DE972597C - Circuit arrangement for telephone extension systems with dialer operation - Google Patents

Description

ISSUED AUGUST 20, 1959

S 40837 VIIIaJ2i a *

Franz Kappl, Munich

has been named as the inventor

with voter operation

The invention relates to private branch exchange systems in which illegal connections be prevented. In private branch exchanges, it is known that after a call over a trunk line, the private branch exchange operator controls the connection path to the desired extension and enter the authorization ID of the extension corresponding identifier is transferred to the switching means of the exchange transfer .by the inadmissible Connection the establishment of the voice connection path between the calling trunk and the selected intercom is prevented.

Not only trunk lines end with the same one at the workplace of the extension officer Characteristic, but connecting lines of different characteristics, and should only be connecting paths certain characteristics by the officer via clutch relay and a common Line are interconnected, so far the officer had to ensure that the interconnection ao Connection of lines with impermissible connections did not take place. This required mediation work the officer paid considerable attention to prevent unauthorized connections.

The invention aims at an extremely easy loading ^a 5 dienungsweise for the extension officer in the systems in which different place an official lines of communication characteristic end

909 581/6

and two of these paths only if the connection via coupling relays via a single line is permitted be connected to each other.

This is achieved according to the invention in that with the connection of the officer to a connection path the relays characterizing this connection path are switched on and these relays prevents the circuit of the coupling relay of the connection path with which an interconnection ίο the first-mentioned connection route is not permitted and prepare the circuits for the coupling relays of the connection paths with which an interconnection the first-mentioned connection route is permissible.

By the invention it is achieved that regardless of the thought work of the extension officer Interconnection of connection paths of an impermissible connection is prevented.

Another embodiment of the invention is that after the interconnection of two connection paths over the common line, where a permissible connection is interconnected is, the non-authorization identifier of a subscriber is effective via one of the two connection paths and through this indicator also in this case the interconnection of the two connection paths over the common line is prevented by the non-authorization identification the establishment of a holding circuit for the clutch relays is prevented for a calling station, which connect the connection paths to the common line.

An exemplary embodiment of the invention is shown in the drawing.

The two exchanges VSt 1 and VSt 2 are connected to one another via the line QL. In the case of a connection from the telephone station Ni of the exchange FSii via the line QL , the selector QW is set in a known manner. The feed bridge relay S is energized via the loop of the call station JVi. The following loop circuit now exists over the cross-connection line QL:

1. +, 1IXi, A2, ir, 2T2, b [QL, 3ur, ^ y, UE, GIi, 5s, 6y, a [QL,> jr 2, 8r, IZi, Ax, -.

Relays A1 and A 2 become effective. Relay V is switched on by relay A 2:

2. +, o.a2, V, -.

5 ^Q Relay A1 switches call relay J? 3 of the selection VW switched on:

3. +, ιοί, Dr, i2ai, I3M2, itf, R% -.

The relay R3 causes the preselector VW to be set to a free group selector GW.

If the subscriber of the telephone station Ni of the exchange VSt 1 wishes to be connected to a telephone station of the exchange VStz, the subscriber of the telephone station Nx selects the corresponding subscriber number. The individual series of current impulses are picked up by relay S and transmitted by contact for 5 s via line QL to relays A 1 and A 2 of the feed bridge at the incoming end of line QL. The relay A1 forwards the current impulses with contact 12αϊ to the receiving devices of the GW or a line selector that can be reached via the group selector.

If the establishment of a connection via the cross-connection line QL involves a call from an unauthorized intercom, an authorization identifier is transmitted via the line QL in this case. A call station that is not authorized for exchange connections is identified by the connection of potential at the connection contact for switching arm d of the selector QW . The relay TNi is switched on, so that earth potential is switched on to the α wire of the line QL via the contacts ιζίηι / ι6ίη2 . The differential relay Xi , located at the incoming end of the connection line and responding to the earth potential, puts the contacts in the working position. The relay XH is switched on:

4. +, 17 ai, i8 #, XH, -.

A holding circuit is established for relay XH:

, XH, -.

5. +, 17 «i,

The relay TN 2 is switched on by the relay TN1 in the exchange VSt 1:

TN%, -.

By opening contact 16 2 «2, the earth is switched off from the α wire of line QL. The differential relay Xi returns the contacts to the rest position.

The relay XH applies xh - \ - potential to the switching arm d of the preselector VW via contact 21 and thereby transfers the non-exchange authorization identification to the following group selector. If this group dialer is set to an outgoing exchange line, the establishment of the connection is prevented depending on the non-exchange authorization identification via contact 21 xh and a busy signal is transmitted to the calling station.

