Page 376 - The ROV Manual - A User Guide for Remotely Operated Vehicles 2nd edition

368 CHAPTER 13 Communications
Table 13.7 Sample Ethernet Transmission Standards
10Base-T
10Base-F
100Base-TX
1000Base-T or 1GBase-T
10 Mbps baseband over two twisted pair
10 Mbps baseband over fiber-optic cable
100 Mbps baseband over twisted pair
1000 Mbps baseband over Cat 5e or higher cable
FIGURE 13.37
Example of protocol converters (a) fiber to Ethernet and (b) USB to DB-9.
13.4.6 Protocol converters
Many times, the computer running the sensor software does not have a compatible adapting device as most modern computers are sold with USB ports only. In order to adapt to some industry stan- dard sensors, some type of protocol converter must be adapted. For instance, the typical sonar sys- tem used with an ROV will transmit any of several protocols (RS-232, RS-422, RS-485, or Ethernet). In order to capture these into the surface computer, a protocol converter is required to convert between the serial standards (Figure 13.37).
The wiring on these converters must be closely examined as the various configurations of the peripheral equipment will determine the device’s wiring.