440     5        

   ,      -
    ,    -
 .      
,        
   ,     -
   .     -
  ,   1/1,   , ,
  SDH   155 /  622 /.   -
        
       12-14.    
     , -
     ,  
,    (hot swap) ,    -
.     
 Backbone Concentrator Node (BCN)  Nortel Networks
( Bay Networks), Cisco 7500, Cisco 12000.

     
     .   ,    
 ,      .  -
       -
 .      ,   
  : 4-5.      -
 .       
.      
 BLN, ASN  Nortel Networks, Cisco 3600, Cisco 2500,
NetBuilder II  3Com.      -
,      
 ,       -
  .

   ,  , 
         
   .     -
       .  , -
     Ethernet 10 /,     
    64 /, 1,544  2 /. 
       
       .  
     .  -
    ,    
 ,       -
 . ,  ,    
ISDN,         . . -
      Nautika -
 Nortel Networks, Cisco 1600, Office Connect  3Com, 
Pipeline  Ascend.

   ( 3- ) 
      .  , -
  ,    ,     