Компьютерные технологии в науке и образовании. Смирнов С.А. - 131 стр.

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Packet Switching 
  ,      
, .  – 
.
Parity Bit 
, , 
 ().
PCM (Pulse Code Modulation)
    (, )   
 64 Kbps.
Physical Layer ()
  OSI,     
    .  ,  
.
Physical Media ()
       .
 OSI  (Layer
0).  (, ) 
, . . 
 OSI.
Ping: Packet internet groper.
, 
  (ICMP echo request –   ICMP)  
. : "Ping host X to see if it is up!"
Port ()
,    Internet  
     .
.  selector. , . 
.
PPP: Point-to-Point Protocol.
  SLIP, PPP   -
, .
Presentation Layer ()
  OSI,    
  ()    
.
Protocol ()
     ,   
.
Proxy
,         
 . Proxy-    , 
        
, .
PSTN (Public Switched Telephone Network  
)
 ,      
, .
PVC Permanent Virtual Circuit )
.
QoS (Quality of Service)
. QoS 
, .
Packet Switching
                                                               ,
                                       ,                                     .                                                                                     –
                           .
Parity Bit
                                                    ,                                                                    ,
                                                                                 (                                                                    ).
PCM (Pulse Code Modulation)
                                                                                                         (                   ,                )
                                                                                 64 Kbps.
Physical Layer (                                                        )
                                                   OSI,
                                                                                                     .                                    ,
                                                                                                                                                               .
Physical Media (                                                   )
                                                                                                                                                                                .
                                                                       OSI                                                                                                 (Layer
         0).                                                       (                         ,                   )
                                                                                                                                          , . .
               OSI.
Ping: Packet internet groper.
                  ,
                                                        (ICMP echo request –                       ICMP)
                       .                                              : "Ping host X to see if it is up!"
Port (             )
                                           ,                                                                                             Internet
                                                                                                                                                                                       .
               .                       selector.                                                                                 ,                                             .
                                                                                     .
PPP: Point-to-Point Protocol.
                                                          SLIP, PPP                                                                                                                    -
                                                                                                             ,                                                                     .
Presentation Layer (                                                                     )
                                                    OSI,
                                                                   (                             )
                               .
Protocol (                                     )
                                                                                                                                     ,
                                                                                                                                                  .
Proxy
                                   ,
                                                   . Proxy-                                                                                                            ,

                       ,           .
PSTN (Public Switched Telephone Network
            )
                              ,
                          ,                                                                                                                                .
PVC Permanent Virtual Circuit                                                                                                                     )
                                                                                                                                                                           .
QoS (Quality of Service)
                                                                                                                                         . QoS
                                                           ,                                                         .

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