Cisco Catalyst 6500 6-port E1 Interface Port Adapter. Connectivity technology: Wired, Host interface: Ethernet. Data transfer rate (max): 2048 Mbit/s. Certification: IEC/EN 60950, AS/NZS 3260, TS001, EN 55022, EN 55024 CE. Line coding format: HDB3, Compatible operating systems: Cisco IOS 12.4(8a)/12.2(18)SXF3, Networking features: G.703, G.704, G.706