Automotive asymmetric ethernet using frequency-division duplex
An Ethernet Physical Layer (PHY) device includes a link interface and a transceiver. The link interface is configured to connect to a full-duplex wired Ethernet link. The transceiver is configured to receive first Ethernet signals carrying first data at a first data rate over the Ethernet link in a first direction, the first Ethernet signals occupying a first frequency band, and to transmit second Ethernet signals carrying second data at a second data rate different from the first data rate, over the Ethernet link in a second direction that is opposite the first direction, the second Ethernet signals occupying a second frequency band that is different from the first frequency band.
1. An Ethernet Physical Layer (PHY) device, comprising:
a link interface, configured to connect to a full-duplex wired Ethernet link;
a transceiver, configured to:
receive first Ethernet signals carrying first data at a first data rate over the Ethernet link in a first direction, the first Ethernet signals occupying a first frequency band; and
transmit second Ethernet signals carrying second data at a second data rate different from the first data rate, over the Ethernet link in a second direction that is opposite the first direction, the second Ethernet signals occupying a second frequency band that is different from the first frequency band;
a first filter tuned to the first frequency band and configured to suppress a portion of the first Ethernet signals that is above the first data rate, by filtering the first Ethernet signals received from the Ethernet link; and
a second filter tuned to the second frequency band and configured to suppress a portion of the second Ethernet signals that is below the second data rate, by filtering the second Ethernet signals transmitted to the Ethernet link.
2. The Ethernet PHY device according to claim 1 , wherein the transceiver is configured to receive the first Ethernet signals without canceling an echo of the transmitted second Ethernet signals.
3. The Ethernet PHY device according to claim 1 , wherein the second frequency band partly overlaps the first frequency band.
4. The Ethernet PHY device according to claim 1 , wherein the transceiver is locally coupled to a sensor in a vehicle, the sensor providing the second data having the second data rate to the transceiver for transmission in the second frequency band, the transceiver being configured to receive the first data, having the first data rate and received in the first frequency band, from a processor or switch in the vehicle over the Ethernet link.
5. The Ethernet PHY device according to claim 1 , wherein the transceiver is locally coupled to a processor or switch in a vehicle, the processor or switch providing the second data having the second data rate to the transceiver for transmission in the second frequency band, the transceiver being configured to receive the first data, having the first data rate and received in the first frequency band, from a sensor in the vehicle over the Ethernet link.
6. A method for communication, comprising:
in an Ethernet Physical Layer (PHY) device connected to a full-duplex wired Ethernet link,
receiving first Ethernet signals carrying first data at a first data rate over the Ethernet link in a first direction, the first Ethernet signals occupying a first frequency band;
transmitting second Ethernet signals carrying second data at a second data rate different from the first data rate, over the Ethernet link in a second direction that is opposite the first direction, the second Ethernet signals occupying a second frequency band that is different from the first frequency band;
suppressing a portion of the first Ethernet signals that is above the first data rate, by filtering the first Ethernet signals using a first filter tuned to the first frequency band; and
suppressing a portion of the second Ethernet signals that is below the second data rate, by filtering the second Ethernet signals using a second filter tuned to the second frequency band.
7. The method according to claim 6 , wherein receiving the first Ethernet signals is performed without canceling an echo of the transmitted second Ethernet signals.
8. The method according to claim 6 , wherein the second frequency band partly overlaps the first frequency band.
9. The method according to claim 6 , wherein receiving the first Ethernet signals comprises receiving the first Ethernet signals, having the first data rate and received in the first frequency band, from a processor or switch in a vehicle over the Ethernet link, and wherein transmitting the second Ethernet signals comprises obtaining the second data, having the second data rate, from a sensor in the vehicle, and transmitting the second Ethernet signals carrying the obtained second data, having the second data rate, in the second frequency band.
10. The method according to claim 6 , wherein receiving the first Ethernet signals comprises receiving the first Ethernet signals, having the first data rate and received in the first frequency band, from a sensor in a vehicle over the Ethernet link, and wherein transmitting the second Ethernet signals comprises obtaining the second data, having the second data rate, from a processor or switch in the vehicle, and transmitting the second Ethernet signals carrying the obtained second data in the second frequency band.