Connecting An Async Modem To The Console Port - Cisco CISCO871-K9 - 871 Integrated Services Router Hardware Installation Manual

Chapter 4 Router Cabling Procedures

Connecting an Async Modem to the Console Port

The Cisco 850 series and Cisco 870 series routers support the dial backup function, which allows a user
to connect an analog modem to the console port as a backup link to the WAN port in case the ADSL
service goes down.
To connect an analog modem to the console port, you will need an optional router modem cable. Contact
Note
your router vendor to order this cable.
Although
this connection applies to all Cisco 850 series and Cisco 870 series routers.
Figure 4-10
1
2
3
OL-5331-01
Figure 4-10 shows the async modem connection to the console port on the Cisco 857 router,
Connecting an Async Modem to the Console Port
Cisco 857W
SN: XXXNNNNXXXX
LAN ADSLoPOTS
FE0 FE1 FE2 FE3
2
3
4
Router console port
Router modem cable
Available port on an async modem
Cisco 850 Series and Cisco 870 Series Access Routers Hardware Installation Guide
1
CONSOLE
RESET
AUX +5,+12 VDC
5
1 2 3
ABC DEF
4 5 6
GHI JKL MNO
7 8 9
PQRS TUV WXYZ
0 #
*
OPER
4
Wall jack connected by an RJ-11 telephone
cable to a port on an async modem
5
Telephone connected by an RJ-11 telephone
cable to a port on an async modem (optional)
Connecting an Async Modem to the Console Port
4-13