The main functions of X2 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 36.421 -
Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 layer 1