
Configuring Frame Relay Services
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Frame Relay SVC Signaling and LAPF
Figure 1-5 shows the layers of protocol standards for frame relay signaling:
• The LAPF Core layer defines basic frame relay protocol for both PVCs and
SVCs and supports the reliable transfer of multiple numbered frames over
SVCs.
• The DLCMI layer defines link management protocol for PVCs.
• The LAPF and Q.933 layers define link management protocol for SVCs.
Figure 1-5. Frame Relay Signaling and LAPF Standards
The link access procedure, frame mode (LAPF) layer defines five unnumbered
control frames and three numbered supervisory frames on the communications
link.
Q.933 or FR.4
Define link
management
protocol
for SVCs
Defines link
management
protocol
for PVCs
Defines basic
frame relay
protocol common to
PVCs and SVCs
LAPF
LAPF Core
Physical media
DLCMI
FR0018A
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