Method and system for 10GBASE-T start-up
Certain aspects for the start-up procedure of transceivers supporting higher data rates over twisted-pair copper cabling are provided for 10 Gbit/sec Ethernet links (10GBASE-T). During a PMA (physical medium attachment) training period of the start-up procedure, long PMA training frames are exchanged periodically between link partners. A significant portion of each PMA training frame consists of known pseudo random sequences simultaneously transmitted over four wire pairs. PMA training frames include an InfoField for exchanging parameters and control information between link partners. For example, the InfoField's payload comprises fields for indicating current transmit power backoff (PBO), next PBO, requested PBO, transition count, control information, and for communicating precoder coefficients. Information in InfoFields is repeated and is not necessary that a link partner decodes every InfoField. For example, by occasionally reading the transition count, a link partner can determine when a change in transmit PBO and/or a state transition is to occur.
1. A method for setting up communication devices, the method comprising:
transmitting, from a device, physical medium attachment (PMA) training frames to a remote device during a training period, wherein:
a majority portion of each of the transmitted PMA training frames is comprised of pseudo random known sequences that are utilized to establish transceiver operations for communication between the device and the remote device; and
the device and the remote device are communicatively coupled via a wired Ethernet link.
2. The method of claim 1 , wherein a remaining portion of each of the transmitted PMA training frames comprises exchanging parameters and control information.
3. The method of claim 2 , wherein the remaining portion of the transmitted PMA training frames comprises fields for communicating a plurality of coefficients and associated index fields indicating which coefficients are currently being transmitted and which coefficients have already been received.
4. The method of claim 2 , wherein the remaining portion of the transmitted PMA training frames comprises one or more of a current power backoff (PBO) field, a next PBO field, a requested PBO field, a transition count field, and at least one control field.
5. The method of claim 1 , comprising receiving, by the device, PMA training frames from the remote device during the training period, wherein a majority portion of each of the received PMA training frames is comprised of pseudo random known sequences that are utilized to establish transceiver operations for communication between the device and the remote device.
6. The method of claim 5 , wherein a remaining portion of the received PMA training frames comprises one or more of a current PBO field, a next PBO field, a requested PBO field, a transition count field, and at least one control field.
7. The method of claim 6 , comprising determining a power level change based on one or more of the current PBO field, the next PBO field, and the requested PBO field.
8. The method of claim 6 , wherein the transition count field indicates a number of received PMA training frames after which a power level change occurs in a signal of the remote device or a number of received PMA training frames after which a state transition occurs in the remote device.
9. The method of claim 6 , wherein the received PMA training frames are communicated to the device by the remote device after the remote device recovers a master clock during the training period.
10. The method of claim 1 , comprising programming coefficients in a precoder in the device during the training period.
11. A system for setting up communication devices, the system comprising:
a device that is operable to transmit physical medium attachment (PMA) training frames to a remote device during a training period, wherein a majority portion of each of the transmitted PMA training frames is comprised of pseudo random known sequences that are utilized to establish transceiver operations for communication between the device and the remote device; and
the device is operable to be communicatively coupled to the remote device via a wired Ethernet link.
12. The system of claim 11 , wherein a remaining portion of each of the transmitted PMA training frames comprises exchanging parameters and control information.
13. The system of claim 12 , wherein the remaining portion of the transmitted PMA training frames comprises fields for communicating a plurality of coefficients and associated index fields indicating which coefficients are currently being transmitted and which coefficients have already been received.
14. The system of claim 12 , wherein the remaining portion of the transmitted PMA training frames comprises one or more of a current power backoff (PBO) field, a next PBO field, a requested PBO field, a transition count field, and at least one control field.
15. The system of claim 11 , wherein:
the device is operable to receive PMA training frames from the remote device during the training period; and
a majority portion of each of the received PMA training frames is comprised of pseudo random known sequences that are utilized to establish transceiver operations for communication between the device and the remote device.
16. The system of claim 15 , wherein a remaining portion of the received PMA training frames comprises one or more of a current PBO field, a next PBO field, a requested PBO field, a transition count field, and at least one control field.
17. The system of claim 16 , wherein the device is operable to determine a power level change based on one or more of the current PBO field, the next PBO field, and the requested PBO field.
18. The system of claim 16 , wherein the transition count field indicates a number of received PMA training frames after which a power level change occurs in a signal of the remote device or a number of received PMA training frames after which a state transition occurs in the remote device.
19. The system of claim 16 , wherein the received PMA training frames are communicated to the device by the remote device after the remote device recovers a master clock during the training period.
20. The system of claim 11 , wherein the device comprises a precoder and is operable to program coefficients in the precorder during the training period.