3Com MSR 50, MSR 30 manual Ft1 data-coding inverted normal, Undo ft1 data-coding

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Parameter	ami: Adopts AMI line code format.
	b8zs: Adopts B8ZS line code format.
Description	Use the ft1 code command to set the line code format for the T1-F interface.
	Use the undo ft1 code command to restore the default, that is, B8ZS.
	Keep the line code format of the interface in consistency with the one used on the
	remote device.
Example	# Set the line code format of T1-F interface Serial 2/0 to AMI.
	<Sysname> system-view
	[Sysname] interface serial 2/0
	[Sysname-Serial2/0] ft1 code ami
ft1 data-coding
Syntax	ft1 data-coding { inverted normal }
	undo ft1 data-coding
View	T1-F interface view
Parameter	inverted: Enables user data inversion.
	normal: Disables user data inversion.
Description	Use the ft1 data-coding normal command to disable user data inversion for a
	T1-F interface.
	Use the ft1 data-coding inverted command to enable user data inversion for a
	T1-F interface.
	Use the undo ft1 data-codingcommand to restore the default.
	By default, data inversion is disabled.
	To prevent 7e in valid data from being taken for stuffing characters, HDLC inserts a
	zero after every five ones in the data stream. Then, HDLC inverts every one bit into
	a zero and every zero bit into a one. This ensures at least at least one out of every
	eight bits is a one. When AMI encoding is adopted on a T1-F interface, the use of
	data inversion can eliminate presence of multiple consecutive zeros.
	At the two ends of a T1-F line, the same data inversion setting must be adopted.
Example	# Enable user data inversion on T1-F interface Serial 2/0.
	<Sysname> system-view
	[Sysname] interface serial 2/0
	[Sysname-Serial2/0] ft1 data-coding inverted