User's Manual

Rajant Corporation BreadCrumb
®
LX4 User Guide
03-100117-001 Version: 1.04
1.3.4.2 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.
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.
1.3.4.3 USB
The signals that interface to the BreadCrumb LX4 device's USB port are located on the 19-pin
Amphenol connector on the enclosure (see Figure 3 and Figure 5). The port is compliant to the
Enhanced Host Controller Interface (EHCI) and USB Transceiver 2.0 Macrocell Interface (UTMI+)
Level 2 specifications. The port supports all three standard data transfer rates of low speed
(1.5Mbps), full speed (12Mbps), and high speed (480Mbps). The power switch for the port includes
over current protection, thermal protection, in-rush current limiting, and hot-plug noise filtering.
The USB port can be used to perform BreadCrumb firmware upgrades. It can also interface to an
optional GPS receiver accessory available from Rajant.
1.3.5 Status LED
The Status LED (see Figure 3) is capable of displaying warning and error codes, and link states. The
LED Mode can be configured in BC|Commander to be ON (switchable), ALERTS ONLY
(switchable), OFF (non-switchable), or OFF (switchable). When the LED Mode is ON, the
BreadCrumb LED alternates between displaying the link state and any warnings or errors. When the
LED Mode is OFF, the BreadCrumb LED does not display any warnings, errors, or the link state.
When the LED Mode is set for ALERTS ONLY, the BreadCrumb LED alternates between displaying
the link state and any warnings or errors only if there are warnings or errors to report. If there are no
warnings or errors, the LED displays nothing.
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