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A type of punch block used to terminate or cross connect twisted pair wire. It is easily identifiable since it is a white plastic trough with 4 rows of pins in a column of 25 and usually hung vertically. These columns can be connected with C-clips that electronically connect these two sets of two rows. Used predominantly in telephone wiring and are typically rated Category 3, but can be Category 5 if needed. SEE ALSO: 110 Block, Punch Down Tool