User Manual

WaveCom Electronics Inc

MA4040D Manual; MAN1L0901 REV 13(0104)

Approved: D.P.

Alarms Section:

This section indicates the alarm status of the modulator with simple red/green indicators.

IF LEVEL

The MA4050B module has detected a low level from the IF output power detector in the MA4050B module. The

alarm does not activate if the IF output has been manually disabled. This alarm condition may occur if there is no

data fed into the MA4050B module, or if the wrong interface is selected. It may also occur due to a hardware

failure in the module.

PLL LOCK

The MA4050B module has detected an unlock condition in the reference Local Oscillator (LO). In these

circumstances, the IF output frequency and symbol rate may be invalid. A hard alarm condition is declared, and the

IF output is disabled. This condition is most likely due to a major problem such as faulty AC input power, or a

hardware failure in the MA4010B power supply module or the MA4050B module itself.

ASI ERRORS

Errors have been detected in the ASI data stream that violate the coding of the data. This most likely indicates a

poor ASI signal due to low level or interference. This status appears only when the ASI input is selected.

ASI ACTIVITY

A lack of data activity has been detected on the ASI input. This is most likely due to the ASI input being

disconnected. This status appears only when the ASI input is selected.

QAM/ENCODE MISMATCH

This indicates that the QAM mode and the data coding are not correctly matched. Valid combinations are indicated

in the MA4050B manual under QAM Modulator Operating Modes.

INPUT SYNCH LOOP LOCK

The MA4050B is unable to synchronize to the input data. This may mean that the symbol rate does not match the

input data rate, modulation type, coding, and MPEG synchronization byte insertion if appropriate. Recheck the

calculations. Ensure that the correct data input mode is selected, and that there is valid data at the selected input.

ASI RATE VIOLATION

This indicates that the symbol rate has been set too low when operating with the ASI input. See the manual for the

lower limits of the symbol rate (typically 0.3 MS/s for 64QAM and 256QAM).