BroadR-Reach Ethernet standard
The BroadR -Reach Ethernet technology is a physical layer standard for connectivity applications in the automotive sector. BroadR -Reach technology allows multiple vehicle electrical systems to simultaneously access information over unshielded single twisted pair cable. According to Broadcom Corporation, which invented the BroadR -Reach Standard benefit automobile manufacturers that integrate the BroadR -Reach Ethernet standard, including through reduced connection costs and lower weight of the wiring.
BroadR -Reach Networks
The use of BroadR -Reach technology in the automotive industry enables the migration of several past applications into a single, open and scalable Ethernet network in the vehicle. Thus, electronic systems and devices can be integrated into the vehicle, such as security systems (360 - degree view parking assist, Rear view cameras, collision avoidance systems ), comfort and infotainment solutions. The suitable for Automotive BroadR -Reach Ethernet physical layer standard can be combined with switch technology IEEE 802.3, which can be 100 Mbit / s over unshielded achieve single- twisted pair cable. Thus, the wiring of all components is replaced by twisted- pair cable in the vehicle.
Physical Layer / Physical Layer
When BroadR -Reach automotive Ethernet standard is done simultaneous transmit and receive mode, ie full duplex over a single- pair cable instead of a half-duplex operation with 100BASE- TX, where a pair for transmitting and one pair for receiving the same data rate is required. For a better de-correlation of the signal, the digital signal processor ( DSP), a highly optimized scrambler used in comparison to the scrambler used for 100BASE- TX. This provides a signaling scheme that is required for automotive applications. The BroadR -Reach automotive Ethernet standard uses a signaling scheme with a higher spectral efficiency than that of the signaling scheme that is used for 100BASE- TX. This limits the signal bandwidth of the automotive Ethernet 33.3 MHz, about half of the bandwidth of 100BASE- TX. A lower signal bandwidth improves the return loss, reduced crosstalk and ensures that the BroadR -Reach automotive Ethernet standard meets the stringent EMC requirements in the automotive industry.
Standardization
The OPEN Alliance SIG is a Special Interest Group (SIG ), the BMW, Broadcom, Freescale Harman, Hyundai and NXP have formed to establish BroadR -Reach as an open standard and the widespread use of automotive Ethernet as the connectivity standard to promote for automotive network applications. Since its foundation in 2011 160 companies (as of December 18, 2013 ) became a member of the group.
Licensing
The BroadR -Reach automotive Ethernet standard was released in December 2011, after the formation of the OPEN Alliance Special Interest Group. A license for the specification of BroadR -Reach is available to all interested OPEN Alliance SIG members under RAND terms via a license from Broadcom Corporation.