Comtech EF Data SDM-9000 - Manual (Page 169)

SDM-9000 Satellite Modem Maintenance
Rev. 4 6–11
6.1.4.2 Modulator PCB
Refer to Figure 6-6 for test point locations.
Test Points Signal Name
TP4 SYMBOL CLK
Symbol Clock
TP5 BIT CLK
Data Clock/3
TP8 GND
Ground test point
Figure 6-6. Modulator PCB Test Points