SBC-C57
SBC-C57 User Manual - Rev. First Edition: 1.0 - Author: S.O. - Reviewed by R.Z. - Copyright © 2021 SECO S.p.A.
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3.3
Connectors description
3.3.1
Gigabit Ethernet connectors
On board, there are two Gigabit Ethernet connectors, for the direct
connection of the SBC-C57 to two different wired LANs.
The Ethernet connection is realised by using two different Texas
Instruments DP83867 Ethernet PHY controllers.
First connection is available on connector CN2, and is always
available, The second connection, available on RJ-45 connector CN3, instead, is available only
as a factory option.
The connectors are type TRXCOM p/n TRJG16314A4NL or equivalent, with 2kV decoupling
capacitor, 100 Ohm impedance
This interface is compatible both with Gigabit Ethernet (1000Mbps) and with Fast Ethernet
(10/100Mbps) Networks. They will configure automatically to work with the existing network.
Please be aware that Gigabit mode will work only in case Ethernet is connected to compatible
switches/hubs/routers. For the connection, cables category Cat5e or better are required.
Cables category Cat6 are recommended for noise reduction and EMC compatibility issues,
especially when the length of the cable is significant.
On the connectors there are also two bicolor (Green /Yellow) LEDs for each port. Left LED
shows 10/100 or 1000 connection: green means 100Mbps connection, yellow means
1000Mpbs connection, when the left LED is Off then 10Mpbs or no connection is available.
The right LED blinks Green to show ACTIVITY presence
ET/ETHx_MDI0-: Ethernet Controller #x Media Dependent Interface (MDI) I/O differential pair #0. It is the Transmit differential pair in 10/100 Mbps modes,
and first differential pair in Gigabit Ethernet mode.
ET/ETHx_MDI1-: Ethernet Controller #x Media Dependent Interface (MDI) I/O differential pair #1. It is the Receive differential pair in 10/100 Mbps modes,
and the second differential pair in Gigabit Ethernet mode.
ET/ETHx_MDI2-: Ethernet Controller #x Media Dependent Interface (MDI) I/O differential pair #2. It is the third differential pair in Gigabit Ethernet mode (not
used in 10/100Mbps modes).
ET/ETHx_MDI3-: Ethernet Controller #x Media Dependent Interface (MDI) I/O differential pair #3. It is the fourth differential pair in Gigabit Ethernet mode
(not used in 10/100Mbps modes).
Gigabit Ethernet Port #1 CN2
Pin Signal
Pin Signal
1
ET
5
ETH0_MDI2-
2
ETH0_MDI0-
6
ETH0_MDI1-
3
ET
7
ET
4
ET
8
ETH0_MDI3-
Optional Gigabit Ethernet Port #2 CN3
Pin
Signal
Pin
Signal
1
ET
5
ETH1_MDI2-
2
ETH1_MDI0-
6
ETH1_MDI1-
3
ET
7
ET
4
ET
8
ETH1_MDI3-
