FRF.12 is a specification by the Frame Relay Forum Technical Committee, and you can find it at http://www.frforum.com/. This specification enables Frame Relay networks to operate in a manner similar to MCML PPP. Because this fragmentation also happens at the link layer, the upper-layer protocols are not aware of the fragmentation.
As with MCML PPP, packets are fragmented at entry to the WAN network and reassembled when the destination router receives them.
FRF.12 also specifies the interworkings between Frame Relay and ATM. This enables packets fragmented by FRF.12 on the Frame Relay side of the circuit to be reassembled on the ATM side of the circuit.
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