Question: In UTRAN's Iu interface, as per 3GPP specifications, which ITU-T Recommendation's component is utilized solely for the segmentation and reassembly of AAL2 SDUs?
Option 1: ITU-T Recommendation I.361 - B-ISDN ATM Adaptation Layer (AAL) Specification
Option 2: Service Specific Segmentation and Reassembly (SSSAR) sublayer of ITU-T Recommendation I.366.1
Option 3: ITU-T Recommendation I.365 - Broadband ISDN ATM Adaptation Layer Sublayers
Option 4: ITU-T Recommendation Q.2931 - B-ISDN Signaling ATM Adaptation Layer (SAAL)
Explanation: The correct answer is Option 2 because, according to the specifications, in the context of UTRAN's Iu interface for AAL2 data transport, the Service Specific Segmentation and Reassembly (SSSAR) sublayer from ITU-T Recommendation I.366.1 is specifically employed for segmenting and reassembling AAL2 Service Data Units (SDUs), highlighting its specialized role in this particular application within telecom networks.