Configuration Settings; Figure 5.5-2: Eib-10/100 Rj-45 Grounding Options - Moog 903 User Manual

903-0623-00 Rev. A Model 903 User's Guide, FMB-X-2.5 Version

5.5.2 Configuration Settings

Internal connections of the RJ-45 PCB jack are shown below in Figure 5.5-2. Inside each jack, RJ-45 pins
4, 5, 7, 8 are connected through 75 ohm resistors and a capacitor to a voltage reference (E_GND) on pin
8 of the PCBA header. (All three jacks share the same E_GND reference.) Switch S8 on the board allows
E_GND to be shorted to either chassis ground (default), through the front panel, or REFEL. Similarly,
case pins 13 and 14 on all jacks are connected to a common shield reference that may be shorted to
either chassis or REFEL with switch S9. If the external RJ-45 connector is shielded, the cable shield will
contact the case of the RJ-45 socket. REFEL is a special voltage reference only available on custom
backplanes and typically not used in most systems.

Figure 5.5-2: EIB-10/100 RJ-45 Grounding Options

Note: EIB-10/100 PCBA (Rev. 2) shows the ground/shield switches as S8 and S9 respectively and
EIB-10/100 PCBA (Rev. 1) shows the ground/shield switches as S5 and S6 respectively.
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