Best USB Hubs

A USB hub is a device that allows to concentrate several USB ports (Universal Serial Bus: universal serial bus), allowing connection to a machine with a single bus. It could be defined as a reseller or USB hub port connectors many or few.

USB Hubs

Classification

For USB version

The USB version of a hub determines the type of devices that can be connected:

  • USB 1.0 or USB 1.1: supports devices “Low Speed” (low speed up to 5  Mb / s) and “Full Speed” (high speed, up to 12 Mb / s). See more definitions on eusbhubs.com.
  • USB 2.0: Inaddition to the above, supports devices “High Speed” (high speed, up to 480 Mb / s).

To use devices “High Speed”, both the hub and the computer port to which it must be USB 2.0 is connected.

  • USB 3.0: Inaddition to the new appearance of the device “Super Speed” (Compatible with extended speed 5Gbps per second)

By type of power supply

 

USB 2.0 Hubs

* No power supply or “bus-powered”: it takes USB power bus. These concentrators can have four ports at most and only support connecting low power devices, ie, having a maximum consumption of 100  mA each, for a total of 500 mA (400mA for the 4 devices more 100mA for own power HUB)

  • With power supply or “Self-powered”: have their own external power supply, the theoretical limit for the number of ports of such hubs is 127, but itis difficult to find one with more than 8 healthy ports (most efficient)

By number of ports

A bus-powered hub can have four ports, while a self-powered hub can have, theoretically, up to 255 ports (however, the maximum number of simultaneously connectable USB devices on a bus is 127). Most hubs have four or seven ports. Although at present technologies are increasing the number of connectors.

A USB hub is a device that allows many USB devices to be connected to a single USB port on the host computer or another hub established 1ºPuerto

The USB hub are integrated often on the computer keyboards or, more rarely, monitors, printers, etc. The USB hub come in a wide variety of similar ways to a network hub, small designs intended to be plugged directly into the USB port on the computer.

Energy

Sanwa has introduced a new USB 3.0 Hub with a super fast.

A bus-powered hub (bus-fed) takes all its power from the computer’s USB interface. You do not need a separate power connection. However, many devices require more energy than this method can provide, and will not work in this type of hub.

But a self-powered Hub (self-powered) takes its power from an external power supply and can therefore provide full power to each port. Many Hub can work as the Hub powered or self-powered bus type.

USB power is allocated in units of 100mA 500mA up to per port. Therefore, a bus powered hub can supply up to four ports and can not offer more than four units of 100mA total power to connected devices (since one unit is required for the Hub in itself). If more power units are required by a device that can be provided by the port, crashes and operating system generally report this to the user.

However, there are many self-powered Hub not on the market that are advertised as self-powered despite really being a fed bus. Also there are plenty of devices that use more than 100mA without announcing this fact (and indeed sometimes without identifying themselves as USB devices at all). These Hub and devices allow more flexibility in the use of energy (particularly many devices use less than 100mA and many USB ports can provide more than 500mA before entering closing by overload) but there may be supply problems worse.

Speed

Self-powered hub (self-powered) takes its power from an external power supply.

To enable high-speed devices operate at its fastest mode all hub between devices and the computer must be high speed. High-speed devices should fall back to full-speed when plugged into a hub full-speed (or connected with an older full-speed port on the computer). While high-speed hub support all device speeds, low and full-speed traffic is combined and secreted from the rapid circulation through a translator of the transaction. Each transaction translator segregates lower speed traffic in their own pool, essentially creating a virtual full-speed bus. Some designs use a single translator of the transaction, while other designs have multiple translators. Having multiple translators is only one significant advantage when connecting high-speed full-width multi-band devices.

It is an important consideration in USB 2.0 common language (and often product marketing) is used as a synonym for high speed. However, because USB 2.0 specification introduced the high speed incorporates and replaces full-speed devices of the USB specification 1.1 compliant low speed or remain a USB 2.0 device. Thus, not all hub USB 2.0 high speed work.

Physical layout

Ports USB in the computer case are usually very close, so that when connecting a device to a port, this can block the adjacent port. This may be a reason to want to use an external USB hub.However, many also have ports hub very close to each other, replicating the problem of the inability to use all ports. The hub called star with each port pointing in a different direction, avoid this problem.

Length limitations

USB cables are limited to 5m. A hub can be used as an active USB repeater to extend the cable length 5m other.

Chip implementation systems

Belkin USB Hub wirelessly.

  • Cypress Semiconductor (multiple TTs)
  • Genesys Logic
  • GL850
  • GL850A – 2.0 TT single, 8-bit RISC, circa 2005
  • GL852 – 2.0, multi TT, 8-bit RISC, circa 2006
  • ProvidesPlug and Play ( ‘plug and run’: the device by simply connecting it recognizes, without special installation) for external devices.
  • They can be connected without the need to restart the computer (hot plug).
  • Wide variety of available devices.
  • Type A: Located on the back and front of the computer.They are rectangular shaped female type. At this port a male connector also connects type A.
  • Type B: They are more square and female type to which a male connector plugs type B.

Features Offered

Connections

  • Type A: Located on the back and front of the computer.They are rectangular shaped female type. At this port a male connector also connects type A.
  • Type B: They are more square and female type to which a male connector plugs type B.