DE1050830B - Circuit arrangement for switching equipment - Google Patents

Description

JÜLX

The invention relates to a circuit arrangement for switching devices with several Elective levels.

Switching devices are known in which a common marking multiple is used in each dialing stage is provided, via which a marker assigned to each option level its setting indicators releases after it has received the corresponding switching orders from a memory, for example Has. ίο

The use of a common marking multiple in one elective level allows within one Time unit only one marking process at a time. Care must be taken that if this is the case several simultaneous marking jobs within one electoral level one after the other Clearance takes place.

Since a switching device normally \ - a plurality of selection stages is present, care must be taken for the preparation of compounds for the fact that a connection to be established is identified in each selection stage in each case the correct part portion so that the compounds are switched properly on all selection steps.

The invention is based on the object in the aforementioned switching system with common Marking multiple to make a control of the marking processes in each option level in such a way that each complete internal connection over several stages of the switching equipment within a sequence takes place in the same time periods. For this purpose, a circuit arrangement for switching equipment with several levels of choice constructed in such a way that one is assigned to the entire system in common central control pulse generator imposes a uniform work rhythm on the sequence of all setting processes. In this case, all of the selection levels are simultaneously controlled at regular intervals supplied, during the duration of which a switching process is carried out in each of the switching stages, the in the course of the connection setup during the previous control pulse by an organ of the respective upstream switching section have been assigned.

The invention will now be explained in more detail using an exemplary embodiment with the aid of the drawings. Show here

1 and 2 show the general plan of the telephone exchange system,
• Fig. 3 to 10 a memory,

11 shows the call distributor common to all stores, __

Fig. 12 and 13 the selection device for the various Elective levels and the output test circuit of a single group elective level,

Circuit arrangement
for switching facilities

Applicant:
International

Standard Electric Corporation,
New York, NY (V. St. A.)

Representative: Dipl.-Ing. H. Ciaessen, patent attorney,
Stuttgart-Zuffenhausen, Hellmuth-Hirth-Str. 42

■ Prüritöt ν

2 & ε $

Fredrick H. Bray, Ronald G. Knight
and George C. Hartley, London,
have been named as inventors

14 shows a group selector circuit,

15 shows the control pulses used in the system and

16 shows the counting pulses used in the system.

First of all, for a better understanding, the basic one The mode of operation of the switching system is described with reference to FIGS. 1 and 2.

The participants are grouped into groups of a hundred. Come as a voter with no moving parts for example glow lamps with two anodes and a common cathode for use. The switching system winds through from a pulse generator! delivered pulses shown in FIG. 15 are controlled. Located at the end of the description a list of the time slots of the individual pulses.

When a subscriber 2 picks up his handset, a pulse identifying him is sent to the exit the call searcher 3 connected, which this subscriber the containing group. This pulse from the pulse generator 1 via line 4 to the subscriber circuit 2 is directed, identifies the position of the participant within his group of hundreds and cannot take effect on a busy caller.

The pulse generator 1 successively delivers pulses PF of duration T (FIG. 15) to all call seekers 3, which identify them and are fed to them via the line 5. Different call seekers are identified by the pulse generator 1 during successive periods T. Occurs between a call seeker identification pulse PF and a partial

809750/114

In addition to coincidence identification pulse PL at a single anode of the same caller, a discharge occurs between the cathode and the two anodes mentioned. The call searcher is thus occupied for the calling subscriber, and the subscriber is connected to a first group selector 7 via the line selector output (the common anode) and a connection circuit 6. At the same time, the call seeker and the calling subscriber are blocked. ; ■; ~ \

The first group selectors are divided into groups, each of which is assigned a pulse PG . Within a group, the individual voters are identified by pulses PEL assigned to them (FIG. 15).

If a first group selector is occupied, the combination of PG and PEL pulses characterizing this selector brings the .Speicheranschaltwähler 8 into search control. A memory switch-on selector 8 is provided for each connection circuit 6; For example, one memory can control the connection setup in the first dialing stage, while in the same period T another memory fulfills the same task in the second dialing stage, etc. The period T for each dialing process is 30 ms. The choice in each selection level is controlled by a common control circuit, each selection level having only one such control circuit.

