Our December news release listed below tells about a great resource available online from our advertiser Contemporary Controls

The “ABCs of  the Internet Protocol” Informs Customers on Issues Related to the IP Portion of the TCP/IP Stack as it Applies to Control Networks

Contemporary Controls Publishes the “ABCs of IP (Internet Protocol)”

Downers Grove, Illinois (December 11, 2006) - Contemporary Controls offers engineers a valuable document on the IP (Internet Protocol) portion of the TCP/IP stack as it applies to control networks. This document defines TCP/IP and other topics including data encapsulation, routers and hosts, IP addressing and the IP header.

The IP is responsible for the end-to-end delivery of datagrams over an Internet. It also provides host and network addressing and the means for fragmenting datagrams into manageable packets. IP is a routable protocol and much of its complexity is due to its ability to route packets directly within a local network or indirectly through routers. Routers are not ideal for a control network since they reduce determinism and increase data latency.

Still to accept TCP as a transport layer for an Ethernet control network requires acceptance of IP as well. By understanding the limitations of IP, a control network can still be designed using the TCP/IP family of protocols. This is especially true if the control network is restricted to that of a private or local network.

To receive this FREE valuable resource, visit www.ctrlink.com/pdf/abc15.pdf

This resource is well worth downloading and reading to help your understanding of the TCP/IP STACK.

Actually TCP/IP is a set of protocols defined by a series of RFCs (request for comments) that have evolved over the years. In general the Internet Protocol (IP) is used to route messages between networks and, therefore, properly resides at the network layer of the OSI Reference Model. Transmission Control Protocol (TCP) sits on top of IP and is used to guarantee the delivery of messages. Above TCP is the application layer.  The services of the presentation and session layers of the OSI Reference Model are incorporated into the application layer. Therefore, the reference model for TCP/IP-based systems actually consists of only five layers. Technologies such as Ethernet II and IEEE 802.3 reside at the lower data link and physical layers of the same model.

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