Cisco 7206VXR Installation Guide - Page 133

A A P P E N D I X Industry-Standard Wiring Plans OL-5102-02 When you install more than a few terminals, you face the problem of organizing the wiring. AT&T has devised a uniform scheme for dealing with large numbers of wires for the telephone industry. The scheme uses two color codes-one for large numbers of wires organized in pairs and the other for smaller numbers of wires that may also be organized in pairs. We recommend the use of this wiring scheme whenever possible. For large numbers of wires, each pair is assigned a two-color code. The colors are selected from two groups of five, resulting in what is called a binder-group of 25 pairs. The colors used for a group are white, red, black, yellow, and violet. The colors used for "pair within group" are blue, orange, green, brown, and slate. Each pair must have a unique color combination. One wire within each pair has a solid background of its group color and stripes of the "pair within group" color; the second wire has the colors reversed. Table A-1 lists the sequences. Note that red-brown and red-orange wires can be easily confused. Table A-1 Telephone Industry 25-Pair Color Code and Pin Numbers Pair Number 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 Wire Number 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 Solid Color White Blue White Orange White Green White Brown White Slate Red Blue Red Orange Red Green Stripe Color Blue White Orange White Green White Brown White Slate White Blue Red Orange Red Green Red Pin Number 26 1 27 2 28 3 29 4 30 5 31 6 32 7 33 8 Cisco 7206 Installation and Configuration Guide A-1