Starting node communication using SNA/VTAM

To start node communication using SNA/VTAM:

Enter the MVS™ commands necessary to start VTAM® (S VTAM and VTAM VARY)
Enter the $S LOGON(n) command to start the JES2/VTAM interface
Enter the $S LINE(nnnn) to start the specified NJE line(s)
Enter the $S N command to start a session with another node, specifying the name of the application with which the session is started on the A= parameter.

The following describes each of these commands in more detail:

Starting VTAM

The MVS S VTAM command starts the network controllers or communication links needed to establish a path to the remote workstation and the physical unit. The MVS VTAM VARY command activates the logical unit associated with the workstation. This activation can also be accomplished by an automatic activation specified in the VTAM network definition.

For information about starting VTAM and activating the network, refer to z/OS Communications Server: SNA Operation, .

Starting the JES2/VTAM interface

Issuing the $S LOGON(n) command allows JES2 to begin processing connection requests from SNA remote workstations. Use the value of n specified in the LOGON(n) initialization parameter for the interface to be started.

Starting the specified NJE lines

Use the $S LINE(nnnn) command to start the specified NJE lines. You must know how the systemprogrammer defined your NJE network in the JES2 initialization procedure; that is, you must know which workstations can use which lines. Ask your system programmer for this information. JES2 cannot be withdrawn from the system until all lines are drained.

Starting an SNA session

The $S N,A= command starts an SNA application-to-application session with another node. The optional LINE(nnnn) parameter identifies the started logical line to be used for the session. The physical SDLC line(s) involved will be managed by VTAM and the Network Control Program (NCP). If you do not identify the line to be used, an SNA logical line will be selected from a pool of available, idle SNA logical lines. At least one SNA line must be available to establish an SNA session. If you specify a currently-used or drained line, the command is rejected.

Use the A= parameter to provide the name of the application with which an SNA application-to-application session is to be started. This application name corresponds to the APPLID= value on the LOGON(nnn) initialization statement at the node with which a session is desired.

If a node consists of more than one member, each member of that node must be uniquely defined as an application to VTAM and the application names used must be defined to JES2 with APPL initialization statements. APPL initialization statements must be supplied at every node in the network that may initiate SNA sessions with these applications.