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Stop the Noiz

Moving Data at the Speed of Light (Peak)

Frank Fox - 2009.10.02 - Tip Jar

Popularity: LEMLEM

Tweet this article. Short link: http://bit.ly/6Wlg2

The news about Intel's new Light Peak sounds good - fast transfer rates using optical cables and useful for many types of devices.

If Light Peak is so great, it must be faster than anything else out there, right? Not true - it is a little slower than some current video protocols, but it has the same speed as 10 gigabit ethernet (that's ten times faster than the gigabit ethernet in modern Macs).

If it's not the fastest, what is the big deal?

While it is not the fastest, few protocols beat the theoretical transfer speed by much. Light Peak is the chameleon of transfer cable technology. If you want to send HD video, use this cable. If you need to transfer large data files, use this cable. Heck, if you want to do both at the same time with only one connection, use this cable.

It can send both send and receive 10 gigabits per second (Gb/s) at the same time. The cable has four optic fibers, each one capable of carrying 10 Gb/s. There are also plans to add a copper wire to the specification in order to power devices, for easy recharging and such.

Slow, Slow Wireless Speed

How does Light Peak compare to the latest technologies? The slowest is wireless. For example, Wireless N (802.11n) can reach 160 Mb/s in the real world. Light Peak is about 60 times faster.

Faster wireless standards will come out, but nothing even close to what a good cable can provide.

Cables Make a Difference with Ethernet

Moving on to other ethernet type connections, Apple first used Gigabit Ethernet on the "Mystic" Power Mac G4 in 2000. It gives a full 1 Gb/s. The fastest ethernet on the market is 10 Gigabit Ethernet (10GBase-T), and 100 Gigabit Ethernet is under development. You won't find 10G ethernet on many computers. The standard also makes use of fiber optic cable to achieve these transfer rates.

USB Leaps Ahead with 3.0

The latest USB 3.0 connectors are starting to make an appearance. We see that at best it will be only half the speed of Light Peak. USB 3.0 is rated at 4.8 Gb/s. Of course, theoretical and actual are two different things. In the past USB was unable to deliver more than about two-thirds of theoretical speed.

FireWire Isn't Dead Yet!

FireWire was an important competitor to USB, but it has been losing popularity. Still, the FireWire standard is still progressing. FireWire S3200 is planned to reach 3.2 Gb/s. That keeps it comparable to USB 3.0, but still much slower than Light Peak. I doubt we'll see many devices that use it.

Hard Drives Get a Speedy with SATA 6 Gb/s

Hard drives need to be speedy, and a new SATA protocol was recently released, SATA 6 Gb/s. As the name implies, it can go 6 Gb/s. The nice thing with this protocol is it remains compatible with older systems and hard drives. You do need to have the right motherboard to take advantage of the latest speed increase.

Video Takes the Cake: HDMI and DisplayPort

The newest video protocols, HDMI and DisplayPort, are both ready to transfer HD video content or huge blocks of data if all the wires are used together. HDMI version 1.3 and higher will transfer at 10.2 Gb/s, while DisplayPort can go up to 10.8 Gb/s. These are slightly better than Light Peak, but they are mostly designed for video. No one is pushing the data transfer rates of these protocols.

Transfer speed comparisons

Light Peak Covers All the Bases

The chart shows how Light Peak compares to all of these other protocols. At 10 Gb/s, it can cover a whole range of transfer protocols. The magic of Light Peaks is that it can become the cable of choice for all these protocols with no significant loss in transfer speed.

The folks at Intel are not finished with Light Peak. They plan to push the specification up to 100 Gb/s, with some stops along the way. There is plenty of room for growth - and hopefully backward compatibility - as this latest specification tries to find its way in the world of technology. LEM

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