S1 layer 1

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the main functions of S1 interface layer 1 are as following:
·         Interface to physical medium;
·         Frame delineation;
·         Line clock extraction capability;
·         Layer 1 alarms extraction and generation;
·         Transmission quality control.
Protocol specification
3GPP TS 36.411 - Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 layer 1


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