This object allows specification of options for three areas: crossover Normally, DTE and hub sockets are wired such that they can connect with a straight-through cable, that is the hub has RX and TX circuits swapped (it has internal crossover). If a DTE must be connected directly to another DTE (or hub port to a port on another hub), a crossover cable must be used. The data card trunk interfaces have an automatic crossover function, which turns on or off crossover. Any sort of cable can then be used to connect to any sort of device (DTE or hub). duplex mode If duplex mode is full duplex, transmission is allowed while data are received. With half duplex, transmission must wait until the receiver is idle. speed The port can operate in 10 or 100 MBits per second. The values possible for this variable are: autoCrossoverAndPortSpeed(1) Allows the port to negotiate speed, duplex mode, and to enable or disable the internal crossover function. autoNegotiationPortSpeed(2) Allows the port to negotiate speed and and duplex mode. Internal crossover is on - a straight-through cable is needed to connect to a DTE (PC), a crossover cable is needed to connect to a repeater or hub. base100TFullDuplex(3) Speed is set to 100 MBits per second, with full duplex. Internal crossover is on. base100THalfDuplex(4) Speed is set to 100 MBits per second, with half duplex. Internal crossover is on. base10TFullDuplex(5) Speed is set to 10 MBits per second, with full duplex. Internal crossover is on. base10THalfDuplex(6) Speed is set to 10 MBits per second, with half duplex. Internal crossover is on.