BRI-PORT (ISDN-BRI Port), ABRI-PORT (ASAI
ISDN-BRI Port)
Issue 4 May 2002
10-279 555-233-123
The dotted lines in Figure 10-8 show how a Loop Around Test is performed for the
B-channels. The figure shows a terminal connected to a BRI line board using a
TN556. If a TN2198 is used, the terminal would be connected to a NT1, and the
NT1 to the BRI board.
Figure 10-8. Path of the BRI Port Local TDM Loop Around
Tone
Generator
Tone
Detector
BRI Line
Board
TDM Bus
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