What is the difference between a "110 block" and a "66 block"? 

Both 66 and 110 blocks are insulation displacement connection (IDC) devices, which are key to reliable data connections. 66-clip blocks have been the standard for voice connections for many years. Although 66-clip blocks historically have been used for data, they are not an acceptable connection for Category 5 or higher cabling. The 110-type connection, on the other hand, offers: (A) higher density (more wiring in a smaller space) and (B) better control (less movement of the wires at the connection). Since more and more homes and businesses call for both voice and data connections, it is easy to see why it makes sense to install 110-type devices in most situations. 

66 Punch Down Block
110 Punch Down Block
The way they are most commonly seen:

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Last Updated: 07 Jun 2004
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