4451-X |
3945E | 3925E | 3945 | 3925 | 2951 | 2921 | 2911 | 2901 | 1941 /1941W | 1921 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Form Factor | 2 rack units (RU) | 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 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 Ethernet | 2 Gigabit Ethernet | 2 Gigabit Ethernet | 2 Gigabit Ethernet |
| Interface slots (enhanced high-speed WAN interface card [EHWIC]) | N/A | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 2 | 2 |
| Interface Slots, Network Interface Modules | 3 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Service-module slots | 2 | 4 | 2 | 4 | 2 | 2 | 1 | 1 | 0 | 0 | 0 |
| Integrated services module (ISM) slots | NA | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 |
| Packet-voice data-module (PVDM) slots | 1 (ISC slot can host PVDM4) | 3 | 3 | 4 | 4 | 3 | 3 | 2 | 2 | 0 | 0 |
| USB Ports (v2.0) | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 |
| Default/maximum flash memory | 8 GB/ 32 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/ 8 GB | 256 MB/256 MB |
| Default/maximum synchronous dynamic RAM (SDRAM) | Data plane: 2 GB Control plane: 4 GB/16 GB | 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 | 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 | Yes |
| Intrusion Prevention | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Content Filtering | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Unified Communications | |||||||||||
| Local Conferencing | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | - | - |
| Voice and Video DSP support | PVDM4 | 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 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 | Planned | 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) | N/A | 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 | 2500 | 2000 | 1000 | 800 | 600 | 400 | 200 | 100 | - | - |
| Digital Voice Support | Up to 720 | 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) | Planned | 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 | - | - |
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