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| Product code | Cisco ISR4451-X/K9 |
| Aggregate Throughput (Default) | 1 Gbps |
| Aggregate Throughput (Performance License) | 2 Gbps |
| Aggregate CEF Only[5] Throughput (Boost License) | Over 4Gbps |
| Total onboard WAN or LAN 10/100/1000 ports | 4 |
| Total onboard WAN or LAN 10Gbps ports | - |
| RJ-45-based ports | 4 |
| SFP-based ports | 4 |
| Enhanced service-module slots | 2 |
| Doublewide service-module slots | 1 |
| NIM slots | 3 |
| OIR (all I/O modules) | Yes |
| Onboard ISC slot | 1 |
| Default memory DDR3 ECC DRAM (data plane) | 2 GB |
| Maximum memory DDR3 ECC DRAM (data plane) | 2 GB |
| Default memory DDR3 ECC DRAM (control/services plane) | 4 GB |
| Maximum memory DDR3 ECC DRAM (control/services plane) | 16 GB |
| Default flash memory | 8 GB |
| Maximum flash memory | 32 GB |
| External USB 2.0 slots (type A) | 2 |
| USB console port -type B mini (up to 115.2 kbps) | 1 |
| Serial console port - RJ45 (up to 115.2 kbps) | 1 |
| Serial auxiliary port - RJ45 (up to 115.2 kbps) | 1 |
| Power-supply options | Internal: AC, DC and PoE |
| Redundant power supply | Internal: AC, DC and PoE |
| Power Specifications | |
| AC input voltage | 100 to 240 VAC autoranging |
| DC Input Voltage | |
| Input Voltage | 48 – 60V |
| Input Current | 12A Max |
| AC input frequency | 47 to 63 Hz |
| AC input current range, AC power supply (maximum) | 7.1 to 3.0A |
| Typical power (no modules) (watts) | 158 |
| Maximum power with AC power supply (watts) | 450 (no PoE) |
| Maximum power with DC power supply (watts) | 437 (no PoE) |
| Sizes and Weights | |
| Dimensions (H x W x D) | 3.5 x 17.25 x 18.5 in (88.9 x 438.15 x 469.9 mm) |
| Rack height | 2 Rack Units (2RU) |
| Rack-mount 19in. (48.3 cm) EIA | Included |
| Wall-mount | No |
| Typical weight (fully loaded with modules) | 42.7 lb (19.4 kg) |
| Packaging Weight | 6.4 lb (2.9 kg) |
| Airflow | I/O side to bezel side |
| MTBF (Hours) | 480770 |
| Environmental Specifications | |
| Operating Conditions | |
| Temperature | 32 to 104ºF |
| (0 to 40ºC) | |
| Altitude | 0 – 6,560 ft. |
| Nonoperating Conditions | |
| Temperature | -40 to 158ºF |
| (-40 to 70ºC) | |
| Relative humidity | 5% to 95% |
| Altitude | 15,584 ft (4750m) |
ISR4451-X/K9 : Cisco ISR 4451 (4GE,3NIM,2SM,8G FLASH,4G DRAM)
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