DE1095323B - Circuit arrangement for a telephone system with dialer operation and connection traffic between private branch exchanges - Google Patents

Description

The invention relates to a circuit arrangement for a telephone system with dialer operation and Connection traffic between private branch exchanges in which when a certain number of certain Lines further connections via other lines are prevented.

Circuit arrangements are known in which, after a certain number of trunk lines have been occupied, blocking switching means are switched on, which prevent the seizure of a further trunk line in the outgoing direction. An embodiment of this type is such that when all the trunk lines are occupied, switching means become effective which prevent the seizure of a further trunk line until a certain number of trunk lines, e.g. B. 2D ⁰ I ₀ , are enabled again.

The invention now relates to such telephone exchange systems, in which the incoming cross-connection lines via the connection devices assigned to the cross-connection lines and the so-called branch lines are connected to the connection devices of a private branch exchange.

The invention is based on the object, in systems of the aforementioned type of the total number of existing Only release a certain number of branch lines for connection traffic, when the branch lines are used for various connections.

This is achieved according to the invention in that both when occupying a branch line for outgoing Connections and when a branch line is occupied for incoming connections as well as for the Use of a branch line for inquiry connections assigned to the named branch lines, Switching means that identify the occupancy status, the identification of the number of all occupied branch lines cause in a device jointly assigned to the branch lines and at the same time Activation of a certain number of the occupancy status of the branch lines mentioned Switching means Blocking switching means effective to prevent the occupation of another line will.

This arrangement creates the possibility in a simple manner of simultaneously assigning the number Limiting branch lines for outgoing, incoming and inquiry traffic. This limitation to a certain maximum number of simultaneous vouchers Branch lines for outgoing, incoming and inquiry traffic can be added to any existing system be recreated.

In the drawings, an embodiment of the invention is shown. It's just those for understanding of the invention shown important details. It shows

Circuit arrangement for a

Telephone system with dialer operation

and connection traffic between

PBXs

Applicant:
Siemens & Halske Aktiengesellschaft,

Berlin and Munich,
Munich 2, Witteisbacherplatz 2

Erich Abt, Munich,
has been named as the inventor

Fig. 1 shows an overview plan for handling the telephone traffic between the private branch exchange N-Al and the private branch exchange N-A2 via the branch lines for outgoing traffic (GLl to GLx), via the branch lines for incoming traffic (K Ll to KLx) and via the branch lines for inquiry traffic (RLl to RLx), of which one line for outgoing traffic (GLl), one line for incoming traffic (.KXl) and one line for inquiry traffic (RLl) together form a branch line (Az-Ll) ,

Fig. 2, the cross connection lines QLL and QL 2 associated operating transmissions B-UEI and B-Ue2 and the operation transfers B-UEI and B-UEZ associated voter means Wel and WE2 and the branch lines Az-Ll to Az-Lx associated switching means and together assigned facility GEl,

3 shows an alternative solution for the device GE2 which is jointly assigned to the branch lines Az-Ll to Az-Lx .

The subscriber of the extension 2Vl in Fig. 1 occupies the preselector VWl in a known manner by lifting the receiver of his telephone station and establishes a connection with this extension by dialing the subscriber code of the extension N2.

By means of the office identification, for example by dialing the code number 0, the extension TV1 is connected in a known manner to the exchange transmission A-UeI and the exchange line A Ll .

By choosing one of the code numbers, e.g. B. 7, 8 or 9, the extension TVl occupies the branch line Az-L 1

009 679/110

3 4

for an outgoing connection. This outgoing communication B-UeI by closing the connection comes via the outgoing line GL1 to tact 19yl brings about the inquiry identification. That stands. The selector GW2 coupling relay All of the selector device WE 1 assigned to this line GL 1 is occupied. You can switch by dialing another code:

a free transfer of operations, e.g. B-UeI, the cross-5 ₁ . < _Odi . »Η- _{νΛΛ Γ} ^ _{ΛΛ O1} , _{Λ οο Λ lir} - * _e

, .j,., " _Γ4 j · χτ τ. λ. λλ ι λτ λ ^ ^ι +> ¹ ^ ¹ . ^ UzI, KIl, GrIl, 21σ1,22α1, WiIS, -. Connection line QL 1 to the private branch exchange NA 2

proven. That of the outgoing occupied line GLl to- For the relay Z 1 comes the following circuit

