name: SONET
full_form: Synchronous Optical Networking
context: In Downlink, the following connections between logical channels and transport channels exist: - BCCH can be mapped to BCH; - BCCH can be mapped to FACH; - BCCH can be mapped to HS-DSCH (in FDD and 1.28 Mcps TDD mode only); - PCCH can be mapped to PCH; - PCCH can be mapped to HS-DSCH (in FDD and 1.28 Mcps TDD mode only); - CCCH can be mapped to FACH; - CCCH can be mapped to HS-DSCH (in FDD and 1.28 Mcps TDD mode only); - DCCH can be mapped to FACH; - DCCH can be mapped to DSCH (in TDD mode only); - DCCH can be mapped to HS-DSCH; - DCCH can be mapped to DCH; - MCCH can be mapped to FACH; - MSCH can be mapped to FACH; - DTCH can be mapped to FACH; - DTCH can be mapped to DSCH (in TDD mode only); - DTCH can be mapped to HS-DSCH; - DTCH can be mapped to DCH; - CTCH can be mapped to FACH; - MTCH can be mapped to FACH; - SHCCH can be mapped to FACH (in TDD mode only); - SHCCH can be mapped to DSCH (in TDD mode only). The mappings as seen from the UE and UTRAN sides are shown in Figure 4 and
description: SONET (Synchronous Optical Networking) is a standard for synchronous data transmission on optical media. It provides a high-speed, synchronous transmission protocol that enables the efficient transfer of large amounts of data over long distances. In 3GPP TS 25.411, SONET is considered an option for Layer 1 Synchronised transmission, specifically referencing STS-12c (622 Mb/s) and STS-3c (155 Mb/s) interfaces according to ANSI standards.
explanation: SONET is classified as Technology because it defines a specific standard for synchronous data transmission using optical media. Its application in Layer 1 Synchronised transmission, along with the mention of specific interfaces and standards, reinforces its categorization as a technological concept.
section_title: 4.2.1	Layer 1 Synchronised
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