Rajant Corporation
BreadCrumb
®
LX4 User Guide
03-100117-001
Version: 2.02
2.4.1 Power
The input power interface to the BreadCrumb LX4 resides on the 19-pin Amphenol connector (see
Figure 3 and Figure 5). The device accepts external power in the range of 24 VDC to 48 VDC. The
peak power consumption of BreadCrumb LX4 is 20 W with two radios, 25 W with three radios, and
30 W with 4 radios at 24 VDC.
2.4.2 Ethernet
BreadCrumb LX4 contains two 10/100 Base-TX Ethernet ports, which can be accessed through the
19-pin Amphenol connector on the enclosure (see Figure 3 and Figure 5). Both ports support Auto
MDI/MDIX allowing the use of either straight-through or crossover data cables for connections.
The data interface includes electrostatic discharge, and electrical fast transient/burst immunity
compliant to the IEC 61000-4-2 ESD, and IEC 61000-4-4 EFT standards, respectively.
The ETH0 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 LX4. An external inline
injector is used to merge DC power for the BreadCrumb LX4 with data from a LAN port or a wired
client.
Warning
In order to avoid sparking and possible damage to the unit, be sure to connect the
powered Ethernet cable to the BreadCrumb LX4 before applying power to the
power supply.
To ensure proper operation of the BreadCrumb LX4, the inline injector must output a DC voltage
between 24 VDC to 48 VDC @ 20 W (two radio operation), 25 W (three radio operation) or 30 W
(four radio operation) minimum. Using a higher output voltage facilitates longer cable runs between
the inline injector and the ETH0 port on the BreadCrumb LX4.
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Figure 5: 19-Pin Amphenol Connector
