DE825708C - Circuit arrangement for the remote identification of connections and activation in telephone systems with self-dialing long-distance traffic - Google Patents

Description

Circuit arrangement for remote identification of connections and connection in telephone systems with self-dialing long-distance traffic When switching telephone connections In long-distance traffic, activation and separation used to be a valuable aid for traffic processing in the remote office. As long as local and long-distance traffic is operational were completely separated, the transfer went perfectly. Local connections only were affected by the ringing and disconnection.

The picture changed when self-dialing long-distance traffic was introduced and the sharp line between local and long-distance traffic blurred. 1) a dated Subscriber built-up self-dialing remote connection in terms of circuitry the features had a local connection, it was not from the remote exchange from a local connection to distinguish. Call switching to a possibly important self-dialing long-distance connection and their separation in favor of an often insignificant hand-switched long-distance connection led to great inconveniences. It was therefore decided to use the call circuit and to forego separation as a matter of principle.

However, experience has shown that this waiver can be applied to the Handling of preferential calls in the event of line bottlenecks and overloads is disadvantageous affects. The reintroduction of the so-called remote office announcement is therefore urgent required. A prerequisite is a solution that eliminates the previous deficiencies.

The perfect solution requires that the trunk announcement be on busy Connections remain limited to hand-switched and dial-up long distance connections are protected against ringing and that in the case of hunt groups automatically when occupied occupied, d. H. lines accessible to the remote exchange announcement are controlled. Only under these Prerequisites are the remote office announcement without special consideration and without disturbance high-quality compounds can be used in a simple manner. Jette would be another solution mean the old mistakes and deficiencies that led to the cancellation of the remote office announcement have led to repeating to a greater extent.

The contradicting one thus results for the circuit design Demand, on the one hand, to allow a connection to local connections in principle, on the other hand, however, the self-dialing long-distance connections, the features in terms of circuitry a local connection have to be excluded from the intrusion. Because the participant establishes both local connections and self-dialing long-distance connections, can express this condition to the effect that those striving into the local network Subscriber connections as local connections, the subscriber connections striving into the long-distance network are to be treated as remote connections.

To treat local and long-distance connections differently To enable them, they must be marked differently in the speech state. This one The objectives are remote identification. It allows a special document identification the long-distance connection in such a way that the connection used in long-distance traffic is different is marked as the one in local traffic, occupied. In terms of circuitry, this will be carried out so that the Prüfast of the subscriber line with local occupancy over 60 ohms, is directly earthed in the case of remote occupancy.

The special task now is not just the remote office at the front the established connection as remote busy @, but also that of the participant Established self-dialing long-distance connection, in incoming and outgoing direction. As long as the remote connection is established exclusively by the remote exchange using the callback procedure remote marking in the outgoing direction was not necessary at all, because the connection device occupied by the remote exchange could not be called. In the self-dialing remote service this is different. There are two assignable subscriber lines on a self-dialing long-distance connection involved, both of which are protected against intrusion by remote identification have to. Remote marking in the outgoing direction is also accelerated Long-distance traffic necessary if the calling subscriber at the remote place in the immediate process is further connected. In this case, it is not sufficient to use the one chosen by the remote office to mark the remote number as remote-seized while the calling subscriber only appears locally occupied.

The invention relates to a circuit arrangement for remote identification of connections in incoming and outgoing direction in self-dialing long-distance traffic. Another feature of the invention is the optional approval of either only dt s Fernamts or; les Fernamts and the subscriber on existing connections.

i. Remote identification of a connection in the outgoing direction The subscriber sets up a dial-up long-distance connection in the same way as a local connection. In terms of the circuit, both connections run via the same selector elements (I. VW or AS, 1I. VW, I. GW). Nevertheless, it is possible to distinguish the local and long-distance connection in a simple manner by utilizing the temporal use of the count. The prerequisite for this is that the local connection is counted after the end of the call, whereas the self-dialing long-distance connection is counted at the start of the call.

Among other methods, the time pulse counting fulfills during the Conversation the condition. The first counting pulse is when the called party reports effective, while the further counting impulses continuously in uniform, through the zone are transmitted at defined time intervals. With the start of counting, i.e. H. with the first counting pulse, the remote identification of the subscriber line is effected.

