ATO CMM 900-3W - Manual (Page 15)

Page 15 of 15
7. TROUBLESHOOTING
1. If the unit draws too much power. Please ensure that the correct power supply is used
and correctly wired.
2. If dialing out is repeatedly unsuccessful and the modem gives “NO DIAL TONE”
message, please check that the mobile service is available.
3. If the unit never connects on dialing out, please ensure that the ESN (Electronic Serial
Number) and the MIN numbers are correct.
4. Please check RSSI level. If it is low (< -95 dbm), positioning the antenna vertically should
improve it.
5. If remote landline modem connection drops frequently, please have the calling party set
S7=60 & S10 register to 200. This will make the modem more tolerant of the noise hits.
This can be done as follows:
ATS0=1S7=60S10=200&W&W1<CR>
If for some reason, the CMM 900-3W unit is not responding, please try the command:
AT&F&W&W1 <CR>
Whenever the command AT&F&W&W1 is issued, then you must do the following
ATS0=1\N2+MS=11,1,1200,2400X3&W&W1 <CR>
AT-SEC=1,15&W&W1 <CR>
If that also fails, power down the unit and power it up again. Also see next section on
FAQ.