3Com CoreBuilder 7000 Operation Manual page 232

232 A B: P I
PPENDIX ROTOCOLS AND NTERFACES
errors. It is padded to align to 48 bytes (see Figure 68). To indicate frame
boundaries and determine when to reassemble and when to stop
reassembling, the space bit for Payload Type (PT) in the cell header is zero
except for the last cell in the packet (when it is a one). The cells are
reassembled by looking at the VPI/VCI and, for a given VPI/VCI,
reassembling them into a larger packet (refer to Figure 69). Multiple
conversations may be interleaved on a given connection. An example for
an application that uses the AAL5 is LAN Emulation (refer to Figure 67 for
a summary of the applications used by the various AALs).