Page 30 of 133
Version 3.0 Rev r000
Date 25-08-2010
Part No. 96000001
4.1.1 Ethernet wiring considerations
The sonar head and SIM use gigabit Ethernet ports. There are rules, regarding number of pairs of
wire to use, between different Ethernet ports, those rules are:
• Gigabit to Gigabit
Need all four pairs. If only two pairs used, in an attempt to force the ports to 100BASE-T, the
ports will not negotiate and the result will be no connection. Sometimes it's not obvious if a port
is Gigabit enabled; try connecting unknown ports to a gigabit Ethernet switch and see what
speed it connects at via the status lights on the switch.
• Gigabit to 100BASE-T
Two pairs (green and orange on TIA/EIA-568-B wiring) can be used. Be sure to test this with a
modified patch cable (cut the brown and blue pairs) before committing to the chosen Ethernet
equipment as there may be surprises hidden in the equipment.
• 100BASE-T to 100BASE-T:
You can use two pairs.
When connecting to the SIM, use either of the AUX Ethernet ports for the sonar head Ethernet
connection.
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