Ordered occupancy relay G 1 is set up with the occupancy:

switched on and held as long as this line ₉ , _{1Q 1 71}

tungGLl is occupied. io ^ ^{+> LVy1} ' ^Z1> ■

With an incoming connection from the secondary The relay A 1 is activated by closing the contact

switchboard system NA 2 switched on via the cross-connection line QL1 23r 11,

the transfer of operations becomes B-UeI and thus, if 3, 09hl Al (I) 23/11 i? ll -

it is not through traffic, the long-distance '' ''

group selector FGW occupied in a known manner. 15 The coupling relay R 11 is in this circuit

Hold by dialing the subscriber code of the desired. The winding I of the relay B1 is the winding

Extension is the branch line Az-L 1, arriving treatment II of the relay B 1 opposite, so that the

via the remote group selector FGW, ie the incoming contacts of this relay through the following circuit

Line KLl, occupied and the line selector LWl not operated:

eg set to extension N2 . That of the an- 20. _o «.. _{ö1 m} ~ _n 1 ui ητ \

-t 111. τ ■, - rr -τ Λ Τιτ-11-τ ^ Λ * · ΊΓ t "30 X, LJ X (II, OU ti λ, £ J X til),.

Incoming assigned line KL 1 assigned relay Λ1

is switched on for the duration of the occupancy of this line. Closing the contacts 25Kl to 28rll is switched. the line RLl to the inquiry preselector RVWl is switched through an inquiry by the calling extension. Verbinz remains during the inquiry. B. 2Vl, or the called extension, e.g. iV2, 35 training via the cross-connection line QLl to the secondary required, the extension causes in a known branch system NA 2 (see the cores al and δΐ formed query identifier for the corresponding occupied loop via the contacts 68al and 6961 held. Transfer of business, e.g. B-UeI. By acknowledging the inquired extension, the question identification is the assigned operating transmission 30 relay Bl by connecting negative potential to the transmission B-UeI assigned dialing device WEl line TBLl, ie short-circuiting the winding I of the occupied and the connection with a branch line for relay Bl, switched on.
a consultation connection, ie with a free consultation r, _{TBM 4J} on 1 _D i πτ \
ask management, e.g. B. RLl causes. This connection

comes through the contact irll and the in the operational 35 The requested extension takes over the call,

ready state of the branch line plugged in by pressing the earth button through this

bar 10. Through the transfer identifier, the extension is used in the occupied operational transfer switching

effective between the intercom station via the medium, which the relay Ul, not shown

Switch on inquiry line RL 1 of branch line Az-L 1. The winding II of the relay Al, which the

the contacts Ir 11, 10 and the Querverbindungslei- 40 winding I of the relay Al is connected in the opposite direction

tung @ Ll establishes a connection with the extension that is switched on by closing contact 31 ul .

Annex N-A2 produced. 6. +, Al (II), 24rll, 31ul, WiU, -.

The relay Gl, which is the outgoing occupied line Gill, or the relay if I, which is the incoming For the relay Bl and the coupling relay R 11 is occupied line KLl, or the relays Al and Bl, 45 after switching off the relay Al The following stop points are assigned to the RLl line, create a circuit:

Marking for the common, all junction ₇ , TRTi wire B1 m / Mm 23rll

GE 1 or G2i2 device assigned to lines (see All -
Figs. 2 and 3). The common facility causes at

simultaneous occupancy of a certain number of 50. After the transfer of the connection mentioned arises

Branch lines for outgoing and incoming thus the switching status: Relay Bl in circuit 7

Traffic to the private branch exchange 2V- ^ 4 2 switched on and the contacts of relay A 1 in the

of blocking switching means to prevent a further rest position.

Occupancy. The connection of the requested extension with

55 of the inquiring extension is triggered and the

1. Establishing an inquiry connection queried secondary control is via the inquiry line ALI and the cross-connection line QL 1 with

On the basis of Fig. 2, the individual switching stations of the private branch exchange 2V- ^ 4 2 (cf.

processes when a free line RLl Fig. 1) is occupied,

received for inquiry traffic. 60 Each outgoing line of a branch line, e.g. B.

