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Figure 4.2: CMS Application Example (Not to Scale)
The example in Figure 4.2 shows one of many possible installation configurations for the CMS.
In this example, ports have been configured as follows:
Network Port: The Network Port allows telnet access by remote Supervisors and/or
Users. When a telnet connection is established, the CMS will prompt the caller to enter a
password. If the Supervisor Password is entered, the CMS will recognize Supervisor Level
Commands; if a Port password is entered, the CMS will only recognize User Level
Commands. Supervisors are allowed to adjust port configuration, connect to any port, or
review unit status. Users are only permitted to review status and connect to ports that are
allowed by their Port password.
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Port 1 (System SetUp Port): This port has been left open in order to permit on-site
service personnel to access the Command Mode without disrupting other ports. Since
Port 1 is a System SetUp Port, the service tech is allowed password protected access to
Supervisor Level commands, and is able to connect to any port, change configuration, or
display unit status.
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Port 2 (Modem Port): An external modem has been installed at Port 2. This port has also
been configured for Modem Mode, which allows definition of a modem reset string,
initialization string, and hang-up string. When a caller contacts the CMS unit via modem,
a password prompt will be displayed. If the Supervisor Password is entered, the CMS will
permit access to Supervisor Level Commands; if a Port password is entered, the CMS will
only recognize User Level Commands. Supervisors are allowed to adjust port
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