab with a memory connector JE and via this with a memory EA ^. These various switches are set using common control devices. The limit switches ST, which have one or more partial

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Serving subscriber subgroups are set by the same common controller CST ' . This control element is referred to as a limit switch connector and is individually assigned to a switch frame. Depending on the traffic volume, a corresponding number of limit switch frames is provided, in general at least two such frames, so that the subscribers of a subgroup can always be reached if one of the frames is temporarily out of order.

The call searchers CA are operated by two control elements, namely by an examiner TE and a connector CCA. The tester or the testing device TB is used to select a call searcher CA which has access to a free memory. The connector CCA has the task of selecting a line which is connected to the call seekers CA and to the limit switches ST

ao ends.

The limit switch connector CST and the testing devices TE have access to the markers that operate this subscriber selection device. A subscriber selection device, which is available for a group of 500 subscribers, for example, is set by a plurality of markers, two markers being assumed in the example under consideration. This makes it possible to control two independent connections at the same time.

The marker, which is commonly assigned to all subgroups of call seekers and limit switches of a subscriber group, is temporarily assigned to the aforementioned control organs in order to establish the connection between a calling subscriber and a memory. The group selection device SG is controlled in the same way by two markers and therefore also allows two simultaneous connection establishment. The group selection device contains two selection levels, namely the group switching level SP with the associated control element, the connector CSP, and the second group selection level SS with the connector CSS. The line Ig, which leads to the first group selection stage SP , is connected to the memory connector JE . The mixed bundles between the first and second group-dialing levels are arranged in such a way that each line entering the first group-dialing level can reach every line of the second group-dialing level. The same arrangement is present in the subscriber selection device between the switching stages ST and CA. The CSP connectors of the first group selection level have two functions, namely to record the identity code of the marker which was selected for setting the group selection level, and to find out from the first group selection level a free line to the second group selection level.

The markers M (G) which belong to the group selection device SG are designed in such a way that they identify a potential on a specific line which corresponds to the group called. In the same way, the markers can carry out a double check, which has the purpose of eliminating all markers, with the exception of the one which is currently marking a group. The CSS connector has the task of looking for a free outgoing line within the marked group.

The switching functions for establishing the connection of the switching stages described are now shown outlined in broad outline.

When a subscriber Ab picks up his receiver, his call is established in the subscriber circuit IL . The call stimulus then runs via common test relays, which the call seekers CA determine who have access to free memories. At the same time, a test facility is occupied. The test device then controls the occupancy of a marker M (L), the test device simultaneously looking for a free memory. The memory connector IE, which has access to the selected call searcher CA , is occupied and reaches a free memory via a memory searcher CHE.

The occupied memory then switches the calling line to the limit switch ST, which belongs to the calling subscriber subgroup. The connector CST, which operates the occupied limit switch, is switched on and marks the occupied line as calling on the contacts of the call seeker CA. The call seeker connector CCA is looking for a limit switch ST which contains calling lines. The occupied marker causes the activation of the switching magnet in the call seeker stage and final selection stage and, depending on this, the activation of the isolating relay assigned to the calling subscriber. The connection between the calling subscriber and the memory is thus established. The marker and the testing device are then released. The calling subscriber then receives the selection prompt from the memory in a known manner.

Thus, with the help of the testing device TE, which is provided exclusively in the subscriber selection device, the connection between the calling subscriber and a free memory is established. The purpose of this special device is to carry out switching functions that only occur in the subscriber switching stage. Because it is known that in all other dialing levels the incoming connection is always identified by the occupancy of the previous dialing level and the respective outgoing end is determined by the setting information recorded in the memory. This applies to all group dialing levels and line selection level 12 »in the incoming direction.

In contrast to this, in the preselection level or in the outgoing subscriber selection level, there is absolutely no Information about the incoming and outgoing end of the desired connection. It's 12.5, only when you pick up the handset

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the calling subscriber given a connection incentive, which must trigger the incoming and outgoing end in the organs. To determine the participant voting level. The connection incentive must therefore first determine the necessary identifiers for the outgoing and incoming end of this partial connection via special devices. In the present case, this special device consists of the aforementioned test device. The purpose of this test device is to take over these special functions so that the other connection and control elements in the subscriber selection level can be carried out in exactly the same way as in the other switching levels. Thus, by inserting the test device for the special tasks in the outgoing subscriber selection stage, a uniform and thus economical structure of the entire switching system is given.

