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D.3 Result Codes
When the TA receives an AT command from the computer or terminal, it attempts to execute the
command, then sends a status message to the computer or terminal that reports the result of the
command. The TA provides you with several of these response messages, or result codes, which can
be displayed on your monitor or intercepted and used by your communications software. Using the
Vn command, you can select whether the result codes are terse (numbers) or verbose (words).
The TA's result codes are listed in the following table. Note that the speed of an ISDN B-channel is
always either 56Kbps (CONNECT 56000) or 64Kbps (CONNECT 64000) unless the call is a V.110
call in which case the reported connection speed with be that of the V.110 network rate.
Table D-3. Result Codes
Terse
Verbose
0
OK
1
CONNECT
2
RING
3
NO CARRIER
4
ERROR
6
NO DIALTONE
7
BUSY
56
CONNECT 56000 The TA has connected at 56000 bps.
64
CONNECT 64000 The TA has connected at 64000 bps.
P
/PPP
V
/V.120
X
/X.75
H
/HDLC
RF300E/RF310E
Definition
The TA executed the command without error.
The TA has established an ISDN connection.
The TA has detected a ring caused by an incoming call.
The TA did not detect a carrier within the time allotted by register S7.
There was an error in the AT command.
The TA has a poor connection to the ISDN network.
The TA has detected a busy signal.
The TA is using the Point-to-Point protocol.
The TA is using the V.120 rate adaption protocol.
The TA is using the X.75 rate adaption protocol.
The TA is using the HDLC protocol.
Appendix D - AT Command Summary
149
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