| 
  
   
    |  |  |  
    |  | Gigabit Ethernet Networking Technology |  | 
 
  | 
  
   
    |  |  |  |  
    |  | High speed LAN Backbone |  
    |  | Using Gigabit switches |  
    |  | Tie 100BaseT LANs together |  
    |  | High Speed Point-to-point |  
    |  | Fiber connection |  
    |  | Bridge sites together |  | 
 
  | 
  
   
    |  |  |  |  
    |  | Physical Layer |  
    |  | 1000BaseLX: 1300 nm laser (long infrared) 5 Km SMF
 |  
    |  | 1000BaseSX: 850 nm laser (barely infrared) 500 m MMF
 |  
    |  | 1000BaseCX: 150W balanced twinax 25 m
 |  
    |  | 1000BaseT: 4 pair Cat5 UTP 100m
 |  | 
 
  |  | 
 
  | 
  
   
    |  |  |  |  
    |  | Full-duplex connections |  
    |  | Point-to-point |  
    |  | No collisions |  
    |  | Half-duplex |  
    |  | Collision segments |  
    |  | Requires longer frames |  | 
 
  | 
  
   
    |  |  |  |  
    |  | Serializer |  
    |  | 8B/10B
    Encoding |  | 
 
  |  | 
 
  |  | 
 
  |  | 
 
  |  |