DE578409C - Circuit arrangement for busy counting in telephone systems with dialer operation - Google Patents

Description

ISSUED ON JUNE 13, 1933

REICH PATENT OFFICE

PATENT LETTERING

JVe 578409 CLASS 21 a 3 GROUP 66 to

Patented in the German Empire on June 28, 1931

In telephone systems with dialer operation, a relatively large proportion of the connection devices are required in the rush hour to set up those connections that remain unsuccessful as a result of the busy lines. In order to reduce this undesirable load on the dialer as far as possible, the public offices continuously check the subscriber lines and, if a connection is found to be busy too often, the subscriber must have another connection line set up.
In order to count or register the busy calls, various solutions have already become known, but the current source present for the entire dialing device is always used for the excitation of the switching means which initiate the counting. This results in a certain complexity of the circuit arrangements, because any current branchings which interfere with the existing connection must be avoided.

The present innovation thus makes known to solve the above-mentioned problem in a simple and expedient manner in that a special small auxiliary sbatterie is used to excite the busy counting or initiating switching means. In the event that the occupancy is only to be counted but not registered, the entire test device consists only of the counter and the auxiliary battery together with connection devices (test plugs, terminals). If a registration is to take place, the switching means initiating this is also excited by the auxiliary battery. The registration device itself is operated by the power from the common office battery. After appropriate insertion of a switch means can be provided which selectively counting or registering the loading ₄ g call is made possible. Fig. 1 in connection with Fig. Ia and Fig. Ib shows an embodiment of the invention.

The mode of operation of the device is explained in more detail below. It's just the, " to understand the invention necessary devices shown. The group of last number surge receiver, via which the connection lines to be tested are, as is well known, with test relay records for the purpose of carrying out the test to equip, which however differ from the usual relay sets only insofar as than the high-resistance winding II of the

* ) The patent holder has indicated as the inventor:

Arthur Mehlis in Berlin-Lichterfelde,

Test relay P, P ₁ is bridged by an additional contact ^ v ₁ , 3V _11. In addition, the test plug PSt must be inserted into a test pawl PK or PK ₁ .

If a participant on the lines <a _v O ₁ access to the last. Number current impulse receiver LW _{1 has} found, the following circuit is established: Earth, ... (this indicates the test equipment of the previous selection level), line C ₁ , head contact 1 U _{1 of} the selector LW ₁ , relay V ₁₁ , resistor W ₁₁ , - .

Relay F ₁₁ responds, closes a holding _{circuit for itself via contact 1 ^ 11} and prepares the test circuit for relay P ₁ , winding II by moving its contact 2 ü _u , while at the same time opening its contact 32 ^ ₁₁ . The relay A _{1 is} energized via the voice cores Ci ₁ , b _x in a manner not shown. Furthermore, relay ^ is switched on via contact 4W ₁₁ : earth, contact 4 ^ ₁₁ , contact 1 P ₁ , relay S ₁ , resistor ^ F ₁₂ , -.

Relay .S ₁ switches its contact 2J ₁ and thus prevents relay V _{12 from} responding if head contact 2 k _{x is closed} when LW ₁ is set. The subscriber now sends the first series of numbers to the line selector. The relay A ₁ acts as a rush relay and first controls the lifting magnet of the LW _{1 in a} manner not shown. After the end of the first series of impulses, relay ^ ₁ drops out, since it is now short-circuited over the long-term closed contact Xa _{1 of} the impulse relay and the closed head contact 2 k _{t of} the selector LW _1. This also causes contact 2S ₁ to return to the rest position, and relay V ₁₂ is energized via: -, ReIaIsF ₁₂ , contact 2S ₁ , head contact 2 k _t , contact 1 p _lt contact 4V ₁₁ , earth.

The second series of impulses now acts (relay F ₁₂ is used in a known manner as a reversing relay) on the rotary magnet of LW ₁ . When relay A ₁ drops for the first time, contact 1 U ₁ is opened again, so that relay S ₁ responds again and, by opening its contact 1 S _1, prevents premature testing. Relay F ₁₂ holds the meantime continue on: - Relay F _12, contact 2V _12, contact Zk _1, contact Ip _1, contact 4W _11, Earth.

After the end of the series of impulses, relay S ₁ is short-circuited again and initiates the test via relay P ₁ by closing contact Is ₁ . Is the participant, e.g. B. 5, free, the following circuit is called: earth, contact 2V ₁₁ , contact 1 V ₁₂ , contact 1J ₁ , relay P ₁ , winding II, c-arm of LW ₁ , line 1 C ₅ , relay Tr ₁ , -.

The responsive relay P ₁ switches its low-resistance winding I to the c-arm via contact 2 / I ₁ and separates the circuit for relay F ₁₂ at contact 1 P ₁ , which drops out and, in turn, winding II of the at contact 1 V ₁₂ De-energizes test relay P _1. Relay P _{1 also} switches the speech wires to the desired subscriber station at contacts 3 P ₁ and 4 ^ ₁ (calls, disconnection and powering of the desired speech station are carried out in a known manner. The necessary switching means are behind the capacitors K ₁₁ , K ₁₂ on the speech wires indicated by ...). Relay T ₅ connects line 1 c ₅ with line C ₅ 'at contact r t _s and thereby to the busy counter.

