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Feature Reference DART 300 Modem
Page 54 2110212 Rev 1.0
3. +WPNEI=ip where ip is the NEI address to assign in dotted-decimal format. You do not
need leading 0s in the individual elements of the address. When you press <enter> the
modem will respond with a prompt to confirm the change in the table. The old and new
values are both shown.
Press Y (case insensitive) to confirm the change, or
Press N (or any key other than Y) to cancel the command.
The modem will respond with OK if the NEI is in a valid IP form.
4. +WPNEILIST to display the list and verify the new entry. Return to step 2 to make another
account entry as desired.
5. +WS176=n where n is the NEI table entry you wish to automatically register (1 through 4).
6. +WS174=n where n indicates the channel side (A or B) assigned by your CDPD provider for
the select account. Values for n are:
1 – A side preferred,
2 – B side preferred,
3 – A side only,
4 – B side only.
7. +WS173=1 to activate auto-registration.
At this point the modem starts to automatically acquire a CDPD channel and attempt to register
the selected NEI. This process will continue until the modem is successful. During auto-
registration, AT commands can still be issued and will be executed.
To use a different account when roaming to another region, execute steps 5 through 7 of the
procedure above.
7.2. Controlling Network Registration
The modem must be registered on the CDPD network before communication with it can begin.
Registering on the network is distinct from opening a session. This process involves an exchange
of identification, authentication, encryption keys, and sleep characteristics.
Registration provides connectivity; “locating” the modem’s NEI (IP address) in the network
topology so that routers can find it. The process of network registration is accomplished either
automatically, or manually using AT commands (detailed in Section 7.2.2 below). Auto-
registration is the factory default setting and is strongly recommended for most configurations.
For new NEI settings your CDPD service provider must have activated the NEI and reset the
credentials (trust-enabled the NEI) to allow the modem to be able to register. If the modem fails
to register (as determined by the process below) then consult Section 13 on Troubleshooting.
Registering on the network is distinct from opening a session. Registration simply confirms a
connection to the network as a whole and authenticates your modem’s credentials with your
CDPD carrier. Data Carrier Detect (DCD) is tied to sessions, not network registration. A session
does not begin until you originate a (client) session or answer one (as a server).
The process involves two distinct steps: channel acquisition and registration (authentication).
7.2.1. Channel Acquisition
7.2.1.1. Channel Scanning
Normally the modem will automatically scan for the first usable CDPD channel and attempt to
register. Whether or not it registers on that channel, it will quickly move to the best channel as it
receives information on adjacent channels from the CDPD network. The CDPD specification
defines the action the modem should take to acquire the strongest channel.
This search can be over-ridden by locking onto a specific channel, but doing so is strongly
discouraged. It can interfere with normal network operations.