# Customizing Mainframe HUB Connectivity

To ensure the communication between TIBCO Substation ES and TIBCO Mainframe HUB, you have to customize the HUB connectivity you use.

## Review and edit the HUB parameter file.

This member contains the startup values for the HUB. By default, the HUB-NAME is the LPAR name. CID is a connection ID in the range 1 - 255, and it must be unique for every HUB instance across the sysplex.

Data Set: `USERHLQ.PARM`

Member: `SXXHUB` or `SXXHUBSA`

Where `SXXHUBSA` is for HUB Standalone mode initialization parameters, when Substation ES only uses this HUB for TIBCO Mainframe Logger for CICS or IMS interface.

## Start the Mainframe HUB

This member invokes SXXAHUB to start the TIBCO Mainframe HUB in your system.

Data Set: `USERHLQ.JCL`

Member: `SXXHUB` or `SXXHUBSA`

Where `SXXHUBSA` is for Standalone mode HUB.

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