JPS59200577A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To speed up message transmission in a facsimile equipment which has a signal control part by switching modems according to the procedure of a signal for the transmission and reception of a control signal. CONSTITUTION:Backward modems 4 and 14 are provided; V27ter/V29 modem 12 is used for the transmission of a procedure signal after picture signal transmission from a transmitter 200 to a receiver 100, and the backward modem 4 is used for the transmission from the receiver 100 to the transmitter 200. Further, V21 modems 3 and 13 are used for a procedure signal before the picture signal transmission, and a mutual communication with facsimile equipments in the CCITT group.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a facsimile machine, and particularly to a backward modem and transmission (modem) control unit, generation of a procedure control signal,
The present invention relates to a facsimile IJ device having a signal control unit that generates and checks an analysis signal frame.

When communicating between facsimile machines, there is a
Some control information is exchanged.

The CCITTT30 procedure is known as a standard facsimile control information exchange procedure. However, its purpose is to transmit messages at high speed, and it can be said that it is a standard to guarantee communication between 7-axis devices connected to the general public telephone network. For example, the control procedure signal is a CCITTV21 300bpS binary signal or a CCITTV27 ter 2400t)p
The use of the S binary signal is completely requested, and the use of the image (I (7) transmission speed V27 ter 2400 + 4800 bps or &! V29 7200.9600 bps f7) is stipulated. In other words, when switching between the control procedure signal and the image signal, the modem is always switched from V21 to V27terIV29.
It will be necessary to switch from V27ter/V29 to V21. Conventional facsimile machines have the disadvantage that when the modem is switched, modem training is required, which slows down message transmission.

An object of the present invention is to eliminate such drawbacks in the conventional apparatus, and also to have a backward modem, and for the procedure signal after sending the image signal, the V27ter is used from the transmitter to the receiver.
/v29 modem is used, a backward modem is used from the receiver to the transmitter, and a V21 modem is used for procedure signals before image signal transmission, allowing mutual communication with CCITT Group 3 facsimile equipment. The purpose is to provide a device with

According to the present invention, in a facsimile apparatus having at least two types of modems, a backward modem capable of transmitting and receiving signals without disconnecting the carrier of the modem, and controlling the two types of modems and the backward modem. It is equipped with a transmission control section and a signal control section that is connected to each of the modems and generates and analyzes procedure control signals, and generates and checks signal frames. A facsimile machine in which the modem can be switched is obtained.

Furthermore, according to the present invention, the transmission control unit uses a V21 modem for the procedure signal before sending out the image signal, and the V27 modem is used for the procedure signal after sending out the image signal from the transmitter to the receiver.
A facsimile device that uses an er/V29 modem and uses a backward modem from the receiver to the transmitter, thereby being able to quickly transmit messages without maintaining interoperability with CCITT Group 3 facsimile devices. is obtained.

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 2, the embodiment of the present invention has an image signal receiving section 1.
, V29/V27ter modem 2, V21 modem 3, V
A backward modem 4 that can transmit data without disconnecting the carrier of the 27 ter/V29 modem, a modem control unit 5 that switches and controls these modems, and a signal that generates and analyzes procedure control signals, and generates and checks signal frames. A receiver 100 comprising a control section 6, an image signal transmitting section 11, a V27ter/V29 modem 12, a V21 modem 13, a backward modem 14 capable of receiving data without disconnecting the carrier of the V27ter/V29 modem, and these modems. The transmitter 200 includes a modem control section 15 that performs switching and control, and a signal control section 16 that generates and analyzes procedure control signals, and generates and checks signal frames.

When the receiver 100 receives a reception request from an operator or the like, the signal control section 6 causes the modem control section 55- to put the V21 modem 3 into a transmission state. Next, T3
NSF signal denoting non-standard equipment specified in the 0 procedure;
A DIS signal, which is a digital identification signal, is sent out by a V21 modem. Here, the facsimile information field PIF of the NSF signal includes information such as an ID indicating that the receiver is a receiver according to an embodiment of the present invention, the capability of the receiving modem, recording density, minimum recording time, and encoding method. . After sending out the NSF signal and the DIS signal, the signal control unit 6 causes the modem control unit 5 to put the V21 modem 3 into a receiving state, and waits for signal input to the V21 modem 3. When the signal is inputted, the signal control unit 6 analyzes the signal and generates a digital enemy command signal DC8 specified in the T30 procedure.
If the signal is a CCITT group 3 signal, the receiver 100
When connected to a facsimile device, message transmission is then started based on the T30 procedure.If the other party's device is a transmitter according to an embodiment of the present invention, an NSS signal, which will be described later, is received as a response signal to the NSF signal.

If an NSS signal is received and an ID indicating that the FiP is a transmitter according to the sixth embodiment of the present invention is found, the same is true (the modem speed specified in the FiF is transmitted to the modem controller 5).
to set the V27 ter/V29 modem 2 to the receiving state.

