Intro to PBX Installation

A little over a month ago, we moved into a new building and I was responsible for overseeing the phone system and network install. We purchased a Inter-Tel Axxess 7.0 system, which was an upgrade from our old accent system. I had little previous experience with 66-Block (also known as a M-Block) or using a punch down tool. The 66-Block has 50 rows and 4 columns of metal v-shaped connectors. The left two connectors are electrically bonded and the right two connectors are electrically bonded on each row. If there is a bridge in the center then all four would be electrically bonded.

Each side of the block could hold 25-pair amphenol cable or 25-pair cat 3. Each side could also hold six lines of 4-pair cat 3 or cat 5 which was the configuration that our station phones had in our building. Odd rows are usually the Tip or positive ground flow of current and the even rows are the Ring or negative flow of current. The pattern for old type of phone line is black, red, green, yellow where red is the ringer and new type phone line pattern is white/orange, blue/white, white/blue, orange/white. The inter-tel station phone works off of the outside pair (yellow and black), whereas for normal phones it is not that import if the pairs are reverse. Inter-tel station keysets the phone would not power on if this was such.