
 -=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-
     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





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