EXFO FTB-8510B Guia Del Usuario página 921

DSn Tabs
DS0/64K TX
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 None, Jammed Bit 8, GTE, and
BELL. The default setting is None.
None: No Zero Code Suppression
Jammed Bit 8: Every 8th (LSB) bit is forced to 1.
GTE: Bit 8 of an all zero channel byte is replaced by 1, except in
signaling frames where bit 7 is forced to 1.
Bell: Bit 7 of an all zero channel byte is replaced by 1.
Note: Bit 8 is the Least-Significant Bit (LSB) and bit 1 is the Most-Significant Bit
(MSB).
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SONET/SDH Application