RU34832U1 - PUBLIC TELEPHONE AUTO - Google Patents

Description

PUBLIC TELEPHONE AUTO

The utility model relates to the field of telephony and can be used to provide local, long-distance and international communication services to subscribers, namely, to provide voice communication from a public payphone on a prepaid basis.

A device is known for providing voice communication services to subscribers from a public payphone on a prepaid basis (public switched telephone - payphone, EP Dubrovsky "GTS Subscriber Devices: Reference Book., 4th ed., Revised and additional, M. : Radio and Communications, 1986, p. 139), which is the prototype of the proposed utility model and consists of a telephone (TA) with analog input and output connected to the communication channel, and a charging unit (BT) associated with the TA. An analog communication channel (ACS) is a subscriber line of a public switched telephone network (PSTN). When the caller’s TA is connected directly to the PSTN subscriber line (Fig. 1a), a switched end-to-end channel is allocated for his conversation with the called subscriber, which is in their full possession regardless of its load (voice or pause is transmitted). This approach is quite expensive, especially in the case of international calls.

At the same time, there are digital communication channels (CCS), in which it is not necessary to allocate a coordinated channel for the entire duration of data transmission (Intranet, Internet). This is achieved by the fact that for transmission over the central digital data center, the data is divided into packets that are transmitted independently of each other, and at the destination they are again combined. When broken down into packets, data is compressed, which additionally increases the throughput of the DSC. Thus, the transmission of the same amount of data on the CSC is less costly than on the ACS, and the channel requirements are less stringent. For transmission

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sound signal (speech) on the CCS, it must be digitized, compressed and broken into packets. To receive it is necessary to perform reverse operations.

The objective of the proposed utility model is the adaptation of a public payphone containing a TA with analogue input and output, to transmit voice messages over the CCS.

This problem is solved by the fact that in a public payphone, consisting of SLTs with analog input and output connected to the communication channel, and BT connected with SLT, a digital channel is used as a communication channel, to which SLT is connected through an additionally entered unit adapter (BA). The BA performs the functions of matching the analog input and output of the TA and the CCS.

The technical result of the proposed utility model consists in the fact that the transmission of digitized, compressed and packetized audio signal via the DSC significantly increases the throughput of the communication channel and reduces the requirements for its quality, because It does not require constant maintenance of the end-to-end channel between the calling and called subscribers, and compression reduces the amount of transmitted information (while pauses in the conversation practically do not load the line).

Further, the digitized signal is transmitted via the DSC (Intranet, Internet) to the adapter unit closest to the called subscriber, which combines the packets and converts the digital signal to analog. The latter is fed directly to the input of the called subscriber's TA (Fig. 16), or transmitted to the PSTN in close proximity to the called subscriber and then via the ACS with constant channel switching to the called subscriber (Fig. 1c). Due to the fact that a significant part of the distance between the calling and called subscribers falls on the digital channel, the cost of communication between them is reduced. The transmission scheme given in the description of this utility model

the digitized and compressed signal from the public payphone to the connection with the called subscriber via the central telephone exchange and PSTN serves only to explain the possibility of using communication between them via a digital channel (IP telephony) and does not apply to the essence of the claimed utility model.

Thus, the operational costs of transmitting a voice signal during a telephone conversation are reduced, which is most pronounced when talking over long distances.

The proposed technical solution is illustrated in more detail as follows; it is a block diagram of the device (Fig. 2). A public payphone consists of TA (1), BT (2) and BA (3), while BT (2) is connected to TA (1), the analogue input and output of the latter are connected to BA (3), and BA (3) ) is connected directly to the CCS lines (4). Lines CKS (4) are not part of the inventive device, and are shown only to explain its design.

The specific implementation of all these blocks can be any. In particular, BT can accept coins, tokens or cards, etc .; TA can have a disk or button dialer, built-in or remote handset, etc.

The device operates as follows. When you remove the handset TA (1) and dial the number on the dialer TA (1), the output of the analog signal from the TA (1) is carried out only after polling the BT (2) and receiving an enable signal from it. BT (2) issues an enabling signal to TA (1) after the prepayment made through it (coins, tokens, cards). The analog output signal TA (1) enters the analog part of the BA (3), which digitizes it, compresses it, splits it into packets, and transmits them to the CCS (4). When establishing a connection with the called subscriber, a digital signal (digitized compressed speech) comes to the digital part of the BA (3) via the DSC (4), which is unpacked, converted into an analog signal and transmitted to the analog input of the TA (1); The connection of both subscribers is supported up to and t 1 2 scooping the size of the prepayment made through BT (2) according to the established arith in the direction of the conversation. Specific examples of the device. .Analog telephone adapter ATA-186 from Cisco (BA, item 3, Fig. 2) is located inside the housing of the TMS-1517 K4 payphone manufactured by OAO UPP Vektor (Ekaterinburg). The payphone consists of TA (pos. 1 fig. 2) and BT (pos. 2 fig. 2), placed in a common building. TA output signal (1) appears upon receipt of an enable signal from BT (2) after confirmation of the prepayment made (chip card). The analog input and output of the TA (1) are connected to the analog part of the adapter (3). The digital part of the adapter is connected to the CCS (Intranet), through which the digitized sound signal is sent to the server of the IP-telephony operator (and vice versa). The latter routes the call to the Internet in accordance with the dialed number and the configuration of its IP-telephone network. (The Intranet, the Internet, and the operator’s server are not part of the proposed utility model and are only mentioned to explain the operation of the claimed device). .Analog telephone adapter (3) is installed outside the housing of the payphone (items 1 and 2 of Fig. 2) TMS - 1517 K4. At the same time, the scheme of their connection remains the same: BT (2) is associated with TA (1); TA analog input and output (1) are connected to the analog part of the adapter (3), the digital part of which is connected to the CCS (4). Placement of BA (3) outside the payphone housing may be appropriate for the following reasons: a) The adapter has several analog inputs / outputs (ATA-186 has two inputs / outputs), which allows several payphones to be connected to the same physical adapter device. In this case, one physical adapter device will perform the function of several BA simultaneously for different TAs. So, if one ATA-186 adapter is located inside the housing of one payphone, then

for the second payphone connected to the same adapter, the BA turns out to be located outside the case. There are adapters that allow you to connect up to 32 SLTs at the same time (for example, the Sumsung company IP-telephone gateway SMG3200). Naturally, in this case, BA for most of them will be placed outside the TA housing. b) The access point to the CCS may not coincide with the location of the TA and BT. Then, the BA is located at the access point, while the TA and BT are placed in an accessible place for subscribers. The connection scheme of BA to TA, BT to TA does not change.

The proposed construction of a public payphone allows you to provide prepaid communication services using digital communication channels (Intranet, Internet) that were previously unavailable. This leads to lower operating costs for telephone calls (with increasing distance, lower costs increase).

Claims (3)

1. A public payphone, consisting of a telephone set with analogue input and output connected to a communication channel, and a charging unit associated with a telephone set, characterized in that a digital channel is used as a communication channel, to which the telephone set is connected via an additional entered adapter block. 2. A public payphone according to claim 1, characterized in that the adapter unit is located inside the telephone set. 3. A public payphone according to claim 1, characterized in that the adapter unit is located outside the telephone set.