Ricoh Company, Ltd.

Nippon Telegraph and Telephone Corporation

Fumihiro Ogasawara

Toshifumi Shobu

Hiroshi Shibata

Noboru Sonehara

Shuichi Takahashi

Shinichiro Ozeki

Syuichi Ohta

Kazuo Asami

In a communication method for data terminal equipment, which communication method includes a function of forming a communication link comprising a plurality of B channels by having a calling terminal and a called terminal execute, via an ISDN, a plurality of call connecting procedures, and of effecting a data transmission by simultaneously using the plurality of channels of the communication link thus formed, the number of times that the call connecting procedures are executed is adjusted in accordance with conditions that prevail during a communication, and a data transmission is effected in the communication link comprising a plurality of channels, the total number of which channels corresponds to the number of times that the call connecting procedures are executed.

Method for selectively using one or two communication channel by a

A method of controlling a data transmission from a sending terminal to a receiving terminal through a plurality of data channels in an integrated services digital network. The method includes steps of sending a procedural message from the first terminal to the second terminal via the network, sending, in response to the procedural message, a connection message from the second terminal back to the first terminal via the network, the connection message including user-user data in which a request data is set to a second value, determining the number of the data channels used simultaneously for the data transmission in response to the connection message, received by the first terminal, in which the second value of the request data is equal to a predetermined value, and performing the data transmission from the first terminal to the second terminal by using the determined number of the data channels simultaneously.

Method for controlling data transmission of an integrated services

A frame transmission method for a terminal having system control unit, a reader, a recorder, an operator interface unit, and a communication control unit. The system control unit includes a line memory, which is connected to the reader and the recorder, and a buffer memory, which is connected to a flow buffer provided in the communication control unit, which, in turn, is connected to a transmission line or network. Thus, buffering in transmission of data is provided between the line memory and the buffer memory and also between the buffer memory and the flow buffer. With this structure, the data is transferred to the transmission line in frame format, and the frame transmission condition is varied by detecting the speed of production of data to be transmitted and/or the empty condition of the transmission line depending on the amount of the data to be transmitted accumulated in the flow buffer so as to optimize the transmission efficiency.

Frame transmitting method of a telematic terminal

A data terminal equipment which is coupled to an ISDN through an access line and uses a hierarchical protocol in conformity to an OSI reference standard model includes the following structural elements. A first data link protocol circuit provides a link access procedure balanced (LAPB) modulo-8 data link protocol. A second data link protocol circuit provides an LAPB modulo-128 data link protocol. A third data link protocol circuit provides a data link protocol based on a link access procedure for a data channel (LAPD). A protocol determining circuit determines a data link protocol to be used by referring to an address field and a control field of a cell set-up signal which is supplied from a second data terminal equipment. A data link protocol activating circuit selects and activates one of the first, second and third circuits on the basis of the result provided by the protocol determining circuit.

Data terminal equipment and data transmission control method

A communication control method of a communication system including a network, such as an ISDN network, and a plurality of main interconnection buses connected to the network through respective connecting units. A plurality of terminal apparatuses are operatively connected to each of the main interconnection buses. Each bus is provided with a signal channel, which is shared by the plurality of terminal apparatuses connected to the bus for call connection with the network, and at least one information channel for transmission of information in a multiplex format. In accordance with the principle of the present invention, when all of the information channels are occupied or in use, the signal channel is temporarily used as an additional information channel to thereby allow the other terminal apparatuses to carry out transmission of information.

Multi-terminal control system

A digital facsimile communication control method includes a step of selectively determining a data communication mode between a digital circuit switching mode and a packet switching mode. When the digital circuit switching mode has been selected, while optically reading an original to be transmitted, the amount of data stored for transmission is checked and also the time is checked. And, if the amount of data stored for transmission has reached a predetermined amount before the time has reached a predetermined time, the amount of data stored for transmission is formed into a frame of data, which is then transmitted. On the other hand, if the time has reached the predetermined time before the amount of data stored for transmission has reached the predetermined amount, an amount of data which has so far been stored is formed into a frame of data, which is then transmitted.

Facsimile transmission control method in which a frame of stored image

A method for controlling the sending of a response from a telematic reception terminal (teletex, G4 facsimile, and mixed mode) is provided. The receiver includes a PAMB counter whose count indicates the remaining number of page attribute management function blocks (PAMBs), each including predetermined various attribute data relating to each page, such as line density, coding mode, page size, page number and document number. When one of predetermined commands, such as a page boundary command or a document end command, has been received, the receiver checks to see whether or not the count of the PAMB counter is equal to or larger than a predetermined value. And if it has been found to be equal to or larger than the predetermined value, a response is sent to the transmitter. Thus, the transmitter is permitted to send the information of the following page. On the other hand, if the remaining number has been found to be smaller, then the sending of a response is suspended until the condition of the remaining number being equal to or larger than the predetermined number has been established. The remaining number of PAMBs is incremented every time when recording of a single page has been completed at the receiver.

Telematic reception terminal

In a telematic system, a plurality of response timings for a page boundary command, a page end command and the like from a sending system are prepared. A proper timing is selected in accordance with the type of sending system or an instruction from the sending system.

Telematic system and method of controlling the same

A linear photosensor array is inclined relative to a direction of reciprocating movement thereof. Photosensor elements (4) of the array are self-scanned in one direction while the array is moved in a forward direction and in the opposite direction while the array is moved in a reverse direction after indexing movement perpendicular to the direction of reciprocation.

Self-scanning photodiode array

In a facsimile apparatus, a recording head and a reading head are mounted on a carriage and the carriage is reciprocated in the main scanning direction so that recording and reading of image information are performed and furthermore, a detector is mounted on the carriage for tracing and detecting slits formed in a scale plate, which is fixed to the facsimile apparatus along the movable path of the carriage, whereby the position of the carriage is determined and the moving speed and reciprocating movement of the carriage are controlled.

Facsimile apparatus

A charge accumulation type photosensor array (21) is reciprocated perpendicular to the direction of a row of photosensor elements of the array (21) to scan an original document (22). A timing pulse generator (48) produces timing pulses (E) corresponding to incremental movements of the array (21). All of the photosensor elements produce data signals (Vid) at outputs thereof in series in response to each timing pulse (E). An enable signal (L) is produced when the array (21) is moving in an effective scan area in which the array (21) is moving at constant speed and the periods of the timing pulses (E) are constant. Binary data signals (D) are stored in a memory (44) only while the enable signal (L) is being produced. The charge accumulation times of the photosensor elements in the effective scan area are constant, and especially the charge accumulation time in the first increment of movement in the effective scan area is the same as in the succeeding increments.

Growing community of inventors

Ebina, Japan

Fumihiro Ogasawara