3M 965DSP-B instruction manual Isdn

ISDN

Use this function to detect a 2B1Q ISDN signal on a pair, and to measure near-end and far-end errors on an active ISDN line.

2B1Q ISDN is sometimes called NI (National Implementation) ISDN.

Note: the 965DSP-B will not detect older ISDN formats (such as ATT AMI, NTI AMI, etc.).

Connect the Red and Black leads to the pair and press the [Enter] key. The 965DSP-B displays the word “Connecting” while the test set 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” show in the screen.

Once a link is established with an ISDN signal, the screen will display “Link Completed” in the main screen and “Error Test” at the bottom.

Press the [Enter] key to perform an Error Test on the active pair.

29