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Introduction DART 300 Modem
Page 14 2110212 Rev 1.0
The NEI, and side preference are all that are needed to connect with the network. These are
recorded within the modem by using the following AT commands (the AT is omitted for brevity):
1. +WPNEI=ip where ip is the NEI address to assign in dotted-decimal format. You do not
need leading zeroes 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.
2. +WS174=n where n indicates the application of the channel side (A or B) assigned by your
CDPD provider. Values for n are:
1 – A side preferred,
2 – B side preferred,
3 – A side only,
4 – B side only.
Setting one side preferred will mean the modem searches channels on that side first, but will also
check for CDPD channels on the other side should there be no usable signals on the preferred side.
Restricting the modem to one side only will prevent it from scanning the alternate side channels.
This is usually discouraged in mobile settings but can be done in the fixed (non-mobile)
installations for the DART 300.
When these two elements have been entered, the modem will automatically attempt to register on
the CDPD network.
3.6. CDPD Network Registration
Note that network registration must be performed before communication across the network can
begin. Registering on the network is distinct from opening a communication session. The
registration process involves an exchange of identification, authentication, encryption keys, and
CDPD sleep characteristics.
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 modem can be set to register manually (on command) or automatically when it starts or resets.
For this first test auto-registration is used. This is the factory default setting and no additional
action is required for this setup.
3.6.1. Verifying Network Registration
The status of the modem’s registration can be read at register +WS56 (Network Registration
Status). A value of 1 indicates the modem is registered. A value of 0 indicates that it is not
registered.