How to configure a RAD modem pair


How to configure a RAD modem pair

NOTE:  The outdated and offensive "master-slave" terminology has been replaced with "Access point (AP) - Station (STA)" in all instances, but will still remain in the configuration software when implemented

General Information

RAD modems can be used to extend an Ethernet connection over a 4-wire copper cable for a distance of up to 4 miles.


Figure 1: Working configuration of a STA-AP RAM modem pair.

The two modems have a AP-STA relationship. New modems out of the box have no AP or STA setting; for our uses we have assigned the modem closest to the computer to be the AP modem and the one closest to the internet hub the STA modem. To get the modems to work requires the following:

  1. Set up the modems as shown in Figure 2 (below).

  2. Configure one modem to be AP.

  3. Configure the other modem to be STA.

Note: Before shipping:

  1. Reset user name and password to match the computer (the symbols & or @ are not allowed).

  2. Clear log tables.

Configuration of the AP modem

To configure the AP modem, set up the modem as shown in Figure 2 (below).



Figure 2: Set-up for configuration of the AP modem.

Connect the serial cable from the serial port on the back of the modem to port ttyS* on the back of the computer (where * represents the serial port number). Now open a terminal window and type:

[root@hostname]# ~]# cu -l /dev/ttyS0

(Note that in order for this command to be executed you must have cu installed. In Fedora, the rpm that provides cu is uucp.) The above command will take you into the configuration menu of the RAD modem.

ASMi-52

USER NAME:|
PASSWORD:


ESC - clear; & - exit; @ - scroll
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To access the modem you will need to enter a USER NAME and a PASSWORD. All modems out of the box have the following USER NAME and PASSWORD scheme:

WARNING! Never use the symbols & and @ when assigning user names and password to these modems.

USER NAME = < none just hit enter here >
PASSWORD = 1234

After you log in you will be in the Main Menu:

ASMi-52

Main Menu

1. Inventory >
2. Configuration >
3. Monitoring >
4. Diagnositics >
5. File Utilities >

> |


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Navigating through the menu is quite simple. To move forward within each menu option, enter the numbers that correspond to the menu options you see. To move backwards through the menu options, use the Esc key.

First, set the AP Clock setting. This setting governs whether the modem is a AP modem or a STA modem. In the AP Clock menu you have two choices: "Receive" and "Internal."

Giving a modem a AP Clock setting of "Internal" will make it a AP modem.

Giving a modem a AP Clock setting of "Receiver" will make it a STA modem.

To get to the AP Clock menu from the Main Menu, go into Configuration:

ASMi-52

Configuration

1. System Configuration >
2. SHDSL Configuration >
3. LAN Configuration >

> 1


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Choose System Configuration from within the Configuration menu.

ASMi-52

Configuration > System Configuration

1. AP Clock > (Internal)
2. Low Speed E1 Operation (NO)
3. Management >
4. Control Port >
5. Factory Default >
6. Reset >
7. Save

> 1


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Choose AP Clock from within the System configuration menu.

ASMi-52

... > System Configuration > AP Clock (Internal)

1. Receive
2. Internal

> 2


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To make this modem the AP, type 2 at the command prompt and then hit Enter. This will take you back into the System Configuration menu. To save the new setting, type 7 and hit Enter. Our modem is now a AP modem. To get back to the main menu, hit the Esc key. You may have to do so several times.

Use the same sequence of menu options to set the second modem to be the STA modem. The only two differences are:

  1. Switch the serial cable from the back of the AP modem to the modem that will be the STA modem. See Figure 3.

  2. In the AP Clock options, choose "Receive" instead of "Internal," and then Save.


Figure 3: Set-up for configuration of the STA modem.

After saving the "Receive" setting for the AP Clock setting on the STA modem, the two modems will go through a sequence of light blinking. Once they are done each modem will have three green lights in the front, which means the two modems are now working properly.

Configure User Name and Password

User name and password can be set from the Terminal menu.

From the Main Menu, select Configure > System Configuration > Control Port > Port Control > Terminal.

