EXFO FTB/IQS-88000 Series Power Blazer for FTB-2/2Pro/500/IQS-600 - Manual (Page 220)

Test Setup - Test Configurator, Timer, and System
208 FTB/IQS-88000 Series
Signal - Signal Configuration (DSn/PDH)
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:
ZCS Description Available with
None a
a. Default value.
No Zero Code Suppression DS0 and E0
Jammed Bit 8 Every 8th (LSB) bit is forced to 1. DS0 and E0
GTE Bit 8 of an all zero channel byte is replaced by
1, except in signaling frames where bit 7 is
forced to 1. DS0
Bell Bit 7 of an all zero channel byte is replaced by
1. DS0