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The Cisco 2921 ISR Router Integrated Services Router (ISR) is a modular router featuring embedded hardware encryption, voice and video capable digital signal processor (DSP) slots, optional firewall, intrusion prevention, call processing,and application services.

The chassis offers a single:

1. Internal Services Module (ISM) slot
2. 4 eHWIC slots
3. 2 10/100/1000 WAN ports
4. 2 GE DSP slots
5. 256MB of Flash memory
6. 512MB of DRAM in a 1U form factor

The Cisco  business 2921 ISR Router supports the industry’s widest range of wired and wireless connectivity options such as T1/E1, T3/E3, xDSL, copper, and fiber GE.