2.1.        127

.        -
     ,   UTP  5. -
        7,
         -
      - ,  -
      .

     

   STP      -
 ,       ,  -
,   ,       .
        , 
    .   -
    ,      .

 ,     ,
   IBM.        -
,   : Type I, Type 2,..., Type 9.

      Type 1 
IBM.    2-   ,  
,  .    Type 1 
   UTP  5.   
 Type 1  150  (UTP  5    100 ),
        -
  UTP  STP Type 1 . ,  
  ,    100 ,   -
    150 .    STP Type 1
  .     
 Token Ring,         -
  .       STP
Type I  , lOOVG-AnyLAN,   Fast Ethernet (  
  Fast Ethernet  UTP  5).    
  UTP  STP,  ,     -
  .   STP Type 1   
EIA/TIA-568A, ISO 11801  EN50173,     .

       IBM Type 2, -
   Type 1   2   -
   .

      
  IBM.

     IBM     
     
(Type 3)    (Type 5).

 

     ,   -
    ,   .  -
      .