ACR HAS CLOSE PROX WITH MLG ON ARR INTO BWI. TCASII RA.

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WAS ON A FLT FROM FLL TO BWI DSNDING ON NOTTINGHAM 2 ARR INTO BWI. PASSING THROUGH 20000 FT; ZDC ADVISED US THAT WE WERE TO CROSS SABBI INTXN AT 15000 FT WITH NO SPD RESTRICTION. 45 SECONDS LATER CENTER SAID TO CROSS SABBI AT 15000 FT AND 250 KTS. 15 SECONDS THEY ADVISED US TO CONTACT WASHINGTON APCH ON 128.85. AFTER TRYING TO RAISE APCH 2 TIMES ON 128.85; WITHOUT SUCCESS; RETURNED TO CENTER FREQ. THEY INFORMED US THAT THE FREQ SHOULD HAVE BEEN 128.35. UPON SWITCHING TO THE NEW FREQ; WASHINGTON APCH IMMEDIATELY SAID TO STOP OUR DSCNT AT 16000 FT AND TURN L 90 DEGS. AT THIS TIME WE WERE 15950 FT; DSNDING AT 1000 FPM. HAVING STOPPED THE DSCNT AT 15900 FT; THE TCASII ADVISED WE HAD TFC OFF THE R SIDE APPROX 3 MI AND CLOSING; 300 BELOW US AND WAS ALSO DSNDING. THE TCASII ADVISED A 900 FT CLB; WE CLBED TO 16500 FT BEFORE THE ADVISORY STOPPED. WE NEVER SAW THE OTHER TFC; BUT WHEN I GOT ON THE GND AT BWI I TALKED TO THE OTHER CAPT OF THE CONFLICTING AIRPLANE. HE SAID THAT APCH ADVISED HIM TO TURN R AND INCREASE HIS RATE OF DSCNT TO 15000 FT. HE ALSO ADVISED ME THAT HE SAW ME VISUALLY TURNING TO HIS L AND CLBING. THE CTLR ON WASHINGTON APCH WAS TALKING TO 8- 9 ACFT WHEN WE CAME ON HIS FREQ. AS FAR AS I CAN FIGURE OUT; BOTH ACFT WERE CLRED TO SABBI AT 15000 FT. INDICATION WAS THAT WE WERE OVERTAKING THE OTHER ACFT AND THE SPACING BECAME TOO CLOSE. WE WERE NEVER ADVISED ABOUT THE OTHER ACFT UNTIL WE GOT THE TCASII ALERT. BECAUSE OF THE WRONG FREQ AND THE TIME IT TOOK TO CORRECT IT; PLUS THE APCH CTLR HAVING TO WORK THAT GREAT NUMBER OF AIRPLANES; ALL CONTRIBUTED TO THE CLOSENESS OF BOTH ACFT.