Enterprise Architecture, TOGAF and Solution Architects — Quite often people wonder where a Solution Architect fits within the TOGAF Framework and it is not obvious that there is a single answer. I suggest we look first at a generic profile for a Solution Architect. Companies such as Oracle, Cisco, SAP and others have roles called Solution Architect but with little apparent agreement to what that role is.
Read this article - http://soa.sys-con.com/node/1099170
This article gives a good understanding of the various software architecture roles and responsibilities. I got a clear idea of the role of a solution architect as opposed to an enterprise architect.