Comtech EF Data C5 - Manual (Page 240)

System Checkout C5/K1/K3 Integrated Satellite Terminal System
Rev. 0 6-16
6.3.3.3 Transmit Interface Faults
Fault/Alarm Possible Problem and Action
TX DATA/AIS Data or incoming AIS.
When the AIS is selected in the Interface Configuration menu for TX
DATA FAULT, the transmit interface alarm 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 Configuration
menu for TX DATA FAULT, the TX interface alarm 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 alarm indicates
there is trouble in the chain sending data to the modem. 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 EFData
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 Indicates invalid TX interface configuration.