Telephone line failure check method

Telephone is a necessary communication tool in our daily life and work. In the course of use, we often encounter problems with telephone line failures. What are the steps for troubleshooting the telephone line?

First, check if the phone's own line connection is correct.

Step 2: If the telephone line is connected properly, replace it with a new one, and if there is no signal, proceed to the next step.

Step 3: Test the phone port of the failed phone using the phone tester.

Step 4: If there is a signal in the third step test, it means that the telephone line is faulty. Replace the telephone port to the telephone line of the telephone. If there is still no signal, proceed to the next step.

Step 5: Unpack the phone panel and test each of the 4 sets of telephone lines (currently the hotel phone module uses the signals of group B blue and blue and white). If the B group has blue and blue and white telephone lines, there is a signal. It means that the cable on the telephone module is not connected and needs to be re-crimped or the telephone module is damaged. It is necessary to replace the new module. If there are no signals on the four sets of telephone lines indicating that the telephone line of the telephone module to the switch room is faulty, the following operations are required:

Under normal circumstances, there should be a description of which telephone module corresponds to each port of the well telephone distribution frame in the weak electric well.

1. If there is any of the above instructions (the instructions are correct), proceed as follows:

Use the test telephone to test the signal of the telephone port on the distribution frame corresponding to the telephone module. If there is a signal, it indicates that the telephone line of the weak electric well to the telephone module is faulty. It is necessary to use a multimeter to measure whether the eight lines are short-circuited or disconnected, and if there is a short circuit. In the case of an open circuit, at least two lines that are not short-circuited or disconnected from each other need to be measured. If all of the eight are short-circuited or open, the line-changing process is required.

Short circuit condition test

The multimeter is adjusted in the ohm position, one test lead (red) is connected to one of the lines, the other test lead (black) is used to measure the resistance between the remaining seven and the line, and then the red test lead is connected to the other of the seven lines. One line, the black test lead sequentially measures the resistance of this line and the other seven lines, and so on, until the resistance between all eight lines is measured, and which resistance is zero indicates the two lines There is a short circuit between them, and the resistance is infinite and normal.

Use the above method to find 2 normal telephone lines to connect to the normal phone failure to repair.

2. Open circuit test

First, screw the eight telephone lines on the faulty module end together.

Then measure the resistance between the two pairs. If the resistance between the two lines is 0, there is no short circuit. If the resistance between one line and other lines is not 0, the line is broken. Find two faulty lines that are not open and shorted to fix the phone fault.

If the test telephone is used to test the signal of the telephone port on the distribution frame corresponding to the telephone module, if there is no signal, the line fault of the telephone line on the weak power distribution frame to the PABX equipment distribution frame is the same as above.

Second, if there is no port description, you need to use the line finder to find out which port on the patch panel the weak line corresponds to the telephone line on the telephone module.

Method of operation: The transmitter of the line finder is connected to the faulty telephone jack, and then the receiver touches each line one by one on the weak power distribution frame, if the receiver emits a crisp humming sound and the closer it is to the line The louder the hum is, the more the line is the line to the faulty telephone module.

In this way, if there is no port comparison description, after using the line finder to find the fault line, you can continue the previously explained operation, gradually eliminate, find the fault point, and then the processing is completed, so that the fault handling of a telephone is completed.