Individual Category 5e and better-rated 8P8C jacks (keystone and patch panel) with IDC connectors commonly use the same punchdown 'teeth' dimensions and tools as a full size 110 block.ġ10 style blocks allow a much higher density of terminations in a given space than older style termination blocks (66 style or wire wrap) because of their stacking capability. 110 blocks are preferred over 66 blocks in high-speed networks because they introduce less crosstalk and many are certified for use in Category 5, Category 6 and Category 6a wiring systems. At the other end, 110 connections may be used with keystone modules that are attached to wall plates. In switch rooms, 110 blocks are often built into the backs of patch panels to terminate cable runs. The 110 style insulation-displacement connection is often used at both ends of Networking cables such as Category 5, Category 5e, Category 6, and Category 6e cables which run through buildings, as shown in the image.

The 110 block has been slowly replacing the 66 block, especially for data communications usage. In commercial settings, this style of home run or star topology wiring was already in use on 66 blocks in telecom closets and switchrooms. At the outlet box, cables are attached to ports with insulation-displacement contacts (IDCs), and those ports fit into special faceplates. Modern homes usually have phone service entering the house to a single 110 block, whence it is distributed by on-premises wiring to outlet boxes throughout the home in star topology. These screw-terminal blocks have been slowly replaced by 110 blocks and connectors. Usage Telephone distribution Įarly residential telephone systems used simple screw terminals to join cables to sockets in a tree topology.

110 punch block