-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=- LINE SIGNALS IN CCITT SYSTEMS -=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=- You will be given an entry followed by 4 pieces of information on that en- try. The titles for those 4 pieces of information are: Direction, CCITT #3 (1VF), CCITT #4 (2VF), and CCITT #5 (2 VF). The individual pieces of infor- mation will be, for the most part, ab- breviated to the use of symbols, the symbols table will follow the entries at the end of this section. SEIZE TERMINAL: -->,X,PX,X SEIZE TRANSIT: -->,N/A,PY,N/A START PULSING-TERMINAL: <--,X,X,Y START PULSING-TRANSIT: <--,N/A,Y,N/A END OF PULSING (ST)*: -->,250MS,xSxSxS x,1500+1700HZ BUSY: <--,XX,PX,Y ACKNOWLEDGE: -->,N/A,N/A,X ANSWER: <--,XSX,PY,X CLEAR BACK (ON HOOK): <--,XX,PX,Y RING FORWARD: -->,XSX,PYY,Y(850+OR-200 MS) CLEAR FORWARD (DISCONNECT): -->,XXSXX, PXX,X+Y DISCONNECT ACKNOWLEDGE: <--,XXSXX,PYY, X+ SYMBOL TABLE X = 2280+OR-6HZ,120+OR-30MS XX = 2280+OR-6HZ,600+OR-120MS S=100+OR-20MS SILENCE <-- OR --> = DIRECTION Those were for CCITT #3 (1VF) (Second item after each signal) X = 2040+OR-6HZ,100+OR-20MS Y = 2400+OR-6HZ,100+OR-20MS XX = 350+OR-70MS YY = 350+OR-70MS S = 35+OR-7MS;x:2040HZ,35MS P = (2040HZ,2400HZ),150+30MS Those were for CCITT #4 (2VF) X = 2400+OR-6HZ Y = 2600+OR-6HZ Those were for CCITT #5 (2VF) N/A = Not Applicable * = Combination #15 of Address Code Downloaded from Strictly Business (415) 583-1673. Press a key... a