Electrical Interfaces; Power Input; Ethernet Interface; Figure 5-5: Power Input Interface Schematic - Focal 922-DSLH User Manual

Model 922-DSLH – User Manual

5.4 Electrical Interfaces

This section shows the schematics of the user accessible interface circuits, which are the +24V power input,
copper Ethernet interfaces, and serial channel interfaces.
5.4.1 +24V Power Input
The power input interface schematic in the figure below shows the input protection diodes, common mode EMC
filter and DC-DC converter. Power input must be within +20VDC to +28VDC. Ideal input voltage is +24VDC
and provided by a supply with a Safety Extra Low Voltage (SELV) rating. See section 2.0 for specification
details. Power inputs VIN1+/VIN2+ and diodes D21/D22 allow for redundant power supply hookups. The diodes
also provide reverse voltage protection. The DC-DC converter provides an electrically isolated +3.3V DC output.

Figure 5-5: Power Input Interface Schematic

5.4.2 Ethernet Interface

The Ethernet interface schematic shown in the figure below, is identical for both Ethernet copper ports. This
schematic shows the transformer isolation, ESD protection, REF (shield), and termination used.

Figure 5-6: Copper Ethernet Interface Schematic

Focal Technologies Corporation Page 5-7
A Moog Inc. Company Document No. 922-0677-00, Rev 1.0