KR960009479B1 - Automatic exchange system for ship radiotelephone - Google Patents

Abstract

None.

Description

[Name of invention]

Automatic exchange system for ship radiotelephone

[Name of invention]

The introduction of the CM8300 system by Italian radio-shore-stations is an advance for the modernization of ship radiotelephone services, but the present inventors allow the on-board user to dial the desired telephone number directly and perform manual operation. It was considered necessary to study a more advanced technical solution consisting of introducing an auto attendant telephone system accessible to the operating wave. The new system enables automatic calculation of calls, flexible management of available telephone lines, and the execution of fast statistical controls, making more efficient use of available resources. The system, managed by the host computer, can be quickly reworked at any time in response to traffic demands.

The manual operating system CM8300 and the autonomous system CM8600 are both licensed Nos. IST / 5.3 / 2/2/22 and 5/3/2/3 /, licensed October 3, 1985 and November 8, 1986, respectively. No. 27 was approved by Istituto Superiore delle postee Telegrafi in Italy.

The auto-switching telephone system (called CIMAT-CM8600 by the manufacturer) is made of highly specialized software and uses precise data transfer technology to ensure data exchange between coast stations and shipboard devices with great success re-probability. do.

Moreover, the coding system used ensures the certainty of the addressed information as a necessity of the telephone system. For better reliability, the onboard user can exclusively use a secret code (password) that can control his device, can be entered through the keyboard, and can be determined by the coast station host computer. Can be.

In addition, the user may monitor the connection state through the display, and after completion of the call, the user may receive a time to be charged. This direct dial system is an extension of the ship radio derating system of the CIMAT CN8300 family.

Full coordination and flexibility of the system allows the system to be expanded at any time and to change the structure of each channel processor according to the required traffic, available lines, and the operating requirements of the radio station.

A central processing unit (host computer) is provided for the maintenance and management of ship and subscriber files and for the recording of data relating to the calculation of conversations carried out. In addition, software is provided to check the traffic executed and to manage the resources for data delivery to other data processing centers.

The structure and characteristics of the automatic exchange system (CM8600 system) according to the present invention are as follows.

Ground-mounted device (ground device)

Automatic Dialing Processing Unit GTP001

The unit is connected to the coastal passive system CM8300 to perform direct dial telephone service and includes the following modules:

2 signaling module CL007

2 Logic Modules TL003 / 2

2 servant interface module CL007

2 scrambler module MS001

2 connection module CM002 / 2

1 Receive Module CL004 / 2

1 microtelephone module CM005 / 2

1 Power Supply Module SWP010

Processor Unit HC8600 (Host Computer)

The unit processes a database related to the management of systems, users and billing, and includes:

1 host computer HC8600

1 monitor and keyboard

1 printer

Shipboard Device (UTR001)

The onboard device interacts with the coast station and interacts with the system via the Digital Switching Protocol (AUTOLINK RT). The unit now includes interface circuitry for connection to the onboard wireless receiver and has a coding and decoding device similar to that mounted in a ground-mounted system.

The linear terminal may be connected to an entire duplexer or a biplexer already existing on board.

The onboard device enables monitoring of free channels and telephone numbers selected by the caller; The front panel display shows the status of the call and the keyboard allows the user to enter a password and select the appropriate telephone number (which can memorize ten different numbers).

Ports may be provided for connecting to peripheral units, such as data transmission devices (voice codes may be mounted therein), such as printers, video, call signaling devices, telex faxes, and the like.

The unit is used to make direct dial radiotelephone calls through any coastal radio station equipped with a CIMAT CM8600 automatic direct dialing system.

Technical feature / functional feature

Automatic Dialing Processing Unit (GTP001)

The unit consists of 19 3EU standard units. It can handle two radio channels, allowing coastal radio operators or management engineers / technicians to monitor direct dial call connections, and also manually interrupt calls on the ground or onboard side of the connection. .

The radio channel processing module in the unit has the function of linking up (via a duplex or simplex radio channel) with the corresponding onboard device. The module includes logic circuitry for handling the interface with the radio, coding and decoding circuitry for command exchange between onboard and shoreline, connection with onboard users and connection with telephone lines for routing ground subscribers.

Each unit can handle up to two automatic telephone lines on two or four core cables.

The connection between the shore and the onboard device is made by a digital word containing the onboard user's identification code (AUTOLINK RT protocol).

Larger connection control is achieved by FSK modularization and data transfer through the construction of digital words so that vertical part control is the correct connection. All transmitted voices fall within the telephone band and apply to standard international CCIR.

