Specifications

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Cisco 7100 Series VPN Router Installation and Configuration Guide
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Chapter 3 Installing a Cisco 7100 VPN Series Router
Connecting to the Network
Figure 3-12 Connecting the E3 WAN Serial Ports on the Cisco 7120-E3
You can test the DTE-to-DCE cable connection by using the loopback command.
Note For more information, see the “Cisco 7120-T3, Cisco 7120-E3, Cisco 7140-2T3, and Cisco 7140-2E3
Cables” section on page C-18.
Connecting the Cisco 7120-AT3, Cisco 7120-AE3, Cisco 7140-2AT3, and
Cisco 7140-2AE3
Use a 75-ohm coaxial cable to connect your router to an ATM T3 or E3 network. The cables conform to
EIA/TIA-612 and EIA/TIA-613 specifications. The ATM T3 or E3 ports on the router are considered
DTE devices.
The Cisco 7120 series ATM models have the following port configurations:
• Cisco 7120-AT3—One ATM T3 port
• Cisco 7120-AE3—One ATM E3 port
• Cisco 7140-2AT3—Two ATM T3 ports
• Cisco 7140-2AE3—Two ATM E3 ports
AT3 or AE3 ports consist of two connectors, transmit and receive. The 75-ohm coaxial cable (Cisco
product number CAB-ATM-DS3/E3) is available only from Cisco Systems; it is not available from
outside commercial cable vendors.
The Cisco 75-ohm coaxial cable is available only in 10-foot (3.05-meter) lengths. The typical maximum
distance between stations for T3 and E3 transmissions is 1300 feet (396 meters).
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