TDMA passive optical network OLT system for broadcast service

• US 20080037535A1
• Filed: 12/07/2006
• Published: 02/14/2008
• Est. Priority Date: 12/09/2005
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Park, Sung, Kim, Jong, Lee, Dong, Yoon, Bin, Lee, Mun, Kim, Bong
• Granted Patent: US 7,760,734 B2
• Time in Patent Office: Days
• US Class Current: 370/389
• CPC Class Codes: H04H 20/69 Optical systems
• CPC Class Codes: H04J 3/1694 Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers Passive Optical Networks H04Q11/0062

Abstract

Provided is a TDMA (time division multiple access) PON (passive optical network) OLT (optical line terminal) system for a broadcast service, including packet processor determining information according to types of frames (unicast, multicast, and broadcast frames) and a switch output port using header information (an IP address of a packet header, MAC (multiple access control) addresses of Ethernet frames, and the like) of data received from an external node or the ONT (optical network terminal) and attaching the information to header parts of the frames to generate second data, a switch copying the second data by a predetermined number of times according to a transmission method and transmitting the second data to a corresponding destination output port according to the identification codes, M TDMA PON MAC processors removing the identification codes added to the second data and converting the second data into TDMA PON frames, and M optical transceivers converting the TDMA PON frames into optical signals and transmitting the optical signals to an ONT.

Claims

1. A transmitter of a TDMA (time division multiple access) PON (passive optical network) OLT (optical line terminal) system comprising a larger amount of downstream data transmitted from an OLT to an ONT (optical network terminal) than upstream data transmitted from the ONT to the OLT, the transmitter comprising:

a packet processor determining information about types of frames (unicast, multicast, and broadcast frames) and a switch output port using header information (an IP address of a packet header, MAC (multiple access control) addresses of Ethernet frames, and the like) of data received from an external node or the ONT and attaching the information to header parts of the frames to generate internal frames;

a switch classifying the types of frames and the switch output port according to identification information of the frames received from the packet processor, copying and transmitting broadcast frames to all of M TDMA PON MAC processors, coping and transmitting multicast frames to corresponding switch output ports, and transmitting unicast frames only to a corresponding destination output port;

the M TDMA PON MAC processors receiving the internal frames from the switch and removing the information about the types of frames and the switch output port attached to the frame header in order to convert the internal frames into TDMA PON frames; and

M optical transceivers converting the TDMA PON frames output from the m TDMA PON MAC processors into optical signals and transmitting the optical signals to the ONT.

2. A receiver of a TDMA PON OLT system comprising a larger amount of downstream data transmitted from an OLT to an ONT than upstream data transmitted from the ONT to the OLT, the receiver comprising:

M optical transceivers extracting data from optical signals transmitted in a burst mode in a TDMA PON;

M TDMA PON MAC processors recovering TDMA PON frames from the extracted data;

a switch multiplexing the frames received from the M TDMA PON MAC processors and transmitting the multiplexed frames to a packet processor; and

the packet processor recovering and processing Ethernet frames or packets from received internal frames.

3. A TDMA PON OLT system having an asymmetric optical link speed comprising a downstream optical link speed A and a upstream optical link speed A/n,

wherein a number, M, of TDMA PON MAC processors connected to a packet processor is less than or equal to n.

4. An optical transceiver of a TDMA PON OLT system for a broadcast service comprising:

a packet processor determining whether first data is received as a broadcast, multicast, or unicast based on a header of the first data and adding identification codes for determining an output port to generate second data;

a switch copying the second data by a predetermined number of times and transmitting the second data to a corresponding output port according to the identification codes;

M TDMA PON MAC processors removing the identification codes added to the second data and converting the second data into TDMA PON frames; and

M optical transceivers converting the TDMA PON frames into optical signals and transmitting the optical signals to an ONT.

5. The optical transceiver of claim 4, wherein the first data is one of packet data and Ethernet frame data.

6. The optical transceiver of claim 4, wherein the packet processor adds the identification codes to a reserved header of the first data.

7. The optical transceiver of claim 4, wherein the switch copies data broadcast by the number, M, of TDMA PON MAC processors, and coping data multicast by a number of TDMA PON MAC processors to which the data is to be transmitted.

8. An optical receiver of a TDMA PON OLT system for a broadcast service, comprising:

M optical receivers receiving optical signals having burst mode characteristics, the optical signals transmitted from an ONT and extracting data from the optical signals;

M TDMA PON MAC processors recovering TDMA PON frames from the extracted data;

a switch multiplexing the recovered TDMA PON frames; and

a packet processor recovering one of Ethernet frame data and packet data from the multiplexed frames.