rspo/tcp/timeout/read is a SAP Parameter attribute which is used to control Read timeout information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
This parameter specifies the allowed wait time for the completion of a
READ operation on a remote LPD/SAPLPD. If this wait time is exceeded,
the system reports that the READ operation has failed.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.