name: M3UA
full_form: SS7 MTP3 User Adaptation Layer
context: If no timer T1 is active: - the timer T1 shall be started when a MAC-hs PDU with TSN > next_expected_TSN is correctly received. - T1_TSN shall be set to the TSN of this MAC-hs PDU. If a timer T1 is already active: - no additional timer shall be started, i.e. only one timer T1 may be active at a given time. The timer T1 shall be stopped if: - the MAC-hs PDU with TSN = T1_TSN can be delivered to the disassembly entity before the timer expires. When the timer T1expires and T1_TSN > next_expected_TSN: - all correctly received MAC-hs PDUs with TSN > next_expected_TSN up to and including T1_TSN-1 shall be delivered to the disassembly entity; - all correctly received MAC-hs PDUs up to the next not received MAC-hs PDU shall be delivered to the disassembly entity. - next_expected_TSN shall be set to the TSN of the next not received MAC-hs PDU. When the timer T1 is stopped or expires, and there still exist some received MAC-hs PDUs that can not be delivered to higher layer: - timer T1 is started
description: The SS7 MTP3 User Adaptation Layer (M3UA) is a protocol used for interworking between SS7 and SigTran networks. It enables the adaptation of MTP-3 users, such as BICC, to use SCTP instances, allowing multiple users to share the same instance. This facilitates communication between different signalling users, including SCCP users like RANAP, without requiring interworking.
explanation: M3UA is classified as a Protocol because it defines the rules and format for communication between SS7 and SigTran networks, enabling interoperability and data exchange.
section_title: 6.7.6.2	Interworking in SS7 and SigTran Networks
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