Advantech MMP3-21 Manuale Utente Scaricare il pdf (Pagina 68)

Advantech SOM-Express Design Guide

68 Chapter 5 Carrier Board Design Guidelines

Figure 5-32 10/100M Ethernet Interconnection

Figure 5-33 Gigabit Ethernet Interconnection

5.7.3.3 Critical Dimensions

There are two critical dimensions that must be considered during the layout phase of

an Ethernet controller. These dimensions are identified in Figure 5-34 as A and B.

Distance A: Transformer to RJ-45 (Priority 1). The distance labeled A should be

given the highest priority in the backplane layout. The distance between the

transformer module and the RJ-45 connector should be kept to less than 1 inch of

separation. The following trace characteristics are important and should be observed:

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Advantech MMP3-21 Manuale Utente Pagina 68