Ethernet (Rj45); Auxiliary; Antenna - JRC Alphatron LT-3100 Iridium Installation & Operation Manual

6.4 Ethernet (RJ45)

The LT-3110 Control Unit has an Ethernet LAN (RJ-45) interface, currently supporting service &
maintenance. The Ethernet interface must be used to access the built-in web server, which is further
described in section Web server on page 40. The LT-3110 Control Unit will automatically request and
obtain an IP address when connected to a Local Area Network (LAN) with a DHCP server (e.g. a
router). If connecting the LT-3110 Control Unit directly to a PC, the two will automatically negotiate
an IPv4 Link-Local address. The current IP address can be found in the user interface display (Menu ->
System -> Network: IP Address).

6.5 Auxiliary

The auxiliary connector is a 10-pin connector (male) mounted on the backside of the LT-3110 Control
Unit as illustrated in Figure 3 on page 17 and marked with 'AUX'. The auxiliary connector supports
the following interfaces:
• RS-422 serial interface
• 2 x Input/output (I/O)
The auxiliary interface is not supported in software version 1.01.
Use only the G-007774 Auxiliary Cable, 3m delivered by Alphatron Marine for
NOTE
connecting to the auxiliary connector on the backside of the LT-3110 Control Unit.
The Auxiliary Cable, 3m is an accessory part and must be acquired separately.

6.6 Antenna

The LT-3110 Control Unit and the LT-3130 Antenna Unit must be connected using a coaxial cable.
Both the control unit and the antenna unit have a N connector (female) mounted. This section will
specify the requirements to the coaxial cable. The minimum set of requirements are specified in
Table 1 and Figure 18 on page 30.
Cable impedance
Maximum signal loss
Maximum DC resistance
Table 1: Minimum requirements for the coaxial cable connecting the LT-3110 Control Unit and LT-3130
In most cases it will be the DC resistance that will determine the maximum length of the coaxial
cable. It is important to note that the input voltage of the control unit is important for the length of
the coaxial cable that can be used. The following formula can be used to calculate the length of the
coaxial cable:
29 | Interfaces
50 Ω
47.7 dB/100 m @ 1.5 GHz
See Figure 18 on page 30
Antenna Unit