Circuit details will now be shown with the aid of FIGS. 2 through 23. FIG which when a connection incentive occurs by a calling subscriber the special Switching functions emerge, which a test device to establish a connection between a calling subscriber and a free memory.

When a calling subscriber Ab picks up his receiver, the following circuit is established (Fig. 19):

Battery, windings of relay la, break contact Ib 6, α-wire, subscriber station Ab, b-wire, break contact Ib 2, earth.

The call relay la responds. This closes the following circuit with contact la2:

Battery, relay Ip, normally closed contact / £ 13 , normally open contact la 2, earth.

Relay Ip responds here. Via its working contacts la 3 and la 4, the relay to prepares the marking circuits of the calling subscriber in the group of 50 assigned to him. The group of 50 of the calling subscriber is identified with relay Ip. Since the subscriber selection device serves 500 subscribers, ten relays Ip are required. The multiple arrow provided with the index 52 indicates that this relay is assigned to a group of 50 and can be switched on by a corresponding number of participants. There are also two additional lines.
'The relay Ip responds as soon as a call within the Soer group is on hold. The relay Ip creates the following holding circuit with its normally open contact Ip ι:

Earth, normally open contact Ipτ, line 35, normally closed, contact tv 6, line 84 (Fig. 15, 16, 11 and 6), battery in the distribution device via the test relay dei ... dej of the common test device RCT.

It is assumed that the limit switch frames are fully expanded and have 16 individual switches each. Thus there are 16 lines 84 per 50 group, which are multiple switched to the ten 50 groups which belong to a subscriber selection device. The line that ends at the common testing device RCT shows the free lines of the call seeker groups according to the relays that have been activated.

There are three types of conduits to be considered, individual conduits which each end at a limit switch in a subgroup, some common lines, which at the limit switches of two or three subgroups end, and common lines which all Subgroups are assigned. It should be noted that when individual lines are free these are preferred to the partially shared lines. The latter have again an advantage over the common lines. . ■

Since it is assumed that there are four call seekers and 50 switch subgroups, the device RCT (Fig. 6) contains seven relays de, which determine the different classes of the lines when they are addressed. Four of these seven relays, namely relays de4, de 5, de 6 and de J, are assigned to the individual lines of each subgroup. Two further relays, de 2 and de 3, are assigned to the partially common lines of two subgroups, and the last relay, dei, belongs to the common line.

It is assumed that there are idle individual lines in the first call finder subgroup. Therefore relay de 4 has responded. Via contact de 4/4, relay de 4 closes the response circuit for relay dd, which picks up. The response circuit for relay df 1 is prepared via normally open contact de4.l1, whereby the first assignable call seeker subgroup is identified. The response of relay dd causes the test circuits for the call seekers to close. One relay dd is provided for each 30 call seekers. The relay dd closes the following circuit via its normally open contact dd 1:

Earth (Fig. 2), normally open contact 1 each , line m, normally closed contact av 6, line 13 (Fig. 5 and 6), normally open contact dd 1, resistor Re 22, relay da, battery.

. Here relay in which the subgroup's talking to, which contains free call seekers have access to free memory. There are as many relays as there are subgroups, four in the example described. There are also 56 lines m , which correspond to the 56 memory connection devices that have access to 56 searchers.

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It therefore speaks to the relay da ι, which belongs to the first call seeker subgroup, and closes the following circuit with its working contact da i / i:

Earth, working contacts de4 / 1, dai / i, relay df ι, battery.

The relay df 1 responds, and relay da 1 closes the following circuit with its normally open contact dai / 2:

Earth, make contact da 1/2, break contact ^ chain df τ / ζ to df 4/5, upper winding of relay de, battery.

The relay de, whose lower winding is short-circuited by its normally closed contact de 1, does not respond at this moment.

The relay df 1 allows after its response the occupancy of one of the two test devices, which is assigned to this call seeker subgroup, and reports that the first subgroup contains free call seekers who have at least access to a free memory and to free limit switches.

The relay df 1 closes the following circuit in the first test device via the normally open contact df i / i:

Earth, normally open contact dfili, line 101, normally closed contact fs' 1/1, right winding of relay / ji, normally closed contact ft 1, battery.

