13.1.1 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. (As of the 16Nov2013 head
firmware, two pairs can be used; this will put the head in a 100BASE-T connection.) Sometimes
it's not obvious if a port is Gigabit enabled; the Status display shows the Ethernet connection
speed for the head. This is useful for troubleshooting connection issues.
• 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 (green and orange, T568B).
When connecting to the SIM, use either of the AUX Ethernet ports for the sonar head Ethernet
connection.
13.2 Data Rates
Bathy: ≈800 kb/s max (bathy data is sent twice, to GUI and data acquisition computer)
Snippets: ≈11Mb/s max
TruePix™: ≈ 5.5 Mb/s (magnitude +angle) max
≈ 3.5 Mb/s (magnitude) max
Water Column: ≈280 Mb/s max for magnitude only
≈560 Mb/s max for magnitude + phase
AI(FLS): Depends on GUI wedge size; more information will be added
The data rate, for water column data, can be significantly reduced by increasing the pulse width. At
certain pulse widths, the receiver sampling rate halves, which will make the water column data rate
halve.
As an example:
Pulse width 15µsec - 30µsec: 65 kHz sample rate = Ethernet: 35 Mb/sec (amplitude) 280 Mb/s
(amplitude and phase)
Pulse width 35µsec - 70µsec: 32.5 kHz sample rate = Ethernet: 17.5 Mb/s (amplitude), 140 Mb/s
(amplitude and phase)
Page 152 of 210
Version 5.0 Rev r002
Date 05-08-2014
Part No. 96000001
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