- The Cisco 2901 router, supporting voice module, is designed for small offices.
- . Four integrated EHWIC slots on the Cisco 2901, 2911, 2921, and 2951 allow for more flexible configurations. Each HWIC slot offers high-data-throughput capability: Up to 1.6 Gbps aggregate toward the route processor. Up to 2 Gbps aggregate to other module slots over the MGF.
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If you wanna buy a Cisco router to set up your network, maybe you are confused with the detailed functions of these models, such as Cisco 1921, Cisco 1941 and Cisco 2901. Which one would be better for your network setup? For example, if you need one that support over 10 routing protocol such as OSPF, BGP, EIGRP, PIM-SM, IGMPv3, static IPv4 routing, static IPv6 routing; an evolutionary platform with multicore CPUs, etc. the CISCO1941W-E/K9 may be not a bad choice.
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So what are the main differences between the following routers: Cisco 2901, Cisco 1941 and Cisco 1921? Here we list the main differences and features of Cisco 1921, CISCO 1941 and Cisco 2901 in the following table:
Cisco 1921, Cisco 1941 and Cisco 2901 Comparison
| CISCO 1921 | Cisco 1941/Cisco 1941W | Cisco 2901 | |
| Form Factor | 1 RU | 2 RU | 1 RU |
Integrated WAN Ports | 2 Gigabit Ethernet | 2 Gigabit Ethernet | 2 Gigabit Ethernet |
Interface slots (enhanced high-speed WAN interface card [EHWIC]) | 2 | 2 | |
Interface Slots, Network Interface Modules | N/A | N/A | N/A |
| Service-module slots | 0 | 0 | 0 |
Integrated services module (ISM) slots | 0 | 1 | 1 |
| Packet-voice width='104'>0 | 0 | 2 | |
USB Ports (v2.0) | 1 | 2 | 2 |
Default/maximum flash memory | 256 MB/256 MB | 256 MB/ 8 GB | 256 MB/ 8 GB |
Default/maximum synchronous dynamic RAM (SDRAM) | 512 MB/512 MB | 512 MB/ 2.5 GB | 512 MB/ 2.5 GB |
Modular LAN switchports (with optional Power over Ethernet) | 9 | 11 | 16 |
Stateful Firewall | YES | YES | YES |
Voice and Video DSP support | – | – | PVDM3 and PVDM2 |
Survivable Remote Site Telephony (SRST) | – | – | Up to 35 |
Cisco Unity Express (network module [NM], service module [SM], or ISM) | – | – | 10 ports; 100 mailboxes |
Digital Voice Support | – | – | Up to 100 |
If you want to know the more detailed Cisco 1900 router models you can visit the page: https://www.router-switch.com/Price-cisco-routers-cisco-router-1900-series_c16
More Cisco 1900 Series Comparison:
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PVDM2-ADPTR PVDM2 Adapter for PVDM Slot on Cisco 2900, 3900 Series ISR PVDM3-16 16-channel high-density voice and video DSP module PVDM3-32 32-channel high-density voice and video DSP module PVDM3-64 64-channel high-density voice and video DSP module PVDM3-128 128-channel high-density voice and video DSP module PVDM3-192 192-channel high-density voice and video DSP module PVDM3-256 256-channel high-density voice and video DSP modul PVDM2-8 8-Channel Packet Voice/Fax DSP Module PVDM2-16 16-Channel Packet Voice/Fax DSP Module PVDM2-32 32-Channel Packet Voice/Fax DSP Module PVDM2-48 48-Channel Packet Voice/Fax DSP Module PVDM2-64 64-Channel Packet Voice/Fax DSP Module PVDM2-12DM 12 Port Digital Modem Module PVDM2-24DM 24 Port Digital Modem Module PVDM2-36DM 36 Port Digital Modem Module