Comtech EF Data SNM-1010L - Manual (Page 195)

SNM-1010L Data/Control Modem Revision 0
System Checkout MN/SNM1010L.OM
7.2.2.3 Transmit Interface Faults
Fault/Alarm Possible Problem and Action
TX DROP Not Applicable
TX DATA/AIS Data or incoming AIS.
When the AIS is selected in the Interface Utility menu for TX data
fault, the transmit interface fault TX data/AIS is monitoring a fault
condition of all 1s from customer data input to the modem. When data
is selected in the Interface Utility menu for TX data fault, the TX
interface fault TX data/AIS is monitoring a fault condition of all 1s or
0s. This is referred to as a data-stable condition (data is not
transitioning). This fault indicates there is trouble in the chain sending
data to the modem. The modem passes this signal transparently, and
takes no other action. This indication is a monitor function only, and
aids in isolating the trouble source in a system.
TX CLOCK PLL Transmitter phase-locked loop fault.
Indicates the transmitter PLL is not locked to the reference of the
interface transmit clock recovery oscillator. Contact the Comtech EF
Data Network Customer Support Department.
TX CLOCK ACT Activity detector alarm of the selected interface transmit clock.
Indicates the selected TX clock is not being detected. Check the signal
of the selected TX clock source to verify the signal is present. The
interface will fall back to the internal clock when this alarm is active.
CONFIGURATION Modulator/Demodulator Configuration fault.
Indicates a fault in either the Modulator or Demodulator state.
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