CISCO - WAN NETWORK INTERFACE MODULE - SERIAL ADAPTER (NIM-4T). KEY FEATURES : DEVICE TYPE : SERIAL ADAPTER FORM FACTOR : PLUG-IN MODULE PORTS : RS-232/449/530/V.35/X.21 X 4 DATA LINK PROTOCOL : RS-232, RS-530, X.21, V.35, RS-449, RS-530A DATA TRANSFER RATE : 8 MBPS DESIGNED FOR : CISCO 4451-X, 4451-X APPLICATION EXPERIENCE, 4451-X INTEGRATED SERVICES ROUTER, 4451-X INTEGRATED SERVICES ROUTER SECURITY BUNDLE, 4451-X INTEGRATED SERVICES ROUTER VOICE AND VIDEO BUNDLE, 4451-X INTEGRATED SERVICES ROUTER VOICE SECURITY BUNDLE CONDITION : NEW FACTORY SEALED. AVAILABILITY : IN STOCK. OUR WARRANTY : 30 DAYS.