This object indicates the port speed and duplex capabilities that hardware can actually support on a port, and which may be advertised by the port using auto-negotiation. Bit 7 tells if a port supports pause frame capabilities (for full-duplex links) as a part of the advertisement. bit 0 - 10 half duplex advertisements bit 1 - 10 full duplex advertisements bit 2 - 100 half duplex advertisements bit 3 - 100 full duplex advertisements bit 4 - 1000 half duplex advertisements bit 5 - 1000 full duplex advertisements bit 6 - Mac PAUSE frame support advertisements bit 7 - Asymmetric PAUSE frame support advertisements If auto negotiation is not supported by the port hardware, then all bits will reflect a value of zero.