HP 800 HP DLPI Programmer's Guide - Page 34

Introduction to DLPI DLPI Services NOTE Figure 1-3 DLS users must issue only one DLPI request at a time. They must wait for the acknowledgement for the issued primitive before issuing the next request. Local Management Services The local management services apply to the connection and connectionless modes of communication. These services, which fall outside the scope of standards specification, define the method for initializing a stream that is connected to a DLS provider. DLS provider information reporting services are also supported by local management facilities. Information Reporting Service This service provides information about the DLPI stream to the DLS user. The message DL_INFO_REQ requests the DLS provider to return operating information about the stream. The DLS provider returns the information in a DL_INFO_ACK message as shown in Figure 1-3. Message Flow: Information Reporting DL_INFO request DL_INFO acknowledge Attach Service The attach service assigns a physical point of attachment (PPA) to a stream. This service is required for style 2 DLS providers to specify the physical medium over which communications will occur. The DLS 34 Chapter 1