Module-ka indho-indheynta waa aalad beddelka signalka sawir-qaadista, kaas oo la geliyo qalabka gudbinta signalada shabakada sidarouter, furayaasha, iyo qalabka gudbinta. Calaamadaha korantada iyo kuwa indhaha labaduba waa calaamadaha hirarka magnetic. Baaxadda gudbinta calaamadaha korantada ayaa xaddidan, halka ishaarada indhaha lagu kala qaadi karo si dhaqso ah oo fog. Si kastaba ha noqotee, qaar ka mid ah aaladaha hadda jira waxay aqoonsadaan calaamadaha korantada, sidaas darteed waxaa jira qaybo beddelaad koronto ah.
Sababtoo ah xawaaraha sare ee xawaaraha sare iyo fogaanta gudbinta dheer ee gudbinta fiilada indhaha, halka fogaanta gudbinta fiilada dhaqameedku ay gaaban tahay oo u nugul faragelinta elektromagnetic, si loo kordhiyo masaafada gudbinta isgaarsiinta, fiber indhaha ayaa asal ahaan loo isticmaalaa gudbinta. Iyada oo ka qaybqaadashada modules-yada indhaha, calaamadaha korantada waxaa loo rogi karaa calaamadaha indhaha si loogu gudbiyo fiilooyinka indhaha, ka dibna laga beddelo calaamadaha indhaha oo loo beddelo calaamadaha korantada si ay u helaan qalabka shabakada, taas oo kordhinaysa masaafada gudbinta ee isgaarsiinta dhijitaalka ah.
Mabda'a shaqada ee moduleka indhaha ee dhamaadka gudbinta waa in la geliyo calaamad koronto leh oo leh heerka kood gaar ah iyada oo loo marayo terminalka farta dahabka ah, ka dibna u kaxee laser si uu u soo diro signalka indhaha ee heerka u dhigma ka dib markii uu farsameeyo chip darawalka ;
Mabda'a shaqada ee dhamaadka helitaanka waa in loo beddelo calaamadda indhaha ee la helay oo loo beddelo signalka korantada iyada oo loo marayo qalabka wax baaraha, ka dibna loo beddelo signalka daciifka ah ee hadda la helay signalka korantada ee cod-weyneeye ku-meel-gaar ah, oo kor u qaadaya signalka korantada, ka dibna meesha laga saarayo kororka signal by amplifier xaddidaya. Digniinta korantada sare ama hooseysa waxay ka dhigtaa calaamadda korantada ee wax soo saarka mid deggan.