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pavl0v

Скорост на пренос на данни с различни портове

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    Питали ли сте се каква е скороста на IrDA сравнена с тази на Bluetooth, или колко по-бърз е USB2.0 от USB1.1, погледнете това и ще разберете!

    MoboRear.JPG

    Protocol__________________MB/s

    IrDA-Control.....................0.009

    Serial................................0.02

    Parallel.............................1.0

    Bluetooth 1.1.....................0.125

    Bluetooth 2........................2 to 12

    USB 1.1.............................1.5

    USB 2.0.............................60

    SCSI 1..............................5

    Fast SCSI 2......................10

    Fast Wide SCSI 2..............20

    Ultra SCSI........................20

    Ultra Wide SCSI................40

    Ultra2 SCSI......................80

    Ultra 160 SCSI..................160

    FireWire (IEEE 1394)...........50

    FireWire (IEEE 1394b)........100

    ATA IDE connections

    Ultra66_cable.jpg

    Ultra DMA ATA 33 - 60ns cycle time - 33MB/sec transfer rate. ATA-33.

    Ultra DMA ATA 66 - 30ns cycle time - 66MB/sec transfer rate. ATA-66 -синия

    Ultra DMA ATA 100 - 100MB/sec transfer rate.

    Ultra DMA ATA 133 - 133MB/sec transfer rate

    Serial-ATA.

    Serial ATA ---------150Mbytes/sec

    Serial-ATA II ------3Gbits/sec.

    PCI

    PCI-X ------133MHz ------------- 1.1GBytes/sec

    Intel's 3GIO (Third Generation Input/Output) - ---20Gbits/sec

    Редактирано от pavl0v (преглед на промените)

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    Хм, не мога да разбера защо не ми работят картинките...sad.gif

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    А колко е бърз Bluetooth на GSM Simens 75s?

    Виж на телефона колко е бърз! Обаче е някуде към : Bluetooth 1.1.....................0.125МB/s (предполагам)

    Bluetooth Basics

    Bluetooth wireless technology is a short-range communications technology intended to replace the cables connecting portable and/or fixed devices while maintaining high levels of security. The key features of Bluetooth technology are robustness, low power, and low cost. The Bluetooth specification defines a uniform structure for a wide range of devices to connect and communicate with each other.

    Bluetooth technology has achieved global acceptance such that any Bluetooth enabled device, almost everywhere in the world, can connect to other Bluetooth enabled devices in proximity. Bluetooth enabled electronic devices connect and communicate wirelessly through short-range, ad hoc networks known as piconets. Each device can simultaneously communicate with up to seven other devices within a single piconet. Each device can also belong to several piconets simultaneously. Piconets are established dynamically and automatically as Bluetooth enabled devices enter and leave radio proximity.

    A fundamental Bluetooth wireless technology strength is the ability to simultaneously handle both data and voice transmissions. This enables users to enjoy variety of innovative solutions such as a hands-free headset for voice calls, printing and fax capabilities, and synchronizing PDA, laptop, and mobile phone applications to name a few.

    Core Specification Versions

    * Version 2.0 + Enhanced Data Rate (EDR), adopted November, 2004

    * Version 1.2, adopted November, 2003

    Specification Make-Up

    Unlike many other wireless standards, the Bluetooth wireless specification gives product developers both link layer and application layer definitions, which supports data and voice applications

    Spectrum

    Bluetooth technology operates in the unlicensed industrial, scientific and medical (ISM) band at 2.4 to 2.485 GHz, using a spread spectrum, frequency hopping, full-duplex signal at a nominal rate of 1600 hops/sec. The 2.4 GHz ISM band is available and unlicensed in most countries

    Interference

    Bluetooth technology’s adaptive frequency hopping (AFH) capability was designed to reduce interference between wireless technologies sharing the 2.4 GHz spectrum. AFH works within the spectrum to take advantage of the available frequency. This is done by detecting other devices in the spectrum and avoiding the frequencies they are using. This adaptive hopping allows for more efficient transmission within the spectrum, providing users with greater performance even if using other technologies along with Bluetooth technology. The signal hops among 79 frequencies at 1 MHz intervals to give a high degree of interference immunity

    Range

    The operating range depends on the device class:

    * Class 3 radios – have a range of up to 1 meter or 3 feet

    * Class 2 radios – most commonly found in mobile devices – have a range of 10 meters or 30 feet

    * Class 1 radios – used primarily in industrial use cases – have a range of 100 meters or 300 feet

    Power

    The most commonly used radio is Class 2 and uses 2.5 mW of power. Bluetooth technology is designed to have very low power consumption. This is reinforced in the specification by allowing radios to be powered down when inactive

    Data Rate

    1 Mbps for Version 1.2; Up to 3 Mbps supported for Version 2.0 + EDR

    Редактирано от pavl0v (преглед на промените)

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    "PCI-X ------133MHz ------------- 1.1GBytes/sec"

    Това за PCI-Express определено не го вярвам. Води се за сериен нишков интерфейс със скорост на нишката 250 МВ/s в едната посока, тъй като е двупосочен, максималната пропусквателна способност става 500 MB/s. В момента се произвеждат 1,2,4,8 и 16 нишкови интерфейси, което прави максимален трансфер на интерфейса PCI-Express x16 за последните графични ускорители - 8GB/s (duplex bandwidth).


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