ASMi-52

... > Port Control > Terminal

1. Change Access >
2. POP ALARM (NO)
3. Security TimeOut (10 min)
4. Save

> 1


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Select Change Access.

ASMi-52

Change Access

1. User Name ...()
2. Password ...
3. Clear User Name ...
4. Clear Password ...

> 1


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To enter a new user name, type 1 and hit the Enter key. To enter a new password, type 2 and hit the Enter key. You must save any changes you make. Go back to the Terminal menu by hitting the Escape key, and save the new user name and password.

Clearing Log Files

Before shipping, it is a good idea to clear all log files in each of the modems. To do this, start from the Main Menu page and follow this sequence of menu options: Monitoring (3) > System Monitoring (2).

You should now be in the System Monitoring menu:

ASMi-52

Monitoring > System Monitoring

1. System Status []
2. System Log File []
3. System Clear Log File

> |


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Type 3 and then hit the Enter key to clear log files; type "Y" to confirm the clearing of the log files.

Setting the IP address and Manager Control

When the remote site has free IP address we can assign one to the AP modem and have access to it via a web browser. The IP address is given to the modem in the Management menu. To get to the Management menu, start from the Main menu and choose the following sequence of menu options: Configure (2) > System Configuration > Management (3).

ASMi-52

... > System Configuration > Management

1. Device Info >
2. Host IP >
3. Manager List >
4. Management Access >
5. MTU[64 - 1540] ...(1540)
6. VLAN Encapsulation >
7. Save

> |


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In the Management menu we need to configure two options:

To configure the Host IP, type 2 and hit the Enter key. You will now find yourself in the following window:

ASMi-52

... > Management > Host IP

1. Host IP address ...(0.0.0.0)
2. Host IP mask ...(0.0.0.0)
3. Host default gateway ...(0.0.0.0)
4. Read community ...(public)
5. Write community ...(public)
6. Trap community ...(public)
7. Save

> |


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Here you will need to enter a Host IP address, a Host IP mask and a Host default gateway. To enter the Host IP address, type 1 and hit the Enter key; you can now type in an IP address that is assigned to this modem. When you are done, hit the Enter key; this will put your cursor to the right of the ">". Now do the same for Host IP mask and Host default gateway. When you are done, hit the Esc key and Save.

To configure the Manager list, type 3 and hit the Enter key. The IP addresses on this list are the only ones that are allowed to log into the modem and make changes. We can specify up to 10 IP addresses. Each IP address has a corresponding network mask that must also be specified. You can enter these addresses in the same way we entered the Host IP addresses above.

ASMi-52

... > Management > Host IP

1. MNG 1 IP ...(0.0.0.0)
2. MNG 2 IP ...(0.0.0.0)
3. MNG 3 IP ...(0.0.0.0)
4. MNG 4 IP ...(0.0.0.0)
5. MNG 5 IP ...(0.0.0.0)
6. MNG 6 IP ...(0.0.0.0)
7. MNG 7 IP ...(0.0.0.0)
8. MNG 8 IP ...(0.0.0.0)
9. MNG 9 IP ...(0.0.0.0)
10. MNG 10 MASK ...(0.0.0.0)
11. MNG 1 MASK ...(0.0.0.0)
12. MNG 2 MASK ...(0.0.0.0)
13. MNG 3 MASK ...(0.0.0.0)
14. MNG 4 MASK ...(0.0.0.0)
15. MNG 5 MASK ...(0.0.0.0)
16. MNG 6 MASK ...(0.0.0.0)
17. MNG 7 MASK ...(0.0.0.0)
18. MNG 8 MASK ...(0.0.0.0)
19. MNG 9 MASK ...(0.0.0.0)
20. MNG 20 MASK ...(0.0.0.0)

> |


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Again, when you are done, hit the Esc key and Save. Now you are able to configure the modem via the internet by entering the following address into a web browser:

http:// < ip number assigned to the AP modem >

Set up the modems in between any internet connection to check that they work properly before shipping out to a site.



Article ID: 262
Created: May 11, 2009
Last Updated: June 12, 2020
Author: Beth Bartel

Online URL: https://kb.unavco.org/article/how-to-configure-a-rad-modem-pair-262.html