PASSIVE OPTICAL NETWORK AND TIME DIVISION MULTIPLEXED SYSTEM

摘要

A passive optical network (PON) (Fig 1) carries both telephony and packet based traffic, each in their native format. An optical line terminal (OLT) transmits in a time slot of fixed duration with a provisional number frames of fixed size in one portion of the time slot, and frames of variable size in a remaining portion of the time slot. The OLT determines in real time an integral number of variable size frames that can be transmitted, based on the size of each variable size frame that has been received and is awaiting transmission, and also based on the number of fixed size frames that have been provisioned for the time slot. If an Ethernet frame is being received, but does not fit in the current time slot, then it is sent in the next time slot.