DE1060920B - Circuit arrangement for community lines without extension - Google Patents

Description

GERMAN

To save ladders in connection with a group of participants with low traffic, the z. B. by Participants living in a common building are often called community connections used. These must have individual call connections in both the incoming and the also ensure outgoing traffic and usually also individual call counting. The technical Execution consists in principle of a joint transfer arranged in the office, the one for all Subscribers shared two-wire communal trunk line and a communal switch, from which the individual community branches to the individual participants.

Shared connections can basically be implemented in two ways, either with direct dialing or with tapping operation. The invention relates to a circuit arrangement for common lines of the second-mentioned type. Use previously known devices with tap operation In the community transmission a pickup dialer, which - the speech arteries of the individual Line selector outputs for a party connection to the community trunk switches through.

A known embodiment used to search for the relevant output individually to the tap selector contact bank connected c-cores. Another known version uses one of the Voice wires, while the c-wire is common for all line selector outputs of a community line is and only serves to start. In all known circuits, the speech wires of the individual Line selector outputs for a party line individually from the arms of the alligator connected to the community main line.

As the community main line through a conversation of one participant is occupied for the whole group, it was previously impossible to switch the officer on to every other participant in the group, because the line selector output of the further participant on contacts of the tap selector bank ends on which the tap selector switch arm is not set.

In the known facilities, the establishment of a community connection requires certain changes in the circuit of the exchange facilities, and there are only the community connection once and for all the relevant numbers are available, so that when a community subscriber is relocated his phone number can no longer be retained. These shortcomings are addressed in the Circuit arrangement according to the invention thereby circuit arrangement

for community connections

without extension

Applicant:
TESLA, närodni podnik, Prague-Hloubetin

Representative: Dipl.-Ing. A. Spreer, patent attorney,
Göttingen, Groner Str. 37

Nikolaj Poljak, Prague,
has been named as the inventor

fixed that the voice cores of the same name in the joint transmission are constantly galvanically connected to each other are connected, while the test leads individually in a known manner to the contact bank of the Pick-up selector are performed. In this case, a contact interrupts a starting relay common to the participants in the case of an incoming connection establishment, the control circuit for the outgoing connection establishment.

This circuit arrangement ensures the following: If the shared main line is occupied by a call, the officer can still easily call another participant

"of the same party line a conversation through convey that they lead the existing conversation participants after mere intrusion to the Asks to hang up. This happens regardless of whether the existing on the community main line Call was conducted by the desired subscriber or by another subscriber on the same party line.

Another advantage of the circuit arrangement according to the invention is that the office without any changes or modifications to such a common transmission shaft can be extended, as these ^in: is the same simple manner as an ordinary subscriber line connected to the main manifold. This also results in the fact that the community subscribers can be assigned any number, even not belonging to the same group of hundreds, and that any change in the number can be carried out easily. Accordingly, a high level of adaptability is achieved. The construction of the actual tap selector is also

909 560/105

easier, since only a small number of switching arms is required.

The principle of the invention is to be described in more detail using an exemplary embodiment shown in the drawing to be discribed.

The group is connected to the telephone exchange through the outputs of the shared transmission G Ue shown in the left half of the drawing. The connection is made with three wires for each subscriber set (wires aIj bl, el; a2, b2, c2; etc. up to an, bn, cn). All speech cores of the same name α and b are galvanically connected to one another. The wires c 1 to cn are individually connected to the individual lamellae of the contact bank of the tap selector ve . In addition, the test leads are connected to the starting and blocking group and control a common starting relay C. When an incoming connection is set up, ie when the line selector in front of it is turned to the position corresponding to the desired participant, the corresponding test lead c 1 to cn earth in known Wise laid out. The starting relay C responds via the starting and locking group. The contact c 1 closes the excitation circuit for the rotary magnet V of the tap selector ve:

1. Voltage, rotary magnet V of alligator selector ve, interrupter U ₁ contact / * 4 of relay P ₁ contact c 1 of relay C ₁ earth.

The rotary magnet V is alternately excited by the interrupter U and de-energized again and controls the tap selector ve step by step until it has found the c-core marked by the earth potential. In the same rhythm is closed by the selector contact va the circuit for the electoral relay VR in the common switch GTo.

2. Voltage, contact va of selector V _1, contact p 2 of relay P ₁ & -Ader, selector relay VR ₁ earth.

The selector relay VR is set to match the tap selector ve . Contact c2 opens, but this has no effect on the selection of the desired participant. As soon as the tap selector ve runs onto the occupied test wire c 1 to cn , the relay P responds via its winding 1-2.