The relay df 1 closes an analog circuit for the second test device TE '. Via its normally open contact df 1/2 and normally open contact df 1/4, the relay df 1 prepares a holding circuit for the first and second test equipment, namely for the test relay that was selected and for the switch relay of the subgroup during the search process. Via its contact df 1/5 , relay df \ opens the response circuit for relay dc, which, as already mentioned, has not picked up because it is delayed. Via its normally closed contact df lly , relay df 1 opens the response circuit for relay df, which belongs to a subgroup that only has common lines, whereas there is a subgroup that has individual lines and therefore has the advantage, as already mentioned.

The response circuit for relay fs 1 is in each of the two test equipment «! been closed. Each test device contains a relay fs corresponding to the subgroup of call seekers that can be used to determine a free memory. The response circuits of the relays fs of the same rank switch off each other, so that only a test device with a call seeker subgroup at this moment. can be interconnected. Since one of the two relays responds faster than the other, it opens the response circuit of the corresponding relay in the other test facility. It is assumed in this case that the relay fsi, which belongs to the test device no. 1, responds before the relay fs'ι. Thus, the testing device TE takes care of searching for a caller in subgroup no. 1.

The energized relay fs 1 opens the response circuit for relay // 1 via its normally closed contact fs i / i. The relay fs 1 closes the following circuit with its normally open contact fs 1/2:

Earth, normally open contact df 1/2, line 100, relay fnx, left winding of relay fsi, normally open contact fs 1/2, distributor DJSi, normally closed contact fdi, relay ft, battery.

■ · The relays ft and fn respond in series. The relay fs 1 opens the chain of identical break contacts of the Reilads fs via its normally closed contact. This chain, in connection with the distributor DJS, changes the preference given to the various subgroups when there are several call seeker subgroups. When it responds, the relay ft opens the excitation circuit for relay fs 1 via its normally closed contact ft 1 , which is maintained via its second winding with normally open contact fs 1/2. The relay ft closes the following circuit with its normally open contact ft 2:

Earth, right winding of the double test relay fc, normally open contact ft 2, battery ,, and in parallel with this ground, relay / g ·, normally closed contact // n, normally open contact ft 2, battery.

The relays fc and fg respond . Via the working contacts ft 3 and ft 4, the relay ft prepares those circuits which control the connection between the test device and the marker.

The relay fnx, which responds in series with the relays ft and fs ι , causes the connection of the occupied test device with all control lines of the desired subgroup, in this case the first subgroup.

It should be noted that there are as many relays fn as there are relays fs, each of which corresponds to a call seeker subgroup. Via its normally open contact fn 1 in conjunction with normally open contact fg 1, relay fn 1 closes the response circuit for relay fei, namely via

Earth at the working contact 1 each in the memory connector / E (Fig. 2), a circuit already described, line 13 (Fig. 5 and 6), working contact dd i / i, line 95, working contacts fm and fgi, right winding of relay fe i , Battery.

Since the relay fe belongs to a free call seeker in a subgroup, as many identical circuits are closed as there are call seekers in a subgroup and have access to a free memory. There are therefore n · p lines 95, ie «lines per subgroup, which are connected to η test relays from η seekers one

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End subgroup. Via its normally open contact ffi2 , the relay fn prepares the holding circuit for an individual relay fe when it is triggered, which identifies the call seeker via which the connection is to be established. The relay fn prepares the connection of the test device to the memory connector JE via its working contacts fn 3 and fn \ . The response circuit of relay cj is prepared via its normally open contact fn 5, the response of which indicates the receipt of the identifier of the marker which is to control the search process for the calling line. Via its normally open contact fn6 , the relay fn prepares the response circuit for relay ch , which enables the receipt of the identifier of the occupied marker.

As has already been pointed out, one or more relay fe address, wherein each one of those belongs to a call examiner group which has a free line to a free. Owns memory. The designated 1 normally closed contacts of the various relays fe are in a chain connection so that only one of the relays can hold. It is in each case that relays are held, which lies in the chain at best, and the circuits for the other relays fe separate. In the example under consideration, it is assumed that the relay fe 1 remains picked up.
.30 This relay opens the response circuit for the other relays fe via its normally closed contact feil 1 and at the same time creates the following holding circuit:

an already described circuit, line 13 (Fig. 5 and 6), make contact dd i / i, relay db, line 94, make contact fn 2, left winding of relay fei, make contact fei / i, distributor DJS2, relay fh, battery.

The relay fei creates a holding circuit, and in series with this the relays fh and db respond . Via its normally open contact fe 1/2, relay fe ι prepares a second holding circuit until the connection is established.

