User's Guide

User’s Guide CDPD Operation
2110059 Rev 1.0 Proprietary and Confidential Page 33
5. +WS174=n where n indicates the channel side preference. Values are:
0 – A side preferred,
1 – B side preferred,
2 – A side only,
3 – B side only.
NOTE that this preference is stored in a register not associated with a particular entry in the
NEI table. The preference will be used for all NEI registrations.
5.2.2. SPNI Matching
If you want to restrict the modem to only using channels belonging to a particular list of service
providers you can enter a table of SPNI values. When the modem is finding a channel, it will
check the SPNI of each channel against entries in this table. If there is no match, the modem will
reject the channel and continue searching.
If the table is empty, the SPNI matching feature is disabled.
NOTE: If you set SPNI matching and also use +WPCHAN to assign a channel manually, the
assigned channel will not lock if the SPNI fails to match. The modem will not be able to register
because it will not look for another channel if you have manually set a channel. The channel lock
can be checked using +WPRSSI.
5.2.2.1. SPNI Table Configuration
To manage the use of SPNI matching using AT Commands enter the following commands (the
AT is omitted for brevity):
Read the Current SPNI Table
1. +WPSPNI? Displays the SPNI Table. If the table is empty then SPNI matching is disabled.
If there is at least one entry then SPNI matching is enabled.
Disable SPNI Matching
1. +WPSPNI= By not entering parameters, the table will be erased. An empty table disables
SPNI matching.
Enable SPNI Matching
1. +WPSPNI=n[,n[,…n]] where n is a SPNI value and multiple values are separated by
commas. The list of parameters provided will replace any previous table. You cannot append
entries to an existing table. You may enter up to 10 values in the table. By entering one or
more SPNI values, the SPNI matching feature is automatically enabled.
5.3. 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 session. Registration simply
confirms a connection to the network as a whole and authenticates your modem’s credentials.
Data Carrier Detect (DCD) is tied to sessions not network registration. A session does not begin
until you originate a session (client) or auto-answer one (server).
The modem can be set to register manually (on command) or automatically when it enters CDPD
mode. The NEI address used for registration is determined differently for each method.
The mode of registration is set in register +WS173 (Registration Mode). A value of 0 indicates
manual registration and 1 indicates automatic. The modem is shipped with a value of 1 but the
modem will always default to the last method used. Restoring settings with &F (factory) or
Z (user profile) will NOT restore a setting to this register.
For WirelessExpert to work, the modem must be set to automatic registration.