Conversation Types

Personal Communications and Communications Server LU 6.2 supports two types of conversations, mapped and basic, and therefore provides a separate set of verbs for each. The conversation type you use depends on whether you need full access to the SNA general data stream (GDS) as provided by basic conversations. The GDS defines what is known as a GDS variable. A GDS variable consists of one or more logical records. Each logical record begins with a logical length (LL) field that specifies the overall length of the logical record (data). The first logical record of a GDS variable also includes, immediately after the logical length field, an identification (ID) field that specifies the type of GDS variable.