FRF.12
Encyclopedia
The FRF.12 specification describes the method of fragmenting Frame Relay
Frame relay
Frame Relay is a standardized wide area network technology that specifies the physical and logical link layers of digital telecommunications channels using a packet switching methodology...

 frames into smaller frames.

Background

When multiplexing packet data from different virtual circuits or flows, Quality of Service
Quality of service
The quality of service refers to several related aspects of telephony and computer networks that allow the transport of traffic with special requirements...

 concerns often arise. This is because a frame from one virtual circuit may occupy the line for a long enough period of time to disrupt a service guarantee given to another virtual circuit.

Fragmentation

Fragmentation
IP fragmentation
The Internet Protocol implements datagram fragmentation, so that packets may be formed that can pass through a link with a smaller maximum transmission unit than the original datagram size....

is a well known method for addressing this. An incoming long packet is broken up into a sequence of shorter packets and enough information is added to reassemble that long frame at the far end.

FRF.12

FRF.12 is a specification from the Frame Relay Forum which specifies how to perform fragmentation on frame relay traffic in several different scenarios.
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