Block Diagram Of The G.703/13 Output Module - Symmetricom TSG-3800 Series User Manual

Output Modules
G.703/13 Output Module
Figure 7-24. Block Diagram of the G.703/13 Output Module
Power A and B on the main shelf provide power to the module. These redundant
sources of –48 vDC are diode-coupled and fused, allowing the module to draw
power from either source. The internal fuse labeled F1 protects the circuitry from
excessive current. The DC-to-DC Converter changes the negative voltage into +5
vDC; the green POWER indicator on the front panel is lit when either power source
is available to the module. The POWER indicator turns off when power is lost, for
example if the fuse on the module opens, if both –48 vDC power inputs are lost, or if
the converter fails.
276 TSG-3800 User's Guide
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12778474-002-2 Revision F – March 2004