Telephone lines

In this article we will discuss Telephone lines, will make brief discussion on Telephone lines, last article we discuss about Frame Relay.

Device that coverts sound and electrical waves into audible relays, and is used for communication. The telephone consists of two essential parts; a microphone and a speaker. This allows the user to speak into the device and also hear transmissions from the other user.

Telephone lines are used to deliver landline telephone service and Digital subscriber line (DSL) phone cable service to the premises. Telephone overhead lines are connected to the public switched telephone network.

The telephone network starts in your house. A pair of copper wires runs from a box at the road to a box (often called an entrance bridge) at your house. From there, the pair of wires is connected to each phone jack in your house (usually using red and green wires).

The most common type is the 4-strand (2 twisted pair). This consists of red and greenwires, which make a pair, and yellow and black wires, which make the other pair. One telephone line needs only 2 wires.

Nowadays, Cat5 cable is commonly used instead of station wire for telephony. In which case, start with the blue pairs and use the orange pairs for the second line. Nowadays, Cat5 cable is commonly used instead of station wire for telephony.

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