... Form Factor: External - modular - 1U Digital Signaling Protocol: ADSL, ADSL2, ADSL2+ CISCO1841-ADSL2-BProduct Description Cisco 1841 bundle, HWIC with ADSL over POTS ... Protocol IPSec Remote Management Protocol SNMP Digital Signaling Protocol ADSL, ADSL2, ADSL2+ Features Cisco IOS , firewall protection, 128-bit encryption, hardware ... encryption Power AC 120/230 V ( 50/60 Hz ) CISCO1841-ADSL2-B