82562EP Datasheet, PDF (14/24 Pages) Intel Corporation – 82562EP 10/100 Mbps Platform LAN Connect (PLC)

82562EP — Networking Silicon
4.1.1
Termination Plane
Resistors are used to terminate noise from the unused inputs of both the RJ45 connector and the
magnetics module to the termination plane. The netname “termplane” is provided as a guide to the
termination plane. A termplane is a plane fabricated into the PCB substrate. This plane, which has
no DC termination, acts like one-half of a capacitor that provides a path for the coupled noise.
4.1.2
Termination Plane Capacitance
It is recommended that the termination plane capacitance equal a minimum value of 1500 pF. This
helps reduce the amount of crosstalk on the differential pairs (TDP and TDN and RDP and RDN)
from the unused pairs of the RJ45. Pads may be placed for additional capacitance, which may be
required if failure occurs during electrical fast transient testing.
Note: This capacitor must be designed to tolerate 2 KV voltage injections to meet International Special
Committee on Radio Interference (CISPR) Electrostatic Discharge (ESD) specifications.
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Datasheet