Full duplex is the same as half duplex. This is one of those myths of omission. A telecommunications line is either full duplex or half duplex. Many companies are now selling Ethernet connections, which they call 10-Mbps lines. That's a misleading appellation.
Ethernet is half-duplex.
But no one does that because everyone knows that a T-1 line is 1.5 Mbps. That means that if you only send or receive data, you'll see bursts of around 9 Mbps. Like ATM, Ethernet has a substantial overhead that keeps it from reaching a full 10 Mbps, even when bursting. But if you send and receive data at the same time, you'll see a long-term throughput of about 5 Mbps per side. If you simply want to host a Web site, Ethernet is both adequate and affordable.