The package includes a novel non-intrusive Software Directional Coupler to separate up- and downstream traffic on full-duplex communication lines. BroadR-Reach allows multiple in-vehicle systems to simultaneously access information over single unshielded twisted-pair cables. The technology delivers relatively high-speed data, 100 Mbps, with low connectivity costs and cabling weight.
The BroadR-Reach physical layer (BR-PHY) uses three-level pulse amplitude modulation (PAM3) signaling, limited to 33⅓ MHz bandwidth, and a data scrambling technique to equalize power spectral density within the allocated band. It operates as a full-duplex connection with simultaneous Master-Slave/Slave-Master transmissions, so is more challenging to test than previous-generation networks such as CAN, CAN-FD and FlexRay. Until now, most automotive Ethernet testing solutions required insertion of a hardware directional coupler to separate the bidirectional data streams. But such couplers can interfere with normal functioning of the network and deliver misleading test results. The PicoScope Software Directional Coupler utilizes two non-intrusive differential voltage probing points a known distance apart, together with the known velocity of propagation in standard RG58 or Cat5 cable, to separate the transmitted data waveforms in each direction. Once the waveforms have been separated to show up- and downstream traffic, the PicoScope BroadR-Reach decoder can be used to display the contents of each data packet, aligned with the transmitted waveform. If required, two software directional couplers can be set up and decoded to show both the Master > Slave and Slave > Master communications at once. The decoded data can also be displayed in tabular listing format for ease of viewing. Filtering and search tools are provided to help engineers focus on specific packet and field contents of interest.
Pico Technology - www.picotech.com