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  Cisco Router Portfolio
Features 850 870 1800 (fixed) 1841 (modular) 2801 2811 2821 2851 3825 3845
Form Factor Desktop Desktop Desktop Desktop 1 RU 1 RU 2 RU 2 RU 2 RU 3 RU
Integrated Routed/WAN Ethernet 1 10/100 WAN (851) 1 10/100 WAN (871) 1 10/100 (1801-1803), 2 10/100 (1811, 1812) 2 10/100 2 10/100 2 10/100 2 10/100/1000 2 10/100/1000 2 10/100/1000 2 10/100/1000
10/100 Ethernet Switch Ports 4 4 8 Up to 4 Up to 16 Up to 32 Up to 40 Up to 64 Up to 88 Up to 112
WAN Support ADSL Annex A (857) ADSL Annex B (876), ADSL Annex A (877), G.SHDSL (878) ADSL Annex A (1801), ADSL Annex B (1802), G.SHDSL (1803) ADSL and G.SHDSL WICs (optional) ADSL and G.SHDSL WICs (optional) ADSL and G.SHDSL WICs (optional) ADSL and G.SHDSL WICs (optional) ADSL and G.SHDSL WICs (optional) ADSL and G.SHDSL WICs (optional) ADSL and G.SHDSL WICs (optional)
ISDN Ports -- 1 BRI (876), 1 BRI (878 Out of Band Management Only) 1 BRI (1801, 1802, 1803, 1812) BRI WIC (optional) BRI WIC (optional) BRI or PRI (optional) BRI or PRI (optional) BRI or PRI (optional) BRI or PRI (optional) BRI or PRI (optional)
Analog Modem Ports -- -- 1 (1811) WIC (optional) WIC (optional) WIC or Network Module (optional) WIC or Network Module (optional) WIC or Network Module (optional) WIC or Network Module (optional) WIC or Network Module (optional)
Interface Card Slots -- -- -- 2 HWIC/WIC/VWIC(data only) 2 HWIC/WIC/VIC/VWIC,1 WIC/VIC/VWIC,1 VIC/VWIC 4 HWIC/WIC/VIC/VWIC 4 HWIC/WIC/VIC/VWIC 4 HWIC/WIC/VIC/VWIC 4 HWIC/WIC/VIC/VWIC 4 HWIC/WIC/VIC/VWIC
Network Module Slots -- -- -- -- -- 1 1 1 2 4
AIM Slots -- -- -- 1 2 2 2 2 2 2
USB Ports -- 2 (v2.0) (871 only) 2 (v2.0) (1811 and 1812 only) 1 (v1.1) 1 (v1.1) 2 (v1.1) 2 (v1.1) 2 (v1.1) 2 (v1.1) 2 (v1.1)
PoE Support Yes, Optional External Adapter Yes, Optional External Adapter Optional -- Optional Optional Optional Optional Optional Optional
Embedded CryptoProcessor Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Default/Max Flash 20 MB 24/52 MB 32/128 MB 32/128 MB 32/128 MB 64/256 MB 64/256 MB 64/256 MB 64/256 MB 64/256 MB
Default/Max SDRAM 64 MB 128/256 MB 128/384 MB 128/384 MB 128/384 MB 256/760 MB 256/1024 MB 256/1024 MB 256/1024 MB 256/1024 MB
Gigabit Ethernet, SFP Port -- -- -- -- -- Optional (HWIC) Optional (HWIC) Optional (HWIC) 1 1
Cisco Router and Security Device Manager (SDM) Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Advanced Security  
VPN Yes Yes Yes Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image
Maximum VPN Tunnels Up to 10 Up to 20 Up to 50 Up to 800 Up to 1500 Up to 1500 Up to 1500 Up to 1500 Up to 2000 Up to 2500
Network Admission Control (NAC) -- Yes Yes Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image
URL Filtering -- Yes Yes Yes, IOS-based Yes, IOS-based Yes, IOS- and NM-CE-based Yes, IOS- and NM-CE-based Yes, IOS- and NM-CE-based Yes, IOS- and NM-CE-based Yes, IOS- and NM-CE-based
Stateful Firewall Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Inline Intrusion Prevention System (IPS) -- Yes Yes Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image Yes, requires Cisco IOS Security Image
Voice Support  
DSP (PVDM) Slots on Motherboard -- -- -- -- 2 2 3 3 4 4
Survivable Remote Site Telephony (SRST) -- -- -- -- Yes, up to 24 users Yes, up to 36 users Yes, up to 48 users Yes, up to 96 users Yes, up to 336 users Yes, up to 720 users
Cisco CallManager Express (CME) -- -- -- -- Yes, up to 24 users Yes, up to 36 users Yes, up to 48 users Yes, up to 96 users Yes, up to 168 users Yes, up to 240 users
Cisco Unity™ Express -- -- -- -- Yes, up to 50 mailboxes Yes, up to 120 mailboxes Yes, up to 120 mailboxes Yes, up to 120 mailboxes Yes, up to 120 mailboxes Yes, up to 120 mailboxes
Digital Voice -- -- -- -- Yes, up to 30 calls Yes, up to 80 calls Yes, up to 128 calls Yes, up to 192 calls Yes, up to 480 calls Yes, up to 480 calls
Analog Voice -- -- -- -- Yes, up to 16 FXS,16 FXO ports Yes, up to 28 FXS,24 FXO ports Yes, up to 52 FXS,36 FXO ports Yes, up to 52 FXS,36 FXO ports Yes, up to 52 FXS,36 FXO ports Yes, up to 52 FXS,36 FXO ports
Local Conferencing and Transcoding -- -- -- -- Yes, use PVDMs Yes, use PVDMs Yes, use PVDMs Yes, use PVDMs Yes, use PVDMs Yes, use PVDMs
Wireless  
Integrated 802.11 b/g Access Point(2.4 GHz; 54 Mb/s) Yes
850W
Yes
8750W
Yes
1800W
HWIC (Optional) HWIC (Optional) HWIC (Optional) HWIC (Optional) HWIC (Optional) HWIC (Optional) HWIC (Optional)
Integrated 802.11 a/b/g Access Point(simultaneous 2.4 and 5GHz; 2x54 Mb/s) -- -- Yes
1800W
HWIC (Optional) HWIC (Optional) HWIC (Optional) HWIC (Optional) HWIC (Optional) HWIC (Optional) HWIC (Optional)
RP-TNC connectors for field-replaceable optional high-gain antennas -- Yes Yes Yes Yes Yes Yes Yes Yes Yes
Diversity (dual) antennas -- Yes Yes Yes Yes Yes Yes Yes Yes Yes