Circuit Protection of Ethernet - Gigabit
The data signals used in an Gigabit Ethernet communications are 2Vp-p with maximum data rates of 250Mbps. At these data rates, the capacitance and linearity of the suppressor needs to be taken into account. The signal lines to be protected include T+/- and R+/-.
As shown at the left, a bridge circuit is used with a biasing network to achieve the needed low capacitance and linearity. The diodes are industry standard parts available from multiple vendors including Vishay. The P0080SCMC SIDACtor® device is used as the protection element. The TeleLink fuse is always used.
Other solutions within the Ruilon portfolio exist in addition to these recommendations. Some short haul applications can use a simple P0642SA SIDACtor® device without the bridge circuitry.
This solution is designed to comply with Telcordia’s GR-1089 inter-building and intra-building requirements.
This patent pending solution has been found to outperform LC-03-like devices, especially at higher temperatures and can usually be implemented at lower cost.