Telephone wiring modes refer to the wiring configurations used to connect auxiliary apparatus such as fax machines, data equipment, alarm panels, auto dialers, dial-up computer modem, etc. 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 for instance a mode 3 telephone wiring with the socket (usually 611 socket type) is used to connect an alarm system to the phone line for monitoring purposes.

The following schematic shows typical configuration of the Mode 3 Telephone Wiring Diagram.

Mode 3 Telephone Wiring Diagram

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