Hi,
I was going through routing guidelines for 1000Base-T Ethernet signals,
especially constraints on trace lengths between the PHY and the magnetics
and between the magnetics and the connector.
Microchip Technology Inc has an application note on Ethernet routing
guidelines where it is mentioned to limit the trace length between the
magnetics and the RJ-45 connector to 1 inch. TI also recommends placing the
magnetics close to the RJ-45 connector, though TI doesn't put any limit on
the trace length.
What could be the reason for such a constraint on the trace length? These
1000Base-T signals are supposed to run over upto 100 meters of UTP. Is this
length constraint due to to EMI concerns, or can there be any signal
integrity reason behind it?
Regards,
Edward Anto A
Senior Research Engineer
C-DOT
Bangalore
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