Each transfer of business, e.g. B. B-UeI, the Querver- Az-Ll, is an occupancy relay, z. B. the outgoing

Connection line <2 £ l to the private branch exchange 7V- ^ 42 line GLl the relay Gl, every incoming line

(see. Fig. 1) a selector device WEl is assigned, a branch line, e.g. Az-Ll, is an occupancy

through the relay when receiving a query indicator, z. B. the relay Kl assigned to the line KL1,

a free one to line RL1 for inquiry traffic. 65 These relays indicate the occupancy status. the

split selector RVWl of the private branch exchange N-A1 assignment of the inquiry line RLl of the private branch exchange

(see. Fig. 1) is occupied. system NA 1 (see Fig. 1) for an outgoing or

If the calling or called extension activates the incoming connection with the private branch exchange of the private branch exchange N-A 1 (see. Fig. 1) the return 2V- ^ 42 (see the busy 70 line i? ll after the transfer identifier is through

5 6

the state: Relay Bl switched on and the contacts The contact 74m is brought into the rest position. That

of relay A in the rest position. Relay Sp is for example in the following circuit

2. Monitoring of the total number of lines that can be used at the same time by means of a bridge arrangement ₅ 10 · +. 336, 32al, 74m, Sp, -.

Each outgoing and incoming line, e.g. B. The contacts of this relay Sp switch the

GLl and KLl, and relays assigned to each inquiry line, for example RLl branch lines Az-Ll to Az-Lx

the branch line Az-Ll is a resistor WiZ or SpI to Spx a.

Assigned to WiI or Wi2 . The resistances WiI to ^, ^ l j yg _s , j ^ -jg _ Wi9 of all outgoing and incoming lines GLl io

to GLx, KLl to KLx and inquiry lines RL1 l ² · +> Sp2, 76sp, Wil7, -.

to RLx are connected in series and in the idle state 13. ^. ^ spx, 76sp, Will, -. through contacts of the aforementioned, the lines and

Relay assigned to the inquiry lines short-circuited. The contacts 86s ^> l, 87s ^> l, 88s ^> 2, 89sp2 to 9Ospx These series-connected resistors WiI to Wi9 15 and 9lspx are opened. Those already switched on are arranged in a branch of a bridge circuit. Relay G of the outgoing occupied lines and K of In the other branch of this bridge arrangement, the incoming lines of the branch lines certain fixed resistance PFiIl is switched on. Im remain switched on, eg the relayG2 remains switched on via the zero branch of the bridge circuit, a polarized contact 64 ^ 2 is switched on. The contacts 86s ^> l relay Ü switched. Instead of this relay U , however, 20 to 91 spx can prevent further occupancy of a transistor-arranging or incoming line for a connection, which is also not shown. connection via a cross-connection line between the

When a line GLl or KLl or a private branch exchange N-Al (see. Fig. 1) and the branch

Consultation line RL 1 for a connection to the station system N-A2 (see. Fig. 1).

Private branch exchange NA 2 (see Fig. 1) is the short 25

terminate the canceled extension corresponding to the occupied line in the manner already described

Status canceled. Transfer of the call to another extension

In the execution described in section 1 are initiated. In this case, instead of the example, after the transfer identification by the outgoing or incoming line, a back-opened contact 3461 and the contact 35al, which is in the idle position 30, the short-circuit of the counter-system N-A2 (cf. . Fig. 1) is used. The entire number of booth Wi2 is canceled. If this resistance is Wi2 of the resistors switched on in the bridge branch, the only switched on resistor remains the same for all of the series.

switched short-circuited resistors Wi Ibis Wi 9, as soon as a line, for example the outgoing one, is occupied

so the inquiry line is also the only outgoing line GL2, becomes free, the corresponding relay G2

Branch line, which is used for a connection between the switched off. The resistance Wi6 is through again

Private branch exchange N-A1 (see FIG. 1) and the auxiliary contact 55 g2 short-circuited. The relay Ü is

Location system NA 2 (see. Fig. 1) is occupied. The polar- polarized in the opposite direction. The contact

sated relay Ü in the zero branch of the bridge circuit is opened 74m. The relay Sp (circuit 10) and

thus via the bridge branch with the lower resistance 4.0 thus the relays SpI to Spx (circuits 11 to 13)

Wi2 was switched on. are switched off, and another outgoing or

8 + 33 & 1 32 «1 52Ä1 Wi2 53 ^ 1 54Ä2 50 & 2 incoming occupancy of a branch line is again

55 ^ 2, 56 £ #, 57bx, 59gx, WiIO, Ü, WH2, -. ' possible. This ensures that only a certain total number of outgoing lines are arriving.

