CH251035A - Circuit arrangement for a selector switch. - Google Patents

Description

Circuit arrangement for a selector switch. The object of the present invention is a provision of circuits for a si@reader switch in an installation of such an automatic telephone or analog installation. In general, the selector switches can be divided into two groups, the switches of one of the groups having a bank or banks. fixed contacts with a brush in front of each bank, this brush being able to move to make contact with all the contacts of the bank with which it is associated. To this group belongs the well-known Strovger-type switch. Such constructions require a single conductor to each brush which can connect to any of a plurality of outgoing conductors which may be of the same number as the total number of bank contacts associated with the brush. . The selector switches of the other group have pairs of cooperating contacts, so that for each conductor to one of the contacts there is a conductor from the contact which cooperates with it. This group may include selector switches and selector relays of the transverse rod type.

It will be understood that in the first group of switches, which lends itself to the use of control circuits, the possibilities of long-distance telephone connection are restricted, whereas in the second group of switches, where the possibilities of long distance connections are virtually unlimited. Control circuits are complicated and require common arrangement with other switches, at least for reasons of economy.

The object of the present invention is to provide a selector having more interurban connection facilities than those capable of being completed by moving brush switches, but still having an individual control circuit of its own.

The arrangement of circuits according to the invention comprises a number of pairs of cooperating contacts arranged in sets corresponding to the conductors of each feeder, the sets being arranged in groups having different digital ignitions, in each case. <B></B> in which a single group of moveable contact selector arms is arranged to select a group and a set of contacts within the selected group and to produce the closure of the contacts of the selected set: This arrangement is characterized in that in at least one group the corresponding contacts of the pairs of contacts of the different sets are connected in multiple to each other and to incoming conductors, and that the corresponding contacts of the pairs of contacts of the different sets of at least one other group are connected in multiples to each other and to outgoing conductors for one. group of selector switch control relays.

One embodiment of the object of the invention is shown in the appended drawing, in which the numbering of the figures corresponds to that of the figures of patent no. 247352.

fig. 23 show circuits. Fig. 24 provides switching arrangements for interchange levels, Fig. 24, which provides the bare circuitry with a direct current, alternating current outgoing pulse repeater for intercentral operation, while Fig. . 25 mun tre similar circuits. of a group of relays to complete the end of the arrival of intercentral junctions.

The invention is described in connection with a group of battery power control relays brought into service at the originating exchange to actuate switches in that exchange, this group of relays being connected to the outside when the call must be forwarded by an outgoing junction. In the following arrangement, described with reference to FIG. 23, relay contacts in the talk connections to the outgoing junction repeater relay groups (Fig. 24) are avoided altogether.

fig. 23 represents xde faeon seh6matique a selector switch which presents pairs of cooperating coils arranged in sets, these sets being arranged in groups; Ordinarily ten sets of contact pairs will be arranged in one level to form a group and the selector switch will comprise ten levels. One contact of each pair is constituted by a tooth of a comb, so that corresponding contacts of each pair of the different sets in one level of the group are multipled together by a comb. The other contact of each pair is connected to a leaving multiple and as shown, there are three pairs per group, one pair corresponding to each conversation conductor, and one pair to the private line. Such a switch is described in more detail in Patent No. 247349.

The fourth pair of allocated contacts. ä -an group is not employed in the present invention. Normally, on a bank of selectors, the peio es belonging to each of the different canductors, i.e. negative, positive and private, are all linked together, but:0ü, for example, levels 1-9 of a first selector where Bonner has access to the local switching train, and where the level 0 must have access to starting junctions, the ablage of the combs can be interrupted, that is to say that the. RTI conversation conductors ID="0002.0276" WI="13" HE="4" LX="1185" LY="511"> incoming will be connected by contacts og3 <I>and</I> og4 of a relay OG dependent on a group of control relays (deerit more particularly with regard to fig. 22 of patent na 24735.1) with combs 1-9, and will be connected directly with the combs of level 0 .

