110 blocks come in either 100, 200, or 300 pair with rows of 50 pairs each and mount horizontally.<P>It is tons easier to troubleshoot phones that are on 66 blocks.<P>66 blocks are used for phone ...

A 66 Punch Block Each row of a 66 block is set up for one pair of wires to be spliced to another pair; however, any pair of clips can be used to connect any two wires. Advertisement THIS ...