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Cisco 3900 Series Integrated Services Routers

Series Comparison

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Models Comparison
  3945E 3925E 3945 3925 2951 2921 2911 2901 1941 / 1941W 1921
Form Factor 3 rack units (RU) 3 RU 3 RU 3 RU 2 RU 2 RU 2 RU 1 RU 2 RU 1 RU
Integrated WAN Ports 4 Gb Ethernet (GE) (2 SFP) 4 GE (2 SFP) 3 Gigabit Ethernet
(2 SFP) 		3 Gigabit Ethernet
(2 SFP) 		3 Gigabit Ethernet
(1 SFP) 		3 Gigabit Ethernet
(1 SFP) 		3 Gigabit Ethernet 2 Gigabit Ethernet 2 Gigabit Ethernet 2 Gigabit Ethernet
Interface slots (enhanced high-speed WAN interface card [EHWIC]) 3 3 4 4 4 4 4 4 2 2
Service-module slots 4 2 4 2 2 1 1 0 0 0
Integrated services module (ISM) slots 0 0 1 1 1 1 1 1 1 0
Packet-voice data-module (PVDM) slots 3 3 4 4 3 3 2 2 0 0
USB Ports (v2.0) 2 2 2 2 2 2 2 2 2 1
Default/maximum flash memory 256 MB/ 8 GB 256 MB/ 8 GB 256 MB/ 8 GB 256 MB/ 8 GB 256 MB/ 8 GB 256 MB/ 8 GB 256 MB/ 8 GB 256 MB/ 8 GB 256 MB/ 8 GB 256 MB/256 MB
Default/maximum synchronous dynamic RAM (SDRAM) 1 GB/ 4 GB* 1 GB/ 4 GB* 1 GB/ 4 GB* 1 GB/ 4 GB* 512 MB/ 4 GB* 512 MB/ 2.5 GB 512 MB/ 2.5 GB 512 MB/ 2.5 GB 512 MB/ 2.5 GB 512 MB/512 MB
Modular LAN switchports (with optional Power over Ethernet) 98** 74 ** 98** 74 ** 50** 50** 24** 16 11 9
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 Yes Yes Yes Yes Yes Yes
Onboard hardware VPN acceleration (Digital Encryption Standard [DES], Triple DES [3DES], and Advanced Encryption Standard [AES]) Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Intrusion Prevention Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Content Filtering Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Unified Communications  
Local Conferencing Yes Yes Yes Yes Yes Yes Yes Yes - -
Voice and Video DSP support PVDM3 and PVDM2 PVDM3 and PVDM2 PVDM3 and PVDM2 PVDM3 and PVDM2 PVDM3 and PVDM2 PVDM3 and PVDM2 PVDM3 and PVDM2 PVDM3 and PVDM2 - -
Survivable Remote Site Telephony (SRST) Up to 1500 Up to 1350 Up to 1200 Up to 730 Up to 250 Up to 100 Up to 50 Up to 35 - -
Cisco Unified Communications Manager Express Up to 450 Up to 400 Up to 350*** Up to 250*** 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 32 ports; 300 mailboxes 32 ports; 300 mailboxes 32 ports; 300 mailboxes 32 ports; 300 mailboxes 10 ports; 100 mailboxes - -
Session Initiation Protocol (SIP) sessions 2500 2000 1000 800 600 400 200 100 - -
Digital Voice Support Up to 660 Up to 420 Up to 720 Up to 480 Up to 400 Up to 240 Up to 150 Up to 100 - -
Maximum voice support for analog and Basic Rate Interface (BRI) Foreign exchange station (FXS): 108
Foreign exchange office (FXO): 60 BRI: 38 		FXS: 60
FXO: 36
BRI: 22 		FXS 112, FXO 64, BRI 40 FXS 64, FXO 40, BRI 24 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.