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Switched Multimegabit Data Service is similar to frame relay in that it is a good protocol for interconnecting LANs. However, it has even less error checking capability. (Is that possible?) It is typically used in metropolitan area networking, but there are a few carriers who offer a long distance SMDS connection capability. The link layer portion of SMDS simply appends some address information in front of the user data and ships the frame. As a WAN junkie, I'm less enamored of this one, but if you want to carry a lot of data across town... Click here to see a representation of the SMDS protocol structure.

SMDS Protocol Structure

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