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Connect the red and black leads to the pair and press 
the [Enter] key. The 965DSP displays the word 
“Connecting” while the instrument goes through 
three steps: 
  1) AIP (Activation in Progress), 
  2) Sync (Synchronization) , and 
  3) Link (successful connection).
If any of these three tests is unsuccessful, the words 
“Link Failed” will show in the screen.
Once a link is established with an ISDN signal, the 
screen will display “Connected” in the main screen. 
For countries where interoperability with the 965DSP 
ISDN Block Error Test has been verified, the [Enter] 
key will appear. Press the [Enter] key to perform an 
Error Test on the active ISDN pair.