| C1921-VA/K9 | Cisco 1921 ISR with EHWIC-VA-DSL-A bundle |
| Service integration | The Cisco 1921 offers increased levels of services integration with data, security, wireless, and mobility services, enabling greater efficiencies and cost savings. |
| Embedded hardware-based cryptography acceleration (IPsec + SSL) | Yes |
| RJ-45 onboard LAN/WAN 10/100/1000 ports | 2 |
| EHWIC slots | 2 |
| Doublewide EHWIC slots (use of a doublewide EHWIC slot will consume 2 EHWIC slots) | 1 |
| Cisco Integrated Services Module (ISM) slots | 0 |
| Memory (DDR2 DRAM): Default/maximum | 512 MB/512 MB |
| USB flash memory (internal): Default/maximum | 256 MB/256 MB |
| External USB flash-memory slots (Type A) | 1 |
| USB console port (mini-Type B) (up to 115.2 kbps) | 1 |
| Serial console port (up to 115.2 kbps) | 1 |
| Serial auxiliary port (up to 115.2 kbps | 1 |
| Integrated power supply | AC and DC power-supply models |
| Power-supply options | POE (external) - on AC models only |
| Redundant-power-supply support | No |
| AC input voltage | 100-240V ~ |
| AC input frequency | 47-63 Hz |
| AC input current range AC power supply (maximum) (amps) | 1.5-0.6 |
| AC input surge current | <50A |
| Typical power (no modules) | 25W |
| Maximum power capacity with AC power supply | 60W |
| Maximum power capacity with PoE power supply (platform only) | 70W |
| Maximum PoE device power capacity with PoE power supply | 80W |
| DC power input | 32-60 VDC, 4A, positive or negative, single source |
| DC input wire size | AWG 14 (2.0 mm2) |
| Safety ground-wire size | AWG 14 (2.0 mm2) |
| Safety ground-wire size | AWG 14 (2.0 mm2), minimum |
| Wire terminal (lug) | Amp/Tyco No.32957 |
| Overcurrent protection | 20A maximum |
| Rack height | 1 rack unit (1RU) |
| Dimensions (H x W x D) | 1.75 x 13.5 x 11.5 in. (4.45 x 34.29 x 29.21 cm) |
| Rack-mount 19 in. (48.3 cm) EIA | Optional |
| Wall-mount (refer to installation guide for approved orientation) | Yes |
| Telecom | TIA/EIA/IS-968 CS-03 ANSI T1.101 IEEE 802.3 RTTE Directive |