Allied Telesis Wireless ADSL Bridge/Router 4 Ethernet ports 1 USB port. Modulation: 16QAM, 64QAM, CCK, DBPSK, DQPSK, QPSK. DSL connection type: ADSL. Networking standards: IEEE 802.11b, IEEE 802.11g, IEEE 802.3, IEEE 802.3u, Number of users: 253 user(s). Supported network protocols: IP/TCP/UDP/ICMP/ARP/RARP. Firewall security: NAT, SPI, DoS & Packet filtering, VPN support: IPSec, PPTP & L2TP