Specifications

Intel
®
810E2 Chipset Platform
R
Design Guide 91
3.21.3.5. Critical Dimensions
There are three dimensions to consider during layout. Distance ‘B’ from the line RJ11 connector to the
magnetics module, distance ‘C’ from the phone RJ11 to the LPF (if implemented), and distance ‘A’ from
82562EH to the magnetics module (see the following figure).
Figure 52. Critical Dimensions for Component Placement
Critical_place
ICH2 82562ET
Magnetics
Module
Line
RJ11
B
A
EEPROM
LPF
Phone
RJ11
C
Distance Priority Guideline
B 1 < 1”
A 2 < 1”
C 3 < 1”
Distance from Magnetics Module to Line RJ11
This distance ‘B’ should be given highest priority and should be less then 1”. Regarding trace symmetry,
route differential pairs with consistent separation and with exactly the same lengths and physical
dimensions.
Asymmetrical and unequally long differential pairs contribute to common-mode noise. This can degrade
receive circuit performance and contribute to emissions radiated from the transmit side.