The group of control relays in fig. 22 of the aforesaid patent is put into operation in the usual manner and if any of digits 1-9 are transmitted, the selector train is formed in the usual way as described in that patent, but if the digit 0 is transmitted for the purpose of a call by an outgoing junction, then the directly connected level 0 combs operate in the following way: when a free outgoing repeater is found , the 1st relay OG will be attracted by its low resistance left winding by the bb contacts set to . terminal of the control relay group BB, To the free marking battery resistor which will be connected with the P conductor entering the starting repeater, the low resistance winding of the relay OG serving as Bard's potential and also to actuate relay OG, which then decannects contacts og3 <I>and</I> og4 to the control group circuit. During the release of the control group, which will take place approximately 150 milliseconds after the opening of the loop Towards it, when the relay <I>CC</I> attracts and releases the relay BB, the loop the subscriber will be extended forward to activate the impulse reception relay and in turn the Bard relay in the starting group of relays, and a Bard and holding relay will be extended backwards to maintain the relay OG by its other winding, before relay Bb' in the control group, which previously held it, releases. The subscriber is now directly connected to. the outgoing repeater which will receive the test pulses which are to be transmitted, and which will provide battery power to the calling subscriber. Of course, the Test selector is held by the P conductor from earth to the outgoing relay group, which will extend through contacts og2 and through the control group to the Primary control relay of the selector.

The above arrangement can be applied in the ras where the group selector has only one level giving access to the local switches in the central, and the other levels all around access to the starting pointer going to the left. 'other Gen- trals, the. the only difference being that the group of control relays, instead of being connected to the First nine levels, will only be connected at the upper level to local switches, while the other levels will be connected directly to the incoming connector. . The circuit arrangements of fig. 23 are also applicable to this provision. Similarly, it is possible to provide for the use of more than one level for the train of local switches and more than one level for connections to other exchanges by again employing the circuit arrangements of Fig. . 28.

We will now consider the question of intercentral operation.

The improvements in pulse transmission proposed in patent no. the reception of pulses, mass it is possible, when a repetition of the pulses is provided at several stages, for example at several exchanges of a number of exchanges connected, in series, that no pulse. can't reign at the other end.

So far a central hub has been considered and this hub has been set up to work within an existing network. In new networks greater flexibility is possible and it seems desirable to consider a pulse transmission system in which the present method of pulse repetition is avoided.

For this purpose, it is proposed that all intercentral pulse transmission should be of the alternating current type; mannen and monitor signals will still be On a continuous current basis as before, but pulses äRTI ID="0003.0275" WI="7" HE="4" LX="1733" Alternating current, preferably voice frequency, will be superimposed on the direct current signals to effect the actual movement of the selectors. In the case of tandem central units, the received alternating current pulses will be converted into direct current pulses, with the aim of placing the train of the electors in the tandem central unit in position and then the The necessary converter group will be disconnected and the rest of the alternating current pulse train will pass directly to the terminal exchange in the same way as for conversational currents, the direct current monitoring arrangements being maintained.

0n now refers to the basic repeater circuit starting, direct current/alternating current, represented in FIG. 24; when taken into service by a switching arrangement such as Gelle shown in fig. 23, the 1st relay 1A pulls in, followed by the 1st relay 1B which at contact Ibl replaces the free marking battery with resistor YX with a guard and holding ground, and at contact 1b3 extends, nm loop of relays D and I either of a normal type or of a thermionic tube type described in British Patent No. 551187, by the trunk conductors running from the right to the remote exchange.

When the DC loop pulse train is regulated, relay 1.f1 picks up and on each release capacitor QJ is charged by contacts lug and 1b2 to ground, while on each release new operation the relay <B>1 PU</B> is energized During the discharge time of capacitor QJ. Eu response to the train received, impulses. alternating current currents are extended by the conductors AC1 and AC2 and then by the contacts lpul, lpul and 1b3 towards the starting junction, the loop <I>D</I> and <I>I</I > remaining intact, or, in the case of the sensitive relay arrangement <I>D</I> and <I>I,</I> described in British patent no. insensitive During the application of each pulse to the lib e. With respect to resistor YW, the last resistor serves to slowly remove any residual charge from capacitor QY, when the start resistor releases subsequent to the end of inrush.

At the far receiving end, shown in FIG. 25, the 1st relay, 2A operates when the group of relays is @entered by the forward extension of the continuous current loop, but one will notice that relay 2B is not necessarily a real relay. at least, since relay 2A can only respond to DC monitor and hold signals and does not respond to subsequently received AC pulses, which may be received by a rectifier group RU , which may consist of a bridge rectifier 5, Dry Plate, followed by a small gas charging tube, in whose anode circuit the relay 2PU would be located, as described in greater detail in the earlier patent. As mentioned, this gas charging tube would be made to charge at the rising edge or at the falling end of each signaling wave and will remain stuck in the circuit until the 2PU relay has repeated at the ends. - 2ptel triggers a flickering pulse picked up at DC current by the negative wire to the associated incoming control relay group, which effectively forms a Part of the incoming relay group and which precedes the selector train, los contassts <I>h4 and</I> f7 being .co@ntacts of the H and F relays of the control relay group (see patent na 247351, fig. 22).