The modular nature and full functional independence of a single signal allows the system to expand freely on a channel-by-channel basis. The modular nature also facilitates system maintenance.

Since system parts are standard parts, supply and replacement can be made quickly and easily.

In addition to the unit, it has a microtelephone which allows the monitoring and management engineer / technician to control the connection with the user.

Data Exchange Protocol (AUTOLINK RT)

The message exchange between the onboard device and the shore predicts the master (dock) that initiates the connection session to the slave providing reply (Ack and Nack) to each message. Messages exchanged in both directions always bring back the indication of the master (serial number) so that it is not decoded by other devices listening on the same radio channel. When the slave receives an incomplete message or receives a parity error, three retries include a data exchange protocol that prepares for a response (message Nack) to another device after repositioning to an idle state.

The exchanged message is of the following structure:

Data message structure

Data messages have the following format and contain ASCII characters (in the message field they are sent in compressed form).

The header consists of ASCII STX (decimal 02) characters.

The message field has a 9 digit boat number (coast mobile service identification number-MMSI), a 1 digit message type, and a variable length data field with zero length for some messages that identify the ship terminal to which the message is sent or addressed. .

The end of the message consists of two character parity checks before the carriage return character.

Content of the message field

Apart from the ship number portion of the message field, it has the contents of several message fields:

Ship-to-shore message

The next message type can be sent from the ship to the coast.

Coast station message

The next message type can be sent in coastal direction.

Coast to Coast Function (Motion)

In order to establish a coast-to-shore call, the system must be extended with a telephone line processor unit that receives incoming calls on the basis of a dedicated radio channel and certain hardware connections and decodes the required number (ie MMSI versus vessel).

Central Processor Unit HC8600

The computer holds the ship's name and associated data. The software program performs the necessary checks and allows the busy user to use the telephone service and to analyze the required telephone number.

After processing the data received from the shipboard unit, it has the function of sending the information by the automatic unit (GTP001) to find a suitable free line, and also storing the data related to the telephone call to send the billing statement, and It has a function to print wireless telephone communication in real time.

The computer can also store all the data needed to charge the call, form the print out of traffic, display peak traffic periods, as well as perform the required statistical analysis.

The design of the software chosen for the system was specially developed to facilitate its use, maintenance and future development in malfunctioning environments.

The choice of hardware is chosen according to the number of channels required, the users involved and the stored user traffic.

The system architecture is provided as a set of processes and arrays that can allow:

Performing automatic radiotelephone traffic with a choice of available resources and signaling to allow users on board to process connection status;

-Continuous monitoring of link status and ongoing traffic with menus and suggestions to facilitate human-machine interface;

-Progressive achievement of flexibility and additional features;

-Update of the ship's database;

-Management of the data necessary for the billing and printing in real time thereof;

-Backup and data storage of the system;

– Input and identification of operator codes;

-Connect the remote terminal to the computer unit.

Technical description and mode of use

Automatic Dialing Processing Unit GTP100

In functional terms, the automatic unit is divided into two basic parts. That is, it is divided into an analog part and a logic part. The analog part transmits the voice band signal and includes a device for passive interference. The logic portion includes circuitry for transmitting and receiving data and for processing automatic telephone lines. The interface with the host computer is arranged in this part.

Microtelephone Module CM005 / 2

The module is used only in manual mode, allowing communication between ground stations and vessels (and offshore users) when providing assistance or performing maintenance to offshore users who have experienced some form of difficulty.

Microtelephony modules include amplifiers for microtelephones and jack plugs for headphones and microtelephones; A semiconductor communication system (CMOS) for connecting a microphone to a radio channel or a telephone line; A circuit calling system for a wireless channel.

Connection module CM002 / 2

The CM002 / 2 processes simplex and duplex connection seeds and lands. Access to the current wireless device is made by the SWL03 module supporting voice RX / TX with control signals and balanced outputs / inputs (PTT / Fine / Alarm).

The voice transmission in the module follows two different courses: one is the routing of voice transmissions to the CL007, which represents the FSK modem and monitors the data exchange with the onboard terminals; The other is routing to SWL01, the next line and interface.

Routing of voice transmissions to the SWL01 module under normal operating conditions of the system is done by the central processing unit (CPU) placed in the -TL003 / 2 module only when the dialing of the telephone number is completed. There is also an option to perform the manual functions of the system.

In this mode, there are four mutually exclusive actives (RADIO, LINE, LISTENING and CONNECT). RADIO and LINE allow operators / technicians to connect to sea and ground users. LISTENING allows the operator / technician to monitor the conversation through module CL004 / 2. CONNECT allows the operator / technician to establish a connection between ground and sea users. Finally, the CM002 / 2 module is equipped with a two-level indicator to control the RX and TX voice transmissions.

