What should I do if the indicator of a phone is off when the phone is picked up

• The phone is faulty.
• The device is faulty.
• The subscriber line is unavailable.
• The power supply is abnormal.

Solution

1. Replace the phone with another one.
   • If the problem does not occur, the original phone is faulty. Replace the original phone.
   • If the problem persists, go to Step 2.

2. Connect the phone to the telephone line of the IAD and check whether there is feed.
   • If yes, ensure that the cables in the cable distribution frame (CDF) are correctly connected.
   • If no, go to Step 3.

3. Use a telephone line delivered with the device to replace the existing one.
   • If the problem is resolved, the procedure ends.
   • If the problem persists, go to Step 4.

4. Replace the board.
   • If the problem is resolved, the procedure ends.
   • If the problem persists, go to Step 5.

5. Check the power supply, especial at small ports.