Pins in an rj45 connector are used to transmit data when used on a 100baset ethernet network are Pin 1 and 2 data transmission and reception occur over a 100BaseT cable using pins 1 and 2, respectively.
A registered jack (RJ) is a physically standardized network interface for connecting telephone or data equipment. The physical connector types used by registered jacks are mostly modular and 50-pin miniature ribbon connectors. The most widely used twist-pair connector is an RJ45 connector, also known as an 8-position, 8-contact (8P8C) modular plug and jack. The RJ45 connector on an Ethernet cable contains 8 pins. While pins 4 & 5 (blue) and pins 7 & 8 (brown) are inactive, pins 1 & 2 (green) and 3 & 6 (orange) are used for data transmission.
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