Interface Fault Isolation; Transmit Faults (Tx_Intf) - Comtech EF Data SDM-650B Installation And Operation Manual

SDM-650B Satellite Modem

6.3 Interface Fault Isolation

Stored faults for the interface are reported in the StFaults menu (refer to Chapter 4).
The following sections list the interface faults. All other faults are discussed in Section
6.2.

6.3.1 Transmit Faults (TX_INTF)

The faults listed below are only displayed when the ASYNC overhead channel unit is
installed.
TX_PLL
CLK_ACT
Rev. 6
Fault
Indicates a loss of lock on the reference of the interface transmit clock recovery
oscillator.
Return the interface card for repair.
Loss of activity on the selected transmit clock source.
The modem will fallback to the internal SCT clock source with an accuracy
of 10 .
-5
Possible Problem and Action
Maintenance
6–15