© 2016 Thorlabs Scientific Imaging60
DCx Camera Functional Description and SDK Manual
2.9.4 USB 3.0 Cabling and Connectors
In order to comply with the specifications, the maximum length of USB 3.0 cables is limited to 3-
8 m. With the use of repeaters cable lengths up to 20 m are possible. With signal conversion into
optical signals cable lengths up to 100 m are possible. The USB bus provides power supply with
5 V and 900 mA max.
Cable design
The following illustration shows the basic design of a shielded USB cable:
SSTX+/-: SuperSpeed Transmit (data transfer from host to the device)
SSRX+/-: SuperSpeed Receive (data ransfer from device to the host)
D+/D-: data transfer (USB 2.0)
+5 V/GND: power supply
Basic design of a USB 3.0 cable
Connector types
On the PC side, USB 3.0 cables are equipped with a standard A type plug (8 pins) and on the
device side either with a standard B plug or a micro-B plug.
While a USB 3.0 standard A plug and a USB 2.0 port can be used together (with the restriction that
only USB 2.0 speed is possible), the standard B and micro B plug are no longer compatible with
USB 2.0 ports.
2.9.5 Data Transmission and Bandwidth
USB 2.0
The USB 2.0 standard specifies an overall bandwidth of 480 Mbit/s shared between different
transmission modes. DCx Cameras use the USB 2.0 bulk mode for transmitting images. This
mode uses error correction to ensure correct delivery of the image data, but does not guarantee a
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