The control of the connection establishment by a memory will now be described. After the Memory 9 has received a character to begin setting up the connection as a result of the connection to the call distributor 11, a value of the first will be used A stored number characterizing pulse from the memory 9 via the line 12 to the control circuit 13 sent to the first electoral level. All first group voters are controlled by the common control circuit

diodes or a combination of several diodes 20 13 served. The impulse that the group to be elected

contains. Only one selector can be connected to a memory at the same time, which means multiple assignments Avoid saving. If several memory switch-on selectors are in the search position, see they are connected one after the other with free memories.

The memories are connected to the individual anodes of the switch-on selector. These anodes are tapped from pulse generator 1 by pulse RH. While identifies, comes via line 14 to the first group selector, where it marks the outputs belonging to this group in all selectors.

It became a first group dialer 7 by the calling party occupied and marked. When the output marker pulses are applied on line 14, there occurs between this selector and the marker by the participant coincidence, provided an output marked by this impulse

a single period Γ each switch-on selector 30 is free. It then ignites the corresponding entall memory connected to it. Is a memory charge path of the first group selector, so that

free, the coincidence between a pulse RH and the stimulus for the switch-on selector causes the corresponding path to be switched through. The first group selector is then connected to a memory and this occupies it.

After a memory 9 has been occupied by the connection circuit a dialing character generated in the first group dialer is sent to the calling subscriber

40

sends. The latter then votes, the first group voter picks up the selected characters and sends them to memory.

The invention is applicable to any switching system. It is based on a mediation system with indirect setting, the second partial connection is set up in the dem ben, in which four numbers are dialed and immediately following the first partial connection the remote office can be reached with the number 1.

the connection to the second group dialer is established. With the connection of this path is this voter occupies and terminates the marking indicator.

As soon as the control circuit 13 has fulfilled its task for this first partial connection setup for all first group dialers, it is released and can use another memory for the same partial connection setup of another call during the next period T.

The second group dialer selection stage 15 operates in exactly the same way to set up the second partial connection to manufacture. With every connection

To . The switching system works as follows to store the setting information Art. ' ■ '"■

When a memory 9 has received the last dialing digit, it connects' automatically to the call distributor 1 1 as soon as it is ready to receive. It is provided once for the entire office. The call distributor allows "only one memory to begin controlling its choice at the same time. In each individual of successive periods T , however, the call distributor II causes one of the waiting memories to begin controlling its dialing. " ■

The distinguishing feature of the switching system is that each partial connection process takes up a period T of time. As soon as the call distributor 11 has a memory at the beginning of the control period T. If all outputs of a selector are found occupied in a selection stage, a special path of this selector is switched through, via which the calling subscriber receives a busy signal.

A line selector 25 has now been seized. With all line voters the last one is common Control circuit, a line selector control circuit 17, is connected. The leadership is chosen by Control with the tens and dialing digits, which is why the Memory sends two pulse trains to circuit 17 when the latter is available. These impulses will be sent over lines 18 and 19. Since only one line selector can be marked at the same time and so on the group of one hundred participants within which the selection is to be made is selected by the coincidence of this marking with a pulse applied via line 22, which determines the position of the

rürug initiated the connection establishment, switches 65 called subscriber within its hundreds

it releases itself from this memory and causes another waiting memory} to set up its connection. The call distributor leaves: so long during everyone Period T a "memory." with the setting group indicates that the path corresponding to this called subscriber is switched through in the marked selector. If the called subscriber is busy, this impulse is ineffective and the "busy" path in the

start, as memories are available in call position. 70 Line selector is activated by a following pulse

ignited, which sends a busy signal to the calling subscriber. Corresponds to the selected No subscriber number or if the subscriber line is temporarily shut down, a different one will be used Path switched through in the voter and the calling subscriber a sign that reports this fact transmitted.

After the impulses corresponding to the last two digits have been transmitted to the last common

applied to the progressive electrode of the thousands storage tube TH, so that the discharge jumps to the cathode no. 1 (Fig. 4).

If the relay ^ in the first group selector picks up again 5, the tube TA ignites again and extinguishes the tube TB. Due to the charging time of C4, however, TC will only ignite if relay A remains energized at the end of the selected digit. The tubes TA and TB are activated when the relay opens and when it drops.

