Mediant 500 MSBR with 1 E1/T1 Voice Interface and ADSL/VDSL over ISDN (annex B), 1000Base-T WAN and dual-mode SFP WAN Interfaces, with 5PPM clock, Includes Mediant 500 chassis, 4 Giga Ethernet switched LAN ports, and single AC power. Supports baseline VoIP, data and security features.