RU2185038C2 - Method and device for establishing communications over switched line between subscriber stations of one subscriber number and selected station of other subscriber number - Google Patents

Abstract

FIELD: switched communication networks including public switched telephone networks. SUBSTANCE: method differs from prior art in that subscriber station call is identified by modem communication establishing flag whereupon call is assigned directly in case of established communication and within predetermined time interval, when communication fails, to subscriber station that does not use modem communication. Device implementing this method is distinguished from prior art by dispensing with additional command unit and calling subscriber station is selected first by turning on modem and establishing modem communication for connecting subscriber station in response to address pulse ; in case of modem communication failure call is addressed to subscriber station that does not need modem communication. EFFECT: simplified design, enhanced reliability of establishing communications. 2 cl, 2 dwg _

Description

 The proposed method and device relates to the field of switched communication networks, including public telephone networks.

 A known method and device (Method for connecting subscriber devices over a switched network and device for its implementation, patent RU 2013020 C1, 5 H 04 M 11/06. BI 9 of 05.15.99), according to which establishing a connection of subscriber devices over a switched network carry out with the preliminary formation of an additional command on the calling subscriber side with subsequent transmission to receive it on the called side to identify the call intended for the selected subscriber unit.

 The purpose of the invention is to automatically connect the required receiver (source) of information (subscriber unit) via a dial-up line without generating an additional command.

 The basis of the invention is a method and apparatus for its implementation, which allows to provide in automatic mode through a switched network a mutual connection of one of the subscriber devices of various functional purposes (computers, PCs, television monitors, fax machines, carts and others) at the disposal of the subscriber of the calling party, with called subscriber unit of another subscriber.

 The proposed method differs from the method according to the aforementioned prototype in that the proposed method changes the procedure for establishing a connection by devices of two network subscribers, thereby radically improving the technological process of connection. The proposed method excludes operations on the formation, transmission, reception and decryption of an additional command necessary to identify the called device. To select the called subscriber device, the call is first determined to belong to devices operating with a modem connection, or to a telephone set. The determination of ownership is carried out on the basis of establishing a modem connection or its absence. A call received from the PBX serves to provide a modem connection on the called side. The modem switched on by transmitting the signal “readiness for establishing communication” informs the modem of the calling party. If the calling modem is turned on, then a response signal from it follows to "confirm" the receipt of the signal "readiness". In this case, the modem connection is established. For this reason, the calling party sends an address parcel through which the called device is connected on the called side. In the case when the modem connection is not established within the allotted time interval, the modem on the called side is disconnected and simulation calls, like calls of the PBX, are addressed to the telephone. Thus, the choice of the called subscriber device is carried out in two stages of election: first, by fixing the establishment of modem communication, and if this connection is established, then by the address sending of the called device. If the modem connection is not established, then the call is forwarded to the telephone. Moreover, the call simulates a subscriber switching installation, which is implemented in the device according to the proposed method. With this method of establishing a connection between subscriber devices, the procedure of establishing a modem connection is accelerated and, thereby, the technology of selective connection of subscriber devices is improved.

 A device that implements the proposed method is a subscriber switching installation (ACU) connected to the subscriber line, and subscriber devices and a telephone are connected to the ACU itself. The invention relates to communication technology, in particular to the transmission of information over telephone switched lines.

 The device provides the implementation of the proposed method by turning on the modem on the called side by a call signal from the exchange. From the switched on modem, the connection ready signal is sent to the calling party modem via the established connection, and a confirmation signal is received in the set time interval to establish communication with the calling side modem. By turning on the modem, the subscriber picks up the handset at the same time. When a modem connection is established, an address package is sent from the calling party, by which the called subscriber unit is selected. If there is no “confirmation” signal from the calling party’s modem for a given time interval, the called party’s modem is turned off and simulation call signals are sent to the telephone.

