Comtech EF Data SDM-300A - Manual (Page 258)

SDM-300A Satellite Modem Revision 6
Open Network Operations MN/SDM300A.IOM
10–2
The front panel interface provides four clock selections clocking the data out of the
buffer:
• Internal Clock (SCT)
• RX Recovered Clock (RXCLK)
• External Reference Clock (EXT)
• TX Clock Dejittered (TXCLK)
If either RXCLK or EXT is selected and then fails, the interface automatically switches
to SCT as the source.
AIS is detected in the receive data and reported to the M&C.
The receive data and selected clock are translated to the levels of the selected baseband
interface and output through the baseband loopback relay.
The octet path is used for transferring a clock pulse to the distant end terrestrial
equipment. The clock pulse rate is the IBS data rate
÷ 8. Refer to Figure 10-1 for a block
diagram of the IBS interface.