Cisco 1900 routers are the best choice after becoming the substitute for the previous Cisco 1800 series routers. Designed to meet the application demands of today’s small branches and to evolve to cloud-based services, the Cisco 1900 series delivers virtualized applications and highly secure collaboration through the widest array of WAN connectivity at high performance that offers concurrent services at up to 25 Mbps.
The Cisco 1900 routers have primarily two series, the Cisco 1941 and Cisco 1921. With five times the performance of the Cisco 1841, the Cisco 1941 is positioned for high-performance security, Metro Ethernet, high-density switching, and integrated wireless solutions. The Cisco 1921 Series, with three times the performance of the Cisco 1841, is targeted at the broad range of broadband solutions – Serial, T1/E1, xDSL.
The Cisco 1941 ISR supports two models: the Cisco 1941 and the Cisco 1941 Wireless. The wireless version of the Cisco 1941 is delivered from Cisco with an internal module for an 802.11 a/b/g/n WLAN access point. Because the radio settings are country-and region-specific, the Cisco 1941 Wireless has part-number variants that offer these region-specific solutions.
Part numbers of Cisco 1900 Series are listed in the following table.
| Cisco 1941 Ordering SKU | Description | Technical Service SKU (SMARTnet 8x5xNBD) |
| CISCO1941W-A/K9 | Cisco 1941 Router w/ 802.11 a/b/g/n FCC Compliant WLAN ISM | CON-SNT-1941WA |
| CISCO1941W-C/K9 | Cisco 1941 Router w/ 802.11 a/b/g/n China Compliant WLAN ISM | CON-SNT-1941WC |
| CISCO1941W-E/K9 | Cisco 1941 Router w/ 802.11 a/b/g/n ETSI Compliant WLAN ISM | CON-SNT-1941WE |
| CISCO1941W-P/K9 | Cisco 1941 Router w/ 802.11 a/b/g/n Japan Compliant WLAN ISM | CON-SNT-1941WP |
| CISCO1941W-N/K9 | Cisco 1941 Router w/ 802.11 a/b/g/n Aus, NZ Compliant WLAN ISM | CON-SNT-1941WN |
| CISCO1941/K9 | Cisco 1941 w/2 GE,2 EHWIC slots,256MB CF,512MB DRAM,IP Base | CON-SNT-1941 |
| CISCO1921/K9 | CISCO 1921 Modular Router, 2 GE, 2 EHWIC slots, 256F/512D, IP Base Lic | CON-SNT-1921 |
| CISCO1921-ADSL2/K9 | Cisco 1921 ADSL2+ Bundle, HWIC-1ADSL, 256F/512D, IP Base Lic | CON-SNT-1921DSL2 |
| C1921-ADSL2-M/K9 | Cisco 1921 ADSL2 Annex M Bundle, HWIC-1ADSL-M, 256F/512D, IP Base Lic | CON-SNT-1921AD2M |
| C1921-4SHDSL/K9 | Cisco 1921 4-pair G.SHDSL Bundle, HWIC-4SHDSL, 256F/512D, IP Base Lic | CON-SNT-19214DSL |
You can order the Cisco 1941 with an AC or PoE type of power supply. The Cisco 1941 does not offer a DC version of the power supply, and it does not support an external RPS.
The Cisco 1921 ships with an integrated AC power supply by default, and you do not need to select the AC power supply. In order to power ports on a switch module in a Cisco 1921 or 1941, you must order the router with a PoE power supply. For the Cisco 1921, the PoE power supply is external to the router.
Cisco 1900 Series Router Power-Supply Options
| Cisco 1941 Ordering SKU | Description |
| PWR-1941-AC | Cisco 1941 AC Power Supply (Both system & spare) |
| PWR-1941-POE | Cisco 1941 AC Power Supply with Power Over Ethernet (Both system & spare) |
| CISCO 1921 AC Power Supply | Included by default and does not require user selection |
| PWR-1900-POE | Cisco 1905, Cisco 1921 Power Over Ethernet Power Supply |
The Cisco 1921 ISRs are offered in a fixed-memory configuration, whereas the Cisco 1941 ISRs are offered in an expandable memory configuration. Cisco 1921 ISRs support an internal 256-MB embedded USB (eUSB) flash and an internal soldered 512-MB DRAM memory. On Cisco 1941 and 1941 Wireless routers, the default DRAM of 512 MB is also soldered onto the motherboard. Memory upgrades on the Cisco 1941 are available as modular DIMMs in densities of 512 MB, 1 GB, and 2 GB.