3. Voltage, winding 1-2 of relay P ₁ contact si of relay S ₁ pick-off selector ve, earth on the c-wire.

The relay P responds and, through its contact / »4, interrupts the circuit 1 for the rotary magnet V of the pickup selector ve. At the same time, the speech path to the called subscriber is switched through by the contacts p 1 and p 2 of the relay P. The starting and blocking group marks all wires c 1 to cn as busy for a further connection establishment.

If, under these circumstances, a long-distance call arrives at one of the community participants, the officer can immediately join in via the telephone exchange, since all voice lines a 1 to an and b 1 to bn emerging from the office are connected together.

After the conversation has ended, the office interrupts circuit 3 for relay P; the relay P - drops out, and the contact /; 4 prepares the circuit 1 for the rotary magnet V again, so that after the renewed response of the starter relay C by a waiting in connection occupancy of a test lead el to cn the search for the desired participant takes place in the manner already described.

When an outgoing connection is established

the starting of the starting and locking group by the response of the relay S, which responds via the high-resistance loop of the circuit partially shown in the drawing. Relay P receives fault current.

4. Voltage, selector contact va of the pick-up selector magnet V _1, contact p 2 of the relay P ₁ ö wire, high-resistance loop (not shown) across the lifted apparatus, α wire, contact /> 1 of the relay P ₁ contact c2 of the relay C ₁ winding of the Relay S ₁ winding 3-4 of relay P ₁ earth.

The circuit for the rotary magnet V of the pickup selector ve is closed by the contact 6 "2 of the relay 6 ^1.

5. Voltage, rotary solenoid V of tap selector ve, interrupter U ₁ contact / »4 of relay P ₁ contact s 2 of relay S ₁ earth.

The pick-off selector ve is controlled step by step. At the same voter contact va controls in the manner already described the 'voters relay VR in the common switch GTo. The relay 6 "does not drop out during the rhythmic interruption of the circuit 4. In the position of the voter arms vra and vrb of the selector relay VR corresponding to the calling subscriber, the low-resistance loop is switched through in the common switch GUm via the calling device, and the relay P speaks through his Winding 3-4 to (4). The circuit for the step-by-step movement of the tap selector ve is interrupted again by the contact / »4. The calling subscriber is connected to the exchange via the contacts pl and p2 .

The relays S and P continue to hold themselves after responding:

6. Voltage, contact r of relay R, contact / »3 of relay P _1, contact j 3 of relay S ₁ winding of relay S ₁ winding 3-4 of relay P ₁ earth.

The connection is triggered by the fact that the office applies voltage to the corresponding wire c 1 to cn , through which the relay R responds:

7. Earth, winding of relay R ₁ contact si of relay S ₁ tap selector ve, respective c-core, voltage in the office.

The relay R interrupts the holding circuit 6 for the relays 5 ″ and P through its contact r . These drop out. The circuit 7 for the relay R is interrupted by the contact j 1 of the relay 5 ^1. The starting and blocking group is located in Idle state and is prepared for the transfer of further calls.

If an incoming assignment of a test wire c 1 to cn occurs during an outgoing connection setup, which, as explained above, is characterized by the response of the relay C , the contact c2 interrupts the circuit 4 in which the calling subscriber is searched for. If an incoming and an outgoing call arrives in the joint transmission GUe at the same time, the incoming call is therefore always set up, since the pickup selector ve cannot remain in the position corresponding to the calling subscriber. After the relay P has responded, it remains in the position of the called subscriber through its winding 1-2 in circuit 3.

Claims (2)

Patent claims: 1. Circuit arrangement for shared connections without direct dialing, in which a selector arranged in the shared switch can be controlled by a tap selector arranged in the shared transmission, characterized in that the speech cores of the same name (al to an and bl to bn) in the shared transmission (GUe) are constantly galvanically connected to each other are connected, while the test leads (c 1 to cn) are individually led in a manner known per se to the contact bank of the tap selector (ve) . 2. Circuit arrangement according to claim 1, characterized in that a contact (c2) of a starting relay (C) common to the subscribers interrupts the control circuit (4) for the outgoing connection setup when an incoming connection is established. Considered publications:
German Patent No. 903 596;
E. Hettwig: "Telephone dialing systems"
Pp. 267 to 271. 1942, 1 sheet of drawings © 909 560/106 6.59