Proper Termination for Using
HomePNA only Mode
Application Note
Proper Termination for Using
HomePNA only Mode
Application Note
Figure 1 shows the recommended termination resistors in HomePNA mode when the 10BASE-T Ethernet port is not used. The termination is required to
reduce the noise injected back to the PCnetTM-Home
or HomePHYTM device. This noise is created by the
link pulse driven into the open pins of the 10BASE-T
port. This implementation also helps to improve the
input sensitivity of the HomePNA port.
+3.3 VR
2K
50 Ω
1K
RX50 Ω
AM79C978
or
AM79C901
RX+
TX+
25 Ω
HomePNA
Magnetic
TX-
HR+
HR-
HR+
102 Ω
RING
TIP
RJ-11
CTAP
HR22348A-1
Figure 1. HomePNA Mode
(10Base-T Port not Connected)
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Publication# 22348 Rev: B Amendment/0
Issue Date: April 1999