 The proposed device differs from the prototype mentioned above in that it does not have a unit for generating, transmitting, receiving, and decrypting an additional command for identifying the device selected by the call on the called side.

 To identify the called device in the proposed device, an on-mode unit (it is also turned off, if necessary) of the modem by a call signal from the exchange is entered. The modem is turned off if the modem is not turned on on the side, which means that a signal of "confirmation" of readiness for communication from the calling party modem for the allotted time period has not been received. Upon receipt of a signal of "confirmation" of the readiness of communication from the modem of the calling party, modem communication is established. In this regard, the called party receives the address package, by decryption of which the called subscriber unit is selected and switched. The connection of subscriber devices using modem communication is completed.

 In the case of turning off the modem on the called side after a set period, the simulated call signals from the ACU are sent to the telephone. The first call signal is blocked by connecting the blocking block, but it is possible not to block this call if the subscriber of the number does not pick up the handset before the second call signal arrives at the telephone set.

 The method is illustrated in FIG. 1 and 2.

 Device 1 — a subscriber switching installation — is connected to subscriber devices 2, including a telephone, a call and answer unit 3 and a subscriber line 4, comprises a data transmission unit 5 with a modem, a control and switching unit 6, a station signal reception unit 7, block 8 for turning on the modem according to the PBX call signal and its subsequent shutdown in the absence of a “confirmation” signal for establishing modem communication from the modem side of the calling party for the allotted time interval, block 9 for blocking the PBX call signal, block 10 tslezhivaniya timeslots.

 The essence of the device that implements the proposed method is as follows. The caller establishes a telephone connection to the called person through the exchange. The called subscriber inductor call through block 8 includes a modem. In addition, this call is blocked by the blocking unit 9 for the time determined by the unit 10 tracking time intervals, and the same unit after turning on the modem counts down the time interval allocated for establishing modem communication. After turning on the modem on the called side, the data transmission unit 5 with the modem sends a “ready” signal to the calling side to establish communication. When the modem is turned on on the calling side, a “ready” signal is received and a “confirmation” signal is sent to it to establish communication with the called side. The node 5 on the called side simultaneously with the reception of the "confirmation" signal receives the address package, which is decoded in the control and switching unit 6, as a result of which the selected subscriber unit is connected. After connecting the called device, the control and switching unit 6 sends a command to the unit 10 to stop counting the time interval allocated for establishing modem communication.

 When the “ready” signal from the modem is turned off on the calling side, the called side is not received in the set time interval, which means that the confirmation signal with the address message is not sent to this modem and block 10 sends a command to block 6 to turn off the modem by block 8, and from block 6 to block 9, a command is issued to unlock the call signal, which is forwarded to the telephone set 2 by means of block 7. Node 5 converts the signals of the subscriber units to the form required to transmit information by subscriber lines 4.

Claims (2)

 1. A method of establishing a dial-up network connection for subscriber devices, which consists in interconnecting, on a call signal, of one of the subscriber devices of the subscriber of the calling party with one of the subscriber devices of the subscriber of the called party, characterized in that a modem is connected to the called side by the call signal by transmitting the signal of “readiness to establish communication” informs the modem of the calling party, while from the modem of the calling party send a signal “confirmation” of the establishment of modem communication sending the address at which the connection of the subscriber unit, and in the absence of the signal "acknowledgment" for establishing dialup modem allotted time slot on the called side is switched off and to produce a call forwarding telephone.  2. A device for establishing communication over a switched network for subscriber devices, comprising a telephone station signal receiving unit connected to a control and switching unit, a PBX call signal blocking unit connected to a control and switching unit, a time interval tracking unit connected to a control and switching unit , and subscriber units connected to the call and answer unit and the control and switching unit to which the subscriber line and the data transmission unit with the modem connected to the call unit are connected and the response, characterized in that it entered the signal switching unit PBX call modem input and whose output is connected to the appropriate additional input and output control unit and switching the respective input and output data transmission unit with a modem.

Images