BroadR-Reach

BroadR-Reach technology is an Ethernet physical layer standard designed for use in automotive connectivity applications. BroadR-Reach technology allows multiple in-vehicle systems to simultaneously access information over unshielded single twisted pair cable. Benefits for automotive manufacturers integrating the BroadR-Reach Ethernet standard include reduced connectivity costs and cabling weight, according to Broadcom Corporation, now Broadcom Limited, inventor of the BroadR-Reach standard.

Networks

Using BroadR-Reach technology in automotive enables the migration from multiple closed applications to a single open, scalable Ethernet-based network within the automobile. This allows automotive manufacturers to incorporate multiple electronic systems and devices, such as advanced safety features (i.e. 360- degree surround view parking assistance, rear-view cameras and collision avoidance systems) and comfort and infotainment features. The automotive-qualified BroadR-Reach Ethernet physical layer standard can be combined with IEEE 802.3 compliant switch technology to deliver 100Mbit/s over unshielded single twisted pair cable. This innovation bypasses traditional cabling for Ethernet connectivity, allowing all vehicle components to connect using wires that are lighter and more cost effective.

Physical Layer

The BroadR-Reach automotive Ethernet standard realizes simultaneous transmit and receive (i.e., full-duplex) operations on a single-pair cable. In order to better de-correlate the signals, the digital signal processor (DSP) uses a highly optimized scrambler when compared to the scrambler used in 100BASE-TX. This provides a robust and efficient signaling scheme required by automotive applications. The BroadR-Reach automotive Ethernet standard uses a signaling scheme with higher spectral efficiency than that of 100BASE-TX. This limits the signal bandwidth of Automotive Ethernet to 33.3 MHz, which is about half the bandwidth of 100BASE-TX. A lower signal bandwidth improves return loss, reduces crosstalk, and ensures that BroadR-Reach automotive Ethernet standard passes the stringent automotive electromagnetic emission requirements.[1]

Standardization

The OPEN Alliance SIG is a special interest group formed by BMW, Broadcom, Freescale, Harman, Hyundai, NXP and STMicroelectronics to establish BroadR-Reach as an open standard and to encourage wide scale adoption of automotive Ethernet as the connectivity standard in automotive networking applications. Since its inception in late 2011, membership has reached more than 140 members as of May 31, 2013.

IEEE 802.3 has standardized 100BASE-T1 in IEEE 802.3bw-2015 Clause 96.

Licensing

The BroadR-Reach automotive Ethernet standard was officially released in December 2011, following the formation of The OPEN (One-Pair Ether-Net) Alliance Special Interest Group (SIG) (OPEN Alliance SIG). License to the specification for BroadR-Reach is available to all interested OPEN Alliance SIG members under RAND terms via a license from Broadcom Corporation.

References
  1. Broadcom. "Broad-R-Reach Physical Level Transceiver Specification For Automotive Applications" (PDF). IEEE. Broadcom Corporation. Retrieved 29 September 2017.
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