EXFO FTB-800 Series for FTB-1 - Manual (Page 215)

Test Setup - Test Configurator, Timer, and System
NetBlazer 205
Signal - Signal Configuration (DSn/PDH)
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.
Modify DS0/E0
Modify DS0/E0 button is only available when the DS0/E0 check box is
selected.
Note: For DS0, the framing structure have 23 timeslots. For E0, the framing
structure PCM-30 and PCM30 CRC-4 have 30 channel timeslots while
PCM-31 and PCM-31 CRC-4 have 31 channel timeslots.

DS0/E0 Size sets the channel timeslot data rate for the pattern payload
content to either 56K or 64K (default). A timeslot data rate of 56 Kbit/s
uses 7 bits while 64 Kbit/s uses 8 bits to carry the payload information.

Zero Code Suppression allows the selection of the Zero Code
Suppression (ZCS) method used to replace the all-zero bytes of the Idle
and Tone payload contents. The ZCS mechanism is a global parameter
meaning that all channel timeslots configured with Tone/Idle data, use
the same ZCS method. Choices are: