1. A device for the simultaneous double-side grinding of workpieces in wafer form, comprising two substantially circular grinding wheels arranged collinearly, the grinding surfaces of which are positioned opposite one another in the axial direction based on the axes of rotation of the grinding wheels, and define a midplane located between the grinding wheels, and two devices, likewise positioned opposite each other, for hydrostatically bearing the workpiece in wafer form, each of which comprise at least one hydrostatic bearing and in each case at least one dynamic pressure tube for measuring the spacing between the workpiece and the device for hydrostatic bearing, wherein that surface of each of the two devices for hydrostatic bearing which faces the workpiece is nonplanar, such that the spacing between the surface and the midplane between the grinding wheels has a minimum value proximate that edge of the device for hydrostatic bearing which faces the grinding wheels, and the spacing increases with increasing distance from the grinding wheels.
2. The device of claim 1, wherein that surface of each of the two devices for hydrostatic bearing which faces the workpiece is conical.
3. The device of claim 1, wherein that surface of each of the two devices for hydrostatic bearing which faces the workpiece is convex.
4. The device of claim 1, wherein that surface of each of the two devices for hydrostatic bearing which faces the workpiece is stepped.
5. The device of claim 1, further comprising at least one bore, through which liquid and any material abraded by grinding can be discharged from the vicinity of the dynamic pressure tube, positioned in the vicinity of each dynamic pressure tube.
6. The device of claim 5, wherein the bore, at the surface of the device for hydrostatic bearing of the workpiece in wafer form, terminated within a groove which surrounds the dynamic pressure tube in the form of a ring.
7. The device of claim 1, wherein that surface of each of the two devices for hydrostatic bearing which faces the workpiece, at its edge adjacent to the grinding wheel, does not have any grooves originating from the edge.
8. A device for the simultaneous double-side grinding of a workpiece in wafer form, comprising two substantially circular grinding wheels with collinearly arranged axes of rotation wherein the grinding surfaces of the grinding wheels are positioned opposite one another in axial direction, based on the axes of rotation, and two devices, likewise positioned opposite each other, for hydrostatically bearing the workpiece in wafer form, which each comprise at least one hydrostatic bearing and in each case at least one dynamic pressure tube for measuring the spacing between the workpiece and the device for hydrostatic bearing, wherein at least one bore, through which liquid and any material abraded by grinding can be discharged from the vicinity of the dynamic pressure tube, is arranged in the vicinity of each dynamic pressure tube.
9. The device as claimed in claim 8, wherein the bore, at the surface of the device for hydrostatic bearing of the workpiece in wafer form, ends in a groove which surrounds the dynamic pressure tube in the form of a ring.
10. A device for the simultaneous double-side grinding of a workpiece in wafer form, comprising two substantially circular grinding wheels with collinearly arranged axes of rotation, wherein the grinding surfaces of the grinding wheels are positioned opposite one another in axial direction, based on the axes of rotation, and two devices, likewise positioned opposite each other, for hydrostatically bearing the workpiece in wafer form, which each comprise at least one hydrostatic bearing and in each case at least one dynamic pressure tube for measuring the spacing between the workpiece and the device for hydrostatic bearing, wherein that surface of each of the two devices for hydrostatic bearing which faces the workpiece, has at least one groove which begins at the edge not facing the grinding wheels, runs in the direction of the edge facing the grinding wheels, before it reaches that edge.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A resetting method in a Passive Optical Network (PON), the method comprising:
receiving, by a burst receiver, a preamble sequence and synchronizing data;
after synchronizing, continuing to receive data, and matching a Burst Terminator (BT); and
resetting the burst receiver after successfully matching the BT.
2. The method according to claim 1, wherein after synchronizing the method further comprises:
matching a burst delimiter for the received data, and determining a start position of a burst;
wherein the continuing to receive data comprises:
continuing to receive burst data after successfully matching the burst delimiter.
3. The method according to claim 1, wherein matching the BT comprises one of:
matching the BT according to a bit shift or matching the BT based on a shift of a length, wherein when a Hamming distance between the received data and the terminator is smaller than a preset threshold, the matching is successful.
4. The method according to claim 1, wherein the BT is a sequence with all zeros.
5. The method according to claim 2, wherein the BT is a binary sequence with alternating zeros and ones.
6. The method according to claim 4, wherein the BT uses one byte as a unit, and a length of the BT is an integral multiple of one byte.
7. The method according to claim 4, wherein when the BT is the sequence with all zeros, the BT is a protection time slot between bursts.
8. A burst receiver in a Passive Optical Network (PON), comprising:
a receiving module, configured to receive burst data, wherein the burst data comprises a preamble sequence, a data payload, and a Burst Terminator (BT);
a synchronization module, configured to synchronize data according to the received preamble sequence;
a BT matching module, configured to match a BT; and
a reset module, configured to reset the burst receiver after the BT is successfully matched.
9. The burst receiver according to claim 8, further comprising:
a burst delimiter matching module, configured to match a burst delimiter for the received burst data and determine a start position of the burst data.
10. The burst receiver according to claim 8, wherein the BT matching module performs matching according to one of a bit shift or based on a shift of a length, and when a Hamming distance between the received data and the terminator is smaller than a preset threshold, the matching is successful.
11. An upstream burst transmission method in a Passive Optical Network (PON), the method comprising:
sending a Physical Layer Overhead upstream (PLOu), wherein the PLOu comprises a preamble, a delimiter, and a burst header;
sending an assigned time slot, wherein the assigned time slot comprises a transmission convergence layer frame overhead and a transmission convergence layer frame payload; and
sending a Burst Terminator (BT), wherein the BT is configured to delimit a burst to enable the burst receiver which receives the burst to reset after a matching of the BT is successful,
wherein the matching of the BT comprises one of: matching the BT according to a bit shift or matching the BT based on a shift of a length.
12. The method according to claim 11, wherein a length and a format of the BT are set according to requirements of a system on reliability of BT matching detection.
13. The method according to claim 11, wherein the BT is a binary sequence with one of alternating zeros and ones, or a sequence with all zeros.
14. The method according to claim 13, wherein when the BT is the sequence with all zeros, the BT is a protection time slot between bursts.
15. The method according to claim 13, wherein when a Hamming distance between the received data and the terminator is smaller than a preset threshold, the matching is successful.