DE1005571B - Circuit arrangement for telephone extension systems - Google Patents

Description

GERMAN

The invention relates to a circuit arrangement for telephone branch exchange systems with a first answering station (usually extension 1) for the incoming exchange call and exchange call forwarding to a second Answering station (usually extension 2) if the outside call is within a certain time of the first Attendant station has not been queried.

In the systems known up to now, the incoming exchange call is switched and the switchover takes place the exchange call to any extension by means of special manually operated switches, which are either in the system itself or another location. In the latter case there are additional, manually operated Switches such as rotary switches, toggle switches or locked buttons with special switching cables are required.

The invention avoids such manually operated switches or buttons and achieves this in that of any call station by dialing code numbers using the existing number switch or numeric encoder be influenced in a selection device switching means, which the selection device in the rest position and remain in effect until the dialing device is set again by this intercom sent out election current surges switching means are actuated, which is a marking of the now as an interrogation point cause certain call station and possibly the aforementioned switching means ineffective make and bring the selector to the rest position again to do this again by the same Intercom station issued further dialing current impulses to mark the intercom station designated as a further call station to adjust.

With this arrangement, it is of particular importance that an extension unit authorized to switch over (e.g. the night station) can switch on the incoming public call while this has so far been the case Operation of the night switch in the system had to take place. If the switchover was forgotten, it was for an external extension associated with considerable difficulties.

To switch the exchange call, it is sufficient to dial a preparation code, whereby any number is suitable that does not trigger an outgoing call to a call station and the suffix dialing of the extension number should be the first answering station. Switching the exchange call to the second answering station is done by subsequently dialing the number of the second answering station. If the original operating status for the incoming exchange call is to be restored, the preparation code must be dialed. If the original operating status for the external call is also to be restored, the subsequent dialing of number 1 is required. The invention is based on the drawing in more detail circuit arrangement
for telephone exchange systems

Applicant:

ELMEG, Elektro-Mechanik GmbH,
Peine (Hann.)

Siegfried Wegner, Peine (Hann.),
has been named as the inventor

explained. As an exemplary embodiment, it is assumed that a private branch exchange with a Trunk line, five extensions and a first answering station with call forwarding used, whereby as Detection relays are used and the number 7 is used as the preparation code became. The circuit excerpt concerns only those parts of the system that are necessary to understand the invention are.

I. Choice of preparation code 7

If the first answering station (usually the main station) wants the exchange call to extension 6 and the exchange call, who presumably arrives at extension 6, switch to the main unit, so the main unit dials First the preparation code number 7. This triggers the following switching functions:

a) Response of relay VII, which prepares the setting of latching relay H6.

b) The dropping winding II of the respectively addressed latching relay H (in this case latching relay HV) is traversed by counter-fault current, and the latching relay drops out.

c) Activation of the relay chain, which is also used for the subsequent setting of the latching relay H6 .

This is done in detail as follows: By removing the handset from the main office, the internal connection set is assigned in the usual way, and the relays T1 , J, Fl and AnI respond depending on one another. When the preparation code 7 is subsequently selected, the relay / operates in a pulse-like manner and controls the relays I to VI of the relay chain in a known manner with the relay K (in interplay with the relay L). During the selection, the relay V2 and, depending on it, the relay V5, not shown, is maintained. With the sixth pulse (relay K has dropped out, but relay VI picked up) the preparation relay VII comes via contact 1 1IV of subscriber relay T 1

609 867/142

3 4

to respond, while relay VI continues to result in relay E via its own circuit '....... contact el and the follow-up idle contact 811

ki ,, 21Ii 211] um, niv, vii (i) _g _ s.ev, »211,711 _{gn Ruh}> 8II}

CiA

Vl (Il), Olli 5

kll, an2, el, anil, ι; II, +. . (in working position), «« 2, el, anll, »II, +.

As is well known, the seventh impulse speaks of the Re- This enables the second activation of the relay

lais K on again. This disconnects circuit 1, chain and thus the dropout of relay VI. The current-

and the relay VI drops out, while the drop-out circuit 7 for the latching relay H6 is disconnected

hesitated preparation relay VII further in the following. The latching relay H6 remains de-energized. The

Circuit holds pulled marker switchgear Stick-on relay H6 so-

2 '_ VIIfII) 6IV 71 8III anll all -1- with the indicator for the switching state.

