JPS61109366A - Additional device for connecting facsimile network - Google Patents

Abstract

PURPOSE:To detect the closing of the direct current loop by the incoming response of a FAX equipment without fail while a call signal with no relation to the line by connecting the FAX equipment to an electric power source supply means by a change-over means during the period of the sending interrupt of a call signal. CONSTITUTION:To a main pole of contacts rl2<1> and rl2<2>, call signal, an output of a generating device 3, is given, and to a make pole of contacts rl4<1> and rl4<2> used as a change-over means, an electric power source part 4 to supply an electric power source which detects the opening and closing condition of the direct current loop by the FAX equipment 2, is connected. Between the main pole of the contact rl4<2> and a terminal ADP-L2, the opening and closing condition of the direct current loop by the equipment 2 is detected, and an electric current detecting circuit 5 to detect an inversion of the loop electric current based upon a line voltage inversion of the line is serially inserted. Thus, during the period of the sending interrupt of a call signal, the equipment 2 is connected to the part 4 by the means rl4<1>, and the loop detecting means detects a response of the equipment 2 in accordance with the distribution of the loop electric current based upon the electric power source of the part 4.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a method for connecting a FAX device that does not have a connection function to a facsimile (hereinafter referred to as FAX) communication network (hereinafter referred to as network) to a FAX network. This relates to an additional device inserted between the FAX network and a communication line (hereinafter referred to as line) from the FAX network.

[Conventional technology]

FAX machines are generally equipped with a telephone, and in order to prevent the telephone from ringing when a call is received, a 1.3 KH2 silent ring signal (hereinafter referred to as "no-ring signal") will be received when the telephone receives a call from the FAX network. However, it is impossible to detect a no-ring signal with a fax machine that does not have a connection function with a fax network, so there is an additional function that detects a no-ring signal and sends a general 16H2 calling signal to the fax machine. FAX equipment that does not have the function of connecting to a FAX network can be used to fax
It is proposed to connect to the network.

[Problem that the invention seeks to solve]

However, when a 16H-2 paging signal is sent to the FAX machine in response to the detection of a no-ring signal, the line must be disconnected to send the paging signal, and the FAX machine responds and closes the DC loop. Even if this is done, a problem arises in that the loop current from the power supply from the line does not flow, making it impossible to detect the response of the FAX machine.

[Means for solving problems]

In order to solve the above-mentioned problem, the present invention is constructed by the following means.

That is, in the above-mentioned additional device for connecting to a FAX network, F
It is equipped with a power supply means for supplying power for detecting the state of the DC loop by the AX device, and a loop detection means for detecting the connection of the power supply means to the FAX device only during the period when the transmission of the calling signal is interrupted. be.

[For production]

Therefore, the calling signal is generally a continuous transmission of t'sec,
2SeC is repeatedly sent due to the interruption of sending, but during the period of interruption of sending, the FAX is sent to the power supply means by the switching means.
The device is connected, and during this time, the loop detection means detects the FAX according to the flow of loop current based on the power from the power supply means.
It detects the response of the device.

〔Example〕

Hereinafter, the invention will be described in detail with reference to figures showing implementation [jlJ].

FIG. 1 shows a block diagram including the main parts of the FAX equipment.
2 and a telephone terminal device I to which an attached telephone (not shown in the figure) is connected.
11-4.

Although connected via the rt1o flake pole, it is disconnected according to the operation of the relay I'tL1, and each terminal L1, L
2. Place I.

Position 2 is the line terminal ADP-L1, L2 on the FAX machine 2 side.
, and are extended to circuit terminals ADP-I and ADP-2.

In addition, between each terminal L1, L2 and ADP-L1, L2, MBB type relay contacts rt2, rL2,
and transfer type IJ 17-contact rlA
+r74 is inserted, and an MBB type relay contact rL2. Is the break pole of rL2 inserted? is included.

In addition, contact r12. A ringing signal generator (hereinafter referred to as RING) 3 that generates a 16Hz ringing signal is installed at the main pole of rL2.
1g point rt4 where the output of is tilted and used as a switching means
A power supply unit (hereinafter referred to as PS) 4 that supplies power for detecting the closing/opening status of the DC loop by the FAX device 2 is connected to the make terminal of 2 "", and the main terminal of contact rL4" is connected. Between the pole and terminal ADP-L2, there is a
Detection of DC loop closure or openness by device 2
~, and a current detection circuit (hereinafter referred to as IDET) that prevents the polarity reversal of the loop current based on the line voltage polarity reversal
)5 are inserted in series.

