The ETH0 port supports Auto MDI/MDIX allowing the use of either straight-through or crossover data ca-
bles for connections. The data interface includes electrostatic discharge, and electrical fast
transient/burst immunity compliant to the IEC 61000-4-2, and IEC 61000-4-4-EFT standards, respectively.
For more information on the BreadCrumb ES1 sealed Ethernet connector, see Ethernet Connector.
2.4.2 Ethernet Port Pinout
On the BreadCrumb ES1, the Ethernet port supports both Mode A and Mode B for Passive PoE.
The following table indicates the pinout of the BreadCrumb ES1 Ethernet port for 1000BASE-T data and
power functions.
Table: BreadCrumb ES1 Ethernet Port Pinout
Pin at ETH0 Gigabit Data, Power
1 TxRx A +, DC + (mode A)
2 TxRx A -, DC + (mode A)
3 TxRx B +, DC - (mode A)
4 TxRx C +, DC + (mode B)
5 TxRx C -, DC + (mode B)
6 TxRx B -, DC - (mode A)
7 TxRx D +, DC - (mode B)
8 TxRx D -, DC - (mode B)
2.4.3 Power Requirements
The BreadCrumb ES1 ETH0 port supports Passive PoE and, therefore, acts as a dual function Ethernet and
DC power input port for the BreadCrumb ES1. An external inline passive PoE injector is used to merge DC
power for the BreadCrumb ES1 with data from a LAN port or a wired client.
The average idle power consumption of a BreadCrumb ES1 is 2.8 W at 24 V. The maximum peak power
consumption of BreadCrumb ES1 is 15 W at 24 V. Up to 2.5 W of additional power will be needed if a pe-
ripheral is being powered by USB (500 mA at 5 V is available at the USB port).
To ensure proper operation of the BreadCrumb ES1, the inline injector must output a DC voltage between
9 VDC to 30 VDC. Rajant recommends a minimum power supply of 19 W @ 24 VDC. Using a higher output
voltage facilitates longer cable runs between the inline injector and the ETH0 port on the BreadCrumb
ES1. For details on Rajant’s VHDC-Series power accessories, refer to the VHDC-Series spec sheet.
Table: BreadCrumb ES1 Power Requirements (Passive PoE)
Input Voltage Avg Idle Usage @ 24 V Max Peak Usage @ 24 V
9 - 30 VDC 2.8 W + USB usage 15 W + USB usage
Table: BreadCrumb ES1 Power Supply Options
Model
Rajant
Part
Number Type
Output
Voltage
(V)
Max.
Output
Current
(A)
Ethernet
Link Speed
(Mbps) Environmental
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