The cisco 2921 integrated services router isr delivers highly secure data voice video and application services for small offices key features include 3 integrated 101001000 ethernet ports with 1 port capable of rj 45 or sfp connectivity 1 service module slot 4 enhanced high speed wan interface card ehwic slots 3 onboard digital signal processor slots 1 internal service module slot for application services fully integrated power distribution to modules supporting 8023af power over e