When it is triggered, relay fh controls the occupancy of a viewfinder. It opens the response circuit for relay fg via its normally closed contact fh 1, so that the latter drops out. Via its normally open contact fh ι it closes the response circuit for the starting relay of distributor DJS 2. Via its normally open contact / 7 «2, relay fh closes the following circuit:

Earth, normally open contact fc 3 of the addressed. Relay fc, relay fb, make contacts fh 2 and fn6, line 97 (Fig. 6 and 5), break contacts cn ι and cn'i, resistor Re io, relay ch, battery.

Here the relay fb responds, but not the relay ch, which is a limiting relay.

Relay fh closes a second holding circuit for test relay fs i via its normally open contact fh 3. It closes the response circuit for relay fd via its normally open contact / Ti 4, so that it picks up. .

■ The activated relay db initiates the connection of the test device with the selected call seeker. There is one relay db per call seeker, specifically η · p relay db, because η call seekers are present per subgroup.

Via its ■ normally open contact db 1, relay db closes the circuit for selecting a memory:

Earth, normally open contact db 1, line 12, line b (Fig. 4 and 2), normally closed contact yes 2, line 3, normally closed contact jbi, resistor Re 1, relay eä, battery.

A relay ea responds here. Via its normally open contact db2, relay db prepares the response circuit for the magnet AV, which connects the caller to the test facility. '

Via its normally open contact db 3, it prepares the circuit for the discharge line to the marker. It is noted in this regard that the contacts db 2 and db 3 of η relays db, which belong to η call seekers of a subgroup, are multiple-switched with one another. Furthermore, there are p wires 92 and p wires 93, which are multiple-switched with the lines to p call searcher subgroups.

The test relay fb of a call seeker frame responds via a circuit already described. With the help of this relay, the occupied test device checks that no other test device has occupied this frame. Relay fb switches its high-resistance A-winding in parallel via its normally open contact fb ι and thus enables the limiting relay ch of the call finder connector to be addressed via the left winding of the double test relay fc.

As soon as this relay (differential relay) is excited evenly across both windings, it drops out and opens its contacts. Among other things, it also opens the normally open contact fc 2, which had closed the response 105 circuit of relay fk. The latter did not respond because its second winding is short-circuited via its own break contact.

The relay fb closes the following circuit with its contact fb 2:

Earth, normally open contact / 62, normally closed contact fc2, line 107, line in, line 107 in the marker (Fig. 8), normally closed contact mV 1, left winding of relay mb 1, normally closed contacts mae 1 and ml τ, battery.

Relay fb closes an analog circuit in marker no. 2 via its normally open contact fb 3, via relay mb ' 1.

As already mentioned, two markers can be assigned to the participant selector, so that two connections can be established at the same time. Because of this, these Both markers are connected to two test devices when searching for a calling line

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which are available to the call finder subgroups.

However, each marker contains only one relay mb for connecting the test device, which can be maintained. The response circuits of the relays mb in the two markers switch simultaneously to prevent a test device from being connected to two markers at the same time. The relay mb i, which belongs to the occupied testing device TE , therefore speaks z. B. in the marker M ι. It has been noted, however, that relay fd responded at the same instant as relay fh. The task of the relay fd is to trigger the test equipment when several calls are on hold, thereby enabling the calls to be processed one after the other. In the previous description it was assumed that there is only one call at the moment. For this reason, the continued function of this relay is not of interest at the moment. It was also found that the relay ca responded in the memory interface device CHE . These relays are so-called control relays for waiting calls in the stores. There are four such relays ea , each associated with 14 memory connectors.

In reality the memories are an office

divided into groups of seven memories, each group being accessible from any memory connector. These memory connectors are interconnected with 56 call searchers CA which belong to different subscriber selection devices. One and the same group of seven storage tanks can therefore be reached by several groups of 500 participants each.

Each memory EN can therefore be assigned to two connection devices CHE , each serving 28 lines that end at the connector JE. Each memory therefore serves 56 connections. The 14 viewfinders for connection are housed in a frame, the multiple of which is cut open in the middle. The memory No. 1 can therefore be connected to the connection devices 1 and 8, the memory No. 2 with the connection devices 2 and 9, etc.

These arrangements are made due to the fact that the connections between memories and connection devices have more than five wires.

