Hi,
because the W5200 Chip on the WIZ820io privide 8 sockets:
http://www.wiznet.co.kr/Sub_Modules/en/product/Product_Detail.asp?cate1=5&cate2=7&cate3=56&pid=1144
iEthernet W5200 ? Fast SPI Ethernet Controller
- High Speed Serial Peripheral Interface (SPI MODE 0, 3)
- Hardwired TCP/IP Protocols : TCP, UDP, ICMP, IPv4 ARP, IGMP, PPPoE, Ethernet
- 10BaseT/100BaseTX Ethernet MAC/ PHY embedded
- Auto Negotiation ( Full and half duplex, 10 and 100-based )
- Auto MDI/MDIX (Straight-through or Crossover)
- ADSL connection (with support PPPoE Protocol & PAP/CHAP Authentication mode)
[color=red:b9b7619a94][b:b9b7619a94]- 8 independent sockets simultaneously[/b:b9b7619a94][/color:b9b7619a94]
- Internal 32Kbytes Memory for Tx/Rx Buffers
- Multi-function LED outputs (Full/Half duplex, Link, Speed)
- Power down mode
- Wake on LAN
- 0.18 μm CMOS technology
- 3.3V operation with 5V I/O signal tolerance
- Lead-Free Package
- Small & Compace 48 Pin QFN Package
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