AT FL310; MACH PT 80 THE DA50 ENCOUNTERED SUDDEN LIGHT TURB; THEN MODERATE; AND THEN AN UNCOMMANDED 40 DEG ROLL R THEN L. TCASII SHOWED A TARGET 12 O'CLOCK APPROX 6 MI AHEAD. WHEN ASKED; THE CTR STATED THE ACFT WAS A B757. NO DAMAGE OR INJURIES OCCURRED.

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CRUISE AT FL310; MACH .80; SUDDENLY LIGHT TURB; THEN MODERATE; AND ROLL R AFTER L MAX BANK 40 DEGS. TCASII SHOWED TARGET 12 O'CLOCK APPROX 6 MI AHEAD. ONCE CLR OF THE TURB WE ASKED CTR WHAT TYPE ACFT WAS AT OUR 12 O'CLOCK AND RPTED THE WAKE TURB. B757 RPTED BY THE CTLR. NO DAMAGE; NO INJURIES; JUST ANOTHER EXAMPLE OF THE FAR REACHING EFFECTS OF THE B757. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED HE WAS FLYING A DA50. HE STATED HE BELIEVED A SIGNIFICANT CAUSE OF THE WAKE ENCOUNTER WAS THE B757 WAS CLBING THROUGH HIS ALT. IF THE B757 WERE LEVEL AT HIS ALT OR ANOTHER ALT THE ENCOUNTER WOULD NOT HAVE BEEN EXPERIENCED. THE RPTR DID NOT FEEL THERE WAS ANYTHING THAT COULD HAVE BEEN DONE DIFFERENTLY. THE CTLR HAD HIS SEPARATION AND THE PLT COULD NOT BE EXPECTED TO DEVIATE FROM THE AIRWAY. THE PLT HAD REQUESTED HIGHER BUT WAS UNABLE DUE TO TFC. HE APPLAUDED THE CTLR FOR HANDLING ALL THE TFC HE WAS HANDLING AND FELT UNDER THE CIRCUMSTANCES THE CTLR COULD NOT HAVE BEEN EXPECTED TO ADVISE OF TFC CLBING THROUGH HIS ALT AHEAD; BUT IT WOULD HAVE BEEN NICE TO KNOW. HE SAID HE WOULD NOT HAVE TURNED OFF THE AIRWAY ON THE BASIS OF THE ADVISORY.