FTTB Fiber to The Building 光纤到楼 
FTTC Fiber to The Curb 光纤到路边 
FTTH Fiber to The Home 光纤到家 
FTTO Fiber to The Office 光纤到办公室 
FSA Fiber to the Serving Area 光纤到服务区 

FTTB FTTC FTTH FTTO FSA