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A USB header is a group of pins, typically on a computer motherboard or expansion card, to which an internal USB cable can be attached to provide extra USB ports. Typically, one header is a group of two USB ports.
The most common USB header layout is:
5v, D-, D+, Gnd, NC
5v, D-, D+, Gnd, Key
Some may be in reverse order, or completely different, so caution is advised.
Manufacturers generally design USB headers on to their motherboards if they have extra USB ports left over from the design of the rear I/O. Instead of terminating these extra USB ports, they can be left as USB headers to be used by some other means.
Many computer cases feature "Front USB Ports". These front USB ports connect to the USB headers on the motherboard. This is the most common use for USB headers.
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There are several varieties of header pin layouts ranging from 4 pin, to 10 pin, The most common ones are 5 pin for single USB header, to 9 pin for dual USB, where pin 9 and 10 are not used. Pin 9 and blank pin 10 are to ensure the plug is inserted correctly.
Some 9 pin header plugs have different places where the blank pin is and also a different wiring order. You must have the right wiring order and plug for your device, and to your motherboard, or you may do some serious damage to your PC and/or USB devices. It is wise to always double check the pins and wiring via a PC Tech before buying and installing any internal after market USB device.
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Contrast the IPv4 and the IPv6 header fields?
Simplified header format. IPv6 has a fixed length header, which does not include most of the options an IPv4 header can include. Even though the IPv6 header contains two 128 bit addresses (source and destination IP address) the whole header has a fixed length of 40 bytes only. This allows for faster processing. Options are dealt with in extension headers, which are only inserted after the IPv6 header if needed. So for instance if a packet needs to be fragmented, the fragmentation header is inserted after the IPv6 header. The basic set of extension headers is defined in RFC 2460.
Why does the TCP header have a header length field and UDP header does not?
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Minimum bytes in IPv4 header?
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What is the first row of a table in excel?
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What are the different types of headers in football?
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What is the section is used for placing the text that appears in the beginning of every page?
The Header.
A--is text and graphics that print at the top of each page?
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What type of ribbons or data cables would you find in a PC?
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What is meant by function header in java?
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What are the basic elements of an email message?
the email address of the receiver, the header and the message
Where is the header?
2005 fiesta header tank fitting instructions
What option describes objects workbook or worksheet or header?
header