The relays ea ι and ea 2 therefore correspond to the first 28 outgoing lines, the relays ea.3 and ea 4 to the last 28 lines. The relays eai and ea?> Are assigned to two groups of 14 outgoing lines each with half a frame, which can be reached by the activated selection magnets in the switch position "up", while the relays ea 2 and ea 4 to the other groups of 14 lines each which belong to the two frame halves, which can be reached by the selected selection magnets in the switch position "down". . .

In the present description it is assumed that the relay ea 1 has picked up. The memory connector JE, which is to be connected to the memory seeker, belongs to the first group of 14 lines of the first half of the frame and thus to a group which can be reached by the selection magnets of this frame when they have responded in the "up" position .

The relay ea closes the following circuit with its normally open contact eai / i:

Earth, normally open contact ea i / i, normally closed contact eb 2/1, relays eb 1 and ed τ, battery.

The relays eb 1 and ed 1 pick up. The relay ea 1 closes the following circuit via its normally open contact ea 1/2:

Earth, normally open contact ea 1/2, normally closed contact eb 2/3, relay ec 1, normally closed contact ec2.f \, chain of normally closed contacts es ι etc., battery.

The relay ec 1 responds here. The energized relays eb and ed determine half the frame of the memory seeker, ie the group of 28 outgoing lines. The relay ed is an auxiliary relay and performs the same functions as relay eb. With its normally closed contact eb i / i, relay eb 1 opens the response circuit of relays eb 2 and ed 2, which belong to the other half of the frame. With a working contact eb 2.1 it prepares the Ansprechstromkreis for selecting Magnets it. It is also noted that each relay eb has 28 contacts eb2 · each of which belongs to a connector. "Relay eb 1 opens the response circuit for relay ec 2 via the normally closed contact eb 1/4 in order to prevent a cross connection for the selection magnets, which respond in the" up "and" down "positions.

The relay ed 1 closes the following circuit with its normally open contact ed 1/2:

Earth, normally open contact ed 1/2, normally closed contact eh 1, lower winding of relay eei, normally closed contact rl ι, resistance i? <? 3, battery.

Relay ee 1 responds here. Via its working contact ed i / i (each such contact belongs to a memory), the relay ed 1 prepares the holding circuit for the relay ee 1 and for the switching magnet EW, which belongs to the selected viewfinder of the memory finder frame.

The addressed relay ec 1 determines the group of outgoing lines of that half of the frame, which are reached by the selection magnet in the actuated "up" position, and indicates that no selection magnet has previously been actuated. With its normally closed contact ec i / i it opens the response circuit for relay ec2, which belongs to the selection magnet which is operated in the "down" position. With its normally closed contact ec 1/2 the relay ec 1 opens the response circuit for the switching magnet EW, which cannot respond until the selection

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magnets are in rest position. The relay ec ι closes the following circuit with its normally open contact ec 1/3:

Battery,. . ., Chain of rest contacts are 1, working contact ec 1/3, Selection magnet to make contact eb 1/2, normally closed contact 7 & 1, already described, a circuit ground in the testing device RCT, dbi via contact.

One or more magnets to speak, but only one can hold on to, and that the one who is in the chain at best, for. B. Magnet es in Fig. 3. This opens the response circuits for the other magnets with the help of its normally closed contact es 1 . The magnet it continues to hold itself through .s its working contact es 1. Via the same contact it opens the response circuit for relay ec 1, which drops out. With its Arfoeitskontakt it prepares the magnet it from the Ansprechstromkreis for the through-connection magnetic EW second

As already mentioned, relay ee 1 responds. There are m identical relays ee 1, as many as memory are provided. These relays are used to determine that the memories are free. In the present description, only the case has been considered in which seven memories are connected to half the frame of the memory searchers.

. A memory that is already occupied by a subscriber is identified by the response of the relay rl . This relay opens with its normally closed contact rl ι the response circuit for the corresponding memory test relay ee 1. It is assumed that the relay rl of a memory has dropped out, which indicates that this memory is free. There can also be several memories "free within a group. A relay ee is provided for each of them, which responds via a circuit that is exactly the same as for relay eei. The contacts with index 1 of the various relays ee are in Chain connection so that only one of these relays can be held, the preference of one relay being determined by distributor DJS 3. It is assumed here that relay ee 1. It opens the holding circuits of the via its break contact ee 1 other relay ee, and via its. make contact ee 1 it closes the following circuit:

Battery, make contact es 2 of the attracted selection magnet es, break contacts ec2 / 2 and eciJ2, relay eh, distributor DJS2 ,, make contact eei / i, upper winding of relay eei, make contact ed 1/2, upper winding of magnet EW, earth.

