523       _________________________________

  ,      PNNI, -
    .

! VCI=2

/~-~-~.''-^.,..-..... VCI=4 /(	3"VCI=9'1	K2VCI=10 ,-	
		~"~~'~'^\{1 1	3 81130
^ ]VCI=8		15	

,   2^    ,          __L^
1581120  DA= 1583250
VCI=3

^		-----KI-----	fe=
/&^s"^s^'^	1	VCI=4 ;'""(	3 V
		L. 	

DA=1581130\ VCI=4 /


 1

	
1583250	2
1581130	3
'.	:

VCI-in	VCI-out	
3 .	2	--
4	10	U

  . 	l	VCI-in	VCI-out	
VCI-in	VCI-out			10	4	1
2	3	1		9	8	4

. 6.21.      

        
   Call Request   1   3.  
  ,     -
          
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       (  
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 10.         -
 3  ,     10    -
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      VCI,       .

           
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.