This variable describes the variety of Zero Code Suppression used on this interface, which in turn affects a number of its characteristics.

dsx1JBZS refers the Jammed Bit Zero Suppression, in which the AT&T specification of at least one pulse every 8-bit period is literally implemented by forcing a pulse in bit 8 of each channel. Thus, only 7 bits per channel, or 1.344 Mbps, are available for data.

dsx1B8ZS refers to the use of a specified pattern of normal bits and bipolar violations that are used to replace a sequence of 8 zero bits. ANSI Clear Channels may use dsx1ZBTSI, or Zero Byte Time Slot Interchange.

E1 links, with or without CRC, use dsx1HDB3 or dsx1AMI.

dsx1AMI refers to a mode wherein no Zero Code Suppression is present and the line encoding does

not solve the problem directly. In this application, the higher layer must provide data that meets or exceeds the pulse density requirements, such as inverting HDLC data.

dsx1B6ZS refers to the user of a specified pattern of normal bits and bipolar violations that are used to replace a sequence of 6 zero bits. Used for DS2. For more information about line coding see [ANSI-T1.102]