4.6.4. ZeroCodeSuppression (Zero Code Suppression)

Parameter Number: 0x1604

Description: The ZeroCodeSuppression parameter is an algorithm used by T-1 lines that inserts a 1 bit into a stream to prevent the transmission of eight or more consecutive 0 bits, which could produce timing errors. Instead, this algorithm maintains a minimum one's density to reduce timing errors.

The ZeroCodeSuppression parameter is used when AMI line-coding is used, that is, when the Coding parameter is set to AMI. Since AMI does not perform zero code suppression, the ZeroCodeSuppression parameter ensures there are no long strings of consecutive zeros on the line.

If the Coding parameter is set to B8ZS or HDB3 (for E-1), then zero code suppression is performed by the line-coding and the ZeroCodeSuppression parameter is ignored.

Values:

• 10 = Bell - Bell zero code suppression (Jam Bit 7)
• 11 = GTE - GTE zero code suppression (Jam Bit 8, except in signaling frames when Jam Bit 7 is used if the signaling bit is 0)
• 12 = DDS - Digital Data Service zero code suppression (data byte is replaced with 10011000)
• 13 = None - No zero code suppression is used.

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