US Robotics 56K USB Modem User Manual page 33

&T<value>—Self-Test Commands
Use this command to perform diagnostic tests on the modem. Each test is designed to isolate a problem
location when experiencing periodic data loss or random errors.
Result codes:
• OK if <value> = 0.
• CONNECT if <value> = 1 or 3.
ERROR if <value> ≠ 0—1 or 3.
•
Table 35. &T<value> Commands
Command
&T0 Abort. Terminates the test in progress.
&T1 Local analog loop. This test verifies modem operation as well as the connection between
the modem and computer. Any data entered at the local DTE is modulated,
demodulated, and then returned to the local DTE. To work properly, the modem must be
offline.
&T3 Local digital loopback test.
&V<value>—View Active Configuration
Use this command to view the active modem profile.
Result codes:
• OK if <value> = 0.
ERROR if <value> ≠ 0.
•
An example of the results of the command are shown below:
Option
Comm Standard
CommandCharEcho
Speaker Volume
Speaker Control
Result Codes
Dialer Type
ResultCode Form
ExtendResultCode
DialToneDetect
Busy Tone Detect
LSD Action
DTR Action
Press any key to continue; ESC to quit.
Option
V22b Guard Tone
Flow Control
Error Control Mode
Data Compression
AutoAnswerRing#
AT Escape Char
CarriageReturnChar
Linefeed Char
Backspace Char
Function
Selection
Bell
Enabled
Medium
OnUntilCarrier
Enabled
Tone
Text
Enabled
Enabled
Enabled
Standard RS232
Standard RS232
Selection
Disabled
Hardware
V42, MNP, Buffer
V44 V42bis MNP5
0
43
13
10
8
56K USB Modem
User Guide
AT Cmd
B
E
L
M
Q
T/P
V
X
X
X
&C
&D
AT Cmd
&G
&K
\N
%C
S0
S2
S3
S4
S5
Command Reference - 27