[802.3_SPEP2P] long short issues
I have some remarks on link noise specification:
-Alien Noise is specified for cables as 6 around 1 that means 6
disturbers. Connectors are specified as 3 around 1.
If only 1 disturber is used (as commonly done in dg ) we have to keep in
mind that in installations there will be 6 disturbers (7,8 dB)more noise.
At the momont we consider shielded cables but mainly unshielded
connectors, therfore the couplig will occur mostly at the connectors.
At the moment we mainly consider only cable to cable noise coupling and
neglegt connector coupling.
Most of the coupling will occur at the transmitting and receiving side
of the link were the connectors are near together.
One possibility to reduce the short long issue is to separete physically
the the connectors for long links and the short links.
Best regards
Dieter Schicketanz
Dr. Dieter Schicketanz
Consultant / Reutlingen University
Dieter_Schicketanz@xxxxxxxxxxx
Mittenwalderstr.81
82194 Gröbenzell
Germany
T:0049 (0) 8142 60139
C:0049 (0) 151 23474821
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