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Cisco 850 Series and Cisco 870 Series Access Routers Hardware Installation Guide
OL-5331-01
Chapter 1 Product Overview
General Descriptions of the Router Models
Router Ports on the Cisco 851 and Cisco 871 Back Panel
The Cisco 851 and Cisco 871 routers have the following ports on the back panel:
•
Four 10/100BASE-T RJ-45 Fast Ethernet LAN ports with a built-in switch
•
One 10/100BASE-T RJ-45 WAN Fast Ethernet port
•
One RJ-45 console port
•
Two USB ports (on the Cisco 871 router only)
USB Port Power Allocation on the Cisco 871 Router
The power available for each of the two USB ports is 500 mA. Power is dynamically allocated to each
port as needed, up to 500 mA.
Cisco 857 and Cisco 877 ADSL-over-POTS Routers
The Cisco 857 and Cisco 877 routers are asymmetric digital subscriber line (ADSL)-over-plain old
telephone service (POTS) routing devices. The routers have an integrated
4-port Ethernet switch for the
LAN and an ADSL physical interface for the WAN, allowing the routers to connect a corporate
telecommuter or small office to corporate LANs and the Internet.
The front panels of the Cisco 857 and Cisco 877 routers are identical. (See
Figure 1-4
.) The back panels
of these two routers are similar except for their model numbers, which differ.
Figure 1-5
shows the back
panel of a Cisco 857 router, and
Figure 1-6
shows the back panel of a Cisco 877 router.
Figure 1-4
Cisco 857 and Cisco 877 Router Front Panel
OK
CD
PPP
VPN
OK
DATA
WLAN
RXD
ADSL
TXD
CISCO 800 SERIES
ETHERNET LAN
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