For this purpose, a: second low-resistance winding of the R relay is placed in the c-branch of the I. VW (Fig. I). It is under fault current during the test and assignment process (approx. 140 mA). A large stroke ensures adequate protection against fault currents. The approximately seven-fold current gain during the transmission of the first counting current impulse (around 10,000 mA) at the beginning of a self-dialing long-distance call causes R to pull in. R immediately puts earth on the c-branch in the direction of the line selector and thus identifies the subscriber line as being remotely occupied. Once pulled in, R stays above the normal energization current of the c-branch.

Since the main task of the R relay is to pick up the receiver, it must be avoided that it binds itself via the secondary winding in the counting circuit. The secondary winding is switched on in opposite directions for this purpose. With every switchover from one winding to the other the number of ampere turns goes through zero, so that the anchor is pressed with certainty. The remote identification of the connection during the short period of the local count is irrelevant.

With the call search circuit (Fig. 2), the call circuit of the Participant unaffected. An auxiliary relay F is required in the call searcher, which is in the The circuit of the counting wire is looped in or connected with high resistance to earth. Of the . The first counting pulse at the start of the self-dialing long-distance call activates the help relay, which puts directly earth on the test contact segment of the call circuit and so the Identifies the subscriber connection in the line selector as remote busy. The auxiliary relay binds locally via a secondary winding.

In accelerated long-distance traffic, the one controlled by the long-distance office sends Counting device the first counting pulse when the start character arrives the end. If the fee is not recorded automatically, the remote officer gives with or before the A start character is switched through to the line, which, as above, is a counting pulse and thus initiates remote identification.

In all cases, the connection is only characterized as a remote connection, if it has led to success., d. H. if the chargeable call is his Begins.

2. Remote identification of a connection in the incoming direction Um in the incoming direction to prevent intrusion to a line speaking in long-distance traffic with every long-distance connection, regardless of whether it is the subscriber in self-dialing long-distance traffic or the remote exchange has set up a remote number automatically in the incoming exchange generated. This is done by the fact that the local network is activated from outside the switching element characterizing this traffic situation, d. i. the incoming transmission, locally issues a remote identifier that shows the remote occupancy of the called person in the line selector Connection causes.

A remote connection is characterized by the activation of the local network via an incoming remote transmission. Only connections through this entrance gate open into the local direct current network are called long-distance connections with long-distance identification rated. A local connection that originates in the local direct current network can, however do not submit a remote number, unless it comes from the remote office.

A particular advantage of the solution is to leave it from the remote office out4.

makes dispensable via the pipeline. This eliminates all difficulties insert a special switching indicator before or immediately after dialing the number. The free choice time is not restricted, special counting and timing devices in the transfers are superfluous.

As in outgoing traffic, the remote identifier is also in incoming traffic Direction a purely local switching indicator, enough variants to create it are available in the local direct current network.

3. Activation of the remote office Through the remote identification, the Remote exchange announcement restricted to busy lines. Remote connections in hand-switched Traffic and self-dialing long-distance traffic remain unaffected. An essential condition a complete remote exchange announcement is thus fulfilled.

The second, no less difficult task remains the question of accessibility to solve. The remote exchange announcement may only be used by the remote exchange that is yours should serve both for connections in the local network and for long-distance dial-up connections. A connection by the calling subscriber must, however, in both cases be prevented. The remote exchange announcement is made by a single or double Post-pulse initiated, which in the case of a local presence, the line selector in the connection position promoted if he was prepared to do so by the remote license plate. In local traffic only the remote office is able to issue a remote registration number. Misuse is therefore excluded.

In long-distance dialing traffic, the local long-distance number is created automatically in the incoming transmission, so that it is no longer possible to distinguish one from the Subscriber or remote connection established by the remote exchange can be used. The introductory signal is now used to prevent activation in self-dialing long-distance traffic the remote office announcement, the postpulse, suppressed. For this purpose, the end-of-election sign is used exploited, which is mandatory in newer systems for a variety of processes will. The character that the line dialer returns after dialing the number, blocks further impulses in the counting transmission of the self-dialing remote connection or causes the occupancy release.

