Comtech EF Data SDM-9000 - Manual (Page 102)

SDM-9000 Satellite Modem Operation
Rev.4 4–29
4.2.3.4 RX Interface Faults
BUFFER UNDERFLOW Buffer underflow alarm. Indicates that a buffer underflow has
occurred.
BUFFER OVERFLOW Buffer overflow alarm. Indicates that a buffer overflow has
occurred.
RX DATA/AIS Data or AIS. When data fault is selected in the Configuration
Interface menu, the fault indicates a data-stable condition. This
indicates the data coming from the satellite is all 1s or all 0s (i.e.,
the data is not transitioning). When AIS is selected, the Alarm
indicates the data is all 1s from the satellite. When None is
selected in the Configuration Interface menu, the RX Data/AIS
Fault/Alarm is not activated.
Note: AIS is an alarm, not a switching fault.
FRAME BER Frame BER fault. Indicates that the frame BER exceeds 1 -3 .
BUFFER CLK PLL Buffer clock phase-locked loop fault. Indicates the buffer clock PLL
is not locked.
BUFFER CLK ACT Activity detector alarm of the selected interface RX clock. The
interface will fall back to the satellite clock when this fault is active.
DEMUX LOCK DEMUX lock fault. Indicates that the DEMUX is not locked.
RX 2047 LOCK RX 2047 lock alarm. Indicates the RX 2047 data pattern is not
locked.
Note: This alarm is only active when RX 2047 is on.
BUFFER FULL Buffer full alarm.
Indicates the buffer is less than 10% or greater than 90% full.
PROGRAMMING RX Interface programming fault.
CONFIGURATION TX Interface configuration fault.
Indicates the TX interface cannot execute a programmed
configuration parameter.