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20 Circuit Protection for High-Speed Serial Interfaces Figure 3: Ethernet Port Protection (Source: Littelfuse) Figure 4: Ethernet Port Protection (Source: Littelfuse) selected carefully for proper coordination with the GDT. Littelfuse has specific products for these protection needs. For PPTC, Littelfuse offers the TRF, TS, and TSV series. For GDT, Littelfuse has the GTC series. At the same time, the Littelfuse SIDACtor Protection Thyristors include a wide range of semiconductor protection thyristor over-voltage transient suppression devices designed to serve the requirements of telecom and data- networking equipment applications. Ethernet Protection Let's now look at Ethernet solutions in the same contextual environments. For intra-building protection, one can generally use a simple diode array such as the Littelfuse SRV series (Figure 3). This will provide port protection from electrostatic discharge and fast electrical transients, and when this is used in an application where lightning is not a concern. One of the advantages of this TVS diode array is its low capacitance, which enables high transmission speeds. If one needs data speeds of greater than 1GB/s per second, one will need to employ additional twisted pairs. When going outdoors with Ethernet into a harsh environment, one will require additional protection (Figure 4). One Littelfuse solution for this area is protected from overcurrent with its TeleLink ® 461 series fuses. These are specifically designed for high-speed telecom applications, and you only need one fuse per wire pair. For protecting against lightning, Littelfuse suggests the GDT with the diode array. The class ratings will determine what specific protection you need. For example, if you need four kilovolts and two kiloohms. The GDT series that one might consider to include SG, CG6, and C65 and the Diode array can be the LCO3 series and SP40 series.