The NetVanta 3000 Series of IP access routers from ADTRAN offers businesses of all sizes a cost-effective Internet access or corporate connectivity via Frame Relay or point-to-point networks. They include stateful inspection firewall, Network Address Translation, DHCP server and client, and a single slot used to house a variety of interchangeable Network Interface Modules for speeds ranging from 56 Kbps to full T1. These routers also offer an optional DSX-1 interface for digital voice connectivity along with analog or ISDN dial backup options for disaster recovery.