JPS6187469A - Telematique equipment - Google Patents

Abstract

PURPOSE:To reduce the communication time and to improve the reliability of communication by applying response to communication with a specific transmission terminal equipment in the slowest timing and to that with not a specific transmission terminal equipment in the fastest timing. CONSTITUTION:A picture data from a read section VPU enters a line memory LM and coded and stored in a buffermemory BM. The data in the buffer memory BM is transmitted to a communication control section CCU and stored in a buffer memory FB. Thus, the communication control section CCU gives the coded data in the memory FB to a document layer and transmitted to a line with header processing. Plural return timings of response are prepared by the reception side and a specific party is set. When a specific party is recognized from a parameter in the control procedure, the system responds in the slowest timing and when not the specific party, the system responds in the fastest timing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a telematics device that controls the procedure of a telematics terminal (G4.Teletex), which has been studied by CCITT and others in recent years.

■Conventional technology In telematics services, conventional Gl, G2. G3
The facsimile (hereinafter abbreviated as FAX) has reached its limit. For this reason, in recent years, CCITT and other organizations have been conducting research on telematics service (Teletex, G4FAX, mixed mode machine) terminals, etc., which enable high image quality and high-speed transmission, as well as communication between different models. Proposals for control procedures (protocols) that will enable this are being studied and decided upon.

■Purpose The present invention has been made in view of the above points, and is capable of reliably receiving received data from specific transmitting terminals and stations, and
The purpose is to eliminate errors in procedural control and to shorten communication time.

■Structure In a telematics terminal etc. that has a plurality of page reception response timings, the present invention provides that in response to a page boundary command from a specific transmitting terminal or station, the most When communicating with unspecified transmitting terminals or stations using slow timing,
The present invention is designed to improve the procedure in a telematics terminal as a configuration that responds using the earliest response timing among the response timings, and the present invention will be explained below using G4 FAX.

FIG. 1 is a block diagram showing the configuration of a control circuit for explaining the control procedure in the case of FAX as an example in the present invention.

Generally, when attempting to improve the efficiency of line usage in communications, buffering using memory or the like is performed on the input/output device and the system for sending data to and receiving data from the line.

For FAX, line memory LM, buffer 7 memory B
M, flow buffer memory FB, etc. are required.

Figure 1 shows the system control unit SCU (System Control Unit).
The communication control unit CCU (Go
Illumination Control Uni
t), reading unit VPU (Video Process
Unit), recording unit CU (Write Control
ole Unit), operator interface section OP
It controls U.

Additionally, within the system control unit SCU, there is a COG that generates encoded data by suppressing redundancy from the image information from the reading unit vPU, and conversely, a COG that generates encoded data by decoding the encoded received data and generating the original image information. I have a decoder to play it.

Hereinafter, the CORG and decoder will be collectively referred to as C0DEC.

The communication control unit CCU executes a control procedure for communicating with a partner device through a line in response to a command from the system control unit SCU. The ISO 64 procedure is a hierarchical procedure based on the O5I model.

FIG. 2 shows G4 in the telematics device of the present invention.
This is an explanatory diagram of one embodiment showing a control procedure when using a FAX, and this "takes as an example a control procedure for two pages of image information by continuous transmission. The flow of the control procedure will be explained below.

(i) Call connection setting A procedure for establishing a call with a partner station is generally performed using a network provided by a carrier (in Japan, the National Telegraph and Telephone Public Corporation: NTT). This is the network used (PSTN, PSDN, C3DN, l5
Determined by DN(INS)).

(…) Data link layer settings The data link layer is HD as recommended by CCITT.
LC()Ihigh 1level Data Link
Control procedures). SABM (Set ABM mode) and υA
(On numbered Accept) to establish a data link layer connection.

(in) Transport layer setting The transport layer is TCR (Transport
Connection Request) and TCA (
Transport ConnectionAccep
t) to establish a connection. Also, the data block size of each device is negotiated here, and the number of octets (number of bytes) of the data block to be used during communication is determined.

