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Difference between BroadR-Reach MOST FireWire | BroadR-Reach vs MOST vs FireWire

This page compares BroadR-Reach vs MOST vs FireWire and mentions difference between BroadR-Reach, MOST and FireWire.


Following are the features of BroadR-Reach.
• It uses 3 level signaling
• Full duplex
• Echo cancellation
• PAM-3, 66.7 MSPS, 33.3 Bandwidth
• Single twisted pair
• Decision Feedback Equalization (DFE)

The major benefits of BroadR-Reach over traditional ethernets are as follows.
• Bandwidth is reduced by over 2 times.
• It operates over lower quality cabling.
• It permits aggressive filtering for improved emissions and immunity.


Following are the features of MOST.
• MOST is the short form of Media Oriented Systems Transport.
• It is high speed networking technology developed for automotive market.
• The technology can be applied both inside as well as outside the vehicle such as car
. • It can be used to transport audio/voice/data/video signals over plastic optical fiber.
• MOST serial bus uses ring type topology for connection between devices. About 64 maximum devices can be connected on ring network.
• The communication over MOST bus is synchronous.
• The common types are MOST25, MOST50 and MOST150.


Following are the features of FireWire.
• It is serial bus standard used for high speed communications and isochronous real-time data transfer.
• It is defined in IEEE 1394 standard.
• It is available in copper cable, cat-5 cable and optical fiber versions.
• It offers distance of about 4.5 meters with copper cable.
• It supports data rate of 400 to 3200 Mbps.
• It supports daisy chains upto 63 devices.
• It is superseded by thunderbolt and USB 3.0 interfaces.

Difference between BroadR-Reach MOST FireWire

Following table summarize difference between BroadR-Reach, MOST and FireWire.

Features BroadR-Reach MOST FireWire
Architecture Switched Shared synchronous ring Shared Bus
Topology Star, daisy chain, ring - all with optional productive redundancy Ring Star, daisy chain, ring - all with optional redundancy
Bandwidth 100 Mbps, 1000 Mbps, 10 Gbps widely deployed - 40/100 Gbps in development - Many other rates used in private networks (per link) 25 Mbps common, 150 Mbps in early deployment (shared) 100, 200, 400, 800 Mbps widely deployed - 1.6 Gbps in prototype, 3.2 Gbps specified (Shared)
Medium Single UTP (Flexray or equivalent at 100 Mbps), multiple UTP/STP, coax, all types of fiber. Plastic fiber, UTP Fiber and STP up to 800 Mbps, UTP to 100 Mbps, UTP up to 800 Mbps specified.
Sample Rate/Time Synch support Any arbitrary native rates (100 ps jitter - < 1 µs synchronization) 44.1 KHz native, sample rate conversion for other rates Any arbitrary native rats (100 ps jitter - <1 µs synchronization)
Diagnostics Built-in cable diagnostics that checks open, short, location of fault, quality of the medium. - -
Cost Low cost, approaching analog system, many billions of ports deployed. Higher, less than a million ports deployed. Higher, no deployment, but over one billion 1394 ports

Refer features of automotive ethernet and its requirement in automotive vehicles.

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