ver Figure 1.2 - Multi Line Telephone The Telecom Handbook CHAPTER 1 Parts Of The Telephone First, we will point out the things you can see, and next we will get to what is inside. Here is a diagram of a typical tele- phone with its external parts labeled. Figure 1.3 Parts of the Telephone MOUNTING SWITCH HOOK (Connects (Under the Handset) to Wall) DISPLAY 12:42 MESSAGE WAITING EXT 1236 HANDSET EXT 1235 EXT 1234 SPEAKER EXT 1233 SPEED TRANS FEATURE BUTTONS DIAL PAD HANDSET CORD The telephone handset, also called the receiver. In fact, it includes both the receiver enabling you to hear and the trans- mitter through which you speak. It may also have a volume control or a bar that you can depress to mute either the re- ceiving or transmitting capability. (Buttons on the telephone may also control these functions.) Handsets come in different shapes and sizes and are usually made to work with a telephone from a specific manufacturer. The Telecom Handbook * 5 THE TELEPHONE The handset may be directly wired (also called hardwired) to the telephone cord, which in turn is directly wired into the telephone instrument, or there may be a plastic modular con- nector at one or both ends of the cord. People who spend the entire day on the telephone such as customer service representatives, stock brokerage trad- ers and switchboard attendants often use a headset instead of a handset. On many telephones, you must leave the hand- set attached and "off the hook" while using a headset, which is cumbersome. b. The handset cord. Also known as the curly cord. This often gets very twisted which can break or damage the wires inside causing interference (static or "noise" on the line). Holding it up and letting the handset dangle at the end, enabling the cord to unwind, can straighten it out. As mentioned above, most handsets are connected to the telephone with a small plastic modular connector that plugs into a jack opening on the telephone. Some handsets are hardwired into the telephone and cannot be unplugged. C. The mounting cord. A s