110 block

A 110 block is a type of punch block used to connect sets of wires in a structured cabling system. 110 is also used to describe a type of Insulation-displacement connector used to terminate twisted-pair cables which uses the same punchdown tool as the 110 block.

Usage

Telephone distribution

Early residential telephone systems used simple screw terminals to join cables to sockets in a . Since about 2000Fact|date=March 2007, these screw-terminal blocks have been slowly replaced by 110 blocks and sockets. 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 a . At the outlet box, cables are punched down to standard RJ-11 sockets, which fit in special faceplates.

In commercial settings, this style of "home run wiring" was already in use on 66 blocks in telecom closets and switchrooms. The 110 block has been slowly replacing the 66 block, especially for telephone usage.

Computer networks

The 110 block is often used at both ends of Category 5 cable runs through buildings, as shown in the image. In switchrooms, 110 blocks are used to connect cables to patch panels. At the other end, 110 connections are found in the modular sockets in faceplates. 110 blocks are preferred over 66 blocks in high-speed networks because they introduce less crosstalk and thus are certified for use in Cat5 systems.

ee also

* Telecommunications Industry Association
* Electronic Industries Alliance
* Electrical wiring