If a second participant who has received access to the voter LW via the lines a ₂ , b ₂ also wants to have a conversation with the intercom 5, the same switching means come into effect, as already described above, until the voter LW is set to line abc _s . Relay P also checks the subscriber _{relay T 5} via its winding II and lines c _Sl vc _s . However, it cannot respond via its high-resistance winding II, since the connection is blocked by the low-resistance winding I of the relay P _{1 connected in parallel.} As a result, relay F ₁ remains short-circuited for a long time via the contact / ;, 3j and shaft contact W ₀ , so that / there is a drop and the high-resistance winding II of the relay P short-circuits _{at contact 3W 1.} Since relay F _{2 has a} delayed dropout, it remains energized for a short time, despite the fact that the current is withdrawn _{from contact 4 ^ 1.} Characterized the following circuit is created: auxiliary battery HB +, counter Zä, testing stoppers PSt, suspension of the test jack PK _1, line pk, contact 2V _1, contact 1 V _2, Contact 1 j, contact 3 V ₁ (Fig IA). c-arm of the selector LW, line C ₅ , line vc ₅ , contact 1 1 ₅ , line C ₅ ', auxiliary battery HB -. The counter z comes into effect in this circuit. Relay F ₁ had also closed its contact S ^ ₁ and thereby completed the circuit for the release magnet M of the selector LW : -, release magnet M, contact 3 k, contact Sw ₁ , contact 6 p, earth. The selector LW is triggered again. If not only a simple counting of the busy occupations is to be carried out, but a registration of the same is desired, then instead of the device according to Fig. La a device according to Fig. 1b is to be provided. Here, .S means a switch to be changed by hand, RA means a registering ammeter. With simple counting, the switching operations are the same as those described above.

wrote immediately. ' It is only in the circuit at Aufprüfen a subscriber to a busy line instead of the counter initially counters and a counter relays Z effect, which in turn via its contact ι s and contacts and 2 of the switch S turns on the counter Zä.

If the continuous registration of all connections established by or to the speech station 5 (including the busy occupancy) is desired, the switch S must be thrown. If the subscriber 5 wishes to speak outgoing, the relay R is energized after lifting the receiver via: earth, relay R, winding I, contact 3 t ₅ , line b _5l line vb ₅ , call station 5, line va ₅ , line a ₅ , contact 2 t ₅ , relay R ₁ winding II, -.

Relay R closes its contact 1 r and

This energizes relay T ₅ , line ι C ₅ , contact 1 r, line c ₅ , contacts 4 and 6 of switch S, relay Ab, high-resistance winding I, earth, the relay Ab. This responds and switches via contact 1 off and the resistors W ₃ , W ₄ , W ₅ the registering ammeter RA . The search selector AS, which has now been started in a known manner by the relay R, checks when checking the calling line via earth, windings I and II of the relay PA, c-arm of the AS, line ve /, line c ₅ ', relay T ₅ , - and blocks the subscriber line immediately by short-circuiting its high-resistance winding II at the ipa contact. (It should be noted that the winding I of the relay Ab is so high that relay PA can easily check in parallel.) Now that the low-resistance winding I of the relay PA is connected in parallel to the high-resistance winding I of the relay Ab , the latter would return to the rest position and the registration at the contact 1 from interrupting. This is prevented by the fact that relay An now responds in parallel to relay T ₅ via the low-resistance winding I of relay PA : -, relay An, contacts 9 and 7 of switch S, line pr, contact ir, line C ₅ ', line Vf ₃ ', c-arm. of the selector AS, contact ipa, low-resistance winding I of the relay Pa, earth. Relay An connects to its contact ι, so that Relay Ab continues through its second winding: -% Relay Ab winding II, contact lan, contact 2ab, earth. This circuit remains in place for the duration of the conversation, so that the recording ammeter RA also makes a corresponding recording. If a line selector LiF or LW ₁ checks the connection during the call, the relay Z is energized when checking the occupancy and temporarily short-circuits the resistors W ₃ and W ± at contact s , so that an increased current is generated via: Earth, contact z, contacts 1 and 3 of switch S, resistor W ₅ , recording ammeter RA, - flows through the recording instrument. After the end of the conversation and triggering voter relays From time to fall off again, so that all parts of the recording device are back in the rest position.

If subscriber 5 is called via LW ₁ , relay Ab cannot respond via its high-resistance winding I, since relay P _{1 is} already connected to relay T ₅ with its low-resistance winding I before relay Ab is connected to contact 1 1 ₅ via wire C. ₅ 'is also connected to minus _{via relay T 5.} Relay Ab remains idle and only relay An is triggered via: Earth, contact 4W ₁₁ , relay P ₁ winding I ₃ contact Ip ₁ , c-arm of ZW ₁ , line Ic ₅ , line /)? -, Contacts 7 and 9 of switch 6 ", relay on, -.

Relay An switches on the registering ammeter RA , bypassing the resistance W ₃ via: earth, contact ^ off, contact 2an, resistors W ₄ , and W ₅ , registration ammeter RA, -.

In this case, the measuring instrument receives an increased current, so that the registration curve makes it easy to see whether the subscriber is engaged in an incoming or outgoing call. When setting another line selector, e.g. B. LW, on the busy subscriber line · again responds to relay Z and causes a further deflection of the measuring instrument RA by short-circuiting the resistor W \ via its contact z. The resulting registration curve is shown schematically in Fig. 2. The curve shows at a that the part. The recipient was in an outgoing call, while the corresponding recording at b indicates an incoming call. At c an outgoing call is also recorded in which the subscriber, as indicated by tip 1, was once found busy, while at d an incoming call with two busy no tests (tips 2 and 3) was recorded.

Claims (3)

Patent claims: i. Circuit arrangement for traffic monitoring in telephone systems with Dialer mode which counts the busy status of a line to be monitored, characterized in that, that a special power source to excite the counting or registration effecting switching means arranged in the test wire is used. 2. Arrangement according to claim i, characterized in that the triggering of the voter checking for the occupied line is initiated only by the switching means (V ₁₁ , V ₁ ) closing the counting circuit. 3. Arrangement according to claim 1, characterized in that a changeover switch (S) is provided which allows the optional activation of the counting or the registration of busy calls causing devices. 1 sheet of drawings