This circuit provides a holding circuit for relay ee 1 and causes the response of Andrückmagneten EW and relay anyway. After addressing relay eh opens this with its normally closed contact eh 1, the Ansprechstromkreise the unselected relay ee, causing about his work contact eh 1, the start of the Distributor DJS 3. The switching magnet EW closes the connection contacts a, b, c, t, αϊ, bi, ei, ti when it is triggered. With contact b of the memory seeker, the ground potential of the normally open contact db ι is applied to the relay ra , which responds with a delay because its second winding is short-circuited.

The description for the switching functions for the occupancy of a memory is thus finished.

The relay ra closes its contacts and thus completes the response circuit for relay ja. It closes the holding circuit for the magnet EW via its normally open contact ra2 , namely via its two windings.

After it has responded, the relay yes identifies the connection of the memory with the connector JE. With its normally closed contacts jai, ja2 and ja2> Relay yes opens the lines to the group selection device ^ G. Via its normally open contact yes 4 , it prepares the holding earth for the call seeker's switching magnet. Via its normally open contact yes 5, it applies ground potential to the test and holding wires m of the test device, specifically in the case when the memory is occupied by a call in the last group.

During the search process for a memory, the test device searches for a marker, the relay mb 1 in the marker M 1 has responded when the limiting relay ch in the connector of the caller is attracted. The circuit for the identifier of the marker is prepared via normally open contact ch 1, namely that marker which controls the search process for the connection to the calling subscriber.

With . Working contact mb 1/3 closes the relay mbi, which determines the assignment of the marker by the test device, the following circuit:

Earth (Fig. 7), resistor Re 26, normally open contact ft2, line 108, line in, line 108 in the marker (Fig. 8), right winding. of relay mb 1, make contact mb 1/3, break contacts mb 2/3 and mafi, chain of break contacts mcw / 3 and mc {n + i) J2>, break contact mf 2, relay mae, battery.

This circuit ensures that relay mb 1 is held and causes relay mae to respond. Relay mb 1 opens the response circuit for relay mb'i via its normally closed contact mb i / i. The following circuit is closed via its working contact mb 1/4:

Earth, make contact mb 1/4, break contact mb 2/2, line 119, break contacts men / 2 and mc (n + i) / 2, relay ma, battery. ^lz "

This is where ma speaks. The operating contact mb 6 prepares the response circuit for relay ff , which maintains the connection in the testing device TE . With working contact mb 7, the marking of the calling line is transferred to the

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cycle the limit switch. The following circuit is closed with the make contact mb 5:

Earth in memory (Fig. 3), relay rca, contact c of the seeker CHB, line djs, normally open contact db 3, line 92, normally open contact fn 4, line 104, line 111, line 104 , normally open contact mb 5, line 117, normally closed contact mg 2, resistance Re 27, relay mg-, battery.

Relay mg responds here, but not the class relay in the memory.

The response of the relay mg controls the occupancy of the memory by the test device.With make contact mg 1 , relay mg creates a holding circuit for itself by applying ground potential via contact ma 3. With break contact mg 2 the response circuit for relay mg is opened and with make contact mg 2 the circuit prepared which is used to transmit the class identifier of the calling memory. With contact mb 9 the circuit is prepared for the transmission of the identity code of the occupied marker to the connector CCA of the call seeker. With normally closed contact me 1, the response circuit for relay mb 1, which is held, is opened. The relay ma, which is in the holding circuit of the marker, responds and is used to trigger all the switching functions that carry out the marking of the calling line on the contacts of the limit switch and the connection of the calling subscriber Ab to the selected memory.

The relay cj responds in the connector CCA of the call seeker. Since this response occurs only when a positive potential is applied due to the presence of the rectifier Rd 1, the relay cj identifies the identity of the marker no. 1 for the connector of the call seeker. Via its normally closed contact cj 1, relay cj opens the response circuit of relay cj ', which records the identity of marker no. The response circuit for relay el is closed via the normally open contact cJ2. After its response, this relay el determines the frame which contains that caller who is connected to the memory, and also the assigned marker, in this case the first marker. Via its break contact el ι relay el opens the response circuit for relay el ', which is intended for the second marker. Via its working contact el 2, it applies ground potential to the marking lines to the limit switches and creates a holding circuit with working contact cl6. With normally open contact el 8 it closes the response circuit for the relay co. A relay co is available for each marker. In the marker, the relays m 1, maa and mab have responded. The function of the relay ma is to control the fall of all those relays which could have a disruptive effect after the marker has been occupied. The task of the relay maa

. and mab lies in the application of marking potential to the calling line. These relays respond

if the marker is occupied by the testing facility.