Next, when the transmitter 200 receives a transmission request from an operator or the like, the signal control section 16 causes the modem control section 15 to put the V21 modem 13 into a receiving state. At this time, if the transmitter 200 does not receive an NSF signal from the other party (or receives an NSF signal DIS signal but cannot find the ID of the receiver according to the embodiment of the present invention in the FiF of the NAF signal) is connected to a CCITT Group 3 facsimile device and starts message transmission according to the T30 procedure.It also receives an NSF signal and sends an ID to its FiF indicating that it is a receiver according to the present invention.
If you find the same (based on the information contained in the FiF, the modem speed to transmit, the line radio wave, the minimum transmission time, the encoding method, and the ID of the transmitter according to the present invention are included in the FiF) Non-standard in T2O Equipment enemy command N8S signal V2
1 is sent from Motem 13. After the signal control unit 16 sends the NSS signal, the modem control unit 15 outputs the V 27 ter/
The V29 modem 12 is put into a transmitting state, and the image signal transmitter 11 sequentially outputs the image signals to the receiver 200 by the V27 ter /V29 modem.

Further, the packed word modem 14 is placed in a receiving state in order to receive a response signal from the receiver 200. Receiver 1
00 is waiting for a signal after receiving the above-mentioned NSS signal. Here, the received data inputted by the V27/V29 modem 2 is checked for frames by the signal control section 6, and if it is normal, it is manually input to the image signal receiving section 1. At the same time, the backward modem 14 returns an ACK signal indicating that the received data has been received normally, and if a frame check error is detected, a NACK signal indicating that the received data is defective.

The transmitter 200 sends a post message specified by 1 page sending out T30, that is, MPS (indicates that there is a next document)
, EOP (indicates the end of a procedure), or EOM (indicates a request for a mode change).
27ter/V29 modem 12. Receiver 1
00 is T2 if - page is normal after receiving a post message
Signal corresponding to MCF signal by O, R if normal
A backward modem 4 is used to respond with a signal corresponding to a TN signal. In the transmitter 200, the signal control unit 16
The received data from the backward modem 14 is monitored without disconnecting the carrier signal of the 27ter/V29 modem 12, and upon reception of the MCF signal, the next document is sent.
Fall pack is performed by receiving the RTN signal. As described above, the receiver 1 according to the present invention receives the NSF and NSS signals.
00, after recognizing that the transmitter 200 is connected and switching the modem to V27ter/V29 modem 2, 12, the procedure control signal from the transmitter 200 to the receiver 100 is V2.
By using a 7ter/V29 modem and using a backward modem for the procedure signal from the receiver 100 to the transmitter 200, communication can be performed without switching modems.

Therefore, it is possible to save modem training time by switching modems, and to perform high-speed procedure control. Further, since the receiver 100 outputs NSF and DIS signals and the transmitter 200 outputs DC8 and N8S signals in the format specified by T2O, mutual communication with Group 3 facsimile devices is possible.

As explained above, the present invention includes a backward modem and a modem control unit that can transmit and receive data without disconnecting the carrier of a V27ter + V29 modem in a facsimile machine, a generation analysis of a procedure control signal, and a generation check of a signal frame. Equipped with a signal control circuit, transmitting and receiving procedure signals after image signal transmission from the transmitter to the receiver is V27T.
By using an ER/V29 modem and a backward modem from the receiver to the transmitter, messages can be transmitted at high speed, and V2 does not require the transmission and reception of procedure signals before sending out image signals.
By using one modem, message transmission with Group 3 facsimile equipment is also possible.

[Brief explanation of the drawing]

Drawing 10-# is a circuit diagram showing an embodiment of the present invention. 1...Buffer memory, 2...V 2
7 ter/V 29 modem, 3...V21 modem, 4...backward modem, 5...
...Modem control section, 6...Signal control section, 7...
... Image signal receiving section, 11 ... Buffer memory, 12 ... Second modem (V27ter/V
29 modem), 13...first modem (V21
modem), 14...Backward modem, 15
. . . Modem control section, 16 . . . Signal control section, 17 . . . Image signal transmission section. 11-

Claims (2)

[Claims] (1) A facsimile device having at least two types of modems, a backward modem capable of transmitting and receiving signals without disconnecting the carrier of the modem, and a transmission control section that controls the two types of modems and the backward modem. , a signal control section connected to each of the modems, which generates a procedure control signal, generates and checks an analysis signal frame; A facsimile device characterized by: (2) The transmission control unit uses the first modem to send and receive control signals, and the first modem to send and receive procedure signals before sending out image signals,
For transmitting and receiving procedure signals after image signal transmission, a second modem is used from the transmitter to the receiver, and a backward modem is used from the receiver to the transmitter to improve mutual communication with the facsimile machine. The facsimile IJ device according to claim 1, wherein the facsimile IJ device is capable of transmitting messages at high speed while maintaining the same speed.