Description: This document explains the pin-allocation of a twisted-pair cable. Twisted pair cable: For connecting a network card with a ’normal’ hub port one uses a (1-1)-cable: Pin Colour Ethernet Colour Pin ---------------------------------------------------------------- 1 orange transmit data + orange 1 2 orange/white transmit data - orange/white 2 3 green receive data + green 3 4 blue/white unused blue/white 4 5 blue unused blue 5 6 green/white receive data - green/white 6 7 brown unused brown 7 8 brown/white unused brown/white 8 Front view of the RJ45-connectors: The colours green and red marking only RX (RD) and TX (TD)! In short: 1-1, 2-2, 3-3, 6-6 From the network card to the Ethernet connector of the NTBBA such a standard Ethernet-cable (UTP, CAT5) is being used. A similar cable of the categories 3, 4 or 6 may also be used.) Cross-over cable: For connecting two network cards and/or hubs one uses a crossed cable (crossover-cable). Pin Colour Ethernet Coulour Pin ---------------------------------------------------------------- 1 orange transmit data + green 1 2 orange/white transmit data - green/white 2 3 green receive data + orange 3 4 blue/white unused brown/white 4 5 blue unused brown 5 6 green/white receive data - orange/white 6 7 brown unused blue 7 8 brown/white unused blue/white 8 Front view of the RJ45-connectors: The colours green and red marking only RX (RD) and TX (TD)! In short: 1-3, 2-6, 3-1, 6-2