Control circuit, the memory is released and io ignites, the tube TC remains extinguished, and the tube can be loaded by another calling party. G 1 supplies negative incremental pulses to the. · Storage tube TH. The tube Gl goes out after each

The basic idea of the invention, every switching pre-ignition again when the capacitor C8 is charged transition of a connecting organ of an electoral level is because the resistance i? 25 is too great for a permanent one a certain period of time from a sequence of the same 15 discharge.

To assign time periods, should now be in the following at the end of a digit, the relay A remains energized,

Example of a first group selector in its one, the capacitor C4 charges up and the tube TC details are displayed. ignites again - your cathode delivers via the condenser

As already described in the description of the mode of operation of the CFL to CP 5 pulse to the ignition system, the first group will stretch the tubes Π to TS. Thereby, the voter of a Speicheranschaltewä'hler Tl with a prepared tube T2 ignited and T ¹ I.gelöscht, free memory connected as 3 applies in Fig. 10 to 25 T2 is positive Potenaufgezeigt to the rectifier MR. This connection takes place via the tial an, while the rectifier Mi? 24 of the tubes RHS1 and RHS 2 in Fig. 3 and 4. The cathode potential of the tube Γ1 is connected to earth.

By switching through the tubes RHS1 and 25. If the next digit is selected and the RHS2 drops across the resistors R20 and R21, a tube TB ignites with each drop in the relay A , voltage is dropped. The increase in voltage across the resistor only ignites tube G 2 , and that of the selected R20 ignites tube TA. As a result of the coupling of the incremental pulses corresponding to the digit, the tube TB is extinguished if the hundreds storage tube H is applied. On this was ignited. The cathode potential of the tube TA 30 way, the digits are stored one after the other in the tubes charges the capacitor C4 through the resistor R 22 TH, H, T and U , with the ones successively stored. The tube TIl (Fig. 10) is, as described later, turn tubes Tl to T5 ignited and at the end ben is, normally ignited, so that the tube TC is ignited through each individual digit. Charging of the capacitor C 4 when the tubes The ignition of the tube T 5 marks the end of the TIl and TA are ignited, the tube TC ignites. 35 storage process. The memory is now one-TIl tensioned the rectifier MR21 in the control gate of the.

Tube TC positive. The cathode of the tube TC is a pulse PRC applies to each memory

Via the resistor R 23 with the capacitors Rectifier MR 26 (Fig. 8) positive potential connected, CPl to CP 5, so that when igniting the and at the same time the rectifier MR 27 positive tube TC a positive pulse ignites the tube, the 40 is biased, the tube T5 puts a positive identifier from the cathode of the tube T11 was prepared to mark the internal calls and as is the case with known counting chains. The line Lc leading to the call distributor (FIG. 11). Tube Tl ignites and thus extinguishes the tube TIl, since when the tube LOT (Fig. 11) is ignited, the resistor R 24 will be a common anode resistor - the tube JTvS ^{1 will} ignite in the memory and its cathode will stand. After the occupancy, the tubes 45. assume a positive potential. Since the cathodes of the TA, TC and T1 are ignited, and the memory is connected to the tube ^ all memories are multi-connected, the dialing pulses can be ready. Do not ignite a tube * S \ S "in another storage tank.

If the relay A in the first group selector is off, the T5 tube is deleted. The after the last falls, the potential at the resistor R 20 drops, where the memory identification pulse PRC following pulse by a negative pulse through the capacitor C 5 50 PRR now ignites the tube T 7, and the tube vS "^ is connected to the cathode of the Tube TB is applied. Which is erased, so that in the next period the CRP rectifier MR 22 in its cathode line is pulsed another memory ignites its tube S-S "and thereby blocked. The tube TB ignites and extinguishes which is connected to the call distributor. The anode tube TA. At the cathode of the tube TB there is a resistance R 24, the tubes So * and Tl to T7 have a positive potential. As a result of the coupling of the Katho- 55 together.

