Nov yog qhov tseem ceeb tshaj plaws ROADM qauv ntawm kev ua lag luam ntawm tam sim no. Raws li pom hauv daim duab 2, nws sab UNI yog tsim ntawm 1 × N chaw nres nkoj WSS, thiab UNI sab yog ua los ntawm multicast optical hloov MCS. Ib qhov hloov M × N chaw nres nkoj MCS muaj M tswv yim chaw nres nkoj thiab N cov chaw nres nkoj tawm, thiab tau tsim ntawm M 1 × N chaw nres nkoj kho qhov muag (PS) thiab NM port 1 chaw nres nkoj kho qhov muag (OSW). Lub teeb liab kho qhov muag yog cov tswv yim los ntawm ib qho ntawm cov chaw nres nkoj nkag, thiab tau muab faib ua N xub thawj los ntawm lub tshuab hluav taws xob sib cais, thiab tshaj tawm rau txhua qhov N ntawm qhov hloov pauv; tom qab ntawd kho qhov hloov chaw coj mus rau cov phiaj xwm chaw nres nkoj xaiv xaiv tau txais cov cim teeb liab, thiab lwm cov khoom siv kho qhov muag tsis lees paub nws teeb liab.
Raws li cov haujlwm ntawm 1 × N chaw nres nkoj WSS thiab MCS, ROADM tus qauv no tuaj yeem paub CDC lub luag haujlwm. Txawm li cas los xij, kho qhov muag splitter nyob hauv MCS ua rau muaj qhov ploj ntau dhau thaum uas faib thiab tshaj tawm, yog li ntawd yuav tsum tau siv lub tshuab hluav taws xob ntxiv kom ntxiv rau lub zog kho qhov muag. Nws tseem kim kom tsim kho qhov muag teeb amplifier.