Cisco 877W Hardware Installation Guide - Page 57

Chapter 4 Router Cabling Procedures Connecting an Async Modem to the Console Port 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. Note To connect an analog modem to the console port, you will need an optional router modem cable. Contact your router vendor to order this cable. Although Figure 4-10 shows the async modem connection to the console port on the Cisco 857 router, this connection applies to all Cisco 850 series and Cisco 870 series routers. Figure 4-10 Connecting an Async Modem to the Console Port SN: XXXNNNNXXXX LAN FE0 FE1 FE2 FE3 1 Cisco 857W ADSLoPOTS RESET CONSOLE AUX +5,+12 VDC 2 3 4 5 123 ABC DEF 456 GHI JKL MNO 789 PQRS TUV WXYZ * 0 OPER # 127049 OL-5331-01 1 Router console port 2 Router modem cable 3 Available port on an async modem 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) Cisco 850 Series and Cisco 870 Series Access Routers Hardware Installation Guide 4-13