Mode 3 (telephone)
Encyclopedia
In telephony
, mode 3 is a method of line sharing in which the line passes through a device (the mode 3 device) to connect to other devices. This enables the mode 3 device to control the line, and gain priority in need.
It is a common alternative to parallel connection.
For example, a dial-up computer modem
is generally provided with two line connectors, often labelled line and phone. The outside line is connected to the line connector, and handsets may be connected to the phone connector. When the modem is not in use, the line is connected to the handsets, but when the modem is in use, the phone connector is disconnected from the outside line. This prevents accidental interruption of the data service by raising the handset, which could occur if the two devices were simply connected in parallel.
Other devices often wired in mode 3 include:
In Australia
, mode 3 operation was facilitated by use of the 611 socket.
Telephone
The telephone , colloquially referred to as a phone, is a telecommunications device that transmits and receives sounds, usually the human voice. Telephones are a point-to-point communication system whose most basic function is to allow two people separated by large distances to talk to each other...
, mode 3 is a method of line sharing in which the line passes through a device (the mode 3 device) to connect to other devices. This enables the mode 3 device to control the line, and gain priority in need.
It is a common alternative to parallel connection.
For example, a dial-up computer modem
Modem
A modem is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. The goal is to produce a signal that can be transmitted easily and decoded to reproduce the original digital data...
is generally provided with two line connectors, often labelled line and phone. The outside line is connected to the line connector, and handsets may be connected to the phone connector. When the modem is not in use, the line is connected to the handsets, but when the modem is in use, the phone connector is disconnected from the outside line. This prevents accidental interruption of the data service by raising the handset, which could occur if the two devices were simply connected in parallel.
Other devices often wired in mode 3 include:
- Fax machines.
- Autodiallers including:
- Back to base intrusion alarmBurglar alarmBurglar , alarms are systems designed to detect unauthorized entry into a building or area. They consist of an array of sensors, a control panel and alerting system, and interconnections...
s. - Vitalcall and similar services.
- Back to base intrusion alarm
In Australia
Australia
Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...
, mode 3 operation was facilitated by use of the 611 socket.
External links
- Use of Type 604 / 611 Plug & Socket (Auxiliary equipment wiring modes) (PDF 136KB), comprehensive application notes based on Australia Post Office specification 1222 Issue 1.