Hardware Installation Guide for Cisco 4000 Series Integrated Services Routers - Overview of the Cisco 4000 Series ISRs [Cisco 4000 Series Integrated Services Routers] - Cisco
CISCO ISR 4000 SERIES ROUTER DATASHEET
Cisco 4000 Series Integrated Services Routers Data Sheet
Cisco 4000 Series Integrated Services Router Packet-over-T3/E3 Service Module Data Sheet - Cisco
Cisco 4000 Series Router Datasheet | PDF | Router (Computing) | Computer Network