Ethernet access device and Ethernet access method

1. An Ethernet access device, located between a plurality of access nodes and a gateway equipment, comprising at least two downlink physical port units, a multiplex/demultiplex unit and an uplink physical port unit, wherein:

the downlink physical port unit is adapted to perform a conversion between a low-speed physical layer signal input to or output from the access device and a low-speed physical layer load carried in the low-speed physical layer signal;

the uplink physical port unit is adapted to perform a conversion between a high-speed physical layer signal input to or output from the access device and a high-speed physical layer load carried in the high-speed physical layer signal; and

the multiplex/demultiplex unit is adapted to perform a multiplex or a demultiplex for the low-speed physical layer load of the downlink physical port unit and the high-speed physical layer load of the uplink physical port unit according to a tag in the physical layer load corresponding to the downlink;

wherein the multiplex/demultiplex unit comprises a tag storage module, a tag module and a code stream multiplex module, wherein:

the tag storage module is adapted to store the tag and the correlation between the tag and the downlink physical port unit;

the tag module is adapted to add the tag corresponding to the downlink physical port unit to the low-speed physical layer load input from the downlink physical port unit and output the low-speed physical layer load to the code stream multiplex module, and remove the tag from the physical layer load input from the code stream multiplex module and output the low-speed physical layer load to the downlink physical port unit corresponding to the tag; and

the code stream multiplex module is adapted to perform a conversion between the low-speed physical layer load of the tag module and the high-speed physical layer load of the uplink physical port unit.

2. The Ethernet access device according to claim 1 , wherein, the tag is a field in a data frame in the physical layer load, and the field has a correlation with the downlink physical port unit;

the multiplex/demultiplex unit comprises a tag storage module and a frame multiplex module, wherein:

the tag storage module is adapted to store the tag and the correlation between the tag and the downlink physical port unit corresponding to the tag; and

the frame multiplex module is adapted to convert the low-speed physical layer load input from the downlink physical port unit into the high-speed physical layer load in the unit of the data frame and output the high-speed physical layer load to the uplink physical port unit, and convert the high-speed physical layer load input from the uplink physical port unit into the low-speed physical layer load in the unit of the data frame and output the low-speed physical layer load to the downlink physical port unit corresponding to the tag.

3. The Ethernet access device according to claim 1 , wherein, the tag module adds the tag to or removes the tag from the physical layer load in the unit of the data frame or in the unit of a code stream with a fixed length.

4. The Ethernet access device according to claim 1 , wherein, the multiplex/demultiplex unit performs the multiplex and demultiplex periodically according to a time sequence period, and the time sequence period comprises time slots corresponding to the downlink physical port units.

5. The Ethernet access device according to claim 4 , wherein, lengths of the time slots corresponding to the downlink physical port units in the time sequence period are the same;

the multiplex/demultiplex unit comprises a time sequence storage module and a fixed length multiplex module, wherein:

the time sequence storage module is adapted to store the correlation between the time slot in the time sequence period and the downlink physical port unit; and

the fixed length multiplex module is adapted to convert the low-speed physical layer load received from the downlink physical port unit into the high-speed physical layer load on one channel and output the high-speed physical layer load on one channel to the uplink physical port unit in each time slot, and convert the high-speed physical layer load received from the uplink physical port unit into the low-speed physical layer load and output the low-speed physical layer load to the downlink physical port unit in each time slot.

6. The Ethernet access device according to claim 4 , wherein, the multiplex/demultiplex unit comprises a time sequence and time length storage module and a variable length multiplex module, wherein:

the time sequence and time length storage module is adapted to store the length of the time slot in the time sequence period and the correlation between the time slot and the downlink physical port unit; and

the variable length multiplex module is adapted to convert the low-speed physical layer load which is received from the downlink physical port unit and has a code stream length matching the time slot length, into the high-speed physical layer load on one channel and output the high-speed physical layer load to the uplink physical port unit in each time slot, and convert the high-speed physical layer load received from the uplink physical port unit into the low-speed physical layer load and output the low-speed physical layer load which has the code stream length matching the time slot length, to the downlink physical port unit in each time slot.

7. A method for Ethernet access, comprising:

multiplexing physical layer loads carried in physical layer signals of at least two access nodes into physical layer load on one channel, the process of multiplexing the physical layer loads of the access node into the physical layer load on one channel comprises: multiplexing the multiple physical layer loads from the access node into physical layer load groups; and

multiplexing each physical layer load group directly or multiplexing each physical layer load group after regrouping, till the physical layer loads are multiplexed into the physical layer load on one channel;

converting a multiplexed physical layer load into a high-speed physical layer signal, and then transmitting the high-speed physical layer signal in uplink;

demultiplexing the multiplexed physical layer load on one channel carried in the downlink high-speed physical layer signal into physical layer loads corresponding to at least two access nodes, the process of demultiplexing the multiplexed physical layer load on one channel into physical layer loads corresponding to the access nodes comprises: demultiplexing the multiplex physical layer load into multiple physical layer loads; and re-demultiplexing each physical layer load demultiplexed, till the multiplexed physical layer load on one channel is demultiplexed into physical layer loads corresponding to the access nodes; and

converting demultiplexed physical layer loads into low-speed physical layer signals, and then transmitting the low-speed physical layer signals in downlink;

wherein, before each multiplexing, further comprises: adding an offset tag having a one-to-one correlation with each physical layer load in current multiplexing, to the physical layer load before multiplexing;

performing the demultiplexing according to the offset tag having the one-to-one correlation between the physical layer load after demultiplexing and the physical layer load before demultiplexing; and

during the demultiplexing, the method further comprises: removing the offset tag for performing the demultiplexing from the physical layer load.

8. The method for Ethernet access according to claim 7 , wherein, before multiplexing the physical layer loads, the method further comprises: adding a tag having a correlation with the access node, to the physical layer load of the access node;

performing the process of demultiplexing the physical layer load on one channel into multiple physical layer loads according to the tag having the correlation with the access node in the physical layer load; and

before converting the physical layer load corresponding to the access node into a low-speed physical layer signal, the method further comprises: removing the tag from the physical layer load corresponding to the access node.

9. The method for Ethernet access according to claim 7 , wherein, the multiple physical layer loads are multiplexed into physical layer load on one channel periodically according to a time sequence period; the time sequence period comprises a time slot corresponding to the physical layer load before multiplexing; physical layer loads before multiplexing are output as the multiplexed physical layer load on one channel in the time slot, and the length of the physical layer load before multiplexing matches the length of the time slot;

the physical layer load on one channel is demultiplexed into multiple physical layer loads periodically according to a time sequence period; the time sequence period comprises a time slot corresponding to a demultiplexed physical layer load, and the physical layer load whose code stream length before demultiplexing matches the time slot length is output as the physical layer load after demultiplexing in each time slot.

10. The method for Ethernet access according to claim 7 , wherein, demultiplexing physical layer load on one channel into multiple physical layer loads is performed according to a field in the data frame of the physical layer load having the correlation with the access node.