mitä eroa on USB2 ja Hi-Speed USB :llä ???
hi speed usb on ainaki 480mbps, mutta palion usb2 ?
onko ne ihan eri usb :eja eli niinkuin 1.1 ja 2.0.
kun kaverilla oli usb2 ja sit ku laitoin ulkoisen kovoni siihen niin se sano et: laite voi toimia nopeammin kun kytket sen usb hi-speed väylään. laitettiin sit 'ajuri' niin sen jälkeen se toimi nopeammin eikä tullu tuota herjausta enään.
hi speed usb on ainaki 480mbps, mutta palion usb2 ?
onko ne ihan eri usb :eja eli niinkuin 1.1 ja 2.0.
kun kaverilla oli usb2 ja sit ku laitoin ulkoisen kovoni siihen niin se sano et: laite voi toimia nopeammin kun kytket sen usb hi-speed väylään. laitettiin sit 'ajuri' niin sen jälkeen se toimi nopeammin eikä tullu tuota herjausta enään.
Vastaukset 5
Vanhimmat
nih,
..ei välttämättä, teknisesti sama, muttei välttämättä nopeuden osalta usb2 kun voi nopeudeltaan vähimmillään olla vain 1-version luokkaa.
palio teistäki o apua..
en usko että on sama asia.. koska miksi ois kehitelty Hi Speed usb jos se ois sama asia kuin usb2 ???
En minäkään usko, että maapallo kiertää aurinkoa.
Transfer speed
USB supports three data rates.
A Low Speed rate of 1.5 Mbit/s (183 KiB/s) that is mostly used for Human Interface Devices (HID) such as keyboards, mice, and joysticks.
A Full Speed rate of 12 Mbit/s (1.5 MiB/s). Full Speed was the fastest rate before the USB 2.0 specification and many devices fall back to Full Speed. Full Speed devices divide the USB bandwidth between them in a first-come first-served basis and it is not uncommon to run out of bandwidth with several isochronous devices. All USB Hubs support Full Speed.
A Hi-Speed rate of 480 Mbit/s (57 MiB/s).
Though Hi-Speed devices are commonly referred to as "USB 2.0", not all USB 2.0 devices are Hi-Speed. A USB device should specify the speed it will use by correct labeling on the box it came in or sometimes on the device itself. The USB-IF certifies devices and provides licenses to use special marketing logos for either "Basic-Speed" (low and full) or High-Speed after passing a compliancy test and paying a licensing fee. All devices are tested according to the latest spec, so recently-compliant Low Speed devices are also 2.0.
Hi-Speed devices should fall back to the slower data rate of Full Speed when plugged into a Full Speed hub. Hi-Speed hubs have a special function called the Transaction Translator that segregates Full Speed and Low Speed bus traffic from Hi-Speed traffic. The Transaction Translator in a Hi-Speed hub (or possibly each port depending on the electrical design) will function as a completely separate Full Speed bus to Full Speed and Low Speed devices attached to it. This segregation is for bandwidth only; bus rules about power and hub depth still apply.
A hub will have one or more Transaction Translators and there is no standard way to determine the number of transaction translators a hub may have. All low and full speed devices connected to one transaction translator will share the low/full speed bandwidth. This means that hubs can have dramatically different performance depending upon the number of transaction translators and the devices plugged into their ports. e.g. a hi-speed 7 port hub with only 1 transaction translator with 7 low/full speed devices plugged in, will act no differently than a USB 1.1 hub and all devices compete for the same low/full speed bandwidth. If the hub were to have a transaction translator for each of the seven ports, then each device would have all the full/low speed bandwidth available to it and would only compete for the hi-speed bandwidth, which is much greater. [1]