| Cisco 2901 | Cisco 2911 | Cisco 2921 | Cisco 2951 |
Services and Slot Density |
Embedded Hardware-Based Cryptography and Acceleration | Yes | Yes | Yes | Yes |
Cisco Unified SRST Sessions | 35 | 50 | 100 | 250 |
Cisco Unified CCME Sessions | 35 | 50 | 100 | 150 |
Total Onboard WAN 10/100/1000 Ports | 2 | 3 | 3 | 3 |
RJ-45-Based Ports | 2 | 3 | 3 | 3 |
SFP-Based Ports (use of SFP port disables the corresponding RJ-45 port) | 0 | 0 | 1 | 1 |
Service Module Slots | 0 | 1 | 1 | 2 |
Double-Wide Service Module Slots (use of a double-wide slot will occupy all single-wide service module slots in a 2900) | 0 | 0 | 1 | 1 |
EHWIC Slots | 4 | 4 | 4 | 4 |
Double-Wide EHWIC Slots (use of a double-wide EHWIC slot will consume two EHWIC slots) | 2 | 2 | 2 | 2 |
ISM Slots | 1 | 1 | 1 | 1 |
Onboard DSP (PVDM) Slots | 2 | 2 | 3 | 3 |
Memory DDR2 ECC DRAM - Default | 512 MB | 512 MB | 512 MB | 512 MB |
Memory (DDR2 ECC DRAM) - Maximum | 2 GB | 2 GB | 2 GB | 2 GB |
Compact Flash (External) - Default | slot 0: 256 MB
slot 1: none | slot 0: 256 MB
slot 1: none | slot 0: 256 MB
slot 1: none | slot 0: 256 MB
slot 1: none |
Compact Flash (External) - Maximum | slot 0: 4 GB
slot 1: 4 GB | slot 0: 4 GB
slot 1: 4 GB | slot 0: 4 GB
slot 1: 4 GB | slot 0: 4 GB
slot 1: 4 GB |
External USB 2.0 Flash Memory Slots (Type A) | 2 | 2 | 2 | 2 |
USB Console Port (Type B) (up to 115.2 kbps) | 1 | 1 | 1 | 1 |
Serial Console Port | 1 | 1 | 1 | 1 |
Serial Auxiliary Port | 1 | 1 | 1 | 1 |
Power-Supply Options | AC and PoE | AC, PoE, and DC | AC, PoE, and DC | AC, PoE, and DC |
RPS Support (External) | No | Cisco RPS 2300 | Cisco RPS 2300 | Cisco RPS 2300 |
Power Specifications |
AC Input Voltage | 100 to 240 VAC auto ranging | 100 to 240 VAC auto ranging | 100 to 240 VAC auto ranging | 100 to 240 VAC auto ranging |
AC Input Frequency | 47 to 63 Hz | 47 to 63 Hz | 47 to 63 Hz | 47 to 63 Hz |
AC Input Current Range AC Power Supply (Maximum) | 1.5 to 0.6A | 2.2 to 1.0A | 3.4 to 1.4A | 3.4 to 1.4A |
AC Input Surge Current | <50A | <50A | <50A | <50A |
Typical Power (No Modules) (Watts) | 40 | 50 | 60 | 70 |
Maximum Power with AC Power Supply (Watts) | 150 | 210 | 320 | 340 |
Maximum Power with PoE Power Supply (Platform Only) (Watts) | 175 | 250 | 370 | 405 |
Maximum End-Point PoE Power Available from PoE Power Supply (Watts) | 130 | 200 | 280 | 370 |
Maximum End-Point PoE Power Capacity with PoE Boost (Watts) | N/A | 750 | 750 | 750 |
DC Input Voltage | N/A | 24 to 60 Vdc, autoranging positive or negative | 24 to 60 Vdc, autoranging positive or negative | 24 to 60 Vdc, autoranging positive or negative |
DC Input Current | N/A | (MAX) 8A (24V)
3.5A (60V) | (MAX) 12A (24V)
5A (60V) | (MAX) 12A (24V)
5A (60V) |
Physical Specifications |
Dimensions (H x W x D) | 1.75 x 17.25 x 17.3 in. (44.5 x 438.2 x 439.4 mm) | 13.15 x 17.25 x 12 in. (88.9 x 438.2 x 304.8 mm) | 3.5 x 17.25 x 18.5 in. (88.9 x 438.2 x 469.9 mm) | 3.5 x 17.25 x 18.5 in. (88.9 x 438.2 x 469.9 mm) |
Rack Height | 1RU (rack unit) | 2RU | 2RU | 2RU |
Rack-Mount 19 in. (48.3 cm) EIA | Included | Included | Included | Included |
Rack-Mount 23 in. (58.4 cm) EIA | Optional | Optional | Optional | Optional |
Wall-Mount (refer to installation guide for approved orientation) | Yes | Yes | No | No |
