JPS5938785B2 - Automatic telephone test method for road emergency telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION As expressway construction progresses around the world, the demand for road telephone devices for emergency communication is rapidly increasing.

Road telephone equipment generally consists of a solid equipment and a roadside telephone set, and has a relatively long-distance line configuration, so for economical reasons, the telephone lines connecting these are often of the branch type.

The present invention provides a reasonable test method that can send test signals from the central switching equipment to the valued telephones to check their operational status in order to confirm that the functions are normal in branch telephone systems over long distances. This is what we provide.

The gist of the present invention is to transmit voice band test selection signals from a central switching equipment side to individual telephones over a telephone line in which telephones scattered over long distances are connected in a branch manner.
The power-on relay of the selected telephone is ready for operation, and then the DC voltage application polarity of the connected telephone line is reversed to activate the relay and power on the selected telephone, and the call extension is activated. Activate the circuit to form a circuit that enables communication with the switching equipment side.

At the same time, the switch circuit is activated by the polarity reversal operation, and the address signal of each telephone is automatically transmitted from the selected telephone, thereby confirming that the selected telephone has been selected without fail on the switching equipment side. After the confirmation operation, the exchange equipment side sends a voice band test pilot signal to the selected telephone, and the voice output drives the receiver unit of the selected telephone to generate a ringing sound. This ringing sound is picked up by the transmitting unit of the selected telephone and sent as an electrical signal to the switching equipment side.The switching equipment compares it with the test signal sent earlier and there is no abnormality in the operation of the above circuit system. This is a series of automatic telephone test methods that automatically test branch telephones in sequence. The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a circuit configuration diagram as an embodiment of the present invention.
3 in Figure 1, namely the branch type telephone selection signal oscillator (
Hereinafter, it will be referred to as a selection signal oscillator.

) for branch type telephones (hereinafter referred to as
It's called a telephone. ) is transmitted, the signal is amplified by the transmission amplifier 4 in the switching device 1, and sent from the switching device 1 side to the transmission path toward the telephone, that is, the telephone line L1, to select the telephone. Reference numeral 2 in FIG. 1 is a typical system diagram of a selected circuit in a telephone set, and the selection signal from the switching device 1 is transmitted from the telephone line L to the signal amplifier AMl via the input transformer T3. The selection signal amplified to a specified amplitude level is sent to the next stage signal filter switch FS, and only the filter switch circuit of the telephone corresponding to the incoming signal is selected from the telephone and turned on. At the same time as the sending of the selection signal is completed, the switching device side reverses the direction of power supply being supplied through the telephone lines Ll and L2. In other words, in a steady state, the power source EV (17
)1-Middle point of switch S transformer T2 -Telephone line L2-
Midpoint of transformer T4 - Relay wire RY - Signal filter switch FS - Diode Z - Midpoint of transformer T3 - Telephone line L1 - Midpoint of transformer T1 - Switch S - Power supply EV
(7) Although the circuit e is formed, the diode Z in the figure
Since the direction of is reversed, current will not flow and relay RY will not start. However, as described above, if you send the selection signal to turn on the signal filter switch FS, and then immediately start the switch S and reverse the direction of the DC supply current, the switch S will switch to the dotted line side in Figure 1 and the power source EV (7) 1-Switch S-Transformer T1-Telephone line L1-Transformer T3-Diode Z-Signal filter switch FS-Relay RY-Transformer T4-Telephone line L2-Transformer T2-Switch S
- The circuit is configured in the order of power supply EVO)e, and the relay RY in the telephone 2 is activated and its contacts Ry, , ry2 are closed.
Only when the contact Ryl closes does the power supply EV begin to be supplied to the receiving amplifier AM2 and the transmitting amplifier AM3 in the telephone 2, and their operation begins. Next, the relay contact Ry2 supplies power E through the capacitor C to the circuit of the individual signal oscillator MF-0SC in the telephone 2, oscillates the individual signal oscillator MF-0SC only for a time according to the capacity of the capacitor C, and sends the signal as a signal. The signal is amplified by amplifier AM4 and sent to telephone line L3 via transformer T5. The sent signal passes through a signal amplifier 8 in the switching device 1, and can be checked against the signal previously sent from the selection signal oscillator 3 in the signal verification circuit 5. After this check is completed and it is confirmed that the selected telephone is correct, a pilot signal for testing the voice band of the switching device 1 is subsequently transmitted from the test pilot signal oscillator TO. This signal is amplified by the signal amplifier 4 and sent to the telephone line L1. The signal from the test pilot signal oscillator TO, which is sent out in place of the selection signal from the selection signal oscillator 3, reaches the telephone set 2 and is input to the receiving amplifier AM2 via the transformer T3. On the other hand, relay R is already
Since Y is activated and contact Ryl is closed, the receiving amplifier AM
2 is in operation, the signal is amplified and makes the speaker SP, which is a receiving unit, ring. Therefore, a part of the acoustic energy emitted from the speaker SP is picked up by the microphone MIC, which is a transmitting unit for telephone calls, becomes an electrical signal, is guided to the transmitting amplifier AM3, is amplified, and is sent to the telephone line L2 via the transformer T4. Ru. This signal reaches the switching device 1 and is guided to the audio level matching circuit 6 via the receiving amplifier 7 in the switching device. At this point, a level check and waveform comparison are performed with the test pilot signal that was previously sent to the telephone set, thereby making it possible to check whether the above-mentioned circuit functions built into the telephone set 2 are normal or not. ing.
As mentioned above, we have explained the functions of one telephone and the switching equipment side, but if you set the selection signal transmission frequency of each telephone one by one and perform the test, the switching equipment side can perform a selection test and a call test for each telephone. This can be done remotely and achieve the desired goal.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram as an embodiment of the present invention. 1...Switching device, 2...Telephone, 3.
... Selection signal oscillator, 4 ... Transmitting amplifier in the exchange device, 5 ... Signal matching circuit in the exchange device, 6 ... ... In the exchange device audio level matching circuit,
7... Receiving amplifier in switching equipment, 8...
・Signal amplifiers Tl, T2 in the exchange device...Transformer in the exchange device, TO...Test pilot signal oscillator, EV...Power supply, S... Switch, Ll, L2, L3...Telephone line, AM
l...signal amplifier, AM2...receiving amplifier, AM3...transmitting amplifier, Nton...
・Signal amplifier, MF-0SC...Individual signal oscillator, FS...Signal filter switch, RY...
...Relay Ryl, ry2...Relay contact, Z...Diode, SP...Speaker, MIC...Microphone, C...
・Condenser, T3, T4, T5...Transformer.

Claims (1)

[Claims] 1 Means for selecting one of the branch telephones to be tested using a branch telephone selection signal oscillator in the switching equipment, and at the same time activating a switch to activate the transmitting amplifier and the receiving amplifier in the branch telephone. means for transmitting an individual signal oscillator in the branch telephone, and comparing and confirming the signal with a signal transmitted from the branch telephone selection signal oscillator in the switching device using a signal matching circuit in the switching device; A test pilot signal oscillator in the switching equipment transmits an audio frequency signal, causes a speaker in the branch telephone to ring, and a portion of the acoustic energy is picked up by a microphone in the branch telephone and converted into an electrical signal. , a road emergency telephone, which is introduced into a voice level verification circuit in the switching device and automatically tests the branch type telephone in sequence by verifying the signal against the signal transmitted from the test pilot signal oscillator. Automatic telephone test method for equipment.