A bit array that contains the bit map representing the hardware capabilites of the port. The bit 7 tells if the port supports auto-negotiation. If the auto negotiation is on, the port will have multiple speed capabilities while if the auto negotiation is not supported, the hardware will only be capable for one speed: bit 0 - 10 BASE-T half duplex capable bit 1 - 10 BASE-T full duplex capable bit 2 - 100 BASE-TX half duplex capable bit 3 - 100 BASE-TX full duplex capable bit 5 - 100 BASE-FX full duplex capable bit 6 - 100 BASE-FX half duplex capable bit 7 - auto negotiation support capability When auto negotiation is supported only bits 0-3 are used to indicate the capabilities available for negotiation, and any or all of these bits may be set as long as at least one bit is set. When auto negotiation is NOT supported (bit 7 = 0) all other bits are used to indicate the capabilities supported by the port, but which must be manually configured.