SU56783A1 - Switch system of the Central Bank with two-wire cord pairs and with restriction of the right of automatic access of subscribers to automatic telephone exchanges in end-to-end dialing - Google Patents

Description

The present invention relates to a switch of a central bank system with two-wire cord pairs and with restriction of the right of access of subscribers to automatic telephone exchanges during pass-through dialing.

According to the invention, for automatic exit of subscribers to outgoing connecting lines, call finders are applied to the PBX, controlled by a button installed on the subscriber’s device having access to the PBX and turned on so that when pressed it is shunted by the subscriber’s linear relay The call relay of the BP started up call finders.

To use the switchgear equipment of the CB system, on installations with limited rights for automatic logout of subscribers to PBX when dialing through from a subscriber, a cabinet of additional equipment is installed, which has an intermediate cross-connect field, which makes it possible to remove the restriction from the ends of the cross-over cord

some subscribers and restrict others.

The additional equipment cabinet has: a) subscriber relay kits, b) trunk relay kits, and c) call finders. In addition, the pulsators for the start-up of call pickers and the pulsator for connecting lines are mounted on this cabinet.

The invention is explained in the schematic diagram of the device.

In order to get a connection with a local subscriber, the calling subscriber removes the handset from the lever of his device.

In this case, the current flow will be: minus of the battery, linear winding of the BP relay, spring of the socket H, contact / -2 of the PfJz relay, line, subscriber unit, line, contact / -2 of the relay PfJi, spring of the socket H, winding of the relay LR, plus batteries.

Both relays (BP and LR) attract measles, the closure of their own overhead line contacts / -2.

In order to call

the local subscriber did not operate the Prii relay and could not install the search start pulsator circuit; contact 3-4 of the LR relay terminates plus these circuits.

Further operations for connecting to a local subscriber are performed in the usual order.

To exit to the PBX, before picking up the handset, the subscriber presses the button Kn, as a result of which the line wire connected to the LR relay receives a connection to the subscriber’s device, i.e., with the CB plus.

This shunts the linear relay, and as a result, now, when it is removed from the lever of the microphone, only the call relay BP will work.

As a result of the fact that the LR relay will be at rest, and the BP relay will not, via pin 3-

4 relay LR and contact 4-5 of the relay BP will be fed plus to mark the occupancy on the sleeve of the socket G; In addition, through the same contacts, the RP relay will receive power, which, having drawn its own measles, will switch contacts from 1-2 to 1-3, as a result of which the subscriber’s plus button will be applied to the corresponding contact of the call finders.

At the same time, the PFIi relay with its contact 4-5 will close the power supply circuit of the start-up pulsator, and the latter will come to work, chasing the call seekers to search for the caller.

At that moment, when one of the searchers finds the caller, the brush with will come up on the corresponding contact of yes, has prepared the PHz relay circuit.

As soon as the brush and comes to the contact, which has a clean plus through the button of the subscriber, the POi relay doesn’t have its own measles, there is a gap in the contact 4-

5 chain of supply winding seeker Claim of this set of connecting line.

At the same moment, contacts 1-2-3 of the relay RO are closed; the current circuit is established through the windings of the relay RJa and relay P02.

As a result, the RP relay contact / -E switches the subscriber's line to the brushes a and b of the searcher and through them to

the outgoing connecting line to the PBX, in contact 4-6, breaks the power supply circuit of the pulsator, and in contact 4-5, closes the power supply circuit of the RP relay, and the busy level circuit on the subscriber socket sleeve.

In addition, the ROH relay, after bringing its own measles, will close, with contact 6-7, the circuit of the PBX line through the winding of the LSRS relay, as a result of which the PBX devices will start working.

In this regard, the subscriber will hear a dial tone in the telephone, inviting him to dial the number of the requested PBX subscriber. When, on returning, the dial of the subscriber's dialer will cut off the power of the P0i relay, the latter will pulsate, broadcast in contacts 6-7 dialing pulses on the PBX.

However, during dialing, the remaining occupied circuits will be in the closed state, since the P / 7i relay and the POg relay have a delayed: action.

When the subscriber hangs up after the end of the conversation, the POi relay releases its measles, opening contacts b-7 and / -2-3.

In contacts / -2-3, the power supply of the relays and the POz relay is energized, and the entire circuit returns to its original state.

In the event that all the connecting lines with the PBX are occupied, the contacts / -2 are closed on all LSRSL relays and through them, the power supply circuit of the pulsator is set.

The latter will periodically close the buzzer circuit of the Zoom and primary transformer IK.Z3 transformer, as a result of which the voltage of the busy signal is induced in the secondary winding of the latter.

If now a subscriber picks up the phone, then as a result of contact closure 5-6 of the BP relay, he will hear a busy signal in the telephone, the currents of which pass through the additional winding of the BP relay and are induced in its linear winding.

In order for the subscriber not to hear the busy signal when calling the local subscriber, the secondary winding circuit of the IKZ transformer passes through pin 5-6 to the opening of the LR relay of the subscriber.

The subject matter of the invention.

A switchboard system with two-wire cord pairs and with the restriction of the right of automatic access of subscribers to automatic telephone exchanges with end-to-end dialing, characterized in that, for automatic access of subscribers to

outgoing connecting lines, to PBX, call finders are applied, controlled by a button installed on the subscriber’s device having access to the PBX, and turned on so that when it is clicked through the subscriber’s linear relay ground, the call relay starts up the call finders .

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