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1. (WO2014196909) NETWORK UNIT AND METHOD FOR MONITORING A FIBER LINE

Pub. No.:    WO/2014/196909    International Application No.:    PCT/SE2013/051109
Publication Date: Fri Dec 12 00:59:59 CET 2014 International Filing Date: Wed Sep 25 01:59:59 CEST 2013
IPC: H04B 10/07
H04B 10/071
H04J 14/02
Applicants: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
Inventors: VALL-LLOSERA, Gemma
DORTSCHY, Boris
URBAN, Patryk
Title: NETWORK UNIT AND METHOD FOR MONITORING A FIBER LINE
Abstract:
Embodiments herein relate to a method in a network unit (14) for monitoring a fiber line between a radio base station (10) and a radio head (12) in a Fiber to the Radio Head communications network. The Fiber to the Radio Head communications network comprises a ring architecture or a tree architecture of fiber, with Subcarrier Multiplexing, SCM, downstream transmissions and Wavelength Division Multiplexing, WDM, upstream transmissions. The monitoring comprises that the network unit(14) detects an indication of a fault along the fiber line based on monitoring power. The network unit(14) initiates, in response to detect the indication, an Optical x Domain Reflectometry, OxDR, measurement over the fiber line. Additionally, the network unit analyses a trace from the OxDR measurement for localizing the fault or for deciding that the indicated fault is not a fault along the fiber line.