![]() ![]() ![]() There are other factors, but thats the reason in a nutshell. As you increase the length of the cable, you increase this delay, to such a point where the data ends up completely out of step and meaningless to the other end. What happens when you extend a USB cable is to add a delay in the signals, for example, when a USB sevice wants to send data to the PC, it will do so on the start of the clock pulse, and any data it then sends is kept in step with the clock. The clock is a chain of pulses thats used to synchronise the data between the device and the PC, the data, well its just that. WESAPPINC USB to 25PIN DB25 Parallel Printer Cable Adapter USB to Female Connector IEEE 1284 Converter for Laptop Desktop PC Supports Windows, Mac OS, Linux, 5ft. Two of the cores are for power, +ve and Ground (red and black) the other two, green and white are clock and data (signal). This cable adapter has a standard type-A USB plug. The reason for this is not interference, nor is it voltage drop, but the timing of the signals that USB uses. Sabrent 6ft USB 2.0 to DB25F Parallel Printer Cable (USB-DB25F) Type: Others Connector Number: 2 Specifications: The USB-to-DB25 adapter provides you with an external DB25 female plug-and-play connection for use with computers, notebooks, and handheld computing devices that support USB. To put the record straight, its nothing do do with either of the above, you can have the best cable in the world, even fancy gold plated low resistance stuff, and the chances of getting any appreciable RELIABLE extra distance above the 5 metre limit is virtually zero. This adapter convert the new USB 3.1 interface to traditional USB Type-A interface. ![]() There is a lack of research here, and a lot of misunderstanding about cables, ie twisted pair or shielded etc. ![]()
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