Part Numbers for Cisco 1900 Series DRAM
| Cisco 1941 Ordering SKU | Description |
| MEM-1900-512MB-DEF | 512MB DRAM for Cisco 1941 ISR (Default) |
| MEM-1900-512U2.5GB | 512MB to 2.5GB DRAM Upgrade (2GB+512MB) for Cisco 1941 ISR |
| MEM-1900-512U1.5GB | 512MB to 1.5GB DRAM Upgrade (1GB+512MB) for Cisco 1941 ISR |
| MEM-1900-512U1GB | 512MB to 1GB DRAM Upgrade (512MB+512MB) for Cisco 1941 ISR |
| MEM-1900-2GB= | 2GB DRAM for Cisco 1941/1941W ISR (only as spare) |
| MEM-1900-1GB= | 1GB DRAM for Cisco 1941/1941W ISR (only as spare) |
| MEM-1900-512MB= | 512MB DRAM for Cisco 1941/1941W ISR (only as spare) |
| DRAM memory upgrade | None available; Fixed 512MB DRAM only |
The Compact Flash part numbers in the following Table are shared across all the routers in the Cisco ISR G2 portfolio. Compact Flash slot 0 is populated with a 256-MB Compact Flash by default from the factory. You can order an additional Compact Flash slot 1 that you can configure with another Compact Flash of desired density.
Cisco 1900 Series Routers Compact Flash
| Cisco 1941 Ordering SKU | Description |
| MEM-CF-256U4GB | 256MB to 4GB Compact Flash Upgrade for Cisco 1900, 2900, 3900 ISR |
| MEM-CF-256U2GB | 256MB to 2GB Compact Flash Upgrade for Cisco 1900, 2900, 3900 ISR |
| MEM-CF-256U1GB | 256MB to 1GB Compact Flash Upgrade for Cisco 1900, 2900, 3900 ISR |
| MEM-CF-256U512MB | 256MB to 512MB CF Upgrade for Cisco 1900, 2900, 3900 ISR |
| MEM-CF-256MB | 256MB Compact Flash for Cisco 1900, 2900, 3900 ISR (Default) |
| MEM-CF-4GB= | 4GB Compact Flash (Spare) for Cisco 1900, 2900, 3900 ISR (only as spare) |
| MEM-CF-2GB= | 2GB Compact Flash (Spare) for Cisco 1900, 2900, 3900 ISR (only as spare) |
| MEM-CF-1GB= | 1GB Compact Flash (Spare) for Cisco 1900, 2900, 3900 ISR (only as spare) |
| MEM-CF-512MB= | 512MB Compact Flash (Spare) for Cisco 1900, 2900, 3900 ISR (only as spare) |
| MEM-CF-256MB= | 256MB Compact Flash (Spare) for Cisco 1900, 2900, 3900 ISR (only as spare) |
| Flash memory upgrade | None available; Fixed internal 256MB eUSB Flash only |
You can order a spare of the fan blower on the Cisco 1941 if needed.
Cisco 1900 Series Routers Fan-Related Products
| Ordering SKU | Description |
| 1941-2901-FANBLWR= | Cisco 1941/2901 Fan Blower Assembly (only as spare) |
More Ordering Tips for Cisco ISR G2
Ordering Common Items Across Cisco 3900, 2900, and 1900 Series Routers
Each of the routers in the Cisco ISR G2 portfolio (except the Cisco 1921) ships with a default accessory kit consisting of:
- 19-inch rack-mount brackets (for the Cisco 1921, you must order the rack-mount kit because it does not ship by default)
- Regulatory & Compliance Safety Information (RCSI) guide
The default accessory kit does not include any Category 5 RJ-45 Ethernet cables or cables for the router console or auxiliary port. You can order the console and auxiliary cables as an option during router configuration or as spares. The Cisco ISR G2 routers offer an innovative USB-based console port, which needs a separate console cable.
You can order the 23-inch rack-mount brackets, the blank faceplates for module slots, and slot dividers as spares. There is a blank faceplate spare for the service-module slot (SM- BLANK-KIT=) that is unique to the Cisco 2921 and 3925 to cover the gap left behind on removal of doublewide service modules. This part number is a combination of the service-module blank attached to the service-module slot divider to create an L-shaped piece. Under normal usage with singlewide service modules, this area is covered by a blank faceplate and does not allow for insertion of any singlewide service module. Similarly, for the Cisco 1941, there is a high-speed WAN interface card (HWIC) blank faceplate spare (HWIC-BLANK-KIT=) to cover the gap left behind from the removal of doublewide HWICs. This part number is a combination of the HWIC blank attached to the HWIC slot divider to form an L-shaped piece.