In the assignment of a further line of a branch-off 45 of the lines and inquiry lines of the branch line for connection between the PBX lines at the same time for outgoing and incoming plant N-A1 (see. Fig. 1) and the PBX traffic to the PBX NA 2 (cf. 1) N-A2, for example the outgoing line GL2 in FIG. 1, can be laid. If all occupied branch lines are free, the relay G2 shown in Fig. 1 and 2 is switched on via all resistors assigned to these lines, the contact 88s ^ 2 in Fig. 2 and holds 50 PFiI to Wi9 again short-circuited. The relay Ü is via the contact 64g2. The short circuit of the resistor (circuit 8) is switched off again. Prior Wi6 is by opening the contact 55g2 The release of the folded Veraufgehoben described. Are a certain number of resistors binding is connected in series in a known manner, not shown, for example ten resistors, initiated. Solves, for example, the inquired secondary, if another line, z. If, for example, KL2 of the switch-off 55 is switched off first, the holding circuit 7 of the branch line Az-L2 is interrupted for a connection between the relay B1 and the coupling relay R11. Private branch exchange iV- ^ 413 (see. Fig. 1) and the secondary The triggering incentive is transferred to the private branch exchange iV- / 12 (cf. branch exchange N-A2 (see. Fig. 1), a white- Fig. 1).

Another resistor, the resistor Wi 4, by opening the switch points 116 and contacts 54 & 2 of the 60 117 assigned to this line KL2 , a transistor relay K2 can be switched on instead of a relay arrangement. By switching on this arrangement it is switched on in such a way that one in the collector resistor PFi4 is but the bridge branch, in the circuit switched on relay is only switched on, already ten resistors are switched on, if in the zero branch a current in a certain, through ohmic than the bridge branch in which the resistor rectifier flows in the specified current direction. Will is on. The current in the latter 65

Bridge branch becomes larger than the current in the first-mentioned 3rd monitoring of the total number of bridge branches. The current flows through the polarized, simultaneously assignable lines by means of a counting chain relay U in the opposite direction according to the following circuit: By a relay counting chain arrangement (relay L> 1 9. +, 33δ1, 32 «1, PFiIl, Ü, Wi 13, -. 70 to D5 in Fig. 3) is an outgoing for each occupancy

I 095

Line, eg GLl, incoming line, eg KL 1, or inquiry line, z. B. RL 1 of the branch line Az-Ll, for an outgoing or incoming connection, a further relay of this chain is switched on and when a line becomes free, the relay of the chain that was switched on last is switched off again. If, apart from one line, the maximum total number of outgoing, incoming and inquiry lines for connection traffic between the private branch exchange N-A1 (cf. Fig. 1) and the private branch exchange N-A2 (cf. occupied, a blocking relay Sp is switched on in accordance with section 2 to prevent further seizure of an outgoing or incoming line.

The load connected to the drawn in Fig. 2 connection points 115-131 joint device gel and the branch lines Az-Ll and Az-L2 be the one shown in Fig. 3 means GE 2 and the branch lines Az-Ll and Az-L2 in a corresponding Way assigned switching means replaced. The branch line Az-Lx connected to the connection points 132 to 138 in FIG. 2 is no longer shown in FIG. 3 for the sake of clarity.

In the case of inquiry identification by an extension, e.g. B. Nl, which has occupied the operational transfer B-UeI in Fig. 2, the contact 19yl is closed. The switching processes corresponding to circuits 1 to 5 take place. If the requested extension takes over the call with the subscriber in the private branch exchange N-A2 (see FIG. 1), the contact 3IwIm of the operational transfer B-Ue-I in FIG. The circuits 6 and 7 are established. The switching status thus arises after the transfer marking: Relay Bl (circuit 7) switched on and the contacts of relay A 1 in the rest position.