In the case under consideration, it was assumed that only one participant had lifted his receiver and therefore only one relay ία, for example relay ta 1, had responded. The following circuit is closed with contact ta i / i:

Earth, normally open contact toi / 1, upper winding of relay tf 1, battery.

Normally open contact tf 1/2 prepares the control circuit for searching for the calling subscriber. Relay tf τ determines the group of 50 in which the calling subscriber is located. With normally open contact tf 1/2 the relay mp is activated and with normally open contact tf 1/4 the response circuit for the control relays of the caller is prepared. It is now necessary to find a free path between) call seekers and limit switches. The response of relay tm 1 indicates, for example, that one of four paths is free. The following circuit is then closed with contact tm i / i:

Earth, normally open contact tmi / i, line73, normally closed contact ms'i / i, right winding of relay ms i, normally closed contact mt 3, battery.

The relay ms 1 responds in the marker. Relay tn 1 is also energized via contact tm 1/2. Relay ms 1 then closes the following circuit with its normally open contact ms 1/2:

Earth (Fig. 15), normally open contact tm 1/2 / normally closed contact tn 2/1, relay in i, line 72, left winding of relay msi, normally open contact ms 1/2, normally closed contact mn 2, distributor DJS4, relay mt, battery. ^lot>

Relays tn 1 and mt respond , and relay ms 1 creates its own holding circuit. The relay mt controls the assignment of a limit switch frame by the marker. The response of the relay tn 1 in the connector of the limit switch marks the selection in the limit switch frame and the group of 50 of the calling subscriber. It initiates the search process for the line which runs from this frame to the calling no subscriber. There are two relays tn per frame and marker. Each · of these relays corresponds to a group of 50. The relays switch off each other. The following circuit is closed via contact tn 1/2:

Earth, normally open contacts ta i / i and tn 1/2, normally closed contact tb 2/1, relay tb 1/2, battery.

A relay tb responds here. With contact in 1/3 the following circuit is created:

Earth, make contacts tf 1/4 and in 1/3, line 31, break contact tv5, line m, resistance rice, relay ca, battery.

A relay ca responds in the connector of the call finder. Via the contacts tn 1/4 and in 1/5

609 547/201

110097 VIII a / 21a ³

the test circuit for the calling subscriber is prepared and the circuit for sending the class identifier of the calling subscriber to the memory. The circuit for the double test relay is prepared with normally open contact tn 1/6. The following circuit is established via contact tn 1/7 :,

Earth , normally open contact ta 2, normally closed contacts
and tn ι / 7 / relay tci, normally closed contacts te 2/1, · te ι and i # i, chain of normally closed contacts tsi, battery.

Relay te 1 responds. The response circuit for relay ic 2 is opened via normally closed contacts te i / i. The selection magnets cannot respond in the "up" and "down" positions at the same time. Contact te 1/2 opens the response circuit for the switching magnet TY in order to prevent incorrect operation.

ao The contacts te 1/3 and te 1/4 are used to prepare simultaneous circuits for the selection magnet ts and the magnet tx. With contact te 1/5, relay te 1 holds itself.
A magnet ts responds, and contact tb 1 opens the response circuit for relay te 1 of the other iooer group. The following circuit is closed with normally open contact tbi / ζ:

Earth, normally open contact tb 1/5, magnets normally open contact te 1/4 ,, chain of normally closed contacts tx 1 and tsi, battery.

The magnet tx responds here. There are two magnets tx in a frame in order to make the selection of 26 lines. The magnet tx 1 is connected to the contacts tb 1/5 and tb 3/5 for the first marker and the contacts tb ' 1/5 and i &' 3/5 for the second marker. The magnet tx 2 is connected to the contacts tb 2/5 and i & 4/5 for the first marker and the contacts tb'2 / ζ, tb'4 / 5 for the second marker. The corresponding contacts of the magnets ts are in a chain connection in the event that several participants call at the same time. The magnet that corresponds to the calling subscriber attracts and immediately creates a holding circuit. The following circuit is established via contact ts2:

Battery, make contacts ts 2 and tx2, upper winding of relay te, which responds, earth.

