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Cisco 800 Series Routers Hardware Installation Guide
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Chapter 2 Installation
Installing Your Router
Connecting an ISDN Line to Cisco 802 and Cisco 804 Routers
To connect an ISDN line to Cisco 802 and Cisco 804 routers, follow the steps in Figure 2-5.
Warning
Network hazardous voltages are present in the ISDN cable. If you detach the ISDN cable, detach the
end away from the router first to avoid possible electric shock. Network hazardous voltages also are
present on the system card in the area of the ISDN port (RJ-45 connector), regardless of when power
is turned to standby.
Warning
Do not work on the system or connect or disconnect cables during periods of lightning activity.
Warning
To reduce the risk of fire, use only No. 26 AWG or larger telecommunications line cord.
Caution Always connect the red cable to the red ISDN U port on the router. Do not connect the cable to a yellow
Ethernet port. This will damage your router.
Caution The Cisco 800 series routers do not support the Australian IUT requirement, which specifies that the
routers must communicate for 1/2 hour after a power failure. If a power failure occurs, a Cisco 800 series
router stops communicating with other devices.