A packet add/drop multiplexer, comprising: a line interface unit, comprising a first line interface, configured to receive a data frame of an input transporting side; and a second line interface, configured to send a data frame of an output transporting side; characterized in further comprising: a scheduling unit, configured to drop the received data frame of the input transporting side, send a first Transmission Container 'T-CONT' data packet in the data frame of the input transporting side to a branch unit, wherein a destination Network Element 'NE' identifier 'ID' of the first T-CONT data packet is a local NE ID; buffer a second T-CONT data packet in the data frame of the input transporting side, and perform a rate adjustment on the buffered second T-CONT data packet, wherein a destination NE ID of the second T-CONT data packet is a non-local NE ID; and at least one branch unit, configured to decapsulate the received first T-CONT data packet, extract a Gigabit-Capable Passive Optical Network 'GPON' Encapsulation Method 'GEM' data packet in the first T-CONT data packet, assemble the GEM data packet in a downstream data frame of the branch unit, and send the downstream data frame to a terminal; extract a GEM data packet in an upstream data frame of the branch unit, encapsulate the GEM data packet in a third T-CONT data packet, and send the third T-CONT data packet to the scheduling unit; wherein the scheduling unit is further configured to perform frame reassembly on the second T-CONT data packet after the rate adjustment and receive the third T-CONT data packet sent by the branch unit, generate the data frame of the output transporting side, and send the data frame of the output transporting side to the second line interface, wherein a source NE ID of the third T-CONT data packet is a local NE ID. a line interface unit, comprising a first line interface, configured to receive a data frame of an input transporting side; and a second line interface, configured to send a data frame of an output transporting side; characterized in further comprising: a scheduling unit, configured to drop the received data frame of the input transporting side, send a first Transmission Container 'T-CONT' data packet in the data frame of the input transporting side to a branch unit, wherein a destination Network Element 'NE' identifier 'ID' of the first T-CONT data packet is a local NE ID; buffer a second T-CONT data packet in the data frame of the input transporting side, and perform a rate adjustment on the buffered second T-CONT data packet, wherein a destination NE ID of the second T-CONT data packet is a non-local NE ID; and at least one branch unit, configured to decapsulate the received first T-CONT data packet, extract a Gigabit-Capable Passive Optical Network 'GPON' Encapsulation Method 'GEM' data packet in the first T-CONT data packet, assemble the GEM data packet in a downstream data frame of the branch unit, and send the downstream data frame to a terminal; extract a GEM data packet in an upstream data frame of the branch unit, encapsulate the GEM data packet in a third T-CONT data packet, and send the third T-CONT data packet to the scheduling unit; wherein the scheduling unit is further configured to perform frame reassembly on the second T-CONT data packet after the rate adjustment and receive the third T-CONT data packet sent by the branch unit, generate the data frame of the output transporting side, and send the data frame of the output transporting side to the second line interface, wherein a source NE ID of the third T-CONT data packet is a local NE ID. a scheduling unit, configured to drop the received data frame of the input transporting side, send a first Transmission Container 'T-CONT' data packet in the data frame of the input transporting side to a branch unit, wherein a destination Network Element 'NE' identifier 'ID' of the first T-CONT data packet is a local NE ID; buffer a second T-CONT data packet in the data frame of the input transporting side, and perform a rate adjustment on the buffered second T-CONT data packet, wherein a destination NE ID of the second T-CONT data packet is a non-local NE ID; and at least one branch unit, configured to decapsulate the received first T-CONT data packet, extract a Gigabit-Capable Passive Optical Network 'GPON' Encapsulation Method 'GEM' data packet in the first T-CONT data packet, assemble the GEM data packet in a downstream data frame of the branch unit, and send the downstream data frame to a terminal; extract a GEM data packet in an upstream data frame of the branch unit, encapsulate the GEM data packet in a third T-CONT data packet, and send the third T-CONT data packet to the scheduling unit; wherein the scheduling unit is further configured to perform frame reassembly on the second T-CONT data packet after the rate adjustment and receive the third T-CONT data packet sent by the branch unit, generate the data frame of the output transporting side, and send the data frame of the output transporting side to the second line interface, wherein a source NE ID of the third T-CONT data packet is a local NE ID.