1-12 Chapter 1: Routing
• Optional external redundant power supply (RPS)
- The Cisco 2911, 2921, and 2951 allow for power redundancy through the use of an external RPS device,
thereby decreasing network downtime and protecting the network from power-supply failures.
- Redundant power on the Cisco 2900 Series is supported through the Cisco RPS 2300 Redundant Power
System. You can use the Cisco RPS 2300 to provide redundant power for Cisco 2900 Series ISRs as well
as Cisco Catalyst switches.
- To use the Cisco RPS 2300, an external RPS adapter is required (configurable option) to connect the
platform to the external RPS.
•PoE boost
- When connected to an external RPS device, the Cisco 2911, 2921, and 2951 can operate in a PoE boost
configuration in lieu of redundant power mode, whereby the power capacity of the platform is increased
to twice the normal level to power additional PoE ports.
• Designed for flexible deployments
- The Cisco 2911 and 2951 are designed for NEBS environments
- The 2911 is 12” deep and has an optional fan filter for deployments in a variety of environments. An
assembly that provides front-to-back airflow is also available for 23” racks.
Specifications
Services and Slot Density Cisco 2901 Cisco 2911 Cisco 2921 Cisco 2951
Embedded hardware-based cryptography
acceleration (IPSec + SSL)
Ye s Ye s Ye s Ye s
Cisco Unified SRST Sessions
35 50 100 250
Cisco Unified CCME Sessions
35 50 100 150
Total onboard WAN 10/100/1000 Ports
2333
RJ-45-based ports
2333
SFP-based ports (use of SFP port disables
the corresponding RJ-45 port)
0011
Service Module slots
0112
Double-wide Service Module slots (use of a
double-wide slot will occupy all single-wide
service module slots in a 2900)
0011
EHWIC slots
4444
Double-wide EHWIC slots (use of a double-
wide EHWIC slot will consume two EHWIC
slots)
2222
ISM slots
1111
Onboard DSP (PVDM) slots
2233
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)
2222
USB Console port (Type B) (up to 115.2
kbps)
1111
Serial console port
1111
Serial auxiliary port
1111
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
WAN Optimization with WAAS Express
Ye s Ye s Ye s Ye s
Optimized TCP Connections with WAAS
Express
150 250 250 500
WAS Capacity with WAAS Express
6 Mbps 6 Mbps 6 Mbps 10 Mbps
DRAM Required for WAAS Express
2.5 GB 2.5 GB 2.5 GB 4 GB
Power Specifications
(6 pagine)
(28 pagine)
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