IBM Support

Understanding the BACKLOG parameter on the CICS TCPIPSERVICE definition

Question & Answer


Question

You are setting up a TCPIPSERVICE definition in CICS Transaction Server for z/OS (CICS TS), and need to understand the BACKLOG parameter. You want to know under what circumstances would a connection become queued? Would this only happen if multiple connections were started at the same time, and are single-threaded on the QR TCB?

[{"Product":{"code":"SSGMGV","label":"CICS Transaction Server"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Component":"TCPIP","Platform":[{"code":"PF035","label":"z\/OS"}],"Version":"4.1;4.2;5.1;5.2;5.3","Edition":"","Line of Business":{"code":"LOB70","label":"Z TPS"}}]

Log InLog in to view more of this document

This document has the abstract of a technical article that is available to authorized users once you have logged on. Please use Log in button above to access the full document. After log in, if you do not have the right authorization for this document, there will be instructions on what to do next.

Product Synonym

CICS/TS CICS TS CICS Transaction Server

Document Information

Modified date:
08 October 2025

UID

swg21394849