Cisco 2901

Cisco 2911

Cisco 2921

Cisco 2951

Services and Slot Density

Embedded Hardware-Based Cryptography and Acceleration (IPSec + SSL)

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