If the switchover to an interrogation line is to be initiated after the cross-connection line QL has been occupied , contact 3 ur is opened in some way and connected to the & -wire of line QL via contact 22 ur potential. The loop circuit 1 is interrupted at contact 3 «r. The following circuit now exists over the δ wire:

j. +, IIXi, A2, ir, 2r2, bjQL, 22ur, -.

The relay A ι drops out. If relay 41 has dropped out and relay A 2 is energized, the Z7i relay is switched on:

i. - \ -, 2301, 24α2, Ui, -.

If contact 22Mr is switched back to contact $ ur, loop circuit 1 is ^{generally re-} established. Relays A1 and A 2 are energized, differential relay X1 drops out. The circuit 8 is interrupted at contact 23αϊ. During the release time of relay Ui , relay U2 is switched on:

9. +, 25 v, 26ai, 27 «i, U2, -.

The following holding circuit is established for relay XJ 2:

10. +, 25V, 28w2, U2, -.

By opening the contacts 11 and 2/13 «2, the line @L is switched off from the VWjGW selectors. The line () Z, is connected to the interrogation line 31/32 via the contacts 29 «2/30« 2. The AL 2 call lamp is switched on:

11. +, AL 2, 33/2 :, 34 «2, 35g2, -.

After the AL 2 call lamp lights up, the officer presses the AT 2 query button. Relay AH2 is switched on:

12. +, LT, HU, AT2, AH2, -.

Relay K2 is made to respond:

13. +, LT, HU, 560Ä2, IK2, 35g2, -.

ao Relay K 2 remains independent of contact 56 «λ 2 via contact 57 k 2. Relay A 3 is switched on by relay AH 2:

14. +, 36ah2, Az, -.

a5 For relay B 1, relay A 3 creates a circuit:

15 +. 37 «3. Bi, -.

After relay B 1 has responded, the excitation circuit for relay AS2 is established:

16. +, LT, HU, 38CI, 39 & I, 4oah2, IAS2, -.

The monitoring lamp ÜL2 is switched on continuously:

τη. +, ÜL2, 54 «s2, -.

The relay V2 is switched on:

18. +, 58as2, IV2, -.

A holding circuit is established for relay V 2:

19. +, 59 ^ 2, IIF2, 60A2, 61 & 1, -.

The relay B 1 also creates a circuit for the Ci:

20. +, 4161, Ci, -.

At the contact 38 c ι the excitation circuit for the relay ^ 4S 2 is opened. After relay C 1 has responded, the following holding circuit exists for relay AS2:

21. +, LT, HU, 42CI, VT, 43US2, IlASz, -.

If the button AT2 is released, the circuit 12 of the relay AH2 is opened. With contact 30 «Ä2 the circuit 14 of the relay A 3 is interrupted. The relay V2 is now held via contact Ö2 «3. Contact 3703 causes relay Bi to drop. At the contact 41 b 1, the circuit 20 of the relay C1 is opened, so that this relay also returns the contacts to the rest position. For relay ^ iS 2 there is the following holding circuit after relays B τ and C1 drop out:

22. +, LT, HU, 38CI, 4461, VT, 43 «S2, IIAS2,

The officer’s BA apparatus is connected to the interrogation line 31/32 via the contacts 45 as 2/46 as 2. There is thus a voice connection between the calling station Ni and the officer BA.

If the call station via the line QL wants a connection z. B. with the continuing 7a line ALtg, the officer has to press the A T4 button. The relay AH4 is switched on:

23. +, LT, HU, AT4, AH4, -.

Relay A 3 is switched on by relay AH4:

24. +, 55 "A4, A3, -.

Relay B1 in circuit 15 is energized. The holding circuit 22 of relay AS 2 is opened at contact 4461. The relay AS 2 drops out. The monitoring lamp ÜL2 is switched on in the following way:

25. +, ÜL 2, 63 «s2, 64Ä2, 65 ^ 2, ι" -interrupter. _Sf

The monitoring lamp UL 2 thus indicates the hold state in a certain way.

When relay B1 is energized, relay .4 S 4 is switched on:

26. +, LT, HU, 38ci, 39 & i, 66 «Ä2, 67« A4, IAS4, - '. ^{9 <}

The UL 4 monitoring lamp is switched on continuously:

27. +, French 4, 68 «s4, -. _G

When relay AH 4 responds, relay K4 is switched on:

28. +, LT, HU, 6gak4, IK4, 705-4, -.

Relay K4 is maintained via contact 71 ^ 4, regardless of contact 6g ah 4.

When relay B 1 responds, relay C1 in circuit 20 is also switched on again. The relay Ci opens the excitation circuit 26 of the relay AS4 at contact 38ei. Relay AS4 is kept energized when relay C 1 is addressed in the following way:

29. +, LT, HU, 42CI, VT, 72 «s4, II ^ 4S4, -.

