Dear all,
CA Spectrum install process is implemented using 2 components - the backend component which is running on the destination host (socalled Spectrum Remote Administration service / SRADmin) - and the frontend component which could be the GUI-tool or the cmd-line tool (sdic* / distinst*). The frontend tool will connect via TCP to the destination host enable session to the "SRAdmin"-service which is then applying the initial install or the upgrade to the existing install.
Using the cmd-line frontend tool will allow to do the very same and is full featured. This will allow to install and manage servicepack apply to a remote host when this host is "only accessible via network" - and is not able to provide a desktop / GUI-environment.
In practice this allows to make use of one (i.e. Windows workstation - running Win7 or 10) to do initial install on any remote host for a Spectrum base install. But - as said - you can also do the base-install fully batch-processed.
For initial install this clearly requires to have "SRAdmin"-service installed first - which is also possible per cmd-line/batch-install. See: SRAdmin Installation Methods - CA Spectrum - 10.2 to 10.2.2 - CA Technologies Documentation
See also here:
Installing CA Spectrum in a Distributed Environment - CA Spectrum - 10.2 to 10.2.2 - CA Technologies Documentation - covering more info how to apply per batch to "full multi-host DSS install".
hth, Joerg