After the series of pulses, the relay V2 , ₅ first drops out. ^{The first} interrogation point is extension 6 and later the delayed relay VS drops out. Since in the case by the response of electronic documents the connection of the inner set of said capacitors are each addressed latching relays W (in this case Hafttor C24 in the circuit relay Wb) of a directed against fault current throughput was simultaneously

• 3. -, ClA, 711, an2, el, anll, »II, +, ^{flowed and faded}

*, α u «. ι -uu -ua U ₁ , "10- -» W6 {11), w611, 8IV, eil, +.

had charged, he can now discharge himself via the drop-out delayed relay E and this briefly in

4. Minus side of the capacitor ClA, E, 6 V,, 211, 711, ^{more the} switchover of the exchange call. Plus side of the condenser. ^a5 ni. Second by-election (of the number 1)

The pick-up delay of the preparation relay VIII Soll, as assumed above, the external call from

prevents it from responding until the Kon extension 2 is switched over to the main unit, taktes el in the circuit so is the suffix dialing of the extension number 1

c -vt-tt / tn ν-χΛτ , «τ" οτ ", ν, ο" τ """it" .-! τ ι 3 ° required. As known, after the election in the

5. -, VlIi (I), 71V,, 51, »21, anl, ei, anll, » 11, +. ° _. . . , _Λ '. . _r '■ ,, · ,. ,, ■., ■.

Relay chain the relay I remains attracted, arises after

This circuit is opened by opening the contact - the release of relay V2 following response current-

tes »5I of the now falling relay V5 finally circuit for the latching relay PFl

separated. By briefly opening the contact el ^ Wib II Wl (I) 81, 2IV +

the dialing chain is activated and restarted, 35 "'' ''

so that it can be used in conjunction with the preparation relay VII.

to respond to the marker switching means, the stick-on relay Wl is the indicator for the switching state,

relay H6 can also be used. _ ... ,,. _XT ,, ,,.

At the same time, the discharge winding of the jeweüs Toggle ^Zwelte is answering station is Extension 1 spoken latching relays H (40 Da relay E no longer effective in this FAILE Haftre- in circuit 9 werlais Hl) through, from an oppositely directed fault current the can, no additional activation takes place of Dial fins so that this chain falls off. The hanging up of the handset at the main

nt m \ Z.1TT rtv /.tt _i_ stelle ends the setting. Through the contacts 7V

, ti (li), Aiii, öiv, eil, +. _{and 8F in the ringing circuit}

⁴⁵ F (I)

II. Post-election of number 6 12. ~, - ^ -, »5Π, pll, 7V, 8V etc.

If, as assumed above, the incoming exchange call is suppressed from the transmission of ringing current, so that

are switched to extension 6, then the switchover does not disturb the subscriber in any way. Headquarters, follow the number 6. As known, at 50

End of election in the relay chain the relay VI addressed iy. An incoming exchange call occurs after the relay V2 drops out via the

Contact 7III of the preparation relay VII below An incoming public call should be prepared accordingly

Response circuit for the latching relay H6 assumed changeover initially at extension 6

7 Γ6 (ΙΙ) 61 Η6 (ΐ) 7III, 2IV -I- ^{55 and>} ^ ^s ^ ^{er nac} - ' ¹ not queried for a certain time

'''' will be received by the main office.

The relay Γ6 cannot arrive in this circuit

speak as it is getting faulty power. When the trunk line is addressed, relay A in the call cycle to respond,

of the relay VI in the relay chain was circuit 2 with the contact al, the relay H is energized, which

separated for the relay VII, but this remains 60 on contact MI and its winding II continues

as a result of its drop-out delay until the Re- is in the circuit

lais V5 drops. This creates after the decline of the WiQ H (II)

Relay V2 following response circuit for the 13th -, - = ^ - ^ -—, MI, gill, +.

Relay VIII ^{Th wl}

8. -, VIII (I), 7IV,, 51 ,, 21, an2, el, anll, »II, +. ⁶ S _Λ Via the contacts «Dog M ^ the ringing current is in the cycle

of the exchange call to extension 6 is routed to the current relay VIII via contact 8III and winding circuit
ment II continues, which at the same time creates circuit 2 for the

Relay VII is finally disconnected. The response 14. ~, eil, Dh, hl, h6Y, t311, uQlll, X6 (II), next to relay VIII has another brief response 70 place ext 6, X6 (l), w6I, £ 61, WiI, -.

