This variable describes the variety of Zero Code
Suppression used on this interface, which in turn
affects a number of its characteristics.
b8zs refers to the use of a specified pattern
of normal bits and bipolar violations which are
used to replace a sequence of eight zero bits.
ami 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
which meets or exceeds the pulse density
requirements, such as inverting HDLC data.