Introduction | DART 300 Modem |
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
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
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
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.
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