By Jan Axelson
Bringing jointly components of desktop technology—networking and embedded systems—this developer's consultant bargains suggestions and examples for every of those, with a spotlight at the precise requisites and boundaries of embedded structures. simply because constructing an embedded process for networking calls for wisdom from many parts, together with circuit layout, programming, community structure, and Ethernet and net protocols, builders are given necessary technical details on every one that may be placed to take advantage of without delay. coated are the benefits and bounds of utilizing Ethernet to attach embedded platforms in an area community, and application code had to attach an embedded process to an Ethernet community and the web, and the way to construct a community. additionally mentioned are how embedded platforms can use TCP/IP and comparable protocols and the way personal-computer purposes can use the protocols to speak with embedded platforms. builders will find out how their internet server's pages can contain dynamic, real-time content material and reply to person enter.
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Extra info for Embedded Ethernet and Internet Complete
The 802 signifies that the standard relates to local or metropolitan area networking, and x represents one or more digits that identify the specific standard. The Ethernet standard is one of several 802-series standards that define alternate approaches for a network’s physical layer and method of media-access control, which defines how computers share a network. The physical layer described in the standard includes the electrical specifications of the transceivers and the electrical and physical specifications of the connectors and cables.
If the value is less than or equal to 1500 decimal (5DCh), the value indicates length. The data field must contain between 46 and 1500 bytes. If there are less than 46 bytes of valid, or usable, data, the length field can indicate how many of the bytes are valid data. If the value is greater than or equal to 1536 decimal (600h), the Length/Type field indicates the protocol that the contents of the data field use. org) specifies values for different protocols. The value for the Internet Protocol (IP) is 800h.
The value varies with the wire diameter, the spacing of the wires in relation to each other in the cable, and the insulation type. A line’s physical length has no effect on its characteristic impedance. There are techniques for calculating or measuring characteristic impedance, but you shouldn’t have to resort to these. Cable manufacturers specify the characteristic impedance of cables suitable for networking. Category 3 through Category 6 cable all have 100-ohm characteristic impedance. Using cable with a different characteristic impedance can degrade signal quality and result in data errors.
Embedded Ethernet and Internet Complete by Jan Axelson