If the outgoing line GLl is the only line that is occupied for a connection between the private branch exchange N- A1 (see. Fig. 1) and the private branch exchange NA 2 (see. Fig. 1), only the relay Dl in Fig. 3 of the chain arrangement switched on.

The first assignment of a line, e.g. B. GLl, a charging circuit for the capacitor C 2 comes about by closing the contact 146g 1. The pulse relay Jl is switched on briefly. switched on in Fig. 2 via contact 88sp2 and held by contact 64g2.

By closing the contact 153g2, the capacitor C 5 is charged and the relay Jl is switched on in the charging circuit.

19. +, CS, 153g2, GrIO,

158 * 2

The winding I of the relay X is short-circuited by the contact 174y, and the winding II of the relay X is short-circuited by the contact 159 *, so that the contacts of the relay X are delayed in the rest position.

20. +, 161 * 1, 167 *. W & y, 169 <f5, 170 ^ 3, 171 ii,

D2 (I), -.

The following holding circuit is formed for the Y relay:

21. +, 32 «1, 3361, 159 * 1, Y (I), 171y, -.

The D2 relay is held in the following circuit:

22. +, -5_, 172 ^ 2, D2 (I), -.

After the capacitor C 5 has been discharged, the contacts of the relay Jl are returned to the rest position. The relay Y is switched off because the contacts 159 * 1 and 173 * are open. If another line, e.g. B. the incoming connection line KL2 occupied, the relay K2 is switched on. The capacitor C 4 is charged and the relay Jl is switched on in the charging circuit.

23. +, Ci, 151 £ 2, GrS, μ _.

158 * 2

The relay X is switched on again.

84 pounds 2

24. +,, 159 * 1, 16Oy, X (I), -.

83gl or 85g2

The relay D 3 of the chain arrangement is switched on.

25. +, 161 * 1, 162 *, 163y, 164 ^ 4, 176 ^ 2, D3 (I), -. Relay D3 is held in the following circuit:

84Ä2

26. +,

83g 1 or 85g2

17703, Z> 3 (I), -.

14. +, C2, 146gl, Gr4,

157 sp

158 * 2

-, Jl ₁ -.

The following circuit is created for the X relay:

15. +, 32a 1, 3361, 159 * 1, 160y, X (I), -.

The first relay Dl of the chain arrangement is switched on.

16. +, 161 * 1, 162 *, 163y, 164 ^ 4, 165 ^ 2, Dl (I), -. The Dl relay is held in the following circuit:

17. +, 32 «1, 3301, 166άΊ, Dl (I), -.

The / 1 relay (circuit 14) is activated after charging of the capacitor C2 switched off. The following circuit is created for the Y relay:

18. +, 32a 1, 3301, 173 *, Y (II), Z (II), 160 ^, X (I), -.

If another line of a branch line, e.g. B. the outgoing line GL 2, occupied for a connection between the private branch exchange N-A1 (see. Fig. 1) and the private branch exchange NA 2 , the relay G2 after the capacitor C4 has been charged

Contacts of relay Jl returned to the rest position.

The following circuit is established for relay Y:

27. +,

83

, 173 *, Y (II), X (U) ₁ IGOy,

83g 1 or 85g2
X (I), -.

The Y-Re) ais is held in the following circuit: 84 pounds 2

83g 1 or 85g2

' ^173χ

²⁸ ·

It is now assumed that one of the occupied lines of the branch lines, e.g. B. the last occupied line KL2 is enabled again. In this case the relay K2 is switched off. As a deletion indicator, the capacitor C 4 is discharged in the following circuit and the relay J2 is switched on:

29. C4 +, battery, / 2,

179 * 1

QrT, 150Ä2, C4

The contacts of the X relay are, since the two windings I and II through the contacts 174jy and

175 c2 are short-circuited, led to the rest position. The winding II of the last switched on relay D 3 of the chain arrangement is switched on in the following circuit:

30. +, IdOiZ, 18Ix, V & 2y, 183 ^ 4, 184 ^ 2, 185 ^ 4,

The winding I of the D 3 relay and the winding II of the D 3 relay are connected in opposite directions, so that the contacts of this relay D 3 are brought into the rest position. After the contacts of this D 3 relay have been brought into the rest position, the circuits 26 and 30 are interrupted. The contacts of the / 2 relay are returned to the rest position after the capacitor C 4 has been discharged. The holding circuit 28 of the relay Y is interrupted. Thus only the relays D 1 and Ώ2 of the chain arrangement are switched on. If again a new line of a branch line, z. B. the inquiry line RLl, occupied for a connection with the private branch exchange N-A2 (see. Fig. 1), the relay 51 is switched on in the circuit 7, while the relay A 1 is switched off by circuit 6. The capacitor Cl is charged and the relay Jl is switched on in the charging circuit.

31. +, C3, 149 «1, 148 & 1, Gr6,

158i'2

₁ Jl, _.

The X relay is switched on.

32. +, 32 «1, 3361g, 159 * 1, 16Oy, X (I),

30th

The D 3 relay is switched on again in circuit 25 and held in circuit 26. After the end of the pulse, relay Y is switched on.

33. +, 32αϊ, 33δ1,173 *, Y (II), Z (II), 160 ^, Z (I), -.

The Y relay is held in circuit 28. If two more lines are used for connections between the private branch exchange N-A1 (see. Fig. 1) under the private branch exchange N-A2 (see . The Z relay is switched off again in the event of a further pulse, ie a further occupancy of a line. The following circuit is established for relay D 4:

34. +, 161 ti, 167 *. I683 /, 169 ^ 5, 186ά "3, D 4 (I), -.

After this pulse has ended, the Y relay is switched off again. In the event of a further assignment, the Z relay is switched on by another pulse, and the following circuit is established for relay D 5 :

35. +, 161 * 1, 162x, 163y, 187 ^ 4, D 5 (I), -.

After the pulse has ended, relay Y is switched on in accordance with the switching processes already described (corresponding to circuit 33). If another line of a branch line is occupied, the / 1 relay is switched on again and relay X is switched off, so that the following circuit is established for relay Sp:

36. +, 161 * 1, 167x, 168y, 188 ^ 5, Sp, -.

A total of five lines are now occupied for connection traffic.

When the S ^> relay is switched on, the relays S ^ l and Sp2 in FIG. 3 are switched on in accordance with the circuits 11 and 12. The assignment of further lines is prevented by the contacts of these relays Sp 1 and Sp2 to Spχ in accordance with section 2. The following holding circuit exists for the Sji> relay:

37. +, 189s ^>, 190i5, Sp, -.

The S ^> relay is held until a busy line, z. B. GLl, becomes free again. Leading through the rest position of the contacts of relay Gl, capacitor C2 is discharged and relay / 2 is switched on.

179 * 1

38. C2 +, battery, / 2, -, size 3, 145gl, C2 -.

178 sp

The winding II of the relay £> 5 is shown in the following Circuit effective:

39. +, 180 * 2, 181 *, 182y, 191 ^ 4, 192d5, 05 (11), -.

Since the winding II of the relay D 5 is connected in the opposite direction to the winding I of the relay D 5, the contacts of the relay D 5 are brought into the rest position. If further lines are free, the relays D 4, D 3, D 2 and Dl are switched off one after the other, corresponding to relay D 5, when the corresponding counter-windings take effect. If another line is occupied in the meantime, a corresponding relay of the chain arrangement is switched on again by switching on relay J1. These switching processes take place in accordance with the switching processes already described.

The chain arrangement is designed so that as many relays of the chain arrangement are always switched on as lines for connection traffic between the private branch exchange NA 1 (see FIG. 1) and the private branch exchange N- 12 are occupied. In order to prevent that the activation of the chain relays is disturbed in a certain order when a line is occupied and another line becomes free, the S_ £ relay is switched on each time a line to the private branch exchange is occupied in the following circuit:

40. +, 193 * 1, Sp, -.

In this case, switching on the relay Sp prevents the simultaneous seizure of another line. Furthermore, the opening of the contact 179 * 1 and the open contact 178 sp prevents the relay / 2 from being switched on at the same time. It is achieved that only one recording can take place at the same time. When a line becomes free, the relay Sp is switched on in the following circuit:

41. +, 194 * 2, Sp, -.

