Usb E Xtensions - Opticstar DS-336C XL Setup Manual

It is also worth keeping in mind that normally PCs have two USB controllers,
Each USB controller has two or more USB ports that share a controller's
bandwidth. If you use two cameras, one for guiding and one for imaging, ensure
that the two cameras do not reside on the same USB controller. This is
particularly important when using the camera with laptops.
USB Extensions
The camera comes with an in-situ 2.5 metres USB2.0 cable. The in-situ cable
can be extended by up to 5 metres total with a standard high speed USB 2.0
cable before a special USB2.0 repeater cable is required to further extend the
total length. USB2.0 5 metres repeater cables can be used to extend the total
length to an absolute maximum of 25 metres. The DS-336C XL will function with
standard USB2.0 repeater cables to a typical cable length of 12.5 meters
depending on the type of USB2.0 repeaters used.
USB2.0 repeater cables tend to vary in the way they work. Various devices
including CCD cameras may not function with repeater cables unless the
following installation procedure is followed:
1. Disconnect the camera and USB2.0 repeater cable from the PC.
2. Disconnect the USB2.0 repeater cable from the CCD camera.
3. Connect the USB2.0 repeater cable to the PC without the camera.
4. Wait for the USB2.0 repeater cable to be identified by Windows before
continuing. Repeat steps 3 & 4 if you use additional repeaters.
5. Connect the CCD camera to the USB2.0 repeater cable.
6. Wait for the CCD camera to be identified by Windows.
7. Install the CCD camera drivers as instructed by Windows.
8. Run the camera application software.
Considerably more expensive USB2.0 amplifiers can also be used that offer
better results and considerably longer reach.
USB Port Issues
In practice not all USB ports on desktop PCs and laptops are fully featured. As
such they may affect the operation of your camera. Experience has shown that
USB ports found on the motherboards are the ones closest to the USB standard
and as such provide the maximum power and data transfer speeds required.
In many cases USB hubs found on the front of desktop PCs or as add-on
external units will not supply enough power to devices connected to them
starving such devices of power. This problem in most cases can be overcome by
external USB hubs that use their own mains power supplies. Keep in mind that
powered USB hubs will not extend the reach of a USB cable beyond the 5
metres limit. For that you will need a USB repeater type cable.
15/03/2012
Ä Opticstar Ltd
28
DS-336C XL Setup Guide