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Yes, frame relay relays packets at the Data Link layer (Layer 2) of the Open Systems Interconnection (OSI) model rather than at the Network layer. A frame can incorporate packets from different protocols such as Ethernet and X.25. It is variable in size and can be as large as a thousand bytes or more. Here's more on OSI: http://searchnetworking.techtarget.com/gDefinition/0,294236,sid7_gci212725,00.html
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