DART 200 CDPD Modem User’s Guide 2 Installation and Setup
Sierra Wireless, Inc. 2-16
The bit definitions in Figure 2-5 are as follows:
• Channel acquired indicator (bit 7)
• Automatic registration switch (bit 5)
• Registration indicator (bit 0)
An odd value in S-Register 57 indicates a registered modem.
If the DART has problems registering, begin problem determination by
checking the contents of S-Register 56 with the ATS56? command. The
possible return codes are listed below:
• S-Register 56 Return Codes
Return codes 0 through 7 are suggested by the CDPD specification.
0 Reset condition - Also, registration is incomplete but did
not time out. Refer to the description of S-Register 126 in
the next bullet point for details
1 Registration denied - Usually means IP Address is being
used by another device. On some systems it could also be
an invalid NEI or a credentials mismatch
2 Service currently unavailable
3 Invalid NEI (IP Address)
4Insufficient authentication credentials
5Unsupported authentication credentials
6NEI has exceeded usage limitations
7 Service denied on this subnetwork - service can be obtained
on an alternate Service Provider network
250 Timer expired waiting for the home MDIS Intermediate
System Confirmation (ISC) registration response - Usually
caused by router problems between the home and serving
MDISs
251 MDLP parameters unsupported
252 MDLP version unsupported
254 Could not access the CDPD network
255 Could not de-register because M-ES was not registered
• S-Register 126 - Registration Progress Indicator
CDPD registration is a four-step process that can, if there are
problems anywhere in the system, be delayed or halted at any of the
steps. If your registration attempt is unsuccessful, use ATS126? to
view S-Register 126 to determine at what step in the registration
process progress halted.
0Protocol not active
1Waiting for Temporary Equipment Identifier (TEI) assignment
from MDIS
2Link connection establishment pending - waiting for the
Unnumbered Acknowledgement (UA) from MDIS
3Encryption key exchange pending - waiting for MDIS Key
Exchange (IKE) from MDIS
4Registration pending - End System Hello (ESH) sent, waiting for
Intermediate System Confirmation (ISC) from MDIS
??
NOTE:
Most carriers and
equipment
manufacturers follow
these guidelines making
problem determination
easier. If these
guidelines are not
followed, more
ingenuity is required.