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Telephone Line Troubleshooting Guide

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Posted on  January 15, 2015  by FS.COM

Tags:Network Troubleshooting

telephone line problems You may get frustrated about the bad job of your telephone more than once at home. When you find your telephone at home is not working properly, the first thing you should do is finding the source of the problem to get repaired. This article is right about how to testing and troubleshooting your telephone line in your house. Testing phone lines in your home is relatively simple if you can carefully learn and analyze your own system.

First, you should check if it is the problems of the telephone itself, unplugging all the phone devices such as the computer, answering machines, etc. throughout your house. Take your line tester (or a phone that you are sure workable), go around and plug it into every outlet, checking for the proper lighting sequence (if it is a telephone, you may here dial tone). If all jacks appear to be dead or you don't get dial tone, the problem is not with your telephones or telephone equipment.

Once you have make sure it is the phone line system other than the telephone or telephone equipment's problem, the next step is to test you're the wiring. A variety of things can cause the telephone wiring to crash such as improperly touching wires, mice eating cable or an electrical surge frying a telephone jack. The text blow will try to give as much information for all the possible problems.

Disconnect your inside wiring from the telephone company, who provided you with service through four or more wires leading to the outside of your house. All these wires are connected into a box called a NID, network interface, locating outside your home for ease access by the telephone company. You should disconnect the plug serving the bad line. If you have a junction block or an entrance bridge, separate the telephone company's wiring from the block or bridge. Use the multi-meter to test the continuity of your wiring. It the continuity that allows the electricity to freely flow through it, when two bare wires are touching, it will make continuity. Since in the wiring system, each color of wires is working independently, any continuity between any wires of different colors will cause the defective condition. We should find the defect and correct it. Do this by touching your probes across any two wires of different colors and get no continuity. You can do this at a terminal block or entrance bridge without disconnecting any of your inside wires. Key point of this test is to make sure all phones and devices unplugged.

Once a continuity is found, there may be either a touching existing somewhere in the wiring, or a touching behind a telephone jack or at a junction block or entrance bridge. Defective phone jack may be caused by an electrical surge. If either of them happened, just separate the touching wires or tighten the conditions. After that, use the phone that you have make use is problem free in previous step to test the line. If it is still not working, continue to other blocks and telephone jacks.

Keep in mind, there may be secondary junction blocks or parallel connections in your home, which are used to run phone cable to remote location by splicing into another phone's cable, rather than running a new cable from the main junction block or protector. If you see two cable from the junction block leading into the house, but you know you have six telephone outlet, it indicate that there are secondary junction blocks in your wiring system. Try to examine for touching bare wire or loose wires by opening up the outlets throughout the next phase of your troubleshooting.

After all the above step done, the next step is to find out whether it's the cable itself or the phone outlets, or jacks. Disconnect one wire of a pair (red or green, black or yellow) from each jack, this will disable all the jacks without having to totally disconnect all the wires. Reconnect the circuit to the telephone company's wires. Then one by one, test the phone jack in the NID box outside your house with a phone line tester. If none of the jacks work, then you have a short in the cable; if some wok and others don't, the problem is probably in the jacks which is don't work. This time, you should get a new jack and try to connect the existing wires to it.

At last, here we introduce some common telephone troubleshooting problems and solutions for you, as the table shown below.

Problems Causes Fixes
Buzzing sounds on the line. Incorrect wiring or wires touching metal. Check for proper wire colors and connections.
Static sound on the line. Phone line wires wet or have loose connections. Check the wires and inside the phone jack covers for signs of moisture.
No sound on the line called dead air. Wire off, wire crossed, or wire is shorted to another. Check phone jacks to see if wires are touching each other. It is often bare wires touching.

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