DC9 CREW AT PVD MISIDENT RWY AS TXWY DURING TAXI OUT FOR DEP.

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CLRED TO TAXI FROM PARKING RAMP VIA TXWYS; T; D; S TO RWY 5R AT PVD. CAPT TAXIING THE ACFT MISIDENTED RWY 5L FOR TXWY T; XING THE THRESHOLD AT INTXN OF TXWYS T AND C BEFORE REALIZING THE ACFT WAS ENTERING THE INACTIVE RWY. CTLR CLRED THE CREW TO PROCEED; STATING THAT THE RWY WAS INACTIVE. HOWEVER; THE ACFT HAD ENCROACHED THE RWY THRESHOLD BEFORE BEING NOTIFIED BY THE CTLR. WX WAS CLR AT THE TIME; THE ERROR INVOLVED MISIDENTING THE RWY AS A TXWY IN ADJACENT TO THE PARKING RAMP. CLOSER ATTN TO THE AIRFIELD DIAGRAM; PERHAPS FLASHERS OR MORE DISTINCT MARKINGS; MAY HAVE PRECLUDED THE EVENT. SUPPLEMENTAL INFO FROM ACN 532434: I (FO) WAS COMPLETING MY DUTIES (HEADS DOWN) WHILE CAPT MADE INITIAL TURN AND IDENTED OUR LOCATION AS I CHKED THE DIAGRAM AND LOOKED UP. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: FO RPTR STATED THEIR FLT WAS PUSHED STRAIGHT BACK AND WHEN RELEASED BY THE GND CREW; THE CAPT TURNED TO THE R AND BEGAN TO TAXI. SEEING THE WIDE AREA; WHICH WAS THE ENTRANCE TO TXWY C; THE CAPT TAXIED TOWARDS IT AND MAY HAVE BELIEVED IT WAS THE RWY 5L THRESHOLD. THE FO SAID AT THE TIME OF THE INCIDENT; HE WAS HEADS DOWN CHKING NUMBERS AND STARTING THE PRETKOF LIST.