On the other hand, contact rL2. On the line side of rt2, in order to perform the primary response independently in the additional device 1, there is a resistor R that closes the DC loop and a make type relay contact r1.
3 are bridge-connected, and the capacitors CI and C2 for blocking direct current and the line transformer LTA are connected.
A signal detection circuit (hereinafter referred to as 5DET) 6 for detecting a non-ringing signal of, for example, 1.3KH7 is connected via a bridge.

The detection power of IDET・5 and 5DET・6 is given to the control unit (hereinafter referred to as CNTA) 7, and the C
NTA・7 drives relays RL1 to RL4 and RIN
The CNTA-7 controls the G-3 and 5DET-6, and the CNTA-7 is composed of a processor such as a microprocessor and a memory, etc. The processor executes instructions in the memory, and the necessary data is transferred to the memory. Control operations are performed while accessing.

Regarding the above, the FAX device 2 has each terminal ADP-L1.
L2 and ADP-meter, corresponding to TEII, 2 line terminal FX-Ll, L2 and telephone terminal FX-meter,
line terminal FX-L1. L2 is controlled via a response detection circuit (hereinafter referred to as ASD) 21 that detects the off-hook of the telephone and the opening of a DC loop due to its own response, MBB type relay contacts r/Q, rto, and line transformer LTF. Department (hereinafter referred to as CNTF)
22 and is connected to the telephone terminal FX-meter.
, place 2, contacts rtfJ, are connected to the line terminals F'X-Ll, L2 via the break pole of rtO and ASD-21, and are connected to the telephone terminal FX-meter.

For position 2, a DC blocking capacitor C11°C1
2 and 16I (calling signal output circuit F8C and below for detecting the calling signal of z, RDET) 23 are bridge-connected.

Therefore, in the standby state, the contacts rt in the FAX machine 2
O, rto k, the telephone circuit of RDET-239111 connects each terminal FX-meter, position 2, ADP-meter, TER
, 2 and total 2 are extended to the attached telephone, and if relay RL1 of additional device 1 is operating, the telephone can freely make and receive calls to the line, and off-hook and dial calls can be made. Moreover, when the communication switch (not shown in the figure) of the FAX device W2 is operated, the CNTF 22 drives the relay RLO according to the logical product of the detection force of the ASD 21 and the output of the communication switch, so the telephone disconnects from the line. At the same time as the line is disconnected, the line is connected to the line transformer LT, and FAX transmission is performed.

1. When receiving a call, in response to the detection of the calling signal by the RDET-23, the CNTp.22 drives the relay RLO to close the DC loop, and enters the receiving state with automatic response.

FIG. 2 is a timing chart showing the waveforms of each part in FIG. 1 when a no-ring signal is received.
Since TA.1 sends out a drive signal (old) and puts relay RL1 into operation, the line is disconnected from the telephone and extended to the FAX device (+, '211j:).

Next, when the no-sound signal (02) arrives for a fixed time Tsc of G tosec from time t1, it is detected by 5T)ET6 and the detection force Ds is sent out, but CNTA 7 monitors the continuous arrival time of the no-sound signal (02) according to the continuous time of the detection power DS,
Find the detection power of (03).

That is, from the arrival of the no-ring signal (02), for example, o,
When the initial detection time 'f'p k of 5 sec has elapsed, the initial detection force Dp is generated, and after this, the no-sound signal (02) is generated.
For example, the normal detection time T is 2.2 seconds from the arrival of
When Nk elapses, the normal detected force DN is generated, and if the detected force Ds disappears after the detected force DF is generated, the detected force DN is not generated.

CNTA・7 outputs a control signal (04) according to the detection force DF.
is sent out, operates relay RL2, and connects circuit terminal ADP?
) -71, contact rt2. inserted between position 2 and telephone terminal meter, position 2. Flake Th'5 of rt'l is turned off, the line side is completely disconnected by contacts rt2' and r12', and RJNG-3 is connected to the FAX machine 2 side, and at the same time, the control signal is activated according to the intermittent cycle of the ringing signal. cR is sent intermittently, and a calling signal (0
5) is sent to the FAX machine 2.