As soon as the group of control relays has directed the call to the called subscriber, the relay H in the group will be energized if this subscriber is found free, while the relay. G Will be executed if busy, as described in connection with the group of control relays in fig. both RTI ID="0004.0280" WI="6" HE="4" LX="1724" LY="143"> case, the first rectifier group is disconnected by additional contacts <I>lt</ I> or g - of those relays across the lines, which are ready for the transmission of speech or sound.

In the case of a tandem exchange, an incoming selector will suitably be similar to that shown in FIG. 23, except that the dot-dash rectangle will represent in this ras a group of Control Palaces, which combines the RU to alternating current reception arrangement of FIG. 25 and the normal functions of the control relay group in fig. 22.

The received AC pulses are converted into DC flicker pulses to actuate the tandem selector train through the control relay group, while the OG relay will be actuated as described in connection with FIG. . 23 to disconnect the modified control relay group when a tandem outgoing repeater is mim. in service. Subsequent AC pulses will then be extended through the outgoing repeater as shown in FIG. 24 and will pass through the 1st Stone bridge of the receiver comprising the 1st relay <B><I>LA,</I></B> the relays <I>D</I> and <I>I</I> and the capacitors QG and QH with the resistors of the respective contacts YT and YY set to the remote incoming relay group at the requesting exchange or in another tandem exchange in the same way as for conversation.

Several points should be noted in this arrangement: 1. No attempt has been made to preserve any relationship between the duration and Period of a pulse or between the closing and opening times. The pulse is only a Knock that initiates subsequent operations of the selector, and pays no attention to the ratio of the interrupt and close periods determined by the subscriber's transmit disk. The main use of 6misas pulses is that they are used to indicate the number of pulses in a train. This results from a combination of self-correcting magnets and speed adjustment.

2. No difficulty is encountered with the talk capacitors and furthermore the lead receiving the pulses is removed before a tone or talk is requested. This determines the position of the bridge preceding the First selector.

3. The system can be easily combined with long distance voice frequency installations. Where it is desired to operate through a dual wave or other wholly alternating current installation, arrangements are made in association with network outgoing lines for converting seizing signals. and monitoring in appropriate native AC equivalents. Disc pulses and drive pulses are shown unchanged.

Claims (5)

CLAIM Diepoktion of circuits for a selector switch, comprising pairs of cooperating contacts arranged in sets corresponding to the conductors of each feeder, these jaus being arranged in groups having different numerical meanings, and a single group of arms d actuation of contacts, said arms being able to move and select a group and a set of contacts in the selected group to produce the closure of the selected set of contacts, characterized in that in at least one group the corresponding contacts of the pairs of contacts of the different sets (upper part, fig. 23) are connected in multiple to each other and to incoming conductors, and that the corresponding contacts of the pairs of contacts of the different sets of at least: another group (Lower part, fig. 23) are multiple connected to each other and to outgoing conductors for a group of selector switch control relays. SUB-CLAIMS 1. Arrangement of circuits according to claim, characterized in that the contacts of the aforesaid first group, other than those connected together in multiple, are connected to junction lines, and that the contacts of the aforesaid second group , other than those connected together in multiple, are connected to lines leading to local selectors of the control unit. 2. Arrangement of circuitry according to claim 1, characterized in that the junction lines lead to a breast RTI ID="0005.0273" WI="12" HE="4" LX="1087" LY="557 "> group, while local lines lead to several groups each having a different meaning. 3. Circuit arrangement according to claim, characterized in that the incoming conductors are connected: directly to the multiple contacts of at least one group and through a control relay group to the multiple contacts of at least another group. 4. Circuit arrangement according to sub-claim 3, characterized in that the group of control relays is arranged to respond to direct current pulses generated locally at the central station in which the selector is located; and in that in response to a series of pulses indicating that a call should be established to a trunk line, a switching operation is performed to switch off the group of monitoring relays from the trunk lines. 5. Layout. circuitry according to sub-claim 3, characterized in that the group of monitoring relays is connected to an incoming line and clasped to respond to alternating current pulses, in order to complete a connection by the group of monitoring relays if the call is intended for a line connected to the control panel in which the control relay group is located, and independently of the control relay group if the call is intended for another control panel.