User's Manual Part 1

7: Configuring the CCU

APCD-LM043-8.0 (DRAFT C) 127

configured to work with the LMS4000, and a list of authorized EUMs, with their grades of

service, have been entered in the RADIUS server’s user table.

If RADIUS accounting is enabled, the CCU will periodically send accounting updates to the

RADIUS server for each registered EUM. These updates will contain the Input and Output

Packet and Byte counts for each EUM, where Input Packets is the number of packets received

from the EUM, and Output Packets is the number of packets transmitted to the EUM.

To illustrate the configuration of the RADIUS server, consider the wired and wireless RADIUS

configurations shown in Figure 47 and Figure 48 respectively.

Figure 47 RADIUS Configuration - Wired Application

In wired applications, the RADIUS client is usually a PPP server; that is, a modem-bank

controller. The links that are being controlled are the dial-up connections between the user’s

modem, and the modem pool. To set up the PPP link, the user supplies a username and

password. The RADIUS client communicates with the RADIUS server, which is usually

situated in at a central location. The RADIUS server has access to a list (database) of

authorized usernames, and the associated user passwords (or it will have a means of

checking the user password) and options. The link between the RADIUS client and server is

protected by a “shared secret password”. RADIUS servers may serve many different clients,

each with its own modem pool, and different shared secret passwords.

Dial-up Modem

RADIUS Server

End-user Computer

RADIUS Client

Modem Pool, Router

Internet

Dial-up Modem

End-user Computer