Plant Test Codes in Texas
by El Oscuro, 1998

NPA     NXX     Purpose
---     ---     -------
972	955	LOAD BOX TRK TEST MILLIWATT                     	
972	958	BELLCORE AUTHORIZED PLANT TEST CODE             	
972	959	BELLCORE AUTHORIZED PLANT TEST CODE             	
972	970	PLANT TEST 10-DIG ANAC                          	
972	971	STATION RINGER TEST                             	
972	973	STATION RINGER TEST	
972	974	STATION RINGER TEST	

713	231	STATION RINGER                                  	
713	234	STATION RINGER - ANAC FOR ANI CKT               	
713	258	STATION RINGER  (281 NPA RELIEF CODE #1)     	
713	281	CAROT TEST (ADJACENT NPA)	
713	322	DALCOM TRUNK                                    	
713	325	BAT GD. REM                                     	
713	352	TENNECO TESTING                                 	
713	380	AUTO NUMB ANN                                   	
713	381	PLANT TEST CODE (GTE SOUTHWEST)	
713	489	TEMP TEST FOR LNP	
713	573	TEMP TEST FOR LNP	
713	574	TEMP TEST FOR LNP	
713	958	BELLCORE AUTHORIZED PLANT TEST CODE             	
713	959	BELLCORE AUTHORIZED PLANT TEST CODE             	
713	979	PLANT TEST (409 NPA RELIEF CODE #1) 	

281	223	DAVAR TRUNK TEST     	
281	254	PLANT TEST FOR BATTERY & GROUND REMOVAL	
281	825	TEMPORARY TEST FOR LNP	
281	826	TEMPORARY TEST FOR LNP	
281	827	TEMPORARY TEST FOR LNP	
281	887	ANAC	
281	958	BELLCORE AUTHORIZED PLANT TEST CODE             	
281     959     BELLCORE AUTHORIZED PLANT TEST CODE