Cisco Systems Cisco 831 Manuale Utente

The Cisco 831 router and Cisco SOHO 91 Ethernet-to-Ethernet routers can 
connect a corporate telecommuter or small office to an Internet service provider 
(ISP) over a broadband or Ethernet connection to the following sites:

Corporate LANs

The Internet

The Cisco 831 and SOHO 91 routers are switch-capable routers that provide a 
4-port Ethernet switch for the LAN. The routers are capable of bridging and 
multiprotocol routing between LAN and WAN ports. 

Cisco 831 and SOHO 91 routers support high-speed encryption, 10/100-Mbps 
switching, and dial backup functionality via the auxiliary console port. The 
autosensing function in the routers eliminates the need for a crossover cable and 
allows the routers to detect the medium dependent interface in normal mode 
(MDI) or medium dependent interface in crossover mode (MDIX) in any other 
PC/hub with a straight-through cable or crossover cable. 

The dial backup function allows the user to connect an analog modem to the 
console port as a backup link to the WAN in case the ADSL service goes down. 
These features give the Cisco 831 and SOHO 91 routers a high level of 
performance and security. 

The Cisco 831 router is designed with hardware-based encryption, while the 
Cisco SOHO 91 supports software-based encryption. The Cisco 831 router 
supports the ability to add Flash memory or SDRAM, either as a factory upgrade 
or a field-installed option. The SOHO 91 router has a fixed memory configuration.