ZCOM Subsystem
ZCOM Concepts
ZCOM Concepts
Throughout this manual, references are made to terminal ZLU or just terminal. This does not mean a physical terminal device type but is a generic term that can refer to any kind of physical or logical entity.
Examples of physical entities are printers, an HDLC link, terminals, etc. Examples of logical entities might be an X.25 Permanent or Switched Virtual Circuit.
In the ZCOM Subsystem, messages are sent directly from sender to receiver (where the receiver is another program or a terminal ZLU). They are routed using a pointer called a ‘ZLU’ which stands for ‘ZCOM Logical Unit’. ZCOM uses the ZLU for its addressing mechanism. A ZLU may represent a terminal (for instance, an X.25 virtual circuit) or an application program. Messages are sent to and received by ZLUs.
Chapter 1 | 17 |