In this circuit, relay Dh only becomes effective after the handset at extension 6 has been picked up and causes relay X6 to respond, the differential circuit of which is canceled by contacts dh and Ä6I. This in turn causes the relay (76), not shown, to respond, whereby the circuit for the relay S is initially closed.

15. _ S [T), «611, X6 (I), branch Nsv 6, X6 (II),

«6III, S (II), +. ίο

The relays Dh and X drop out, and when the relays V3 and G (not shown) respond, the extension is connected to the exchange line.

If, on the other hand, extension 6 does not lift off, after a certain time the thermal relay Th in the circuit 13, which switches on the relay W with its contact th, heats up. The contact z £> III now forwards the call via the relay Dn and the preparatory contacts IV, Al IV etc., similar to the circuit 15 described above, to the main station.

V. Switching back the exchange call

The exchange call is switched back to the main unit from the extension switched as the main unit by dialing the preparation code 7. This causes the latching relay H6 to drop out (cf. circuit 6). If the exchange call should also be switched back to extension 2, this is done by post-dialing the number 1. This also throws off the latching relay Wl . Only after hanging up the handset does the test circuit for the latching relays Hl and W2 become effective. This can be dependent on the non-illustrated break contacts of the subscriber relays (e.g. Tl) if the relevant extension is authorized to switch, or a series connection of break contacts of the preparation relays VII and VIII.

16. -, JiI (I), Ä2III, Ä3III - Ä6III, ti, + or
-, W2 (l), ozlIII, ozSIII-zezöIII, +.

45

The next exchange call will then be sent to extensions 1 or 2, which are normally intended for this purpose directed.

The switchover authorization can be assigned to each extension if a working contact of the corresponding Subscriber relay is switched in parallel to contact illV. Switching the incoming Office call is z. B. from extension 2 by dialing the code number 7 and then choosing your own Extension number 2 possible. The circuit and description can be seen without further ado that by corresponding expansion or redesign of the relay chain, including any other digit as a preparation code can be determined that does not result in a call to an extension, e.g. B. the number 0.

Claims (6)

Patent claims: 1. Circuit arrangement for telephone extension systems with optional determination of any intercom station as an interrogation point for the handling of incoming public traffic and with call forwarding if an incoming public call is not handled after a certain time, characterized in that from any intercom station (ζ. B. main station) by dialing code ( e.g. number 7) can be influenced by means of an existing number switch or number transmitter in a selection device (relay selector) switching means (e.g. relay VII), which bring the selection device into the rest position and remain in effect until the selection device is set again Dialing current impulses sent by this intercom station switching means (e.g. detention relay H2, relay VIII) are actuated, which mark the intercom station (ζ bring the device to the rest position again in order to mark it again by further dialing current impulses emitted by the same intercom station (e. B. detention relay W6) to set the call station designated as a further call station. 2. Circuit arrangement according to claim 1, characterized in that the restoration of the normal operating state (z. B. first answering station = extension 1 and second answering station = extension 2) by dialing the code number (z. B. digit 7) and suffix dialing the number of the Extension 1 takes place, whereby the marking means (stick-on relay Ή.2 and stick-on relay W6) are reversed when the preparation relays (e.g. relay VII and relay VIII) in the dialing device respond. 3. Circuit arrangement according to claim 1 and 2, characterized in that the switching of the incoming exchange call to any first answering station and the switchover of the exchange call to any second attendant from any fully authorized extension by the response of the preparation relay (e.g. relay VII) when dialing the code number (e.g. number 7) Contacts of a relay assigned to the subscriber in the private branch exchange is initiated (e.g. Contact * Uli). 4. Circuit arrangement according to claim 1 to 3, characterized in that if the power supply fails Maintain the switching status established by the preparation of the code numbers and the selection of the allocation remain. 5. Circuit arrangement according to claim 1 to 4, characterized in that the continuation of the Switching state is guaranteed by means of a relay, which is prevented from falling through suitable measures will. 6. Circuit arrangement according to claim 1 to 5, characterized in that the relay is latching relay be used. 1 sheet of drawings © 609 867/142 3.57