AN MD80 CREW; TAXIING FOR TKOF AT LAX; FAILED TO CONTACT N GND CTL AT THE DESIGNATED CHK POINT AND FAILED TO HOLD SHORT OF A DESIGNATED TXWY.

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AFTER PUSHBACK FROM THE GATE WE CONTACTED LA GND CTL ON FREQ 121.75. THE FREQ HAD A LOT OF TFC ON IT AND IT WAS DIFFICULT TO OBTAIN A TAXI CLRNC. WHEN WE FINALLY GOT IN TOUCH WITH GND CTL; WE WERE TOLD TO EXPECT RWY 24L. WE WERE POSITIONED FACING S. TXWY C8 WAS IN FRONT OF US. THE GND CTLR INSTRUCTED US TO TURN R ON TXWY B FOLLOWED BY ANOTHER R ON TXWY P; FOLLOWED BY AN UNCLR XMISSION. WE PROCEEDED TO TURN R ON TXWY B. WHILE ON TXWY B I ASKED THE FO TO CONFIRM THE TAXI INSTRUCTIONS AFTER OUR R TURN ONTO TXWY P. THE FO CONTACTED GND TO REQUEST THE INSTRUCTIONS AGAIN AFTER TXWY P. THE CTLR GAVE US A NEW INSTRUCTION TO HOLD SHORT OF TXWY P TO GIVE WAY TO A G4 AT TXWYS P AND B. ONCE THE G4 PASSED US; TO FOLLOW HIM N ON TXWY Q TO RWY 24L. WHILE FOLLOWING THE G4 N ON TXWY Q AND XING TXWY D GND TOLD US TO CONTACT N GND CTL ON FREQ 121.65. UPON CHKING IN WITH N GND; THE CTLR INFORMED US THAT WE SHOULD HAVE HELD SHORT OF TXWY D WHILE WE WERE ON TXWY Q; BUT TO CONTINUE WITH A R TURN ON TWY E AND FOLLOW A B747 TO RWY 24L. WE APOLOGIZED TO THE CTLR FOR NOT HOLDING SHORT; AND HE ACCEPTED OUR APOLOGY. THE FO AND I WERE CONFUSED AND DISCUSSED THE ORIGINAL CLRNC GIVEN BY THE S CTLR. WE BOTH AGREED NO HOLD SHORT INSTRUCTION WAS ASSIGNED AND NONE WAS READ BACK. WE DECIDED TO ASK THE N GND CTLR HOW WE WERE TO KNOW TO HOLD SHORT OF TXWY D. HE SAID IT IS WRITTEN IN UNDER THE N RTE. AGAIN WE APOLOGIZED AND THE CTLR SAID IT WAS NOT A PROB. WE ALSO EXPLAINED WE WERE NEW TO THE LAX ARPT ENVIRONMENT. THE FO AND I CONTINUED TO DISCUSS THE INSTRUCTIONS BY THE S CTLR AND DETERMINED THAT A RTE; OR 'N RTE' WAS NOT MENTIONED OR ASSIGNED. HAD A TAXI RTE BEEN USED BY THE CTLR AS A TERM; WE WOULD HAVE AT LEAST REQUESTED MORE INFO. BY ASKING THE CTLR OR SEARCHING THROUGH OUR COMMERCIAL CHARTS. I FEEL A BREAK DOWN IN COM WAS RESPONSIBLE FOR THIS SIT. I ALSO BELIEVE THE CTLR ASSUMED WE WERE FAMILIAR WITH THE PROCS; DUE TO THE FACT OUR AIRLINE HAS SERVED LAX FOR QUITE A WHILE NOW. HOWEVER; THIS WAS MY SECOND TIME GOING TO THE N COMPLEX IN A YR AND IT WAS THE FO'S FIRST TIME. AS A CREW LAX WAS NEW TO US. I ALSO FEEL THAT THE CONGESTION ON THE GND FREQS PLAYED A ROLE IN THE SIT AS WELL.