BroadR-Reach vs MOST vs FireWire: Key Differences

This page compares BroadR-Reach, MOST, and FireWire, highlighting the differences between them.

BroadR-Reach

Here are the key features of BroadR-Reach:

The major benefits of BroadR-Reach over traditional Ethernet technologies are:

Here are the key features of MOST:

MOST stands for Media Oriented Systems Transport.
It’s a high-speed networking technology developed primarily for the automotive market.
The technology can be applied both inside and outside the vehicle (e.g., a car).
It’s used to transport audio, voice, data, and video signals over plastic optical fiber.
The MOST serial bus uses a ring topology for connecting devices.
Up to approximately 64 devices can be connected in a ring network.
Communication over the MOST bus is synchronous.
Common versions include MOST25, MOST50, and MOST150.

Here are the key features of FireWire:

It’s a serial bus standard used for high-speed communications and isochronous real-time data transfer.
It’s defined in the IEEE 1394 standard.
Available with copper cable, Cat-5 cable, and optical fiber versions.
Offers a distance of about 4.5 meters with copper cable.
Supports data rates from 400 to 3200 Mbps.
Supports daisy chains with up to 63 devices.
It has largely been superseded by Thunderbolt and USB 3.0 interfaces.

The following table summarizes the differences 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 to the features of automotive Ethernet and its requirement in automotive vehicles.