Cisco 2901 Memory Slots

Cisco 2901 Router Sec/K9 (Includes Base and Security License) This is a great option for a G2 series router that will conserve rack space and provide voice expansion options. This router includes the permanent security license as well as permanent the base license.
Cisco 2901 Router
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.
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

Flash Memory: 256 MB form factor: Rack-mountable; Wall Mountable height: 1.8 in. Input Voltage: 110 V AC; 220 V AC manufacturer: Cisco Systems, Inc Memory Card Supported: CompactFlash Memory Technology: DRAM model: 2901 Network Technology: 10/100/1000Base-T Number of Total Expansion Slots. Free Spins: Available after deposit bonus is redeemed/lost, Memory Slot For Cisco 2901 credited as £2 bonus. MONOPOLY Memory Slot For Cisco 2901 Live only. 1x wagering and Max bonus bet of £5 applies to winnings, 7 days to accept & 7 days to complete wagering, maximum withdrawal from winnings is. Used - Very Good: Cisco 2911 Integrated Services Router with 3 Onboard GE, 4 EHWIC Slots, 2 DSP Slots, 1 ISM Slot, 256MB CF Default, 512MB DRAM Default, IP Base (CISCO2911/K9) $ 79.00.
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 | 4 |
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 |
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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: