Low Power V.32 bis Modem
CMX869
QAM Modem Status Register b6-4: Signal to Noise
b6
b5
b4
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
Very good; could increase rate or retrain
Good
Normal
Poor
Bad; receiver will have a high error rate
Really bad; should decrease data rate or retrain
Unused
SNR not yet determined
QAM Modem Status Register b3-0: Operating Mode
b3
b2
b1
b0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
14400 bps V.32 bis
12000 bps V.32 bis
9600 bps V.32 / V.32 bis (with Trellis coding)
9600 bps V.32 (no Trellis coding)
7200 bps V.32 bis
4800 bps V.32 / V.32 bis
2400 bps V.22 bis
1200 bps V.22 / V.22 bis
Unused
Unused
Unused
Training / Rate negotiation
Transmitting 2100Hz answer tone
Tx silence, Rx idle
Tx idle, Rx waiting
Idle
An update to the Messages status (b15 – b10) or any change in SNR or Mode status (b6 – b0) will cause
b9 of the main Status Register to be set to 1.
© 2004 CML Microsystems Plc
34
D/869/4
CMLMICRO [ CML MICROCIRCUITS ]
