socket-descriptor

Specifies the name of a fullword field containing the socket descriptor on which to listen.

backlog

Specifies the name of a fullword field containing the backlog value. backlog can be specified as an absolute expression. It defines the maximum number of pending connections that may be queued. The value cannot exceed the maximum number of connections allowed by the installed TCP/IP.

z/VSE systems: The BACKLOG parameter is ignored. The installed TCP/IP determines the backlog value for a given socket.