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$15
Not used
$16
Test mode status
Binary code: OCCC ACOC
Default: 00 hex
BitO
| Local analogue loopback
0
Disabled
(See &T1-commands.)
1
Test in progress
Bit1
| Not used
0
Bit2
| Digital loopback
0
Disabled
(See &T3)
1
Test in progress
Bit3 | Status bit-indicates thal the
|0
Loopback off
modem has entered
1
Test in progress
Remote Digital Loop (RDL)
initiated by remote madem.
(See &T4- and &T5)
Bit 4
| Indicates Remote Digital
0
Inactive
Loopback (RDL).
1
Test in progress
(See &T6)
Bit5 | Indicates Remote Digital
0
Disabled
Loopback (RDL) with self
| 1
Test in progress
test
(See &T7.)
Bit6 | Indicates Local analogue
|0
Disabled
loopback with self test
1
Test in progress
(See &T8.)
Bil7
| Not used.
0
&T0-command ends any test and sets $16 to zero.
$17
Not used
$18
Test timer
Default:
0 disables the test timer.
Range:
0 -255 (seconds)
The duration of a test is determined by the content of $18
register. When a test has lasted for the time determined by the
S18 value (in seconds), the test is ended and the modem
returns to previous mode.
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