Home/Office Wiring Instructions; Basic Residential Phone Wiring; Looped Wiring; Single-Line Wiring - Fortinet FortiVoice FVC Series Hardware Manual

Home/Office Wiring Instructions

This section describes phone wiring for North America, and is provided as reference information
for other countries and regions.
BT PLUGS — To connect telephones with BT style plugs, it is recommended that extensions
are wired through a master socket or an in-line adapter with a capacitor. This also ensures
compatibility with some telephones that require 3-wire connections for the telephone to ring.

Basic residential phone wiring

Looped wiring

Loop wiring is common in most residential houses. The demarcation point (see next page)
breaks the incoming phone lines into 'loops' that can run the length of the entire house, but are
often broken into smaller loops that serve different areas of the house.
All houses have at least one telephone line, however it is also common to have two or more
incoming phone lines. Whether you are wiring single, dual or multiple lines, you will still be using
phone cord with four wires. How each phone jack is wired to the loops will determine if the
phone jack is on Line 1 or Line 2.
This document describes single- and two-line wiring configurations. Many of the processes can
also be applied to multi-line wiring.

Single-line wiring

Two-line wiring

Home/Office Wiring Instructions
For a single telephone line, all phones in the building will usually be
wired using the RED and GREEN wires of the phone cord. The other
two wires, BLACK and YELLOW, are not used.
The demarcation point connects the incoming RED and GREEN pair
to various loops within the building. It is probable that the building is
also wired with a BLACK and YELLOW pair, however these are not
connected to any wall jacks.
Two incoming phone lines are denoted in pairs, usually the RED and
GREEN are used as Line 1, and the BLACK and YELLOW are Line 2.
All four wires are looped throughout the building so that each jack has
access to Line 1 and Line 2. How each jack is connected to the RED,
GREEN, BLACK, and YELLOW wires determines if it is connected to
Line 1, Line 2, or both.
Page 8 FortiVoice FVC Hardware Specification Guide