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EXFO FTB-8100 Series Transport Blazer for FTB-200 User Manual

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DSn Tabs

SONET/SDH Application

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DS0/64K TX

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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).