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Light Peak

In: Computers and Technology

Submitted By zjklee
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Light Peak
Light Peak is a proprietary optical cable interface designed by Intel to connect devices in a peripheral bus. The technology has a high bandwidth at 10 Gbit/s, with the potential to scale to 100 Gbit/s by 2020.
Currently in development, Light Peak is being developed as a single universal replacement for current buses such as SCSI, SATA, USB, FireWire, PCI Express and HDMI, in an attempt to reduce the proliferation of ports on contemporary computers. Bus systems such as USB were developed for the same purpose, and successfully replaced a number of older technologies. However, increasing bandwidth demands have led to higher performance standards like eSATA and DisplayPort that cannot connect to USB and similar peripherals. Light Peak provides a high enough bandwidth to drive these over a single type of interface, and often on a single daisy chained cable.
As a single universal replacement for current buses such as SCSI, SATA, USB, FireWire, PCI Express and HDMI, Light Peak aims to remove some of the problems in the computer industry that are now apparent such as the limited transfer speeds and multiple connectors, many of which must be supported and then are often fated to go completely unused.
A major problem in single-cable connection is the maximum length of electrical cables – DC power and electrical signals diminish rapidly over more than 5 meter distances.
In theory, a device under 5m away could be easily served by either a 10Gb DC PoE or 4.8Gb USB 3 interface on a single cable for both power and data. However, if the device must be more than 5m away it will be separately powered by AC and must necessarily rely on an optical cable anyway to achieve sustained 10Gb speeds, whether this is an Ethernet "short reach" (300m) or Light Peak (100m) cable.
Light Peak is often billed as a "USB3 replacement" though its 2010 rhetoric suggests it is a fibre optic enhancement of it. Its initial data rate is only double that of USB 3.0 and still insufficient to replace all current monitor cables. The original USB 3.0 specification proposed 24 volts DC at 6 amperes (up to 144 W), which would be a great improvement on the actual USB 3.0 delivered specification of 5 VDC and 0.9 A, and the PoE specification (600 mA in IEEE 802.3at). Light Peak would require quite high power levels to run large bright monitors as seems to be its primary purpose, and even 144 W would seem to be low for this purpose. Gigabyte shipped USB 3.0 mainboards sourcing 2.7 A of current in 2010 so there is some evidence that USB 3.0 vendors would welcome a drastically greater DC power supply and would support Intel in pushing for a fully integrated AC, DC and fibre optic cable.

SCSI (Small Computer System Interface) - is a set of standards for physically connecting and transferring data between computers andperipheral devices.
SATA – (Serial Advanced Technology Attachment) - is a computer bus interface for connecting host bus adapters to mass storage devicessuch as hard disk drives and optical drives.
USB – (Universal Serial Bus) - is a specification to establish communication between devices and a host controller (usually personal computers), developed and invented by Ajay Bhatt while working for Intel.
FireWire – (IEEE 1394 interface) - is a serial bus interface standard for high-speed communications and isochronous real-time data transfer, frequently used bypersonal computers, as well as in digital audio, digital video, automotive, and aeronautics applications)
PCI Express – (Peripheral Component Interconnect Express) - officially abbreviated as PCIe (or PCI-E, as it is commonly called), is a computerexpansion card standard designed to replace the older PCI, PCI-X, and AGP standards.
HDMI – (High-Definition Multimedia Interface) - is a compact audio/video interface for transmitting uncompressed digital data.
Interface - is a point of interaction between two systems or work groups.
Ethernet - is a family of frame-based computer networking technologies for local area networks (LANs).
Optical fiber - is a thin, flexible, transparent fiber that acts as a waveguide, or "light pipe", to transmit light between the two ends of the fiber.
PoE - Power Over Ethernet
IEEE 802.3 - is a working group and a collection of IEEE standards produced by the working group defining the physical layer and data link layer's media access control (MAC) of wired Ethernet.

1. What is Light Peak ?
Light Peak is a proprietary optical cable interface designed by Intel to connect devices in a peripheral bus.

2. What the technology bandwidth ?
The technology has a high bandwidth at 10 Gbit/s, with the potential to scale to 100 Gbit/s .

3. For what Light Peak is being developed currently?
For replacement current buses such as SCSI, SATA, USB, FireWire, PCI Express and HDMI, in an attempt to reduce the proliferation of ports on contemporary computers.

4. For what USB bus system were developed ?
For the same purpose, and successfully replaced a number of older technologies.

5. What Light Peak technology aims to remove ?
Some of the problems in the computer industry that are now apparent such as the limited transfer speeds and multiple connectors

6. In theory, on what distance, the devices could be served on a single cable for both power and data?
5 m

7. What’s the initial data rate of Light Peak in a comparison with USB 3.0 ?
Its initial data rate is only double that of USB 3.0

8. How much the original USB 3.0 specification proposed of volts DC.
The original USB 3.0 specification proposed 24 volts DC at 6 amperes (up to 144 W).…...

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