BreadCrumb
®
LX/LX3 User Guide
Rajant Corporation
Version: 2.91
03-100101-001
1.3.4 Power and Ethernet Connectors
The BreadCrumb LX/LX3 contains two 10/100 Base-TX Ethernet ports named ETH0/PWR RJ45
and ETH1 RJ45 (see Figure 3). Both ports support Auto-MDI/MDIX allowing the use of either
straight-through or crossover data cables for connections to the ports. Use of the supplied data cable
is recommended for outdoor installations. The supplied data cable features a ruggedized RJ45
connector which provides an environmental seal when connected to the ETH0/PWR RJ45 port on
the BreadCrumb LX/LX3.
The ETH0/PWR RJ45 connector also supports Passive Power over Ethernet (Passive PoE), and
therefore acts as a dual function Ethernet and DC power input port for the BreadCrumb LX/LX3.
An external inline injector is used to merge DC power for the BreadCrumb LX/LX3 with data from a
LAN port or a wired client.
To ensure proper operation of the BreadCrumb LX, the inline injector must output a DC voltage
between 18 VDC to 48 VDC @ 20 W minimum (1.1 A @18 VDC). For BreadCrumb LX3, the
inline injector must output a DC voltage between 18 VDC to 48 VDC @ 25 W minimum (1.4 A @18
VDC). Using a higher output voltage facilitates longer cable runs between the inline injector and the
ETH0/PWR RJ45 port on the BreadCrumb LX/LX3.
The BreadCrumb LX/LX3 ships with a standard 48 V AC/DC Passive PoE injector. The Rajant
VHDC-24 is an optional accessory, and supports powering the Breadcrumb LX/LX3 from an
unregulated DC supply.
Figure 5 shows the connection of the BreadCrumb LX/LX3 to the AC/DC POE inline injector. The
data/power output of the inline injector is connected to the ETH0/PWR RJ45 port of the
BreadCrumb LX/LX3. To avoid damage to the contacts of the ETH0/PWR RJ45 port, apply power
to the inline injector after connecting the data cable to the ETH0/PWR RJ45 port.
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