System information

ISR Overview and Providing Secure Administrative Access 83
Cisco 1800 Series
The Cisco 1800 series of ISRs is designed for small businesses and smaller enterprise
branch offices. These routers are designed for connectivity via cable modem/DSL, Metro
Ethernet, and wireless technologies. Table 3-4 contrasts some of the features available in
the Cisco 1800 and 1841 series of ISRs.
Feature Cisco 850 Series Cisco 870 Series
Maximum number of
VPN tunnels
10 20
Stateful firewall
support
Yes Yes
Intrusion Prevention
System (IPS) support
No Yes
Table 3-4 Cisco 1800 Series of ISRs
Feature
Cisco 1800 Series (Fixed
Interface)
Cisco 1841 Series
(Modular)
WAN technology
support
ADSL Annex A (Cisco
1801), ADSL Annex B
(Cisco 1802), G.SHDSL
(Cisco 1803)
ADSL and optional
G.SHDSL WICs
Built-in routed/WAN
Ethernet
One 10/100 (Cisco 1801-
1803)
Two 10/100 (Cisco 1811,
1812)
Two 10/100
Integrated
cryptographic
hardware
Yes Yes
Maximum flash
memory
128 MB 128 MB
Maximum SRAM
384 MB 384 MB
Support for Cisco
Security Device
Manager (SDM)
Yes Yes
Maximum number of
VPN tunnels
50 800
Stateful firewall
support
Yes Yes
Intrusion Prevention
System (IPS) support
Yes Yes
Table 3-3 Cisco 800 Series of ISRs (Continued)