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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
The procedure to connect an ISDN line depends on the router and in some cases your location. The
following sections describe the following procedures:
• Connecting an ISDN Line to Cisco 801 and Cisco 803 Routers
• Connecting an ISDN Line to Cisco 802 and Cisco 804 Routers
Connecting an ISDN Line to Cisco 801 and Cisco 803 Routers
Outside of North America, you might need to provide an external NT1 device and the ISDN U cable that
connects the NT1 to the ISDN wall jack. Contact your telephone service provider to supply the following
information:
• Whether you must supply an external NT1 and the ISDN U cable.
• If necessary, the names of NT1 vendors.
In North America, you must provide an external NT1 and the ISDN U cable that connects the NT1 to the
ISDN wall jack. Contact your telephone service provider for a list of NT1 vendors.
To connect an ISDN line to a Cisco 801 or Cisco 803 router without an external NT1, follow the steps
in Figure 2-3 on page 2-11.
To connect an ISDN line to a Cisco 801 or Cisco 803 router with an external NT1, follow the steps in
Figure 2-4 on page 2-11.
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 orange cable to the orange ISDN S/T 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.