Weight with AC Power Supply (No Modules) | 13.4 lb (6.1 kg) | 18 lb (8.2 kg) | 29 lb (13.2 kg) | 29 lb (13.2 kg) |
Weight with AC PoE Power Supply (No Modules) | 14.3 lb (6.5 kg) | 19 lb (8.6 kg) | 30 lb (13.6 kg) | 30 lb (13.6 kg) |
Typical Weight Fully Configured | 16 lb (7.3 kg) | 21 lb (9.5 kg) | 34 lb (15.5 kg) | 34 lb (15.5 kg) |
Airflow | Front to side | Side to side | Back and Side to Front | Back and Side to Front |
Optional Airflow Kit | N/A | Front to back | N/A | N/A |
Environmental Specifications |
Operating Conditions |
Temperature: 5,906 feet (1,800m) Maximum Altitude | 32 to 104ºF (0 to 40ºC) | 32 to 104ºF (0 to 40ºC) | 32 to 104ºF (0 to 40ºC) | 32 to 104ºF (0 to 40ºC) |
Temperature: 9,843 feet (3,000m ) Maximum Altitude | 32 to 77ºF (0 to 25ºC) | 32 to 104ºF (0 to 40ºC) | 32 to 104ºF (0 to 40ºC) | 32 to 104ºF (0 to 40ºC) |
Temperature: 13,123 feet (4,000m) Maximum Altitude | N/A | 32 to 86ºF (0 to 30ºC) | 32 to 86ºF (0 to 30ºC) | 32 to 86ºF (0 to 30ºC) |
Temperature: Short-Term (per NEBS) 5906 feet (1,800m) Maximum Altitude | N/A | 23°F to 122°F (-5 to 50°C) | N/A | 23°F to 122°F (-5 to 50°C) |
Altitude | 10,000 ft (3,000m) | 13,000 ft (4,000m) | 10,000 ft (3,000m) | 13,000 ft (4,000m) |
Relative Humidity | 10 to 85% | 5 to 85% | 10 to 85% | 5 to 85% |
Short-Term (per NEBS) Humidity | N/A | 5% to 90%, but not to exceed 0.024 kg water/kg of dry air | N/A | N/A |
Acoustic: Sound Pressure (Typical/Maximum) | 41/53 dBA | 51.8/62.9 dBA | 54.4/67.4 dBA | 54.4/67.4 dBA |
Acoustic: Sound Power (Typical/Maximum) | 49/61 dBA | 58.5/70.3 dBA | 62.6/74.5 dBA | 62.6/74.5 dBA |
Non-Operating Conditions |
Temperature | -40 to 158ºF (-40 to 70ºC) | -40 to 176ºF (-40 to 80ºC) | -40 to 158ºF (-40 to 70ºC) | -40 to 158ºF (-40 to 70ºC) |
Relative Humidity | 5 to 95% | 5 to 95% | 5 to 95% | 5 to 95% |
Altitude | 15,000 ft (4,570m) | 15,000 ft (4,570m) | 15,000 ft (4,570m) | 15,000 ft (4,570m) |
Regulatory Compliance |
Safety | UL 60950-1 CAN/CSA C22.2 No. 60950-1 EN 60950-1 AS/NZS 60950-1 IEC 60950-1 | UL 60950-1 CAN/CSA C22.2 No. 60950-1 EN 60950-1 AS/NZS 60950-1 IEC 60950-1 | UL 60950-1 CAN/CSA C22.2 No. 60950-1 EN 60950-1 AS/NZS 60950-1 IEC 60950-1 | UL 60950-1 CAN/CSA C22.2 No. 60950-1 EN 60950-1 AS/NZS 60950-1 IEC 60950-1 |
EMC | 47 CFR, Part 15 ICES-003 Class A EN55022 Class A CISPR22 Class A AS/NZS 3548 Class A VCCI V-3 CNS 13438 EN 300-386 EN 61000 (Immunity) EN 55024, CISPR 24 EN50082-1 | 47 CFR, Part 15 ICES-003 Class A EN55022 Class A CISPR22 Class A AS/NZS 3548 Class A VCCI V-3 CNS 13438 EN 300-386 EN 61000 (Immunity) EN 55024, CISPR 24 EN50082-1 | 47 CFR, Part 15 ICES-003 Class A EN55022 Class A CISPR22 Class A AS/NZS 3548 Class A VCCI V-3 CNS 13438 EN 300-386 EN 61000 (Immunity) EN 55024, CISPR 24 EN50082-1 | 47 CFR, Part 15 ICES-003 Class A EN55022 Class A CISPR22 Class A AS/NZS 3548 Class A VCCI V-3 CNS 13438 EN 300-386 EN 61000 (Immunity) EN 55024, CISPR 24 EN50082-1 |
Telecom | TIA/EIA/IS-968 CS-03 ANSI T1.101 ITU-T G.823, G.824 IEEE 802.3 RTTE Directive | TIA/EIA/IS-968 CS-03 ANSI T1.101 ITU-T G.823, G.824 IEEE 802.3 RTTE Directive | TIA/EIA/IS-968 CS-03 ANSI T1.101 ITU-T G.823, G.824 IEEE 802.3 RTTE Directive | TIA/EIA/IS-968 CS-03 ANSI T1.101 ITU-T G.823, G.824 IEEE 802.3 RTTE Directive |
