Comtech EF Data SDM-650B Installation And Operation Manual page 290

Asynchronous Overhead Channel Unit
F.5.2.3.4 Transmit Faults (TX_INTF)
The faults listed below are only displayed when the ASYNC overhead channel unit is
installed.
Refer to Section 6.2 for option explanations.
TX_PLL
Clk_Act
F.5.2.3.5 Receive Faults (RX_INTF)
The faults listed below are only displayed when the ASYNC overhead channel unit is
installed.
Refer to Section 6.2 for option explanations.
BUF_UNFL
BUF_OVFL
RX_PLL
Buff_Clk
MUX_lock
F–32
Interface transmit clock phase locked loop fault.
Clock activity fault.
Activity detector alarm of the selected interface clock. The interface will fall
back to the internal clock when this fault is active.
Buffer underflow fault.
Typically indicates that a buffer underflow has occurred.
Buffer overflow fault.
Typically indicates that a buffer overflow has occurred.
Interface receive clock phase locked loop fault.
Buffer clock activity fault.
Activity detector alarm of the selected interface receive clock.
MUX lock fault.
Typically indicates that the MUX is not locked.
SDM-650B Satellite Modem
Rev. 5