Guest

4451-X

3945E

3925E

3945

3925

2951

2921

2911

2901

1941

1941W

1921

Expand all

Features

Form Factor2 rack units (RU)3 rack units (RU)3 RU3 RU3 RU2 RU2 RU2 RU1 RU2 RU2 RU1 RU
Integrated WAN Ports4 GE (4 SFP)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 Ethernet2 Gigabit Ethernet2 Gigabit Ethernet2 Gigabit Ethernet2 Gigabit Ethernet
Interface slots (enhanced high-speed WAN interface card [EHWIC])N/A33444444222
Interface Slots, Network Interface Modules3N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A
Service-module slots242422110000
Integrated services module (ISM) slotsNA00111111110
Packet-voice data-module (PVDM) slots1 (ISC slot can host PVDM4)33443322000
USB Ports (v2.0)222222222221
Default/maximum flash memory8 GB/ 32 GB256 MB/ 8 GB256 MB/ 8 GB256 MB/ 8 GB256 MB/ 8 GB256 MB/ 8 GB256 MB/ 8 GB256 MB/ 8 GB256 MB/ 8 GB256 MB/ 8 GB256 MB/ 8 GB256 MB/256 MB
Default/maximum synchronous dynamic RAM (SDRAM)Data plane: 2 GB Control plane: 4 GB/16 GB1 GB/ 4 GB* 1 GB/ 4 GB* 1 GB/ 4 GB*1 GB/ 4 GB*512 MB/ 4 GB*512 MB/ 2.5 GB512 MB/ 2.5 GB512 MB/ 2.5 GB512 MB/ 2.5 GB512 MB/ 2.5 GB512 MB/512 MB
Modular LAN switchports (with optional Power over Ethernet)-98**74 **98**74 **50**50**24**1611119

Advanced Security****

Stateful FirewallYesYesYesYesYesYesYesYesYesYesYesYes
Onboard hardware VPN acceleration (Digital Encryption Standard [DES], Triple DES [3DES], and Advanced Encryption Standard [AES])YesYesYesYesYesYesYesYesYesYesYesYes
Intrusion PreventionNoYesYesYesYesYesYesYesYesYesYesYes
Content FilteringNoYesYesYesYesYesYesYesYesYesYesYes

Unified Communications

Local ConferencingYesYesYesYesYesYesYesYesYes---
Voice and Video DSP supportPVDM4PVDM3 and PVDM2PVDM3 and PVDM2PVDM3 and PVDM2PVDM3 and PVDM2PVDM3 and PVDM2PVDM3 and PVDM2PVDM3 and PVDM2PVDM3 and PVDM2---
Survivable Remote Site Telephony (SRST)Up to 1500Up to 1500Up to 1350Up to 1200Up to 730Up to 250Up to 100Up to 50Up to 35---
Cisco Unified Communications Manager ExpressPlannedUp to 450Up to 400Up to 350***Up to 250***Up to 150Up to 100Up to 50Up to 35---
Cisco Unity Express (network module [NM], service module [SM], or ISM)N/A32 ports; 300 mailboxes32 ports; 300 mailboxes32 ports; 300 mailboxes32 ports; 300 mailboxes32 ports; 300 mailboxes32 ports; 300 mailboxes32 ports; 300 mailboxes10 ports; 100 mailboxes---
Session Initiation Protocol (SIP) sessions2500250020001000800600400200100---
Digital Voice SupportUp to 720Up to 660Up to 420Up to 720Up to 480Up to 400Up to 240Up to 150Up to 100---
Maximum voice support for analog and Basic Rate Interface (BRI)PlannedForeign exchange station (FXS): 108
Foreign exchange office (FXO): 60 BRI: 38
FXS: 60
FXO: 36
BRI: 22
FXS 112, FXO 64, BRI 40FXS 64, FXO 40, BRI 24FXS 64, FXO 40, BRI 24FXS 40, FXO 28, BRI 16FXS 40, FXO 28, BRI 16FXS 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.
**** Enabled via security license for the Universal IOS image. IPS and content filtering need additional subscription licenses.