What are the pros and cons between TRIM 7, 7-Layer, and stack with TCP/IP?
The TRIM 7 protocol saves some bandwidth on the wire, but most of the savings are really just during connection establishment. In the OSI MMS profile, there is really very little protocol overhead to layers 5-7 during the operational phase of a connection. It could also save some code space, although (at least in our implementation) the minimal subset of layers 5 and 6 required for MMS take up very little code space anyway. We recommend including both into every product – the minimal code space required allows for much more product flexibility, and eliminates a major headache in product configuration and support in the field. The TCP/IP stack has the primary advantage of being free on most desktop systems. There are two issues to consider, however: 1) While TCP/IP is free on the desktop systems, it is far from free on most embedded platforms. Unless you happen to use pSOS or VxWorks, you will likely have to buy a license for TCP/IP. While there are many TCP/IP product offerings, most a
