Option 2: Rework Of Gigabit Magnetics; Replacement Of Magnetics For 10/100 Lan Controller With Optional Resistors Populated - Intel 82541PI Design Manual

TDP
TDN
TDCT
RDP
RDN
RDCT
10/100Base-T Magnetics Module
R1, R2, R3, & R4 may be any value between 0-ohms & 150-ohms
Rw, Rx, Ry, & Rz may be any value between 0-ohms & 100-ohms
R1, R2, R3, and R4 are populated for 10/100Base-T
Figure 17. Replacement of Magnetics for 10/100 LAN Controller with Optional Resistors
Populated
4.10.2

Option 2: Rework of Gigabit Magnetics

Option two is a rework of a gigabit magnetics component with an internal jumper for 10/100 Mbps
design.
In order to make a common footprint on differential pairs between the magnetics and RJ-45
connector for both 10/100 and gigabit LOM design, one of the approaches is to rework the
magnetics module for gigabit controller with internal jumpers to short pair three and four of
differential signals. OEMs need to work with their magnetics vendors for this option.
1. Intel is working with some magnetics vendors to standardize the pinout assignments on magnetics modules.
Application Note (AP-468)
82541PI(ER) and 82562GZ(GX) Dual Footprint LOM Design Guide
TXP
TXN
TXCT
RXP
RXN
RXCT
R1 = R2, and R3 = R4
Typically Rw = Rx, and Ry = Rz
operation.
R1
R2
R3
R4
Rw Rx
C_h
v
1
Pin_1
Pin_2
Pin_3
Pin_6
Pin_4
Pin_5
Pin_7
Pin_8
LAN
Connector
Ry Rz
43