Labels:text | screenshot | number | font | colorfulness | parallel | rectangle OCR: STACKING UP FRAME RELAY AND OSI OSI model TCP/IP protocol stack and frame relay Application Presentation Session Transport Data link Physical Figure 1. This diagram depicts the relationship between frame relay and the TCP/IP protocol stack with respect to the OSI model. In a frame relay network, route discovery can be quite different because the intervening routes are deter- mined by Permanent Virtual Circuit (PVC) mapping as opposed to IP subnets.