512     6   

      .   -
      5,5 .

   PRI    -
    1  1,    4-  
  1800 .

   NT2 (Network Termination 2) 
     ,   
     . -
,     :   (), 
  BRI, ,    
 (,   D),   TDM,  -
        .  -
   NT2   NT1   
 .         
 NT1.                                   "

   1 (Terminal Equipment 1)  
,     BRI  PRI.
  S     
,      ISDN. 
      -.   -
  NT2  ,    S    
  S/T.

   2 (Terminal Equipment 2) 
 ,     BRI  PRI.  -
  ^,    -
,    ISDN,  RS-232C, .21  V.35.  
    ISDN    
(Terminal Adaptor, ).      
      .

    S/T   4- .
I/      1     _
JNT2-o6bi4Ho   ,    ISDN 
  ,       4--
   ,   2-.   BRI  -
     AMI,   
  ,      -
  .   PRI  
,  ,     1  1,    B8ZS 
HDB3.

   PRI   100  1000   
    (. 6.18).

  ,      (1  2+)
     ,    8 
    NT1 ( NT2   ) 
    (   -
    Ethernet,    4- ). 
    (   R, -