(19)

(11)

EP 2 580 884 A1

(12)

(43) Date of publication: 17.04.2013 Bulletin 2013/16 (21) Application number: 10725666.1 (22) Date of filing: 11.06.2010

(51) International Patent Classification (IPC):  H04J 14/02(2006.01) H04L 27/26(2006.01) (86) International application number: PCT/EP2010/058232 (87) International publication number: WO 2011/154048 (15.12.2011 Gazette 2011/50)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR (71) Applicant: Telefonaktiebolaget L M Ericsson (PUBL) 164 83 Stockholm (SE)	(72) Inventors: PONZINI, Filippo I-43041 Bedonia (PR) (IT) SABELLA, Roberto I-56100 Pisa (IT) (74) Representative: Parkinson, Neil Scott  Ericsson Limited Patent Unit Optical Networks Unit 4 Midleton Gate Guildford Business Park Guildford, Surrey GU2 8SG Guildford, Surrey GU2 8SG (GB)