Relay V 4 is also switched on with relay AS 4 : "

30. +, 73 «s4, IF4, -.

The following holding circuit is established for relay V 4:

31. +, 74 ^ 4, UV4, 75A4, 61 δi, -.

The relay NSA is switched on by relay AS 4:

32. +, 76as4, NSA, -.

The officer BA is connected to the outgoing line ■ ALtg via the contacts 77 as 4/78 as 4, ia 79? / S / 8oüs and 81 nsa / 82 nsa .

When the AT4 button is released, circuit 23 of relay ^ 4Zi4 is interrupted. It is brought to the contact 55 "A4 relay A 3 to waste. The hold circuit for relays V2 and V4 becomes independent

from contact 6i δ ι, via contact 62 «3 maintained. After the relay A 3 drops out, the circuit 15 of the relay B1 is opened. The relay B 1 interrupts the circuit 20 of the relay Ci at contact 41 δ ι. After relay Ci has dropped out, relay AS4 is kept energized in the following way:

33. +, LT, HU, 38CI, 44Ö1, VT, 72as4, IIAS4, -.

When the relay AS 2 drops out, the officer is disconnected from the interrogation line 31/32. The bridge relay S1 drops out. The connection path via the line QL via the contacts 83 s 1 / 84S1 is connected to the line L 2 in preparation.

The officer establishes the connection via the ALtg line. To interconnect the incoming line QL with the outgoing line ALtg , the officer presses the button VT. The holding circuit 33 of relay .4S 4 is interrupted. The relay NSA is switched off at contact 76 «s 4 ao and the lamp ÜL 4 at contact 68 as 4 . The following circuits are created for the relays FS 2 and VS 4:

34. +, LT, HU, 38CI, 4461, VT (in working position), 857) 1 or 86Ä1, 87 ^ 2, IIif2, 887) 2, IFS2, -.

35. +, LT, HU, 38CI, 44δΐ, VT (in working position), 857) 1 or 86A1, Gl% 897) 3 or 90Ä3, 91Ä4, IIif4, 927) 4, I FS4, -.

A holding circuit is established for the relay FS 2:

36.

II VS 2, G2,

The following holding circuit exists for the FS 4 relay:

37- +, 95 ^, 96DS4, II VS 4, G4, -.

The lamp AL 2 is switched off at contact 35 g 2 and the excitation circuit 13 of the relay if 2 is opened. The excitation circuit of relay if 4 is interrupted at contact 70g4. When the VT button is released, the excitation circuits 34 and 35 for the relays FS 2 and FS4 are interrupted. The line L 2 is connected via the contacts 97 7) s 2/98 T) S 2 and the line L 4 is connected to the common coupling line VL via the contacts 99 vs 4/100 7) s 4. The connection path is therefore from the line @Z. produced via the coupling line VL with the line ALtg . With the relay G 2 switched on in the circuit 36, the interrogation line 31/32 is disconnected from the line QL by opening the contacts ioig2 / iO2g2.

When relay G 4 is switched on in circuit 37, contact iO3g4 is opened and the output from group selector GW or access to group selector GWi is switched off.

If the excitation circuits 34 and 35 for the relays FS 2 and FS 4 are interrupted by returning the connection key VT to the rest position, the relays if 2 and if 4 also switch the contacts back to the rest position. The lamp UL2 is switched off at contact 64Ä2. The holding circuit 19 of the relay F 2 is opened at the contact 60 k 2. The relay F2 drops out. When relay if 4 drops out, on

Contact 75Ä4 of the holding circuit 31 of the relay F4 opened, so that this relay also returns the contacts to the rest position.

If the connection via the lines ζ) / - and ALtg is interrupted, both relay A 1 and relay ^ 2 drop out when the loop at the contact opens for 5 s. At contact 902 the circuit 2 of relay F and at contact 257; the circuit 10 of the relay U 2 is open. Relay Tr is switched on temporarily during the release time of relay U2:

38. +, 1042 * 2, 1057 ;, io6t; s2, Tr -.

By opening the contacts 93 ir and 95 tr , the circuits 36 and 37 are opened. Relays FS2 and G2 and relays FS4 and G4 drop out. After relays U2 and FS 2 have dropped out, the circuit of relay Tr at contacts 106 vs 2 and 104M2 is interrupted. The facilities that have been used are again in the rest position.