(tv) Session layer settings C3S (CC55 (Co 5ession 5tart)
) and R55p (Resp.

nse 5ession 5tart Po5itiv
e) establish a connection. Also, here, the I
D, abbreviations, etc. are exchanged, and νind 5ize is negotiated.

(v) Document settings CDCL (Command Document Cap
ability Li5t).

RDCLP (Response Document C)
ability),
CDS (Cofflmand Document 5t
art) to establish the document layer connection. CDCL and RDCLP notify each other of the capabilities of each other's devices, and mode setting is performed using CDS.

(vi) Image information transfer Here, since the connection with the other party has been set up in (i) to (V), the image information data is transferred using the CDUI (Command Do
cul! 1ent User Information
) is appended with an 8-digit bit and passed to the lower layer and sent to the line as image information.

(Header processing is executed in each layer even in lower layers.) Transmission: Image data from the reading section is sent to the line memory LM.
is input into the buffer memory BM and encoded by C0DEC.
is stored in The data in the buffer memory BM is sent to the communication control unit CCU and stored in the flow buffer memory FB. As a result, the communication control unit CCU passes the encoded data that has entered the flow buffer memory FB to the document layer, processes the header, and sends it out to the line.

During transmission, line memory LM and buffer memory BM buffer the read speed and CODEC speed, and buffer memory BM and flow buffer memory FB buffer the GODEC speed and line speed.

The data input from the second reception line is removed from each layer in the communication control unit CCU and stored in the blow buffer memory FB as encoded data. The encoded data in the flow buffer memory FB is stored in the buffer memory BM.
The data is transferred to the line memory LM, decoded by the GODEC, and transferred to the line memory LM. The information is then recorded and reproduced by the recording unit VCU.

During reception, the blow buffer memory FB and buffer memory BM perform buffering between the line speed and the GODEC speed, and the line memory LM and buffer memory BM perform buffering between the recording speed and the GODEC speed.

(Regrettably) At the page boundary and end of document (vi), when the transmission of the first page is completed, if there is still another document to be sent, use the command CDPB (Co+amand
Docu+5ent Page Boundary)
The end of the page is notified to the receiving side. If the current page is the last page, use the command CDE (Comma
ndDocu+5ent End) notifies the end of the document.

On the other hand, the receiving side sends a response RDPBP (Response Document) to the command CDPB.
ent PageBoundary Po5itive
), and the response RDEP (
Response Document End Po5
tive). In addition, a page number parameter is attached to these commands/responses (hereinafter abbreviated as C/R), which allows page management and communication management using Wind 5ize negotiated in session connection. .

The above response is a positive response, and if the page could not be received correctly, a negative response RDPBN (Response) will be sent.
ponse Document Paga Bound
ary Negative). Command CDE
, the response RDEP terminates the document layer connection.

(4) Session End C3E (Go＋＊＋＊and 5session End
) and R3EP (ResponseSession
The session connection is terminated using EndPo5itive). The end of the transport layer is simultaneous with the end of the session layer.

(jx) Link layer termination DISC (Disconnect) and DA (Unnu
The link layer connection is released by (Accept).

(X) Call disconnection setting - Release the call on the held line upon completion of communication. Similar to (i), this procedure is defined depending on the network used.

As explained in (vli) above, at the page boundary (including the document end), the sending side sends the command CDPB to the receiving side and waits for the response RDPBP. At this time, Wind5ize is negotiated with 2 or more, and the number of unconfirmed pages that have already been sent is
If it is smaller than e, transmission of the next page is started.

Here, the timing of returning a response to the command CDPB/CDH will be described.

The faster the response to CDPB/CDH, the shorter the line's invalid hold time. In other words, in order to speed up the communication time, the faster the response to the command, the better.

