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50-Pin Telco (RJ21)

This connector is very common in 10BASE-T wiring. As opposed to the RJ45 connector, the 50-pin Telco connector concentrates up to 12 UTP connections onto one connection. This concentration of UTP ports is then broken out for connection to a punch-down block inside a building’s wiring closet. 50-pin Telco connections provide a very clean, uncluttered interface.

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