![](/images/new-backgrounds/1319792/31979271x1.webp)
Introduction to DLPI
DLPI Services
Figure 1-12 Message Flow: Successful Connection Establishment
DL_CONNECT request
DL_CONNECT confirm
DL_CONNECT indication
DL_CONNECT response
DL_OK acknowledge
Once the connection is established, the DLS users may exchange user data using DL_DATA_REQ and DL_DATA_IND.
The DLS user may accept an incoming connect request on either the stream where the connect indication arrived or at an alternate, responding stream. The responding stream is indicated by a token in the DL_CONNECT_RES. This token is a value associated with the responding stream and is obtained by issuing a DL_TOKEN_REQ on that stream. The DLS provider responds to this request by generating a token for the stream and returning it to the DLS user in a DL_TOKEN_ACK.
Connection Handoff
Connections may be established on a stream other than that which received the DL_CONNECT_IND by passing a
The normal sequence of messages for obtaining a token is illustrated in Figure
36 | Chapter 1 |