Relay te controls the activation of the selection magnet and prevents a new selection process until the occupied marker is released. With NO contact te 1 a holding circuit is created tx for magnetic and break contact th one of the holding circuit for relay 1 te open. With contact ie 2, relay ie creates its own holding circuit. After relay te 1 has dropped out, the response circuit for magnet TY is created via normally closed contact ic 1/2:
60

Earth, upper winding of relay te, normally closed contacts ic 1/2 and te 2/2, left winding of magnet TY, normally closed contact ty 2, earth.

The magnet TY of the limit switch connector responds and closes the contacts t2, ti, dz, di. Magnet TY creates a holding circuit via its two windings with contact ty ι after it has separated its response circuit with normally closed contact i ^ 2.

In addition, the relay md in the marker is energized with normally open contact tyz. With contact ty 3 the circuit is closed in order to send the class code of the calling subscriber to the memory.

. Class identifier PC (Fig. 19), line 34, work contacts di, ty 3 and tni / 4, line 83, work contact mg · 2, a circuit already described, relay rca in the memory.

During the search process for the calling subscriber through the selected connector in the output stage, the same search process has been carried out in the connector of the call seeker in order to establish the connection between the call seeker and the limit switch. The relay in the connector of the call searcher has responded to approx . In the special case for the calling subscriber, only the relay could pick up about 1. With relay co it was checked that marker no. 1 was properly connected to the selected call seeker frame: With contact ca i / i the relay cb 1 is energized and with contact approx 1/2 the relay cc 1 is energized. The relays cb determine the selection of 26 out of 52 lines for the marker. The other switching functions for setting the call finder are essentially analogous to those of the limit switch. This applies above all for the transmission of the setting information from the marker to the connector of the call searcher stage and for the implementation of the setting and switching through in the call searcher stage through the connector assigned to it.

After switching through the call searcher level, the calling subscriber is with the previously selected one and connected storage unit via the following circuit:

Earth, resistance Re 4 (Fig. 3), left winding of relay rc, working contact rb 1, contact b of the memory seeker, & wire, already described circuit via the subscriber loop and battery via the right winding of relay rc.

The calling subscriber then receives the dialing signal and the necessary information for the setting Control organs are triggered in a known manner and are therefore available for production further connections are available.

Claims (10)

PATENT CLAIMS: I. Circuit arrangement for switching systems, in particular automatic telephone Switching systems with subscriber and 547/201 110097 VIII a / 21 a ^s Group selection levels as well as storage and marking operation, characterized in that the subscriber selection level (SL in Fig. I) is assigned one or more test devices (TE in Fig. Ι and 7) which determine the connection incentive by a calling line, depending on this a free one Determine memory (EN in Fig. 1) and after this memory is occupied, cause a marker (M [L] in Fig. 1) to control the connection between the calling line and the occupied memory via free preselection levels (ST and CA in Fig. 1) to undertake. 2. Circuit arrangement according to claim 1, characterized in that each testing device has access to all liaison bodies of the preselection level assigned to it. 3. Circuit arrangement according to claim 2, characterized in that a subscriber selection stage one or more markers are assigned together. 4. Circuit arrangement according to claim 3, characterized in that the testing devices are designed so that when there is a connection incentive they only have one of the occupy markers within their reach. 5. Circuit arrangement according to claim 4, characterized in that that of a testing device occupied markers from the test equipment information about the outgoing (calling line) and incoming end (free memory) of the connection to be established. 6. Circuit arrangement according to claim 5, characterized in that the marker automatically a free path between the outgoing and incoming end of the line to be switched through Connection selects. 7. Circuit arrangement according to claim 1 or 6, characterized in that when occupied one test device is eliminated from two test devices by a call incentive. 8. Circuit arrangement according to claim 7, characterized in that when present multiple testers and multiple markers in one subscriber selector There are connection options between all test facilities and all markers. 9. Circuit arrangement according to claim 8, characterized in that at the same time or incentives to connect two or more test facilities in quick succession evidenced which their information is based on a corresponding number of different Give markers. 10. Circuit arrangement according to claim 9, characterized in that by simultaneously multiple marker independent connections can be controlled, provided the individual! links not completely or partially made using the same connection switch frame will. In addition 8 sheets of drawings