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Cisco 2900 Series Routers product comparison


  2951 2921 2911 2901
Form Factor 2 RU 2 RU 2 RU 1 RU
Integrated WAN Ports 3 Gigabit Ethernet
(1 SFP)		 3 Gigabit Ethernet
(1 SFP)		 3 Gigabit Ethernet 2 Gigabit Ethernet
Interface slots (enhanced high-speed WAN interface card [EHWIC]) 4 4 4 4
Service-module slots 2 1 1 0
Integrated services module (ISM) slots 1 1 1 1
Packet-voice data-module (PVDM) slots 3 3 2 2
USB Ports (v2.0) 2 2 2 2
Default/maximum flash memory 256 MB/ 8 GB 256 MB/ 8 GB 256 MB/ 8 GB 256 MB/ 8 GB
Default/maximum synchronous dynamic RAM (SDRAM) 512 MB/ 4 GB* 512 MB/ 2.5 GB 512 MB/ 2.5 GB 512 MB/ 2.5 GB
Modular LAN switchports (with optional Power over Ethernet) 50** 50** 24** 16
Advanced Security Enabled via security license for the Universal IOS image. IPS and content filtering need additional subscription licenses.
Stateful Firewall Yes Yes Yes Yes
Onboard hardware VPN acceleration (Digital Encryption Standard [DES], Triple DES [3DES], and Advanced Encryption Standard [AES]) Yes Yes Yes Yes
Intrusion Prevention Yes Yes Yes Yes
Content Filtering Yes Yes Yes Yes
Unified Communications  
Local Conferencing Yes Yes Yes Yes
Voice and Video DSP support PVDM3 and PVDM2 PVDM3 and PVDM2 PVDM3 and PVDM2 PVDM3 and PVDM2
Survivable Remote Site Telephony (SRST) Up to 250 Up to 100 Up to 50 Up to 35
Cisco Unified Communications Manager Express Up to 150 Up to 100 Up to 50 Up to 35
Cisco Unity Express (network module [NM], service module [SM], or ISM) 32 ports; 300 mailboxes 32 ports; 300 mailboxes 32 ports; 300 mailboxes 10 ports; 100 mailboxes
Session Initiation Protocol (SIP) sessions 600 400 200 100
Digital Voice Support Up to 400 Up to 240 Up to 150 Up to 100
Maximum voice support for analog and Basic Rate Interface (BRI) FXS 64, FXO 40, BRI 24 FXS 40, FXO 28, BRI 16 FXS 40, FXO 28, BRI 16 FXS 16, FXO 16, BRI 8

* Up to 2 GB available for use; upgrade to 4 GB will be available in future.
** LAN Switching counts for the Cisco 2911 through Cisco 3945 and Cisco 3945E routers are based on the latest generation of switch service modules.
*** Scales to documented phone support in 15.01 rebuild.
 

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