Zyxel Prestige 661H-D, Fast Ethernet, Black, Blue Zyxel Prestige 661H-D. Networking standards: IEEE 802.1D, IEEE 802.1Q, Ethernet interface type: Fast Ethernet, Cabling technology: 10/100Base-T(X). DSL specification: G.dmt(G.992.1), G.lite(G992.2), G.dmt.bis(G.992.3), G.lite.bis(G.992.4), (G.992.5). Management protocols: SNMP, Telnet, HTTP, FTP, Supported network protocols: TCP/IP, UDP/IP, IPSec, PPTP. Security algorithms: 3DES, DES, MD5, SHA-1, Firewall security: Denial-of-Service (DoS) protection, Authentication method: PAP, CHAP. Product colour: Black, Blue