DE2418745C2 - Circuit arrangement for counting local time in telephone exchanges - Google Patents

Description

45

Time pulse counting is used to record the charge for a long-distance dial-up connection. Here During the call, counting impulses are transmitted at intervals that correspond to the zone of the destination are dependent. After determining the necessary A counting pulse generator after a successful connection is established Counting pulses are applied to the connection, which is then sent by a corresponding registration device be included.

In local exchange technology, single counting is currently carried out; that is, it becomes independent on the duration of a call of the registration device assigned to the calling subscriber is only supplied with a registration pulse evaluated with the basic fee unit. In the course of the introduction of electronically controlled dialing systems is discussed the possibility of the participant for no longer allow a charge unit to speak indefinitely in the local network, but also for local calls to take the duration of the call into account when calculating the charges by counting the time. It So even during a local call, counting impulses were set at a given time interval be forwarded to the respective fee registration facility. With the introduction of such a time counting could, among other things, the danger of blocking of electoral levels and line sections by long speakers be decreased. It would also be possible to introduce a discounted night tariff in the local network, with which the network could be relieved in the rush hour.

Should now with the introduction of a new dialing switching system the transition to a time counting in local traffic must also be made a corresponding adaptation of the previously existing dialing systems, as these will take place over a long period of time Will remain in use during the transition period.

It is the object of the invention to provide an arrangement for carrying out a local time count for one to create a telephone exchange that is already in use with a minimum of effort only requires minor changes to the existing system for the changeover.

In a dialing system in which the counting pulses are used to receive and forward incoming counting pulses Receiving switching means in the dialing stage which separates a long-distance connection from local traffic Can be directly influenced via the switching arm of the selection device connected to the relevant control wire is, this is achieved according to the invention in that the looped into an additional device Control wire depending on the message identifier with the exception of those used for a remote connection Position of the switching arm applied to the specified counting cycle for actuating the receiving switching means is that this counting clock from a directly supplied to the device and compared to this a clock having increased clock frequency in a manner known per se by means of a clock in the device contained reduction stage is derived.

By the fact that the control wire, which influences the receiving switching means, in the additional device is looped in to apply the counting cycle, such a device is only used per dialing device necessary. By converting the clock supplied to the facility into the clock to be created Counter clock, a timely use for local time counting is achieved. In the case of a remote connection, the Previous control of the receiving switching means received, as the required ground potential via the switching arm is applied to the control wire and thus to the receiving switching means and in such a case by the additional The facility does not submit the counting cycles to be applied for a local connection.

According to a further development of the invention, a control wire that is dimensioned in this way is attached to the looped-in control wire Capacitor connected to earth potential, which occurs when the continuous counting voltage is applied to the relevant Core of the connecting line, the receiving switching means is initially immediately effectively sounded.

This is an advantage when the changeover is to be made, as it does not disadvantage the participants either the conversion of the switching facility over a longer period of time can be made. If the clock supply is switched off after the installation of the additional device, it will be appropriate the previous single counting initially registered a counting pulse. Only with the connection made the clock generator for deriving the counter clock provided for the local area is then the final one

Changeover to local time counting.

According to a further embodiment of the invention, the signaling carried out by the called subscriber when the handset is hung up leads to the response of a related evaluation element in the additional device, whereby the disconnection of the control wire influencing the release of a connection and also looped into this device is effected.

An exemplary embodiment of the invention is shown in the drawing shown that only the essential components contributing to the understanding of the invention contains.

The in the circuit excerpt of a first group selection level of an existing dialing system, z. B. of the system 551 ', the counting circuit shown contains the counting transmission relay Z, which initially serves as a receiving switch for incoming counting pulses. This relay switches the circuit for the counter individually assigned to the subscriber in the local exchange or initiates the forwarding to the counter at the subscriber station via corresponding contacts arranged fee indicator.

The Zählübertragunsrelais Z is connected via the closure of the supply circuit to the transmission circuit dienenJen local line transformer OLLI with the fr-conductor of the line Cond. In a known manner, a symmetry halving consisting of the choke coil Dr and the capacitor Ct is inserted.

