Warning Tone
Warning Tone is a high steady tone which warns an operator that the circuit he/she is connected to is not in condition for normal operation. Examples: An operator at an Automatic Display Call Indicator puts a plug into wrong jack, or an operator at a sender monitor puts a plug into a sender supervisory jack while the sender is under a test.

WATS: Wide-Area Telephone Service
Wide-Area Telephone Service (WATS), also known as Wide Area Telecommunications Service, is a specialized form of fixed-rate long-distance telecommunication service. WATS lines are commonly used by businesses and government agencies. Some individuals and small corporations also have WATS subscriptions. There are three types of WATS lines: IN-WATS (for incoming calls), OUT-WATS (for outgoing calls), or a combination of both services. IN-WATS lines have telephone numbers with certain area codes reserved expressly for that purpose, such as 800, 888, or 877. People calling these numbers are not charged a long-distance toll. Instead, the recipient (subscriber) is charged a fixed monthly rate up to a certain number of hours of usage. Beyond the limit, an additional toll is imposed. OUT-WATS lines are, in effect, fixed-rate long-distance subscriptions.

Wink Start
Wink Start is a method of E&M signaling. When the signaling leads indicate a change to an off-hook state, the other side must send a momentary wink (on-hook to off-hook to on-hook transition) on the correct signaling lead before the call signaling information can be sent by the sending side. After the call signaling information is received, the side that sent wink goes off-hook again and stays that way for the duration of the call.

Wink Start Signaling
Wink Start Signaling is the most commonly used trunk signaling type. In Wink Start operation, the originating trunk circuit goes off-hook. The remote switch detects the off-hook signal, transmits an off-hook pulse that is between 140 and 290 mess in length, and returns to the idle (on-hook) state. The originating trunk detects the Wink Back, waits for at least 210 mess and outputs digits to the remote switch. When the call is answered, the terminating switch will indicate this by an off-hook condition.

Wire Center
Wire Center is the building in which one or more local switching systems are installed and where the outside cable plant is connected to the central office equipment.

Wire Center Serving Area
Wire Center Serving Area refers to the area of an exchange served by a single wire center.

Wire Tap
Wire Tap is an apparatus which is utilized to monitor conversations over telephone lines or the Internet by a third party, often by government agents. Historically, the monitoring connection was applied to the wires of the telephone line of the person who was being monitored and drew off or tapped a small amount of the electrical signal carrying the conversation so it is also called Telephone Tapping.

Work Area
Work Area in telecommunication system is the collection of all cable components between a horizontal-wiring wallplate or LAN outlet and end-user telecomm devices, such as telephones, data terminals, computers, modems, etc.