text: Now, there are seven devices and 1900 kilometers (1180.6 miles) of distance delay. All the 
  devices are adding 200 microseconds of delay each way. The distance adds 9.5 milliseconds 
  each way, for a total of 19 milliseconds. Combined with the device latency, the delay is 
  19.4 milliseconds of physical latency minimum, which is under the 80-millisecond limit of 
  Global Mirror until you realize that this number is the best case number. 
  
  **599** Chapter 11. Advanced Copy Services 