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Cisco 800 Series Routers Hardware Installation Guide
78-5373-04
Chapter 2 Installation
Installing Your Router
To connect a digital telephone, follow the steps in Figure 2-7. You must provide the following
equipment:
• NT1 with two S/T interfaces and one U interface.
• Telephone cable to connect digital telephone. (This cable is usually provided with the telephone.)
• ISDN U cable that connects the NT1 to the ISDN wall jack.
Figure 2-7 Connecting Digital Telephone to Cisco 801 and Cisco 803 Routers
Connecting an Analog Telephone, Fax, or Modem
If you have Cisco 803 or Cisco 804 routers, you can connect two devices, such as an analog touch-tone
telephone, fax machine, or modem. Each device is connected to basic telephone services through the
ISDN line.
To connect an analog telephone, fax machine, or modem, follow the steps in Figure 2-8. You must
provide the telephone cable to connect each device. The telephone cable is usually provided with the
device.
The gray PHONE 1 and PHONE 2 ports are RJ-11 connectors. If you are outside of North America, you
must buy and attach adapters that allow your telephones, faxes, or modems to be connected to these
RJ-11 connectors. In some countries, these adapters need additional electronics to convert the
14817
1. Connect orange cable
to orange ISDN S/T port.
Cisco 803 router
2. Connect other
end of cable
to NT1.
4. Connect ISDN U
cable to NT1.
3. Connect telephone
cable to digital
telephone.
NT1
Digital telephone
ISDN wall jack
5. Connect other end of
cable to ISDN wall jack.
6. Connect NT1
power cord to
electrical outlet.
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/T
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1
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ETHERNET 10 BASE T
HUB
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Cisco 803
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1
2
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