The calling signal (05) is generally sent out during the sending period TM of tsec and the sending cutoff period Ts of 268c, and as the normal detection power DN occurs, this changes from TMI to TMII,
As TSI~T'ss is continuously repeated, CN
TA・7 sends control signal (06) New term 11J3Tsl
-Tss and operates relay RLJ. During this period, PS-4 is connected to the FAX device 2 side via IDET-5 by contacts r1.4" and rL4', and the FAX Device 2 is out of transmission period'
If you respond immediately after rss and drive relay RLO by sending control signal (07) to close the DC loop, PS
・A loop current is passed from 4, which is detected by IDET 5 as an incoming call response, and generates a detection force (θB). Accordingly, CNTA 1 sends control signals (04), (
06) is stopped and the line is connected to the FAX machine 2.

Furthermore, since the occurrence of the normal detection power DN, CNTA-T has
Prohibit signal C to 5DET-6 until communication ends.
Send I1. L Prevent false detection.

Therefore, the fax cannot be sent after the no-ring signal (02) arrives.
The response time TA until the device 2 responds is TA:Tp+
TMl+Ts1+TM2+Tsz+TMa+TS11=
0.5+1.0+2.0+1.0+2.0+1.0+2
．． ．． 0=9.5 (see) ・・・ ・・・ ・・
・ ・ ・ ・ ・ (1) and no ringing signal (0
If the constant time T'sc in 2) is 10 seconds, -FAX
Even if the network detects a response only during a certain period of time TBc, the response can be sufficiently detected.
The F)-X device 2 can freely communicate with incoming calls from the FAX network.

However, if the FAX machine 2 does not respond within a certain period of time Tsc, the CNTA 7 detects this with a timer, sends the control signal (09) only for a certain period of time TI'A of, for example, 38 eC, and then sends the control signal (09) only for a certain period of time TI'A, Drive RL3 to connect resistor R
closes the DC loop, performs a primary response, and sends a blinking signal (10) to the indicator light PL.
This blinks to notify you of an incoming call, and during this time the fax is sent.
If the secondary response by the device 2 is not detected by the IDET 51, the intermittent signal (11) is set to Lo for the buzzer BZ.
Only the TAL is sent out during periods such as se(!), and an alarm is issued by the intermittent sounding of the buzzer BZ.

Note that the blinking signal (10) becomes a continuous lighting state after the period TPA has elapsed, and if there is no secondary response, the transmission is stopped in response to the detection of the next non-ringing signal.

FIG. 3 is a timing chart similar to FIG. 2 showing the time of transmission to the FAX network, and in response to the main power of the additional device 1 being turned on at time to, the control signal (21) is
is sent, relay RL1 operates at L, and the line is extended to FAX machine 2. At time t, 11, the telephone is off-hook (23), and then the calling procedure is performed by dialing, and at time t14. In (2
After the fax network responds as described in 5), when the communication switch is operated at time till, the control signal (24) is sent and the relay RLO is activated, so if on-hook is performed at time t14 after this, the fax transmission is stopped. state.

However, in the FAX network, if the polarity of the line voltage is reversed at time t1s for the purpose of commanding the stop of transmission, IDET-5 will respond to the detection power (26
), and in accordance with this, CNTA 7 stops sending out the control signal (21), so that relay RT, 1 is restored and the line is disconnected from FAX machine 2.

According to the off-hook (23) and operation of the relay RLO by the control signal (24), the DC loop is closed.
DET・5 detects and generates a detection force (22),
In accordance with this, CNTAφ7 sends a prohibition signal C to 5DET-6 in the same manner as described above, and prohibits erroneous detection of each scale command signal and image signal containing frequency components near the frequency of the no-sound signal. It has become.

Note that the FAX machine 2, which does not have a polarity reversal detection function, maintains the transmission state even if the line is disconnected due to the restoration of 11th relay [, 1], and transmits in response to the failure of a response signal from the other party. The DC loop is closed until the condition is released and relay RLO is restored.

Therefore, in response to the occurrence of the detection force (26), CNTA-7 restores relay RL1, operates relays 1l-RL4, and uses the loop current from PS-4 to
Monitor the current loop status on the AX device 2 side and open the IDE
When detected by T.5, relays RL1 and RL4
will be restored.

FIG. 4 is a timing chart similar to FIG. 1 showing the incoming call when a general telephone line is connected as the line. The operation is the same as described above, but when the paging signal at 16)Tz arrives from time t21, it is detected by the RDET 23 of the FAX machine 2, and in response, the control signal (33) is sent to the CNTFII 22.
Therefore, relay RLO operates to close the DC loop.

Therefore, the loop current from the telephone recall is IDET 5
is detected and generates a detection force (32), and in response to this, the CNTA 7 sends out an inhibition signal itself and prohibits the detection operation of the 5DET 6.

