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In telecommunications wire wrap is in common high volume use in modern communications networks for cross connects between copper wiring plant. For example, most phone lines from the outside plant go to wire wrap panels in a central office, whether used for POTS, DSL or T1 lines. Typically at a main distribution frame Internal Cross Facilities Assignments and External Cross Facilities Assignments, are connected together via jumpers that are wire wrapped. Wire wrap is popular in telecommunications since it is one of the most secure ways to attach wires, and provides excellent and consistent data layer contact. Wirewrap panels are rated for high quality data services, including Cat 5 grade wiring. The principal competitor in this application is punch blocks, which are quicker but less secure.