the tube TC is deleted. Since TB Die RohrT7. Now fulfills two tasks:

and Tl are ignited, the two rectifiers carry a pulse indicating the count to the Afi? 23 and Wed? 24 at positive potential and ignite first group selector and the transmission of a the tube Eq. Impulse to the test facility for the decades and

When the tube T1 was ignited, a positive 60 single-line selection of the first group selector stage was initiated to ignite the tube TE (Fig. 6) at its (Fig. 12), which enabled the selection of a free single line cathode via the line 34 and the capacitor C 6 in the first Group selector controls. It is assumed. The result at your anode resistance that the first stored digit is a 2 and negative impulse becomes the cathode "ίί" (help that all connections with this first digit only stretch for the initial state) of all multi-cathode 65 are easy to count. The coincidence of the pulse storage tubes (Fig. 4, 8), led so that the Ent- PFP in the time slot 116 or 244, which indicates the simple charge over all storage tubes over the auxiliary line count, with voltage at the cathode 2 of the takes place. Tube TH and at the cathode of tube T 7 leaves

When the tube Gl is ignited, a negative one pulse will appear on the triggering electrode of the tube TF pulse from its anode via the capacitor C 770 (Fig. 5), since the rectifier MR 30 of

the cathode of the tube Tl, the rectifier MR 31 of the cathode 2 of the tube TH and the rectifier Mi? 32 are positively biased by the PFF pulse. The cathode of the tube Ti ⁷ is connected to pulses of the same repetition frequency as the pulses PFF . The tube TF will ignite for the duration of a pulse and send a negative pulse from its anode to the output of the register receiver tube RHS 2 , which positive biases the rectifier Mi-36 to the first, not shown. The potentials given in the drawing are customary values, so that the cathode of the tube TG assumes a potential of approximately -170V if 80V burning voltage is assumed. The rectifiers MR 37 and MR 38 are biased by the cathode of the tube TG in such a way that they turn conductive and short-circuit the output of the register switch-on selector. The memory remains occupied until the corresponding

Group selector is transmitted further and there the OK relays in the (not shown) first group selector.

initiates any necessary switching operations. The pulses PS following the pulses PM are, as shown in Fig. 5, connected to the cathodes of the tube TH . If the discharge in this tube takes place via its second cathode, then, when the tube T 7 is ignited, the tube TV (FIG. 6) becomes conductive for the duration of the pulse PS (time slot 130 or 2) and a pulse is transmitted at this time slot Transfer the line "Cl" to the test device for decade and individual line selection (Fig. 12).

This pulse, which lies in the time slot determined by the ignited cathode of the tube TH , is transmitted to the grid of the tube VT, the cathodes of the tube TH, the cathode of the tube T 7 and speaks.

The ignition of the tube TE extinguishes the tube TG and removes the blocking of the memory switch-on pulses applied to the rectifiers MR 39 and MR 40, so that the memory is free for other connections. The tubes TE and T ¹ II are ignited and the storage tubes are brought to their idle state.

The given description of the memory relates to the establishment of an internal connection. The up

20. Establish a connection to another office proceeds, as far as it takes place in the described office, in the same ■ manner as for one Internal connection. Insofar as it takes place outside the office under consideration, it is in connection with the

g g

the pulse PvS "connected network of Torschal- generated Erfmdungsgedanken 25 described herein without meanings. tung. It should however be noted that, in the here-to the tube T reasons under the same conditions set switch was vorgen itself as the tube 6 SS ignited, and the im- is seen that the pulse PS intended for a remote office following pulse PSF in the time slot 11 or calls over the internal connections preferred 139 will be dispatched to the triggering electrode of the tube T 8 via 30. In the now the following description-C

the capacitor ClO applied. Since the tubes T 6 and T 7 are ignited at the same time and thus the rectifiers MR 33 and MR 34 are positively biased, the tube T 8 ignites and extinguishes as a result of the common anode resistance i? 24 the tube T1.

