 
                                            - Cisco ISR 4221 (2GE, 2NIM, 4G FLASH, 4G DRAM, IPB).
- Cisco 4221 Integrated Services router is design to deliver advanced services to the small enterprise branch environment.
- Cisco ISR 4221 delivers 35Mbps thoughtput by default. With pay-as-you-grow performance, you can increase forwarding capacity to 75Mbps by buying licenses.

Specifications
| Product Code | Cisco ISR4221/K9 | 
| Aggregate Throughput | 35 Mbps to 75 Mbps | 
| Total onboard WAN or LAN 10/100/1000 ports | 2 | 
| RJ-45-based ports | 2 | 
| SFP-based ports | 1 | 
| NIM slots | 2 | 
| Default memory double-data-rate 3 (DDR3) error-correction-code (ECC) DRAM (Combined control/services/data planes) | 4 GB | 
| Maximum memory DDR3 ECC DRAM (Combined control/services/data planes) | 4 GB | 
| Default flash memory | 8 GB | 
| Maximum flash memory | 8 GB | 
| External USB 2.0 slots (type A) | 1 | 
| Serial console port - RJ45 (up to 115.2 kbps) | 1 (combo CON/AUX port) | 
| Serial auxiliary port - RJ45 (up to 115.2 kbps) | 1 (combo CON/AUX port) | 
| Power-supply options | External: AC Only | 
| AC input voltage | 100 to 240 VAC autoranging | 
| AC input frequency | 47 to 63 Hz | 
| AC input current range, AC power supply (maximum) | 1.5 to 0.6A | 
| AC input surge current | 90 A peak and less than 3 Arms per half cycle | 
| Typical power (no modules) (watts) | 24 | 
| Maximum power with AC power supply (watts) | 90 | 
| Dimensions (metric) | 43.7 x 322.6 x 254 mm | 
| Rack-mount 19in. (48.3 cm) EIA | Optional |