How do the service module slots in the 3900 series ISRs compare to traditional router slots?

The service module slots in the 3900 series Integrated Services Routers (ISRs) are specifically designed to accommodate various service modules that enhance the router's capabilities. These slots are actually wider than traditional router slots, allowing for more advanced and feature-rich modules to be inserted. This design is crucial because the wider slots support additional functionalities such as voice processing, security features, and enhanced performance options that are not achievable with the narrower slots typically found in older or more basic routers.

The increase in width also often corresponds to the ability to handle higher throughput, making the 3900 series versatile for integrated networking tasks which go beyond standard routing and switching capabilities. This evolution from narrow to wider slots signifies advancement in router technology, accommodating a broader array of services and performance enhancements vital for modern networking demands.