If a subscriber wishes to establish a telephone connection, his subscriber station is first connected via the I. group selection stage GW of his local exchange with a free counting pulse generator that works together with a zoner. Since the elimination of a long-distance connection from local traffic already in this first group selection level by dialing the traffic elimination number, e.g. B. the number 0, takes place, the switch arm Sd of the dialing device has set itself to the decade DO assigned to this number. Ground potential is now applied to the counting transmission relay Z via the control wire c /, so that it initially responds via the connected speech wire switch arms Sa and Sb, triggered by the reporting of the called subscriber, and emits a first charge pulse, not shown, to the charge registration device assigned to the respective subscriber. In a known manner, counting pulses for actuating the counting relay are then sent via the 6-wire at certain zone-dependent time intervals during the long-distance call.

The contact ph of a test relay PH, not shown, with which a lock against other occupancy is effective, is used to protect the voter arms. The contact ν is the contact of a relay V which is energized during each pulse transmission and serves to avoid distortions of the Wahlsiromstoß by disconnecting the a-wire.

The additional facility £ now contains those elements with the help of which a time can be counted in local traffic. About the charging current of the connected to the d-control wire against ground potential capacitor Cl is due to the reporting of the called subscriber to the

ίο Ö-wire applied continuous voltage, the counting transmission relay Z is activated and the first counting pulse is registered. The further counting pulses each leading to an actuation of this relay are now generated via the contact t actuated in the predetermined cycle. When the signaling voltage is applied, the counting cycle ZT supplied by a central clock generator is effectively released, since in this case !! In contrast to a remote connection, the permanent earth that causes the blocking is not switched on.

To ensure timely use, this counter clock ZT initially has an excessive pulse frequency compared to the desired clock sequence and is reduced in the structural unit LJ in the ratio specified thereby. A predetermined counting unit constructed in an integrated form can be used as the reduction stage. Triggered by the message pulse, an output pulse can be emitted, for example with a reduction ratio of 6: 1, after six time ticks have been received.

.10 den. This can be extended to the desired duration in a pulse shaper stage and the downstream switching device, e.g. B. in the form of the relay T, operate. The actuation pulse for the counting transmission relay Z is then given with the contact r of this relay T.

So that the counting current influencing this relay does not change abruptly, is in series with the Contact fine inductance /.

When the call is ended by the calling subscriber, a familiar one is not shown Way, triggering the!. Group voter.

In order to prevent the called subscriber from being blocked if the calling subscriber does not initiate the release of the connection by hanging up the handset, the identifier triggered by the selected participant when hanging up his handset is evaluated in the device E. The turned-in such a case in a predetermined pulse pause ratio of the a-wire Flaeker-clearing signal leads in the device E to the response of the relevant Auswerteschaltmittels S. The arranged in the c-wire within the device E contact 5 of this relay is then separated this wire, so that the connection is also released.

1 sheet of drawings

Claims (3)

Patent claims: T. circuit arrangement for carrying out a local time counting in telephone exchanges, in which the receiving switching means serving for the reception and forwarding of incoming counting pulses can be directly influenced in the dialing stage which is a remote connection from the local traffic via the switches of the dialing device connected to the control wire in question, characterized in that on the control wire (d) looped into an additional device (E) depending on the MeI-dekennzeichen with the exception of the position of the switching arm (Sd) assumed in the case of a * remote connection the specified counting cycle for actuating the counting pulse receiving switch means (Z) is applied that this Counting clock is derived from a clock (ZT) which is fed directly to the device and has a clock frequency that is increased in a known manner in comparison to this, by means of a reduction stage (U) contained in the device. 2. Circuit arrangement according to claim 1, characterized in that a capacitor (Cl) of such dimensions is connected to the control wire (d) that with the connection of the continuous counting voltage to the wire in question (b) of the connecting line (Ltg) the ic Receiving switching means (Z) is first switched immediately effective. 3. A circuit arrangement according to claim 1, characterized in that the signaling carried out by the called subscriber when the handset is hung up leads to the response of a relevant evaluation element (S) in the additional device, whereby the separation of the triggering a connection influencing and the additional Establishment looped control wire (c) is effected.