Receive Module CL004 / P

The module indicates the channel over which the call is taking place and includes circuitry for activation of a speaker to listen to a radio channel conversation.

Logic Module TL003

The central processing unit (CPU) controls and processes all modules, including the system. It can also be connected to an external computer via the serial port RS232C. When connected with a computer, it can affect the configuration of all parameters of the radio and telephone lines (ie individual category periods) and of the parameters of the system. When the configuration is complete, the information is stored in memory.

Signaling module CL007

The module is a dedicated card for FSK conversion and logic control of the serial signal of the communication protocol performed via the integrated modem AMI / 7910 (or the like) of the advanced micro device, and has the following functions.

Logic function

Logic functions performed by the module are display of signaling status, telephone signaling recognition, telephone signaling generator state generation: CONNECT RADIO LINE, voice / data switching.

[Display of Signaling Status]

The status of the phone signaling is displayed on the front panel of the module via LEDs indicating the active phone range. The generated range and the received range are displayed.

[State occurrence]

The system must handle radiotelephone calls in the same way as a manual operator, be able to activate the radio transmitter (an important function), and connect sea and ground users. Line and wireless keys are not activated in automatic mode.

[Voice / Data Switching]

The standby state of the system state is typically in SPACE transmitted by the modem in tones at 1,180 hertz. The tone is interpreted by the linear terminal as a free channel. The related signal is transmitted by the modem as a MARK and is a tone of 900 hertz.

The data signal is generated by the modem as a change between these two frequencies. Voice communication may start the selected telephone line and dial number when the data transfer is successful.

Voice / data switching is performed by the control of the firmware in accordance with the mode determined by the communication protocol.

Scrambled Module MS001

The scrambled modem codes and decodes voice transmissions between the onboard unit and the terrestrial receiver. This keeps the call secret to all unwanted listeners on the wireless network.

Current coding is achieved by inverting the variable band frequencies according to the 32 combining patterns. It is possible to implement the system with control logic to modulate 32 times the inversion frequency for each cycle, and the algorithm control inversion will be different for each individual user.

Shipboard unit UTR001 (AUTOLINK RT)

The onboard unit UTR001 is a simple and compact construction, connected to the current onboard radio by a DIN connector and can be connected to a duplex or duplex using a microtelephone jack plug. The front panel is completely covered with a polycarbonate membrane that surrounds the keyboard and display and is completely waterproof.

The telephone keyboard is a standard type. The alphanumeric display is a 32-character LCD type and comes with a light screen. The display allows the user to monitor the selected phone number and select from ten memorized phone numbers. The display also allows the user to monitor the status of an ongoing call and to read the talk time at the end. Display signals and instructions can be programmed in any language.

The onboard unit UTR001 is based on CMOS microprocessors and is connected to peripherals to handle real-time and baudrate interrupts, handle two serial full duplex channels and control alphanumeric displays and keyboards.

Integrated circuits with programmable logic provide all additional signals such as buzzer control, voice / data switching, key function (PTT) and modem function selection. Among the two serial channels, the first connects the modem and the second provides the CANNON RS232C for external connectivity for future expansion and applications (user call codes, printer output, fax e-mail, etc.).

The main part of the analog section is the Am7910FSK, standard according to Bell 103/113/108/202 and CCITT V.21 / V23. The modem is programmed to operate in CCITT V.21 mode 300bps full duplex. The power supply to be used with the unit can range from 10 to 55 DC volts, which is internally stabilized and suitably protected. The structure of the onboard unit UTR001 is completed by an EEPROM capable of holding infinitely memorized data (ie serial number, up to 10 telephone numbers) without power supply. The unit can also be further extended via a 26-pin connector, with one option being a voice scrambler module.

Call connection monitoring

The onboard user can monitor the call connection status using the display on the front panel of the UTR001. The main display message that appears is:

FREE: When the message appears, the user can know that the unit has already sent a call.

ENGAGED: If the message appears, the device cannot send a call. The message is sent from the coast station unit when another user makes a call. This prevents other users from distorting the message.

TX DATA: The message indicates that data exchange is in progress.

UNAVAILABLE: The message appears when the ground unit does not respond to a call from the onboard unit.

WATE: The message appears while the ground unit checks for data conformance sent from the onboard unit and verifies that the caller is authorized to use the service.

ERROR: The above information informs the onboard user that the ground unit did not allow the call and was not connected. This can happen for a variety of reasons, including invalid passwords, invocation code not found in the repository, or the user has not paid.

CALL ON: Indicates that the ground unit starts the process to connect the appropriate ground subscriber.

CALL OFF: The message appears when the ground unit has terminated the connection. The call duration also appears above the display adjacent to the CALL OFF message.

The following is an additional description of each module associated with the drawings.

Automatic Telephone Line Module (SWL01)

The module includes circuitry for interfacing a telephone line connected to a public telephone switching system.

Passive Telephone Line Module (SWL02)

The module is an interface towards a passive switching board. This is only used in manual mode.

Telephone line switching module (SWT01)

The module is 18 × 2 matrix, which is connected to dual channel consoles, namely automatic (OTC8600) and manual (OTC8300 and OTC8300 / B).

Monitoring Module (SWS01)

This indicates the status of the telephone line (free-access-failure).

Wireless Line Module (SWL03)

Interface transceiver radio set for voice and P.T.T range to CIMAT system.

Power supply unit (SWP01)

Operation console (OTC8300)

It is a console that allows the operator to activate passive dial-up ship-shore and coast-ship.

Telephone Line Processor Unit (TCL001)

This allows the operator to select the appropriate telephone line to take advantage of ship-shore and coast-boat connections.

Operation Post Unit (TCH001)

The operator can process the radioset in simplex and duplex. The unit allows the operator to establish a wireless telephone connection and monitor wireless transmissions.

Supervisor Console (OTC8300 / B)

Connectivity is similar to the OTC8300, and the operator can also monitor and process wireless transceivers connected to the central unit.

Telephone Line Processor Unit (TCL001)

Used for the OTC8300.

Working post unit

Used for OTC8300.

Service unit (TSS001)

This allows the operator to select which wireless device is connected to the central unit and to operate the tape recorder.

Signal and Command (TSC002)

The unit includes a module for remotely controlling the wireless device.

Auto Console (OTC8600 / B)

This handles the automated service and allows the onboard user to dial the required subscriber telephone number directly. This includes a power supply unit (SWP01) and a direct dial unit (GTP001).

Direct Dial Unit (GTP001)

The unit consists of a standard unit of 19 ″ 3EU. It can handle two radio channels, allowing coastal radio operators to monitor direct dial call connections, or manually interrupt calls on the ground or onboard side of the connection. The radio channel processing module in the unit GTP001 has a function of linking up the terrestrial subscriber to the corresponding onboard device. The module can interface with radio (SWL03), coding and decoding circuitry for command exchange between onboard and shore, connection with onboard users and routing calls to ground subscribers (SWL01 telephone line interface module) via SWT01 switching module. A logic module for handling the connection with the telephone line.

Central processor unit (HC8600)

The computer has a name and a password associated with it. The software program performs the necessary identification of the caller, verification of the permission of the telephone service and analysis of the required number. When the computer receives data from the onboard terminal via GTP001 (direct dial unit), it sends back a command to find a free telephone line.

Claims (1)

It has electronic circuits for connection to public telephone networks, dialing, automatic connection of lines and exchange of central components, and operates on automatic six-wire and two-wire lines, for coast-to-shore data exchange, signaling sequences and digital words. A terrestrial device that establishes synthesis (AUTOLINK RT) and manages the logic of the central processor and the hardware and software logic for the public telephone network and radio set; Has hardware and software management logic for electronics and information and code, sets up shore-line-to-shore data exchange, signaling sequences and synthesis of digital words, connects directly with peripherals, alphanumerics for phone numbers and connection status Onboard devices using a password to monitor the display and allow use of the system; And a message exchange between the ship and the coast predicts a master (side) that initiates a connection session to a slave that provides an acknowledgment (Ack or Nack) to each message, wherein messages exchanged in both directions are on the same radio channel. Always bring back the indication of the master (serial number) so that it is not decoded by the other listening device, and if the slave receives an incomplete message or receives a parity error, three retries will re-enter the idle state. A data exchange protocol for preparing a response (message Nack) to another device after being located, wherein the exchanged message is structured as:

The header consists of ASCII STX (decimal 02) characters, the message field comprising a 9 digit boat number (coast mobile service identification number -MMSI) identifying a ship terminal to which a message is sent or addressed, a 1 digit message type and It has a variable-length data field with zero length for some messages, and the end of the message consists of two character parity checks before the carriage return character, independent of the double number portion of the message field, the contents of the various message fields: Having

The message is sent from ship to ship as a ship-to-ship message,

And said message is a coast station message transmitted from the coast to the ship.

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