Cisco routers have come a long way. In today’s market, you have a few choices between the router that can suite your needs. The 1900 series, 2900 series and the 3900 series. Likewise to Cisco switches, the higher you move up on the model series, the more it will do for you.
Cisco 1900 Series
The 1900 series router is the base line for the 1900 series routers. It comes equipped with 2 Gigabit integrated WAN ports, 2 enhanced High-Speed WAN interface card (EHWIC) slots that can host 2 single wide or 1 double wide EHWIC module, 1 USB port, a default maximum flash memory of 256 MB, 512MB of DDR2 DRAM, POE (External) only on AC models. If you want a little more power, then you may want to look into the Cisco 1941 series. It has the same 2 WAN ports, but it comes with an integrated service module slot, also has a larger max flash memory that supports up to 8 GB. You can also increase the DRAM to 2.5 GB over the stock 512 MB that comes standard.
Cisco 2900 Series
The 2900 series routers come in 4 different models. The 2901 will still have same 2 WAN ports but as 2 more EHWIC slots bringing it to a total of 4 slots. It comes with 1 integrated service module slot, 2 Packet-Voice data-module (PVDM) slots with a default 256 BM of flash memory and can be expanded up to 8 GB.
The 2911 series is the next step up in the 2900 collection. Over the 2901, it has 3 integrated WAN ports. 4 slots for EHWIC, 1 service module slot, 2 PVDM slots with the same default flash memory. It also can be expanded up to 8 GB. The DRAM is 512BM and can be expanded p to 2.5 GB.
The 2921 series also has 3 intergraded WAN slots along with 1 SFP slot. Equipped with 4 EHWIC slots with 1 service slot and 3 PVDM slots. It has the same amount of flash memory and DRAM as the 2911 series.
The last model of the 2900 series is the 2951. It comes with the 3 intergraded WAN ports with 1 SFP port. 4 EHWIC slots, 2 service module slots, 3 PVDM slots, and 1 ISM slot. The same flash memory as the other routers in the series but the DRAM can be expanded from 512MB to 4GB in total.
Cisco 3900 Series
The 3900 series routers come in 4 different models. The 3925 will come with 3 intergraded WAN ports and 2 SFP ports. 4 EHWIC slots, 2 service module slots, 1 ISM slot and 4 PVDM slots. It comes with the same default amount of flash memory of 256 MB, but has 1GB of DRAM expandable to 4GB
The 3945 router comes with 3 Integrated WAN ports with 2 SFP ports, 4 EHWIC slots, 4 Service module slots, 1 ISM slot, 4 PVDM slots and the same amount of flash memory and DRAM as its counterpart the 3925.
The 3925 and the 3945 also come in E versions. The E versions come fully integrated with POE with a total of 4 Integrated WAN ports and 2 SFP ports. While they come with 1 less PVDM slot compared to their normal versions, they still have the same amount of DRAM and flash memory.
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