Introduction to DLPI
DLPI Services
Figure 1-15 Message Flow: DLS Provider Rejection of a Connection Establishment Attempt
DL_CONNECT request
DL_DISCONNECT indication 
Figure 1-16 through Figure 1-18 illustrate the situation where the calling DLS user chooses to abort a previous connection attempt. The DLS user issues DL_DISCONNECT_REQ at some point following a DL_CONNECT_REQ. The resulting sequence of primitives depends on the relative timing of the primitives involved, as defined in the following time sequence diagrams.
Figure 1-16 Message Flow: Both Primitives are Destroyed by Provider
DL_CONNECT request
DL_DISCONNECT request
DL_OK acknowledge
Figure 1-17 Message Flow: DL_DISCONNECT Indication Arrives before DL_CONNECT Response is Sent
DL_CONNECT
request |
| |
DL_DISCONNECT | DL_CONNECT | |
indication | ||
request | ||
| ||
DL_OK | DL_DISCONNECT | |
acknowledge | indication |
38 | Chapter 1 |