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Solution:

In order to make a connection work between the two Netopia routers, a few configurations need to be applied. In this technote, we label the routers to be configured as Router A and Router B. The IP information in this technote is used as an example. You may use the IP numbering scheme we present or you may use one of your own making.

Configuring Router A - Base (gateway)

From the Main Menu, select Quick Menus -> Add Connection Profile.
Enter a Profile Name of your choice.
For Data Link Encapsulation select RFC 1483.
IP Enabled should be set to Yes, then select IP Profile Parameters.
Set Address Translation Enabled to No (tab to change the value).
Set IP Addressing to Unnumbered.
Set the Remote IP Address to 192.168.2.10 and the Remote IP Mask to 255.255.255.0.
Unless you want to enable a filter set to filter traffic between your two networks, you should have no Filter Sets enabled. If so, select Remove Filter Set to disable all filter sets from the Connection Profile.
Escape once and select Add Profile Now.
Escape once again to Quick Menu.
Select IP Setup.
Set the Ethernet IP Address to 192.168.1.1 (192.168.200.10) and the Ethernet Subnet Mask to 255.255.255.0.
Set the Default IP Gateway to 192.168.2.10.
Finally, if you want your router to be a DHCP server for your local LAN, select IP Address Serving, and configure. If you do not want your router to be a DHCP server for your local LAN, select IP Address Serving, and set IP Address Serving Mode to Disabled. You will then need to manually configure each of your workstations with an IP address on the 192.168.1.x network, and a gateway of 192.168.1.1.
Escape twice to Quick Menu once again, and select Line Configuration -> WAN
Module 1 Setup, and set Clock Source to Internal.
For Data Rate, select the highest available clock rate based on the distance between the two routers. (See the speed vs. distance table below to see the maximum supported speeds based on distance between the two routers.)
Escape to the Main Menu, select Utilities & Diagnostics -> Restart System.

Configuring Router B - CPE (client)

From the Main Menu, select Quick Menus -> Add Connection Profile.
Enter a Profile Name of your choice.
For Data Link Encapsulation select RFC 1483.
IP Enabled should be set to Yes, then select IP Profile Parameters.
Set Address Translation Enabled to No (tab to change the value).
Set IP Addressing to Unnumbered.
Set the Remote IP Address to 192.168.1.1 (192.168.200.10) and the Remote IP Mask to 255.255.255.0.
Unless you want to enable a filter set to filter traffic between your two networks, you should have no Filter Sets enabled. If so, select Remove
Filter Set to disable all filter sets from the Connection Profile.
Escape once and select Add Profile Now.
Escape once again to Quick Menu.
Select IP Setup.
Set the Ethernet IP Address to 192.168.2.10 and the Ethernet Subnet Mask to 255.255.255.0.
Set the Default IP Gateway to 192.168.1.1 (192.168.200.10).
Finally, if you want your router to be a DHCP server for your local LAN, select IP Address Serving, and configure. If you do not want your router to be a DHCP server for your local LAN, select IP Address Serving, and set IP Address Serving Mode to Disabled. You will then need to manually configure each of your workstations with an IP address on the 192.168.2.x network, and a gateway of 192.168.2.10.
Escape to the Main Menu, select Utilities & Diagnostics -> Restart System.

Connecting Router A and Router B

At this point, the two routers are configured to work correctly in back-to-back mode. The cable going between the two routers need only be two-wire RJ11 or RJ45 using only pins 4 and 5. Polarity of these pins does not matter. When ordering a line from the telco, you must ask for a "ISDN Capable Dry Line Pair." This line will meet the requirements for connecting the two devices together.

One important item of note is the distances for various speeds. In the following table, you can see the various speeds you can set, according to the maximum allowable distances.

Speed Setting
Maximum Distance*

160 Kbps 22,770 feet (4.31 Miles)
208 Kbps 20,000 feet (3.79 Miles)
320 Kbps 19,000 feet (3.60 Miles)
416 Kbps 17,900 feet (3.39 Miles)
784 Kbps 14,900 feet (2.82 Miles)
1.040 Mbps 12,500 feet (2.37 Miles)
1.568 Mbps 9,500 feet (1.80 Miles)

*The mileage distances are for reference only. All telco wire distances are measured in feet. There are approximately 5,278 feet in 1 mile.

Once a wire connection between the two routers is made, the Channel 1 LED should turn solid green after 60 to 90 seconds indicating that the two devices have successfully trained with one another. For an R7100 to R7100 setup, the WAN Event History of Router B should report events similar to the following:

For an R7171 to R7171 IMUX setup, the WAN Event History of Router B should report events similar to the following:

Summary:

Once the two Netopia Routers have been configured correctly, the networks should be able to communicate with one another using TCP/IP.

Note: This is an unsupported configuration. If, after following the steps in this technote, you continue to have problems getting back to back functionality, Netopia Technical Support will not be able to futher assist you.