Maxim Integrated Teridian V.22 bis Linux Softmodem for 73M1822/73M1922 MicroDAA User Manual
Page 10
V.22 bis Linux Softmodem for 73M1x22 MicroDAA User Guide
UG_1x22_043
10
Rev. 1.5
G
Guard Tone Selection
G0
No guard tone
G1
550Hz guard tone enabled
G2
1800Hz guard tone enabled
H
Hook Control
H0
On-hook (hang up)
H1
Off-hook (connect to phone line)
I
Identification
I0
Returns product identification code
I3
Returns firmware revision number
I4
Returns copyright notice
Returns TSC Softmodem information
J
PTT test
J0
Stop J test in progress
J1
Transmit DTMF tones specified by registers S12 and S13
J2
Transmit Answer tone or Calling tone specified by register S13 and S27
J3
Transmit modulation specified by registers S14, S30 and S60
J4
Transmit silence (quiet mode)
J5
Wait (To set up the wait time use J5.[n]. [n] is in 1/10 ms)
J6
Detect CAS and DTMF tones off hook(requires host polling of register S65)*
J7
Analog Interface Test Mode: Loops back the TXAP-TXAN signal to RXA
through external components to check if everything is wired correctly. Returns
OK, or ERROR. Signal Levels are specified with S113, S114-S115.
J8
Goes off-hook and wait for CAS tone. If a CAS is detected, send an ack and
detect a US CID .
*An alternate (preferred) method of detecting DTMF tones is available though usage of the
Caller ID DTMF detection mode. Refer to DTMF tones detection chapter at the end of this
document.