scope:

The present document provides test suite structure and test purposes for testing Data Link layer in a Terminal Equipment implementing the Short Message Service (SMS) for PSTNASDN, UBS Protocol 2 according to ES 201 912 [i].

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 Data Link messages in the voice-band connection using the FSK signalling as defined in EN 300 659-2 [3] and ES 200 778-2 [6]. Tests for the FSK signalling are also outside the scope of the present document.

Terminal Equipment implementing the Short Message Service (SMS) for PSTNASDN according to UBS Protocol 2 are required to implement the Transfer Layer according to ES 20 1 9 12 [i]. Using the Remote Single Layer Embedded Test Method (see ISO/IEC 9646-2 [9]) for the UBS Protocol 2 Data Link layer , Transfer Layer messages appear here only as octet string parameters of Data Link layer messages. Tests for the Transfer Layer are not within the scope of the present document.

Figure 1 gives an overview of the reference architecture used for the UBS Protocol 2 operation. Figure 2 shows the configuration used for testing.

ISO/IEC 9646-1 [8] and ISO/IEC 9646-2 [9] are used as the basis for the test specification methodology.