User's Guide

BreadCrumb
®
LX4 User Guide Rajant Corporation
Version: 2.12 03-100117-001
2.4.1 Power
The input power interface to the BreadCrumb LX4 resides on the 19-pin Amphenol connector (see
see Figure 6 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 23 W with two radios, 30 W with three radios,
and 37 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 6 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 port, when accessed through the standard LX4 Cable Assembly (see section 2.5 ), 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 (see Figure 3).
To ensure proper operation of the BreadCrumb LX4, the inline injector must output a DC voltage
between 24 VDC to 48 VDC @ 23 W (two radio operation), 30 W (three radio operation) or 37 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.
The BreadCrumb LX4 ships with a standard 48 V AC/DC Passive PoE injector. The Rajant VHDC-
24 is an optional accessory, and supports powering the Breadcrumb LX4 from an unregulated DC
supply.
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Figure 6: BreadCrumb LX4 Ethernet and Passive PoE Connections