82583V Datasheet, PDF (333/374 Pages) Intel Corporation – Intel® 82583V GbE Controller

Design Considerations—82583V GbE Controller
11.5
11.5.1
11.5.2
11.5.3
Ethernet Interface
Magnetics for 1000 BASE-T
Magnetics for the 82583V can be either integrated or discrete.
The magnetics module has a critical effect on overall IEEE and emissions conformance.
The device should meet the performance required for a design with reasonable margin
to allow for manufacturing variation. Occasionally, components that meet basic
specifications can cause the system to fail IEEE testing because of interactions with
other components or the printed circuit board itself. Carefully qualifying new magnetics
modules prevents this problem.
When using discrete magnetics it is necessary to use Bob Smith termination: Use four
75 Ω resistors for cable-side center taps and unused pins. This method terminates pair-
to-pair common mode impedance of the CAT5 cable.
Use an EFT capacitor attached to the termination plane. Suggested values are 1500 pF/
2 KV or 1000 pF/3 KV. A minimum of 50-mil spacing from capacitor to traces and
components should be maintained.
Magnetics Module Qualification Steps
The steps involved in magnetics module qualification are similar to those for crystal
qualification:
1. Verify that the vendor’s published specifications in the component datasheet meet
or exceed the specifications in section 11.6.
2. Independently measure the component’s electrical parameters on the test bench,
checking samples from multiple lots. Check that the measured behavior is
consistent from sample to sample and that measurements meet the published
specifications.
3. Perform physical layer conformance testing and EMC (FCC and EN) testing in real
systems. Vary temperature and voltage while performing system level tests.
Third-Party Magnetics Manufacturers
The following magnetics modules have been used successfully in previous designs.
Manufacturer
Low Profile Discrete:
Midcom Inc.
Standard Discrete:
BelFuse
Pulse Eng.
Integrated:
FOXCONN
Pulse Eng.
Amphenol
BelFuse
Tyco
Part Number
000-7412-35R-LF1
S558-5999-P3 (12-core)
H5007NL (12-core)
JFM38U1C-L1U1W
JW0-0013NL
RJMG2310 22830ER C03-002
0862-1J1T-Z4-F
6368472-1
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