DE235301C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 235301 CLASS 21 a. GROUP

the remote connection takes place.

Addendum to additional patents 193894 from April 27, 1906.

Patented in the German Empire on July 7 , 1910. Longest duration: February 14, 1921.

It is well known that long-distance calls are made between localities in such a way that a special official of the local traffic office (the so-called remote office) sends a message to the local office sends, as soon as the trunk line becomes free, to that from outside or from a participant the local office itself to convey the desired long-distance call. This notification has already been made some time before the trunk line becomes free in order to inform the relevant subscriber of the If he is making a local call, to give the local office time to finish it, or the upstream officer who switches the subscriber to the remote exchange should give time to do this before the long-distance line is switched on in the long-distance office.

In the patent 193894- is a circuit for this purpose described in which case the pre-emptive officer after the dated Remote exchange received instruction instead of switching the subscriber to the remote exchange immediately, first establish a provisional connection via the ballast plug, via which the subscriber - can continue his local call until this provisional connection is also interrupted either by the reporting officer or electromagnetically from the remote office. The production this provisional connection is done by means of a special latch, which except the isolating contacts to switch off the subscriber from his multiple jacks Has auxiliary contacts for the provisional speech channel. The ballast has accordingly a plurality of mutually insulated contact parts.

The subject of the present invention is a device such that the usual advance pawl, which only has isolating contacts and a simple plug can be used.

For this purpose, the voice line leading from the plug to the remote exchange is used connected to an auxiliary plug via a switch in such a way that by plugging it in this auxiliary plug into a multiple jack of the subscriber establishes a new voice connection between the participants via the said switch is established, which then, if the long-distance line becomes free, is interrupted by flipping the switch. The desk is either by the pre-emptive officer following the instructions of the remote office or by the civil servant of the remote office itself. In the latter case, he can still be at the front desk be arranged and is then moved electromagnetically.

An embodiment of the invention is illustrated schematically in the drawing.

From a not shown participants parts a line A leads, b in the known manner on the isolating contacts i, 2 of the Vorschalteklinke kf to the multiple jack kv and further any to a non-drawn line relay type. The Vorschaltetisch is denoted by V and against the adjacent multiple switching space O ₁ by the dotted line xy how this square against the

ίο other multiple switch places O ₂ , O _{3 of} the local authority, delimited. The line 3 connects all the jack sockets and is connected to the positive pole of the Amfsbatterie via a resistor 4. The reference plug is denoted by vs , the auxiliary plug arranged according to the invention with hs and the switch that can be turned over by the magnet e from the remote office is denoted by u.

In the rest position of the switch u it connects the two-sided plug lines 5, 6 and 7, 8 with each other, while the line 5, 6 is also permanently connected to the line 9, 10 leading to the remote office F.
The operation is as follows:

As soon as the remote officer * notifies the connection point V in a known manner, which is not of interest here, that a subscriber of the local office is desired for a long-distance connection, the connection officer at V checks the line a, b of the subscriber concerned to see whether the subscriber is already making a local call (wherein the socket of the Vorschalteklinke kf in the known manner a test potential has), and puts then either the plug vs in the pawl kf or - when a local call is present - also the plug hs in a multiple jack of the square O ₁ a. If this place is served by a special officer, he gives this officer the instruction to put in the plug by means of a service line or a signal in some known way. The places or plugs can be connected by control signals in order to indicate that the connection vs-hs has been made correctly to both places. The place O ₁ can either be a regular multiple switch place of the local office or exclusively for the operation of the plug hs .

. By inserting the plug vs into the jack kf , the contacts 1, 2 of this jack are opened and the subscriber line a, b is separated from the multiple jacks, but this separation point is created by the connection 5, 6 - 7, 8 between the plugs vs, hs bridged, so that a local voice connection of the subscriber, which has already been established on the seats O ₂ or O ₃ etc. via a multiple jack, is initially still maintained.

As soon as the long-distance line becomes free, the long-distance office sends a current over the line 11 and the magnet e, which now flips the switch u. This disconnects the connection 5, 6-7, 8 and switches the subscriber line a, b to the telephone line 9, 10. The local voice connection is only now interrupted, since the line 7 , 8 no longer has a connection with a, b and the jack contacts 1, 2 are open.

The circuit can be modified in detail. For example, by means of a relay, which is excited via a third contact of the plug vs or hs , the switch u, which then keeps the connection 5,6-9,10 closed in the rest position, can only be switched to the connection position 5,6 - 7, 8 are brought. The relay is then influenced by the remote office by counter-switching a voltage or short circuit, etc. in such a way that it drops the armature again. This saves electricity during the call.

Instead of the magnet for moving the switch u , movement by hand can of course also be provided, as already mentioned, whereby the switch can be arranged either on the remote exchange or - to save wiring costs - on the upstream location V or auxiliary location O ₁ . In this case, the remote officer will instruct place V or O _{1 to} flip the switch.

Claims (1)

Patent claim: Circuit arrangement for the operation of long-distance lines according to patent 193894, in which the disconnection of the local call, instead of when the connecting pawl is plugged, only takes place when the remote connection is established, characterized in that for the purpose of using ordinary connecting pawls (kf) with isolating contacts the connection from the connecting plug (vs) to the remote Office (F) leading intercom line (5.6 to 9.10) is connected via a switch (u) with an auxiliary plug (hs), such that by insertion of this auxiliary plug in a multiple jack (kv) of the subscriber line a new call connection (5 , 6-7,8) is established between the participants via the switch mentioned until this connection is also interrupted by flipping the switch. 1 sheet of drawings.