FIG. 5 is a timing chart at the time of transmission similar to that in FIG. Phone off-hook at t81 (4
3), and relay RLO by sending the control signal (44) in response to the operation of the communication switch at time t811.
According to the operation of IDET.5, a detection force (42) is generated, and in response to this, a prohibition signal C! is sent.

FIG. 6 is a flowchart of the control situation by the processor in CNTA-T corresponding to the operation in FIG. Signal (hereinafter referred to as NRG)'NRG@0.5. Continuous detection of eo?
If ``102'' becomes Y (YES), the RL2 operation is set to 111 by sending the control signal (04), and the 16Hz ringing signal (hereinafter referred to as RG) is activated by the control signal CRK.
After performing G・t see transmission “112,” the control signal (
06) and set it to ``RL4 operation'' 113, and the IDE
1 DC loop closure by T.5? “114 is checked and the timer in the processor says “2fseC elapsed?” 〃
The judgment in step 115 is made, and in response to this being Y for the time amplifier, 'NRG.2.
2BeC continuous detection? 116, and according to Y of this, the control signal (06) is stopped and the RL4 restoration #1 restoration is completed.
ec sending〃121, 'RI, perform 4 operations ``122'' and close 1 DC loop as in steps 114 and 115?
“123, ' 2See progress? If 124 is judged and step 123 is N and step 124 is Y,
Same as step 117 <'RL4 recovery/' After performing 1251, by counting the counter configured in the processor' Send RG 3 times? ”126 is N (NO)
During this period, steps 121 and subsequent steps are repeated, and step 126
becomes Y, 1 due to the operation of relay RL3.
The process moves to 11th response processing 1127.

Further, if step 116 is N, it is assumed to be an erroneous detection and the process moves to "1 error processing" 131, and step 114 or 12
If 3 becomes Y, the process moves to 1 communication process "132" and sets a state in which communication of the FAX device 2 is permitted.

Therefore, as shown in FIG. 2, PS-4 is connected to the FAX machine 2 only during the transmission interruption period TslC of RG (05), and IDET
・Detection of the response of the FAX device 2 by the method 5 is performed.

In addition, since power is not superimposed on RG, RI
As the degree of freedom in designing NG・3 and ps・4 increases,
There is no need for a superimposing transformer, etc., and the structure is simplified, making it easier to reduce size, weight, and cost.

Alternatively, the RG connection may be made independently in RING 3, or the judgments in steps 102 and 116 may be made in 5DET 6. without shape, with transfer shape, or rt2.r
The same effect can be achieved even if a break type is used for t2, and a switching element such as a semiconductor switch may be used for these.

In addition to using a processor, CNTA・T
You may also use a dedicated one configured by combining various logic circuits. The detection time Tp and the normal detection time TN may be determined in various ways depending on the situation.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to reliably detect the closure of a DC loop due to an incoming call response from a FAX machine during the sending of a call signal, completely unrelated to the line, and the control situation becomes accurate. A remarkable effect can be obtained as an additional device for connecting to a FAX network.

[Brief explanation of drawings]

The figures show embodiments of the present invention, with Figure 1 being a block diagram and Figure 2 being a block diagram.
5 to 5 are timing charts showing the waveforms at the troughs in FIG. 1, and FIG. 6 is a flowchart of the control situation. 1...Additional device, 2Φ...FAX device, 3...
・RING (calling signal generator), 4...φφPS (power supply section), 5...IDET (current detection circuit), 6...
...5DET (signal detection circuit), 7.Fist... (JTT
, A (control unit), I, 1. I, 2...Line terminal,
Total, set 2--telephone terminal, ADP-Ll, L2
...Line terminal, ADP-meter, Place 2...Circuit terminal, RL1~RL4...Relay, rtl''~r
z1', rt2"~rz2', rt3", rt4",
rL4”...Contact.

Claims (1)

[Claims] A facsimile machine that is inserted into the communication line side of a facsimile machine, detects a silent ringing signal that continuously arrives from the facsimile communication network for a certain period of time, and sends a ringing signal having a predetermined intermittent cycle to the facsimile machine in response to the detection. An additional device for connecting to a communication network includes a power supply means for supplying power for detecting a state of a DC loop by the facsimile machine, and a power supply means for connecting the power supply means to the facsimile machine only during a period when transmission of the calling signal is interrupted. An additional device for connecting to a facsimile communication network, comprising a switching means and a loop detecting means for detecting the closure of the DC loop by the power source as an incoming call response of the facsimile machine.