EXFO FTB/IQS-88000 Series Power Blazer for FTB-2/2Pro/500/IQS-600 - Manual (Page 219)

Test Setup - Test Configurator, Timer, and System
Power Blazer 207
Signal - Signal Configuration (DSn/PDH)
Background
For multiplex test case, allows the selection of the default timeslot
background traffic: AIS (default) or All Zeros.
The diagram above shows a test case defined with DSn/PDH traffic where
the background traffic is also inserted for the unused timeslots in a test
case data path. The insertion is similar to the low order path SONET/SDH
terminated signal where the background traffic format inserted uses the
same rate as the one defined in the test case data path.
Channel
Channel, for multiplex text case, allows the selection of the channel
number of the mapped signal.
DS0/E0
DS0/E0 check box when selected, cleared by default, activates the DS0/E0
testing. DS0/E0 configuration is not available when the framing is set to
Unframed. Once selected, a summary of the payload content is displayed
indicating the number of timeslot set to Pattern and Idle/Tone. The Modify
DS0/E0 button is also displayed.