text: In Figure 11-155 on page 600, the amount of time in microseconds that is required to transmit 
  a packet across network links of varying bandwidth capacity is compared. The following 
  packet sizes are used: 
  
  (cid:2) 64 bytes: The size of the common ping packet 
  (cid:2) 1500 bytes: The size of the standard TCP/IP packet 
  (cid:2) 2148 bytes: The size of an FC frame 
  
  Finally, your path maximum transmission unit (MTU) affects the delay that is incurred to get a 
  packet from one location to another location. An MTU might cause fragmentation or be too 
  large and cause too many retransmits when a packet is lost. 
  
  **Note:**Unlike 1720 errors, 1920 errors are deliberately generated by the system because it 
  evaluated that a relationship could impact the host’s response time. The system has no 
  indication on if/when the relationship can be restarted. Therefore, the relationship cannot 
  be restarted automatically and it needs to be done manually. 