The Cisco 1921 is the smaller of the two Cisco 1900 Series routers and builds on the Cisco 1841. Its two onboard RJ-45 ports are 10/100/1000 Gigabit Ethernet and work as routed LAN or WAN ports. The case is one rack unit tall, mounts on a wall, and takes an optional 19-inch rack-mount kit. Base models are CISCO1921/K9 with the IP Base license, CISCO1921-SEC/K9 with the Security feature license, and CISCO1921DC/K9 with DC power. Cisco also sells bundles with DSL, T1 and 4G LTE cards.
Memory and flash are fixed. The 1921 has 512 MB of DDR2 DRAM and 256 MB of internal USB flash, and neither can be upgraded. It has no ISM slot. Two EHWIC slots take either two single-wide EHWIC or HWIC cards or one double-wide HWIC-D. They accept HWICs, WICs and VWICs. The router supports the existing single-wide EtherSwitch HWIC and the double-wide HWIC-D, and it takes one EHWIC-1GE-SFP-CU. Most modules from earlier routers such as the 1841 are supported. One USB 2.0 port, a mini-USB console port, an RJ-45 console port and an auxiliary port complete the back panel.
The AC supply is internal. An external PoE adapter, PWR-1900-POE, powers switch module ports, and it is available on AC models only. The DC model accepts 32 to 60 VDC. There is no redundant power option. One Cisco IOS Universal image carries every feature set, with IP Base active by default. The Data license and the Security license (SEC, or SEC-NPE without payload encryption) switch on more. The 1921 handles concurrent services on WAN links up to 15 Mbps, and EHWIC-1GE-SFP-CU needs Cisco IOS Software release 15.1(4)M or later. The larger Cisco 1941, the Cisco 1841 and the Cisco 2911 each have a page, and the wider range is under networking.
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Cisco 1921 parts we supply
Routers and bundles (12)
- CISCO1921/K9: Cisco 1921, 2 onboard GE, 2 EHWIC slots, 256 MB USB flash, 512 MB DRAM, IP Base
- CISCO1921-SEC/K9: Cisco 1921 with the SEC feature license
- CISCO1921DC/K9: Cisco 1921 with DC power, 2 GE, 2 EHWIC slots, IP Base
- C1921-AX/K9: Cisco 1921, IP Base, SEC and AX licenses
- C1921-4G-V-SEC/K9: Cisco 1921 with 4G LTE (700 MHz, B13) for Verizon networks, with security
- Cisco1921-T1SEC/K9: Cisco 1921 SEC bundle with HWIC-1DSU-T1
- C1921-VA/K9: Cisco 1921 with EHWIC-VA-DSL-A
- C1921VAM/K9: Cisco 1921 with a multimode EHWIC for VDSL or ADSL2+ Annex M
- C1921-4SHDSL-EA/K9: Cisco 1921 with the double-wide EHWIC-4SHDSL-EA, IP Base
- CISCO1921-ADSL2/K9: Cisco 1921 ADSL2+ bundle with HWIC-1ADSL
- C1921-ADSL2-M/K9: Cisco 1921 ADSL2 Annex M bundle with HWIC-1ADSL-M
- C1921-4SHDSL/K9: Cisco 1921 4-pair G.SHDSL bundle with HWIC-4SHDSL
Interface cards (7)
- EHWIC-1GE-SFP-CU: 1-port dual-mode SFP or copper Gigabit Ethernet EHWIC
- HWIC-1DSU-T1: 1-port T1 CSU/DSU HWIC
- HWIC-1ADSL: 1-port ADSL HWIC
- HWIC-1ADSL-M: 1-port ADSL Annex M HWIC
- HWIC-4SHDSL: 4-pair G.SHDSL HWIC
- EHWIC-VA-DSL-A: VDSL2 and ADSL2+ EHWIC, Annex A
- EHWIC-4SHDSL-EA: 4-pair G.SHDSL EHWIC, double-wide
Power (1)
- PWR-1900-POE: External PoE power adapter for the Cisco 1905 and 1921
Software licenses (4)
- SL-19-IPB-K9: IP Base license for the Cisco 1941 and 1921
- SL-19-DATA-K9: Data license for the Cisco 1941 and 1921
- SL-19-SEC-K9: Security license for the Cisco 1941 and 1921
- SL-19-SECNPE-K9: Security No Payload Encryption license for the Cisco 1941 and 1921