The tube T 8 prepares the circuit for the passage of a pulse identifying the second dialing digit through the tube VH, which is controlled by the gate circuit connected to its grid, and practice is therefore taken into account. It is assumed that the call distributor shown in FIG. 11 is connected to a memory which serves an internal call and has therefore ignited the LOT tube. The tube VL is conductive for the duration of the pulse PCD , which covers the time segment of all pulses PRC. The tube SS in the connected store is ignited. Their positive cathode potential prevents other tubes 5 ", S" from igniting.

via the line C 2, which leads to the test device 40. The pulse PCO following the pulse PCD ignites

the OGT tube prepared by the LOT tube. During the next period T , the tube VG becomes conductive for the duration of the pulse PCD , and a positive potential appears on the connection line O / G to the memory, so that only memories containing a call intended for a remote office have the possibility of to seize the call distributor. If such memories are waiting, the tube 55 "will ignite in one of them and, after the last PRC pulse, the PRG pulse will ignite the TTA tube, since the VG tube is conductive and the 55 ignited tube. The PCO pulse will ignite the LOT tube, which was prepared by the tube OGT . However, with the pulse PDR, the tube OGT is ignited again as a result of the coincidence of the pulse with the cathode voltage of the ignited tube TTA. The tube VG will remain conductive in the next period T and again one with one closed The PDS pulse ignites the tube TTB which extinguishes the tube TTA . During the next period, the tube VG remains conductive and a memory dealing with an outgoing call is dispatched again. No such memory waits , no tube SS ignites either, and at the end of the period the tube LOT ignites. Since the tube TTA is extinguished, because no tube SS is ignited, the pulse PDR cannot do the tube OGT t ignite. During the next period T , therefore, tube VL conducts and it becomes

for the decade and individual line selection of the second group selector stage if the pulse PS appears in the next period T. The tube T 9 will ignite on the next P5P pulse if the tube T 8 was ignited and extinguish it. The cathode potential of the tube T 9, which is raised as a result, prepares the circuit for the passage of the pulses characterizing the tens and single digits during the next period T via the tubes VD and VU to the control circuit of the line selector, which checks and selects the desired subscriber connection. The coincidence of the pulse PSF with the ignited tube T 9 ignites the tube T10, which extinguishes the tube T 6, since its cathodes are coupled through the capacitor CI1. The memory trigger PRL in the time slot 110 or 238 ignites the tube T11, when the tube was ignited T 10th The tube TE is ignited by the positive pulse transmitted via the line 35 from the cathode of the tube T1 and, as a result of the coupling of the anodes, extinguishes the tube TG.

The negative pulse supplied by the anode of the tube TE is transmitted via the line 36 and resistors to the cathodes H of all storage tubes, so that the discharge jumps over to them.

Before the ignition of the tube TE , the tube TG was ignited as a result of the coincidence of the cathode potential of the ignited tube T1, which positively biases the rectifier Mi? 35 with that in the time slot

or 250 applied memory monitoring pulse, which 70 stores a memory dealing with an internal call.

manufactures. The call distributor therefore switches back and forth between a setting in which internal calls are processed and a setting in which calls intended for remote offices are processed. However, it remains in the last position as long as memories dealing with calls intended for a distant office are to be processed. Internal calls are processed in every second period T if only memories with internal calls are waiting. Two internal calls processed one after the other have a distance of 2 T, since the way the line selector works requires this distance.

For each group selection level there is a test device intended for decade and individual line selection intended. This is shown in FIGS. 12 and 13. It determines the group of to be tested Outputs and applies test pulses to the individual outputs of these groups.

As stated in the description of the memory, a pulse identifying the stored digit is transmitted to the circuit shown in FIG. The selected digit is a 2, so that a pulse PS in the time slot 2 or 130 is transmitted over the line C 1 and the tube LS2 is ignited by the coincidence of the pulses. It is assumed that the circuit shown in FIG. 12 is the control circuit of the first group selection stage which is controlled via line C 1. The common control device for the second group selection stage is controlled via line C 2. The potential of the cathode of the tube LS 2 becomes positive, and by coincidence with the pulses PT, the tubes OT become conductive again and again one after the other, so that on their cathodes, which are connected to the outputs of the second decade of all voters of the first group election stage, PT pulses appear. Ten output pulses are shown for explanation. The circuit shows the testing of outputs in staggered groups. Of the tubes for decade selection and for individual line testing of this decade, only those for decades 2 and 10 are shown.

