Comtech EF Data SDM-9000 - Manual (Page 180)

Maintenance SDM-9000 Satellite Modem
6–22 Rev. 4
6.2.2.2.3 TX Interface Faults
Fault/Alarm Possible Problem and Action
TX DATA/AIS Data or incoming AIS fault.
When AIS is selected in the Interface Configuration menu for TX
data fault, the transmit interface fault TX data/AIS is monitoring
an alarm 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 fault TX data/AIS is
monitoring an alarm condition of all 1s or 0s. This is referred to
as a data-stable condition (the 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 alarm.
Indicates the transmitter PLL is not locked to the reference of the
interface transmit clock recovery oscillator. Return the interface
card for repair. The interface will fall back to the internal clock
when this alarm is active.
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.
PROGRAMMING Transmit interface programming fault.
Indicates the TX interface module has failed to program a current
configuration parameter. If this fault occurs, contact EFData
Customer Support for assistance.
CONFIGURATION Transmit interface configuration fault.
Indicates the TX interface module does not support a
programmed configuration parameter. This fault typically
happens when the programmed configuration does not match the
module hardware. Verify the programming of the TX interface
hardware matches the configuration parameters.