However, in the case of FAX, etc., since the output is by hard copy, the timing to send back the response is preferably when the recording is normally ejected, but as shown in Figure 1, the line memory LM, buffer memory BM , command CD by buffering such as flow buffer memory FB.
When the PB/CDE is received, there is still a considerable amount of data that has not been decoded and recorded yet. Furthermore, since recording paper ejection is mechanically controlled, it takes a considerable amount of time.

Therefore, in order to reduce these invalid times, Wind
A countermeasure can be taken by setting 5ize>1 and setting the return timing to the time when commands CDPB and CDE are received.

Wind 5ize > 1 is effective during transportation, but not when transported singly. Therefore, the command CDPB/CD
Returning a response upon receiving an E is most effective in reducing communication time.

When a response is returned upon receiving a command, as described above, the flow buffer memory FB, buffer memory BM, and line memory LM contain data that has not yet been reproduced.

Therefore, after returning an affirmative response (RDPBP/RDEP), it is further decoded, and recording/reproduction and recording paper ejection are executed.

Therefore, there are risks such as occurrence of decoding errors, overheating of the recording head, and jamming of recording paper.

Decoding errors are covered by an error-free function based on the HDLC procedure, and recording paper jams are also well suited for commercial use due to the simple design of the mechanical system, and their occurrence frequency is small, making them no longer a problem.

Therefore, in the present invention, for example, two response return timings are provided: (a) when a command is received, and (b) when recording paper is ejected, and normally (a) is used to respond to a specific party. (b) should be used.

The specific partner is FIC3 (which has been announced by NTT in recent years).
Facsimile Intelligent Comm
communication system) and a settable partner (for example, a center device). That is, information can be sent to a party with absolute reliability, and a reliable response can be used between necessary devices.

The FIC3 is a device by which NTT provides various facsimile communication services to FICS network subscribers as part of the network. For example, when a subscriber notifies the FIC3 of a broadcast, the FIC5 calls the other party to broadcast the broadcast.
3, the data from the party who notified the broadcast request is transmitted. In this service, when the data has been sent to the device composed of the FIC 3, the subscriber receives an affirmative response, indicating that the data has been correctly transmitted to the other party, and notifies the subscriber that the data has been successfully transmitted.

Here, if a response is returned at the timing (a) above, when a recording paper jam or the like occurs, the subscriber will be notified that the reception is normal even though reception has not been completed correctly. Therefore, in order to eliminate such problems, a specific partner is set in advance, the specific partner is recognized from the parameters in the control procedure, and the timing of the above response is automatically set to the most reliable (b). Select and send back.

For responses that can recognize the other party, C3S
, ID, abbreviation, etc. in R55P can be used.

The above has been explained using a facsimile, but in ETEX, etc., the main communication is memory memory, but due to the necessity of transferring to a floppy disk, etc., the above explanation holds true to a large extent, and it can also be used in the same way. It is possible.

■Effects As explained above, the present invention prepares multiple response return timings on the receiver side, shortens the communication by using the timing that would normally speed up the communication time, and sends a response to a specific transmitter or station. .

By responding to page boundary commands (including document ends) using reliable return timing, communication time can usually be reduced, and it is possible to However, there is an advantage that more reliable communication can be performed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a control circuit for explaining the control procedure in the case of using FAX as an example in the present invention, and FIG. It is an explanatory diagram of one example showing a control procedure. LM...line memory, BM...buffer memory,
FB...flow buffer memory, CCU...communication control unit, SCU...system control unit, OPU...
Operator interface section, vPU...reading section, WCU...recording section, CDPB, CDE...command, RDPBP, RDEP...response. Patent applicant: Ricoh Nippon Telegraph and Telephone Public Corporation

Claims (1)

[Claims] In telematics terminals etc. that have multiple page reception response timings, in response to a page boundary command from a specific sending terminal or station, etc., the latest reception response timing among the held reception response timings is used. A telematics device characterized in that when communicating with a partner such as a transmitting terminal or a station, it responds using the earliest response timing.