The Cisco 1841 is the modular router of the Cisco 1800 Series, made for small and medium-sized businesses and small enterprise branch offices. It has two onboard 10/100 Ethernet ports, one USB 1.1 port, and console and auxiliary ports that each run up to 115.2 kbps. The chassis is a one-rack-unit desktop case that mounts on a wall but not in a rack. The power supply is internal, takes 100 to 240 VAC, and has no redundant or DC version.
Two HWIC slots hold every interface card. Both slots accept WICs, and they accept multiflex trunk VWICs for data use only. The 1841 does not carry voice: it passes VoIP through, has no PVDM slots and has no analog or digital voice support. The 4-port HWIC-4ESW Ethernet switch card is supported. One internal AIM slot takes the AIM-VPN/BPII-PLUS module, which delivers two to three times the performance of the embedded encryption, with DES, 3DES, AES and compression. That onboard encryption is switched on by a Cisco IOS security image.
Memory is SDRAM in a DIMM, 128 MB as shipped and 384 MB at most. Flash is external compact flash, 32 MB as shipped and 128 MB at most. The 1841 first ran Cisco IOS Software release 12.3(8)T, and IP Base is the default image. Other images are Broadband, Enterprise Base, Enterprise Services and SP Services.
Check card versions before ordering. The 1841 does not take WIC-1DSU-T1, WIC-1B-S/T, WIC-1B-U, WIC-1ENET or WIC-4ESW. Use WIC-1DSU-T1-V2, WIC-1B-S/T-V3, WIC-1B-U-V2 and a 4-port HWIC for those jobs, and use AIM-VPN/BPII-PLUS in place of MOD1700-VPN. Related routers have pages of their own: the Cisco 1921, the Cisco 1941 and the Cisco 2911. Other gear sits under networking, and the store has more Cisco routers and Cisco interface cards.
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Cisco 1841 parts we supply
Ethernet switching HWIC (1)
- HWIC-4ESW: 4-port single-wide 10/100 Ethernet switch HWIC
Serial WICs (3)
- WIC-1T: 1-port serial WIC
- WIC-2T: 2-port serial WIC
- WIC-2A/S: 2-port asynchronous or synchronous serial WIC
CSU/DSU WICs (2)
- WIC-1DSU-T1-V2: 1-port T1 or fractional-T1 CSU/DSU WIC
- WIC-1DSU-56K4: 1-port 4-wire 56 or 64 kbps CSU/DSU WIC
ISDN BRI WICs (2)
- WIC-1B-U-V2: 1-port ISDN BRI WIC with integrated NT1 (U interface)
- WIC-1B-S/T-V3: 1-port ISDN BRI WIC, S/T interface
DSL WICs (5)
- WIC-1ADSL: 1-port ADSL over basic telephone service WIC
- WIC-1ADSL-DG: 1-port ADSL over basic telephone service WIC with dying gasp
- WIC-1ADSL-I-DG: 1-port ADSL over ISDN WIC with dying gasp
- WIC-1SHDSL: 1-port G.shdsl WIC, two-wire
- WIC-1SHDSL-V2: 1-port G.shdsl WIC, two or four-wire
Analog modem WICs (2)
- WIC-1AM: 1-port analog modem WIC
- WIC-2AM: 2-port analog modem WIC
T1, E1 and G.703 VWICs (data only) (8)
- VWIC-1MFT-T1: 1-port RJ-48 multiflex trunk, T1
- VWIC-2MFT-T1: 2-port RJ-48 multiflex trunk, T1
- VWIC-2MFT-T1-DI: 2-port RJ-48 multiflex trunk, T1 with drop and insert
- VWIC-1MFT-E1: 1-port RJ-48 multiflex trunk, E1
- VWIC-2MFT-E1: 2-port RJ-48 multiflex trunk, E1
- VWIC-2MFT-E1-DI: 2-port RJ-48 multiflex trunk, E1 with drop and insert
- VWIC-1MFT-G703: 1-port RJ-48 multiflex trunk, G.703
- VWIC-2MFT-G703: 2-port RJ-48 multiflex trunk, G.703
VPN encryption module (1)
- AIM-VPN/BPII-PLUS: Enhanced-performance DES, 3DES, AES and compression VPN encryption AIM