Opacity shields are also available on the Cisco 1921, 2900, and 3900 ISRs that meet the Federal Information Processing Standards Publications (FIPS) 140-3 Level 2 opacity requirement. Opacity shields are not required for the Cisco 1941 because the router ships with a solid cover and the router interior is not exposed.
The following Table lists the part numbers for cables, rack-mount brackets, blank faceplates, and FIPS shields for the Cisco 3900, 2900, and 1900 Series ISRs.
Cables, Rack-Mount Brackets, Blank Faceplates, and FIPS Shields for Cisco 3900, 2900, and 1900 Series Routers
| Ordering SKU | Description |
| CAB-CONSOLE-RJ45 | Console Cable 6ft with RJ45 and DB9F (Both system and spare) |
| CAB-AUX-RJ45 | Auxiliary Cable 8ft with RJ45 and DB25M (Both system and spare) |
| CAB-CONSOLE-USB | Console Cable 6 ft with USB Type A and mini-B connectors (Both system and spare) |
| ACS-3900-RM-23= | 23 inch rack mount kit for Cisco 3925 – 3945EISR (only as spare) |
| ACS-2900-RM-23= | 23 inch rack mount kit for Cisco 2911/2921/2951 ISR (only as spare) |
| ACS-2901-RM-23= | 23 inch rack mount kit for Cisco 2901 ISR (only as spare) |
| SM-S-BLANK= | Removable faceplate for SM slot on Cisco 2900, 3900 ISR (only as spare) |
| SM-BLANK-KIT= | Blank faceplate for SM slot with divider on Cisco 2951 & 3925 (only as spare) |
| HWIC-BLANK= | Blank faceplate for HWIC/EHWIC slot on Cisco ISR (only as spare) |
| HWIC-BLANK-KIT= | Blank faceplate for HWIC slot with divider for Cisco1941 ISR (only as spare) |
| HWIC-SLOT-DIVIDER= | HWIC/EHWIC Slot Divider (Guide) for Cisco 1900, 2900, 3900 ISR (only as spare) |
| SM-SLOT-DIVIDER= | SM Slot Divider (Guide) for Cisco 2900, 3900 ISR (only as spare) |
| ACS-CF-COVER= | Compact Flash Cover (Guard) for Cisco 1900, 2900, 3900 ISR (only as spare) |
| FIPS-SHIELD-3900= | FIPS opacity shield for Cisco 3925 – 3945EISR |
| FIPS-SHIELD-2921= | FIPS opacity shield for Cisco 2921 ISR |
| FIPS-SHIELD-2951= | FIPS opacity shield for Cisco 2951 ISR |
| FIPS-SHIELD-2911= | FIPS opacity shield for Cisco 2911 ISR |
| FIPS-SHIELD-2901= | FIPS opacity shield for Cisco 2901 ISR |
| FIPS-SHIELD-1900= | FIPS opacity shield for Cisco 1905, Cisco 1921 ISR |
Cisco Configuration Professional is a device-configuration application that supports configuration of the Cisco ISR G2s. By default, the platforms ship with Cisco Configuration Professional Express installed on the Compact Flash in slot 0 (ISR-CCP-EXP). A full version of Cisco Configuration Professional is available as a free download on Cisco.com, or you can order a CD with a new ISR system. To order a full copy of the Cisco Configuration Professional software, select one of the CD option part numbers during router configuration or order it as a spare later.
Cisco Configuration Professional for Cisco 3900, 2900, and 1900 Series Routers
| Ordering SKU | Description |
| ISR-CCP-EXP | Cisco Config Pro Express on Router Flash |
| ISR-CCP-EXP-NOCONF | Cisco Config Pro Express on Router Flash w/o default config |
| ISR-CCP-CD | Cisco Config Professional on CD, CCP-Express on Router Flash (Both system and spare) |
| ISR-CCP-CD-NOCONF | Cisco Config Pro on CD, CCP-Express on CF w/o default config |
More Cisco ISR G2 Router Topics
Ordering Guide for Cisco 3900 ISR G2
Ordering Cisco 2900 Series Routers You Should Know
A Simple Reason for Selecting Cisco ISR G2 Series for Your Network
Cisco SEC-K9 License vs. HSEC-K9 License
Cisco 4451-X vs. Cisco 3945E vs. 3925E vs. Cisco 3945 vs. 3925 Router
