Full duplex transmission method
High speed data communication standards such as IEEE 802.3ae (also known as XAUI) use four lanes to transmit data half duplex at 10 Gb/s. In order to achieve full duplex, eight lanes need to be used. By introducing echo cancellers into the system, a high speed transceiver can be built with full duplex capability on four lanes, thereby saving 50% of the lane requirements when compared to XAUI while still maintaining a low symbol rate.
1 . A data transmission system comprising:
a first transceiver;
a second transceiver; and
at least one data lane connecting the first and second transceivers,
where each transceiver has an echo canceller.
2 . The system of claim 1 , wherein the at least one lane travels through a backplane.
3 . The system of claim 1 , wherein the at least one lane comprises a trace on a printed circuit board.
4 . The system of claim 1 , wherein data transmission on the at least one lane is full duplex.
5 . The system of claim 1 , wherein data transmission speed is at least 10 gigabits per second.
6 . The system of claim 1 , wherein a data signal comprises a pulse amplitude modulated signal with at least four levels.
7 . The system of claim 1 , wherein the at least one data lane comprises one signal pair of traces with a symbol rate of at least 6.25 gigabits per second.
8 . The system of claim 1 , wherein the at least one data lane comprises two signal pair of traces, each pair having a symbol rate of at least 3.125 gigabits per second.
9 . The system of claim 1 , wherein the at least one data lane comprises four signal pair of traces, each pair having a symbol rate of at least 1.5625 gigabits per second.
10 . The system of claim 1 , wherein the echo cancellers remove signal reflections and transmission signal elements from signals received by their respective transceivers.
11 . The system of claim 1 , wherein each transceiver includes a hybrid, each hybrid removing a majority of transmission signal elements from a received signal that is fed to a receiver portion of the respective transceiver.
12 . A method of data communication comprising:
sending a multilevel PAM signal from a first transceiver to a second transceiver; and
sending a multilevel PAM signal from the second transceiver to the first transceiver,
where signal transmission on at least one lane is full duplex.
13 . The system of claim 12 , wherein the first and second transceivers each use an echo canceller to remove elements of a transmitted signal from a received signal.
14 . A data transmission system comprising:
a first transceiver;
a second transceiver; and
four data lanes connecting the first and second transceivers,
where each transceiver has an echo canceller, each echo canceller removing signal reflections and transmission signal elements from received signals by their respective transceivers,
where the lanes travels through a backplane,
where data transmission on the lanes is full duplex,
where data transmission speed is at least 10 gigabits per second,
where a data signal comprises a pulse amplitude modulated signal with at least four levels,
where each lane has a symbol rate of at least 1.5625 gigabits per second,
where each transceiver includes a hybrid, each hybrid removing a majority of transmission signal elements from a received signal that is fed to a receiver portion of the respective transceiver.