This means that if at that point in time another line is seized and the relays Sp 1 to Spx are also switched on. No further line can be seized temporarily. The open contact 157 sp and the open contact 158 * 2 also prevent the relay Jl from being switched on at the same time. The activated devices of the branch lines are triggered in the manner already described.

The assignment of an inquiry line, e.g. RLl of the branch line Az-Ll, can be identified by the switching status: Relay Bl switched on, relay A1 in the rest position (after the transfer identification), also in the simplest way by a relay that only indicates the assignment status of the inquiry line to the device GE 1 or GE2 provided jointly for all branch lines.

Claims (8)

Patent claims: 1. Circuit arrangement for a telephone system with dialer operation and connection traffic between 009 679/110 Private branch exchange systems in which further connections via other lines are prevented when a certain number of certain lines are occupied, characterized in that both when a branch line (GLl in Fig. 2 or 3) is occupied for outgoing connections and when a branch line (KLl In Fig. 2 or 3) for incoming connections as well as when using a branch line (RL 1 in Fig. 2 or 3) for inquiry connections to the named branch lines assigned, the occupancy status characterizing switching means (RelaisGl, Kl, Al and Bl in Fig . 2 or 3) the identification of the number of all occupied branch lines (GLl, KLl, RLl in Fig. 2 or 3) in a device (GE1 in Fig. 2 or GE2 in Fig. 3) assigned jointly to the branch lines and with simultaneous activation of a certain number of the switching means characterizing the occupancy state of the branch lines mentioned (RelayGl, Kl, Al and Bl in Fig. 2 and 3) blocking switch medium (relay Ü, Sp in Fig. 2 or relay Sp in Fig. 3) to prevent an occupancy of another line become effective. 2. Circuit arrangement according to claim 1, characterized in that when the branch line (AL 1 in Fig. 2 or 3) for inquiry connections, the switching means (relays Al and Bl in Fig. 2 and 3) to identify the occupancy of this line (RL 1 in Fig. 2 or 3) only after a transfer marking (closing of the contact 31 «1 in Fig. 2) a marking in the device commonly assigned to the branch lines (GE1 in Fig. 2 or GE 2 in Fig. 3 ) cause. 3. Circuit arrangement according to claim 1, characterized in that each branch line (GLl in Fig. 2 or 3) for outgoing connections, each branch line (KL 1 in Fig. 2 or 3) for incoming connections and each branch line (i? Ll in Fig. 2 or 3) for consultation calls in the branch lines GLl, KLL, RLL in Fig. 2) assigned jointly means (gel in Fig. 2), a resistor (eg .KLl the resistance Wi 1 in Fig. 2) in a bridge branch of a bridge arrangement is switched on to identify the occupancy status. 4. Circuit arrangement according to claim 3, characterized in that when a certain number of resistors are switched on in the bridge branch of the bridge arrangement, a relay (Ü in Fig. 2) in the zero branch of the bridge arrangement becomes effective, which blocks all branch lines for outgoing and incoming connections causes. 5. Circuit arrangement according to claim 1, characterized in that by the identification of the occupancy state of a branch line (e.g. GL1 in Fig. 3) in the device (GE2 in Fig. 3) which is commonly assigned to all branch lines, switching means (relay Jl, X, Y in Fig. 3), which turn on a relay (z. B. Ό2 in Fig. 3) of a counting chain and in the counting chain as many relays (Dl to D 5, Sp in Fig. 3) are switched as at the same time Branch lines for outgoing, incoming and inquiry connections are permitted. 6. Circuit arrangement according to claim 5, characterized in that the last relay provided in the counting chain (Sp in Fig. 3) is a blocking relay which causes the blocking of all branch lines for outgoing and incoming connections. 7. Circuit arrangement according to claim 6, characterized in that after an occupied branch line becomes free (e.g. GLl in Fig. 3) for the connection traffic, a deletion indicator is transmitted to the device (GE2 in Fig. 2) assigned to all branch lines . 8. Circuit arrangement according to claim 7, characterized in that switching means (relays Jl, X, Y in Fig. 3) which switch off the last switched on relay (z. B. D5 in Fig. 3) of the counting chain are activated by the deletion indicator. In addition 3 sheets of drawings ® 009 679/110 12.