Cisco 870 Series of integrated services routers are fixed-configuration routers that support multiple types of DSL technologies, broadband cable, and Metro Ethernet connections in small offices (Figures 1 and 2). They provide the performance needed to run concurrent services, including firewall, intrusion prevention, and encryption for VPNs; optional 802.11b/g for WLAN networking; and quality of service (QoS) features for optimizing voice and video applications. In addition, the Cisco Router and Security Device Manager (SDM) Web-based configuration tool simplifies setup and deployment (Figure 3), and centralized management capabilities give network managers visibility and control of the network configurations at the remote site.

CISCO871-K9 data sheet
Product Description     Cisco 871 Integrated Services Router – router
Manufacturer     Cisco Systems, Inc
Manufacturer Part Number     CISCO871-K9
Product Type     Router + 4-port switch (integrated)
Form Factor     External
Dimensions (WxDxH)     26 cm x 21.6 cm x 5.1 cm
Weight     0.95 kg
DRAM Memory     128 MB (installed) / 256 MB (max)
Flash Memory     24 MB (installed) / 52 MB (max)
Routing Protocol     RIP-1, RIP-2, HSRP, VRRP, GRE, policy-based routing (PBR)
Data Link Protocol     Ethernet, Fast Ethernet
Network / Transport Protocol     PPTP, L2TP, IPSec, PPPoE
Remote Management Protocol     Telnet, SNMP 3, HTTP, HTTPS
Features     Cisco IOS Advanced Security , firewall protection, DMZ port, auto-sensing per device, DHCP support, NAT support, hardware encryption, VPN support, PAT support, auto-negotiation, VLAN support, auto-uplink (auto MDI/MDI-X), traffic shaping, Stateful Packet Inspection (SPI), dynamic DNS server, VPN passthrough, Low-latency queuing (LLQ), Class-Based Weighted Fair Queuing (CBWFQ), Weighted Fair Queuing (WFQ), Access Control List (ACL) support, Quality of Service (QoS), DHCP server
Compliant Standards     IEEE 802.1D, IEEE 802.1x, USB 2.0
Power     AC 120/230 V ( 50/60 Hz )