In the embodiment shown, not only the connection of the line L 2 / L 4 via the common coupling line VL is possible, but also a simultaneous connection of the two lines L 2 and L 3 held in circuit 36. After pressing the query button for the line L 3, the relays K 3 and _go F 3 are switched on. Only winding II of relay if 3 is shown in the drawing. The following circuit is established for the relay FS 3 assigned to line L 3 using the connection button VT:

39. +, LT, HU, 38CI, 44 & I, VT, 8501 or 86 * i,

, 124A3, Π2? ₃ , I25W3. H ⁷ S

For the relay FS 3, a corresponding holding circuit (not shown) running over a winding II is produced. _lot >

A simultaneous connection of the lines *! 1 and L 2 to the common coupling line VL is prevented. The relays K τ and Fi assigned to the line L 1 are energized. In the drawing, only the winding II of the relayifi and winding I of the relayFSi is shown. For the line L 2, the relays if 2 and F2 are in the working position. When the VT key is pressed, the FSi relay is switched on:

40. +, LT, HU, 38CI, 44 & I, VT, 126Ä1, Hifi, 1277) 1, I FSi, -.

Since the relays Fi and if 1 are excited, the contacts 85 ν i / 86 k 1 are open. The excitation circuit 34 cannot be established for the relay FS 2. The rectifier Gl 3 prevents the relay FS2 from being controlled via contact 128 kl and rectifier Gl 4. Since the relay FS 2 cannot be energized, the relay G 2 also remains idle and thus the call iac lamp .4X 2 in the circuit 11 switched on. This is how the officer recognizes an attempt at an inadmissible interconnection. By pressing the delete key LT , the devices that have been used are returned to the rest position. The officer can contact the

connect the conference units involved in the connection.

An interconnection of the lines L ι and L 3 is possible. In this operating case the relay FSi the line Li in circuit 40 and the relay FS 3 switched on via the following path:

41. +, LT, HU, ₃ 8cx, 44bx, VT, xa & kx, GI4, 124 ^ 3, II K ₃ , I25T / 3, I VS ₃ , -.

It is also possible to connect lines Li and L 4 to the common coupling line VL at the same time. In this case the relay VS χ in the circuit 40 and the relay FS 4 are energized in the following way:

42. +, LT, HU, 38CI, 44 & I, VT, 128Ä1, GI4, 891/3 or 9Ο & 3, 91Ä4, II K4, 921/4, I FS4, -.

A simultaneous connection of the lines L 3 and L 4 is again prevented by the open contacts 89 2/3/90 £ 3. In this case, only the relay FS 3 can be switched on via circuit 39. The relay FS4 remains idle. The call lamp is switched on again on the corresponding calling line, since the corresponding relay G remains idle. The officer returns the relays that have been used by pressing the delete button LT to the rest position and again connects to the intercom stations involved in the connection. A connection path that has been used is then triggered in the manner already described.

Claims (7)

PATENTA N PROPOSALS: i. Circuit arrangement for telephone extension systems with dialer operation, in which an officer connects two of several connection paths via coupling relays and a common line, characterized in that when the officer is connected to a connection path, the relays (VxjKx) that characterize this connection path (Li) are switched on and these relays (VxJKx) prevent the circuit of the clutch relay (FS 2) of the connection path (L 2) with which an interconnection of the first-mentioned connection path (Li) is not permitted and the circuits for the clutch relays (FS3 / FS4) of the connection paths (L ₃ JL 4) with which an interconnection of the first-mentioned connection path (Li) is permitted. 2. Circuit arrangement according to claim 1, characterized in that a common auxiliary line for controlling the clutch relays (FSi to -BS 4) of all connecting paths (Li to L 4) and in an auxiliary path for controlling the clutch relays for the connecting paths with which an interconnection via the common line (VL) is permitted, rectifiers (G / 3 / G / 4) are switched on, which prevent reverse control of the corresponding clutch relays (FS 2). 3. Circuit arrangement according to claim 1, characterized in that the clutch relays (FSi to FS 4) are controlled by actuating a common button (VT). 4. Circuit arrangement according to claim 3, characterized in that the connection relay (AS 4) and the relay characterizing the connection path (V 4JK 4) of the connection path in the interrogation state (L 4) and the relay characterizing the connection path are through the common key (VT) (V2 [K2) of the connection path (L 2) in the hold state are brought to waste. 5. Circuit arrangement according to claim 1, characterized in that a holding circuit dependent on the existing connection is established for the clutch relays (FS2 / FS4) of the connection paths (L2 / L4) connected to the common line (VL). 6. Circuit arrangement according to claim 5, characterized in that the coupling relays (FS2 / FS4) of the connection paths (L2 / L4) connected to the common line (VL) are brought to waste by the triggering stimulus of a call station. 7. A circuit arrangement according to claim 5, characterized in that switching means (relay XH) which prevent the production of the holding circuit for the coupling relays (FS2 / FS4) of the connecting paths (L2 / L4) come into effect through a non-authorization indicator calling stations. Considered publications:
German Patent No. 882 579;
Swiss Patent No. 234468. 1 sheet of drawings © 509629/112 1.56 (909 581/6 8.59)