Connectors Description; Gigabit Ethernet Connectors - Seco SBC-C57 User Manual

3.3 Connectors description

3.3.1

Gigabit Ethernet connectors

Gigabit Ethernet Port #1
Pin Signal Pin
1 ETH0_MDI0+
2 ETH0_MDI0-
3 ETH0_MDI1+
4 ETH0_MDI2+
Optional Gigabit Ethernet Port #2
Pin Signal Pin
1 ETH1_MDI0+
2 ETH1_MDI0-
3 ETH1_MDI1+
4 ETH1_MDI2+
ETHx_MDI0+/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.
ETHx_MDI1+/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.
ETHx_MDI2+/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).
ETHx_MDI3+/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).
SBC-C57
SBC-C57 User Manual - Rev. First Edition: 1.0 - Author: S.O. - Reviewed by R.Z. - Copyright © 2021 SECO S.p.A.
On board, there are two Gigabit Ethernet connectors, for the direct
CN2
connection of the SBC-C57 to two different wired LANs.
The Ethernet connection is realised by using two different Texas
Signal
Instruments DP83867 Ethernet PHY controllers.
5 ETH0_MDI2-
First connection is available on connector CN2, and is always
6 ETH0_MDI1-
available, The second connection, available on RJ-45 connector CN3, instead, is available only
as a factory option.
7 ETH0_MDI3+
8 ETH0_MDI3- 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.
CN3
Please be aware that Gigabit mode will work only in case Ethernet is connected to compatible
Signal
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,
5 ETH1_MDI2-
especially when the length of the cable is significant.
6 ETH1_MDI1-
On the connectors there are also two bicolor (Green /Yellow) LEDs for each port. Left LED
7 ETH1_MDI3+
shows 10/100 or 1000 connection: green means 100Mbps connection, yellow means
8 ETH1_MDI3- 1000Mpbs connection, when the left LED is Off then 10Mpbs or no connection is available.
The right LED blinks Green to show ACTIVITY presence
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