[Blue Spirit]

Autor srale7

Jel postoje uopce USB 3 kablovi od 7m ?

USB 3.0/3.1 specification does not specify a maximum cable length between USB 3.0/3.1 devices (SuperSpeed or SuperSpeed+), but there is a recommended length of 3 meters (or about 9 feet and 10 inches).
However, the biggest limitation to the length of the cable is the quality of the cable.
Results may vary, but with a high quality cable you should be able to go beyond 3 meters.
However, to ensure you achieve the best results possible, use an active cable when going more than 10 feet (3 meters).

http://www.yourcablestore.com/USB-Ca...m_ep_42-1.html

USB 3.0 produžni kabl duljine do 3 metra možeš slobodno koristit bez gubitka signala tj brzine.

Možeš čak ići i do 5m sa kvalitetnim kablom, ... ali problem je kako češ znati dal je kabl dobre izrade ili je samo jeftini kinez u ljepom pakiranju po skupoj cijeni.

What improvements are made to USB 3.0 cables & hubs?

Not everything in USB 3.0 is a clear improvement.
Cable length, for one, is expected to have a significant limitation when used in applications demanding the highest possible throughput.
Although maximum cable length is not specified in the USB 3.0 specification, the electrical properties of the cable and signal quality limitations may limit the practical length to around 3 metres when multi-gigabit transfer rates are desired.
This length, of course, can be extended through the use of hubs or signal extenders.

Additionally, some USB 3.0 hardware, such as hubs, may always be more expensive than their USB 2.0 counterparts.
This is because by definition, a SuperSpeed hub contains 2 hubs: one that enumerates as a SuperSpeed hub, and a second one that enumerates as a regular high-speed hub.
Until the USB hub silicon becomes an integrated SuperSpeed USB plus Hi-Speed USB part, there may always be a significant price difference.
Some unofficial discussion has surfaced on the web with respect to fiber-optic cabling for longer cable length with USB 3.0.
The specification makes no mention of optical cabling, so we conclude that this will be defined in a future spec revision, or left to 3rd party companies to implement cable extension solutions for SuperSpeed USB.

https://www.everythingusb.com/superspeed-usb.html

https://www.usb.org/documents

11.4.7 Wire Gauge Table

Table 11-3 is a table of VBUS/Gnd wire gauges showing the relationship between gauge and maximum length in order to achieve the previously cited voltage drop values.
The user should note that these lengths are the maximum length possible to meet the voltage drop budget, thus gauges smaller and lengths greater than the table values will fail to deliver the expected voltage value.

Table 11-3. VBUS /Gnd Wire Gauge vs. Maximum Length

American Stranded Wire Gauge │ Ohms Per 100 │ Meters Maximum Cable Length
(AWG) on VBUS /Gnd           │ (Maximum)    │ (Meters)
   28                        │   23.20      │   0.8
   26                        │   14.60      │   1.3
   24                        │    9.09      │   2.0
   22                        │    5.74      │   3.0
   20                        │    3.58      │   5.3

5.5.7 Cable Assembly Length

This specification does not specify cable assembly lengths. A USB 3.1 cable assembly may be of any length as long as it meets all the requirements defined in this specification.
The cable assembly voltage drop budget defined in Section 11.4.2 and the cable assembly loss budget defined in Section 5.6.1.3.2, limit the cable assembly length.