scope:

The present document specifies the functional tests in TTCN for the Transfer Layer in a Terminal Equipement implementing the Short Message Service (SMS) for PSTN/ISDN, UBS Protocol 2, according to ES 201 912 [1] at the user/network interface.

Basic ISDN or PSTN call procedures apply in order to establish a circuit-switched band connection between such Terminal Equipment and an SM-SC. Tests for these procedures are outside the scope of the present document. UBS2 terminals send and receive TL messages in the voice-band connection using the FSK signalling as defined in EN 300 659-2 [2] and ES 200 778-2 [3] and DLL services defined in clause 6 and annex B of ES 201 912 [1].

Tests for the Physical Layer of the FSK signalling are outside the scope of the present document. Tests for the DLL of USB 2 terminal have been defined in ES 202 912-5 [5].

Terminal Equipment implementing the Short Message Service (SMS) for PSTN/ISDN according to USB Protocol 2 are required to implement the Transfer Layer according to clause 6 and annex B of ES 201 912 [1]. Transfer Layer messages used in this test specification are structed accordingly.

As the term 'functional tests" indicates, the present document is no conformance test specifiation: a comprehensive coverage of functions and TL protocol features is not attempted. Only the main functions and TL procedures related to outgoing SM-calls (from the SM-TE) and incoming SM-calls (to the SM-TE) are tested.

The Abstract Test Suite designed in the document is based on the test cases specified in tabular form combined with prose in ES 202 912-9 [6]. The Remote Single Layer Embedded Test Method (see ISO/IEC 9646-2 [8]) is applied for the UBS Protocol 2 functional tests.

- The overall test suite structure.

- The testing architecture.

- The test methods and PCO definitions.

- The test configuration.

- TTCN styles and conventions.

- The design principles, assumptions, and used interfaces to the TTCN tester (e.g. ASPs).

- Information about the services assumed from the Data Link Layer and the Physical Layer.

- Interrlationships and dependencies between timeout values.

- The partial PIXIT proforma.

- The TTCN.MP and TTCN.GR forms for the mentioned protocols tests.

While ISO/IEC 9646-1 [7] and ISO/IEC 9646-2 [8] have been used as the basis for the test specification methodology, the ATS contained in the present document has been specified using TTCN-2++ 9TR 101 666 [9]). 

Two forms of the ATS are provided (see annex A):

- The TTCN Graphical form (TTCN.GR),

- The TTCN Machine Processable form (TTCN.MP).