The Sybase listener default transaction name is SY01. You
may choose a different name.
The Sybase listener listens on a specific port for any incoming TCP connect request. When a request arrives, the listener performs security or logon processing for the request, then passes the TCP socket to the transaction received from the client. There can be more than one instance of a listener in a single CICS region, and each instance listens on a different port number. For three-tier transactions, the listener issues a command to start the transaction specified by the DirectConnect for z/OS Option and pass the associated socket. Then, the Server Option takes the socket through the Server Option API and manages the connection.
