
108 ◾ Enterprise Architecture A to Z
in Figure A3.3.1. Communications services are performed at one or more of these architectural
levels within the geographic components. Figure A3.3.1 shows computing elements (operating at
the applications program level) with supporting data exchange elements, linked with each other
through various switching elements (operating at the network switching level), each located within
its respective geographic component. Figure A3.3.1 also identifies the relationship of e Open
Group Architectural Framework to the communication architecture. e figure also depicts the
External Environment Interface (EEI); as t