For explanation, FIG. 13 shows the outputs of four multiple-switched groups of voters of the same selection level and a staggering example for decade 2. Three outputs are individually connected to each group of ten voters, three to each of two groups and four outputs are available for all four groups, so that in total there are twenty-two outputs in decade 2 of all four voters. These outputs are connected to the tubes OT via high resistances in such a way that all individual outputs are connected to pulses 1 to 3 with the time slot 25 to 27 or 153 to 155, the outputs connected to two multiple-switched groups are connected to the next three pulses and those with all groups connected outputs are checked by the last four pulses. The selection of a free exit by the first group selector is considered as an example. The corresponding relay RL responds in the first group selector before the exit test already described and identifies this selector by connecting a marking potential to the common cathodes of the tubes of this selector. Only one voter per unit of time is marked so that, although the output test pulses are applied to all first group selectors, they only take effect on this marked group selector. 14 shows a second group selector which is connected to the output of the first group selector and the connection of the output test pulse.

If this arrangement is free, the coincidence of the marker in the first group selector with the test pulse switches through one of the shown high resistances of the selector. The sliding rectifier MR 50 will conduct and assume a low resistance and render further application of the pulse ineffective. The output is occupied and the marking is removed from the first group selector, so that test pulses can be applied

ίο to other outputs of this voter as a result of there switching functions carried out in the meantime cannot switch this through.

The tube B in Fig. 12 fires when a pulse PS is transmitted over the line C1. After the last output test pulse PT in time slot 34 or 162, the BY tube becomes conductive and sends a

Timing description RL OPN Λ PRE J potential 20th PM 13 to 112 PL j PRG + 141 to 240 PFT j POG + 114 to 133 \ RH j PCO 242 to 5 j PCO 25th ■ 13 to 112 \ PGL j PDR . 141 to 240 - j PDS 1 to 10 \ PS J PRC 4- 129 to 138 J j PRR 30th ■ ■ 11 ) PSF j PRL 139 J 25 to 34 1 PT PRL ₊ 153 to 162 J PFR 35 35
163 1 PT "+ 241 PBT + 242 PNT 10 ) PSR ₊ 40 138 J 9 ) PR -t- 137 J 121 4- 45 249 H- 122
250 .. + 113
241 . + 5o 113
241 + 116
244 + 55 118
246 4- 120
248 + 6ο 13 to 112
141 to 240 4- 114
242 + 110
138 ■■■■ + ■. 65 36 164 143 134 4- and - 70 6th

809 '750/114

Impulse to the busy signal path of the first group dialer. So if all outputs of this selector are occupied, the busy signal path of the Voter switched through and transmitted the busy signal to the subscriber.

The tube R is ignited by the pulse PLR following the pulse PB and, as a result of the common anode resistance, extinguishes the decade selection tube (e.g. IS2), whereby the tubes OT are blocked and do not emit any output test pulses at their cathodes until the circuit is activated is occupied again by another memory.

The setting procedures for the other options, e.g. B. ILGW, LW, takes place in an analogous manner, so that a detailed description of these facilities is unnecessary.

Of course, the arrangement shown above is only an example for an arrangement of the inventive idea, its use elsewhere not hereby is excluded.

Claims (4)

Patent claims: 1. Circuit arrangement for switching equipment with several selection levels, characterized in that that a central control pulse generator which is jointly assigned to the entire system (1 in Fig. 1) imposes a uniform work rhythm on the sequence of all setting processes such that all the selection levels (6, 7 in Fig. 1 to 15; 25 in Fig. 2) at regular intervals control pulses are supplied simultaneously, during their duration in each case Switching steps a switching process is carried out, in the course of the connection establishment during the previous control pulse by a Organ of the respective upstream switching section have been assigned. 2. Circuit arrangement according to claim 1, characterized in that the control pulses the Switching elements of each switching stage common to all switching elements of this switching stage Tax multiple are forwarded. 3. A circuit arrangement according to claim 2, characterized in that a respective and ^1, only a switching operation may be caused by each control pulse at the same time in each shift stage. 4. Circuit arrangement according to claim 1 to 3 ,. characterized in that for implementation; the switching operations electronic switching means are provided. References considered: British Patent No. 665 129. In addition 5 sheets of drawings © 809 750/114 2.59