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Advantages of BroadR-Reach | disadvantages of BroadR-Reach

This page covers advantages and disadvantages of BroadR-Reach. It mentions BroadR-Reach advantages or benefits and BroadR-Reach disadvantages or drawbacks.

What is BroadR-Reach?

• It is a automotive ethernet. It is used to construct physical network used to connect components within a car using wired network. It meets all the automotive vehicle requirements such as EMI, RFI, BW, latency, synchronization, network management etc.
• It is point to point ethernet PHY technology developed by Broadcom and adopted by OPEN Alliance.
• It specifies physical layer operating in full duplex mode over one pair of UTP (Unshielded Twisted Pair) cable at 100 Mbps.
• BroadR-Reach PHY supports MAC interfaces via MII (Media Independent Interface) as specified in IEEE 802.3 clause 22.
• BroadR-Reach (BR) PHY, BR-PCS and BR-PMA specifications are defined in IEEE 802.3-2012.
• BR-PHY uses 3 level signaling (PAM-3 with 66.7 MSPS) along with echo cancellation.
• It allows simultaneous access of information over single UTP by multiple in-vehicle systems.
• This provides single open and scalable ethernet based network within automobile vehicle.

Benefits or advantages of BroadR-Reach

Following are the benefits or advantages of BroadR-Reach:
➨It offers 100 Mbps over UTP or better cable in full duplex mode with BER better than 1 x 10-10.
➨It uses 33.3 MHz bandwidth which permits aggressive filtering for improved emissions and immunity.
➨Simultaneous information access over single cable reduces complexity of cable wirings and consecutively cable weight. This further reduces overall connectivity costs.
➨Various electronic systems can easily be installed by automotive manufacturers for parking, security, collision avoidance, infotainment and comfort.
➨It reduces signaling scheme which has higher spectral efficiency compare to 100Base-Tx. This reduces signal BW to 33.3 MHz which improves return loss (i.e. VSWR) and also reduces cross-talk. As a result this automotive ethernet (i.e. BroadR-Reach) meets stringent automotive EM emission requirements.
➨It is media independent ethernet standard interface and hence different medias can be used such as UTP copper, STP copper, fiber, coax, POF etc.

Drawbacks or disadvantages of BroadR-Reach

Following are the drawbacks or disadvantages of BroadR-Reach:
➨It is "new comer" in the automotive market which has stiff competition from existing technologies such as CAN, LIN, FlexRay, MOST, LVDS etc.
➨It offers distance of up to 15 meters using UTP (Unshielded Twisted Pair) and 40 meters using STP (Shielded Twisted Pair) for 100 Mbps data rate.

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