It should. The unit supports up to 4 Wan modules. The fastest module appars to be a T3 which is 43 mb. It all depends on your current connections, what types are availiable to you, and if you have module slots open.
Product Specifications - From 3Com
Ports: One console, one AUX serial; four MIM slots
WAN Interfaces: ISDN, ADSL, E1, T1, T3, E3, high-speed serial, X.25, PPP, PPPoE, MP, Frame Relay, HDLC/SDLC
LAN Interfaces: 10/100, 10/100/1000 Ethernet
WAN Routing: IP, IPX, OSPF, BGP-4, Integrated IS-IS, RIP V1/V2, Static Routing, MPLS L2 and L3 VPN