Fig. 3 shows the processes in a schematic representation.

.I. Activation of the subscriber in self-dialing long-distance traffic The procedure can be expanded even further by also the-. Participants in self-dialing long-distance traffic a connection to local calls is permitted. Injury concerns telephony secrecy and a persistent disruption in the event of improper activation should not exist if the objection is not made by the calling participant himself, but made by an announcement device in the line selector and limited in time will.

Technically, it prepares the approval of the activation in self-dialing long-distance traffic no difficulties and practically no costs according to the method described, since the facilities already available in the final stage only require a minor switchover need. On the contrary, considerable costs are saved by the fact that the remote places for handling the urgent traffic and the personnel expenses required for this .delete. If there are permanent or temporary inconveniences, the Activation in self-dialing long-distance traffic with the simplest means at any time be prevented.

The subscriber is able to dial-up the Activation to use if the lock shown in section 3 is another Number dialing remains ineffective. Now has the end-of-election signal or the busy response the task of switching over to an increased charge in the automatic counting device to prepare so that the participant's first post-pulse causes this switchover.

Operationally, the process takes place as follows. Of the participants. finds a remote connection busy. If he chooses the To pay increased fee, he dials a digit (e.g. i or 2) and is able to to connect to the existing local connection. Will then Local call ended, so (let the desired long-distance connection come through, so will the call is calculated as an urgent call with the start character.

A connection in local traffic is still only the long-distance office possible because the subscriber in the local network does not generate a remote number so cannot prepare the connection in the line selector. In long-distance transport and in Self-dialing long-distance traffic, on the other hand, has the same rights as the long-distance office and subscribers. A Intervention in long-distance calls is prevented by remote identification.

Claims (3)

PATENT CLAIMS: i. Circuit arrangement for telephone systems with self-dialing long-distance traffic, characterized in that for the remote identification of connections in the outgoing direction, the timing of the counting in local traffic and self-dialing long-distance traffic is designed differently, in that the first counting pulse in local traffic takes place at the end of the call, in self-dialing long-distance traffic, on the other hand, at the start of the call and is used as an indicator to distinguish a long-distance connection from a local connection in that in a long-distance connection the first counting pulse emitted at the start of a call in the preselector or call seeker actuates an existing relay (R, Fig. i) or an additional relay (F, Fig. 2) , which binds and on the Prüfast (c) of the preselection device the identifier of the remote connection, z. B. ground potential, transmits, while with a local connection in which the first counting pulse occurs only after the end of the call, the actuation of this relay is omitted. 2. Circuit arrangement according to claim i. characterized. (For remote identification of the incoming direction, leave the incoming (Ü ank .. Fig. 3), regardless of whether it was occupied by the long-distance exchange or by the subscriber, to give a local remote identification in the direction of the controlled local direct current network (Fig. 3, right), while the remote identification of connections that rielimen their exit in the local direct current network (AN). 3. left). only from the remote office. 3. Circuit arrangement according to Claim t and 2, characterized in that for ringing in the hand-switched Long-distance traffic if ringing is prevented in self-dialing long-distance traffic, the end of dialing signal in the self-dialing Fc @ rnverkehr in the counting device (ZZ, Aüb.3) of the sell) dialing remote connection or in the outgoing L'1> transmission (Ü ab., .11) l. 3) another impulse after you have finished dialing the number, thus suppressing ringing, while via the outgoing transmission controlled by the remote office (C '"ex., Alb. 3) Ordinary post-impulse as a switch-on impulse, possibly also as a disconnect and Naclil'iuteimpuls are passed on unhindered and thus the switching, disconnecting and: cause \ acliläute% -organ.g in the line selector. Circuit arrangement according to claim i to 3, characterized in that (let increased atif to switch the counting device Fee for approval of atif circuit in hand-switched long-distance traffic and in self-dialing long-distance traffic the end-of-dial character the counting device of the selector: ilil-l, ern connection, if applicable also the counting device of the remote office, preparatory so reversed. (let him first: Post-impulse from the subscriber or the remote operator the metering device for increased fee switches.