Sierra Wireless DART 200 CDPD Modem - Manual (Page 41)

DART 200 CDPD Modem User’s Guide 2 Installation and Setup
PN1197-00 Revision 1.0 2-17
5 NEI successfully registered
The descriptions of S-Registers 56 and 126 usually give a good idea
of what the problem is. The following section describes some of the
most common conditions leading to registration failures.
Troubleshooting registration failure
The most common conditions leading to registration failures and possible
solutions are listed in Table 2-2. If your problem does not appear in
Table 2-2, or if after checking the conditions you cannot find the
problem, contact your carrier for assistance. If your carrier cannot find
the problem, then contact the modem supplier for guidance
Table 2-2. Registration failure troubleshooting
Condition Result
Code Solution
Weak signal
strength 0 or 254 1. Verify that the RSSI is adequate. Refer
to Channel acquisition, p. 2- 10, for
instructions.
2. If you are mobile, the signal could be
temporarily out of range. If you are
stationary, you could be in a marginal
reception area. If you are stationary
and have a magnetic mount antenna,
relocate the antenna while observing
S-Register 102. The objective is to get
a less negative value.
3. If this does not improve the signal, or
if you are mobile use a better (higher
gain) antenna. Do not use an antenna
with gain greater than the FCC
allowed maximum of 3 dB.
Wrong side
specified 3 (invalid
NEI) Check that you are operating on the same
side (channel range) as your carrier,
because if there are two CDPD carriers in
your area you may have acquired a channel
on the wrong system.
1. Use the AT&V command to view the
\Nn parameter, where n specifies
which side (1 = A side, 2 = B side)
you are operating on.
2. Correct the side setting, if necessary.