| Description | This variable describes the variety of Zero
Code Suppression used on the link, which in
turn affects a number of its characteristics.
dsx1JBZS(1): refers the Jammed Bit Zero suppression
in which the AT&T specification of at
least one pulse every 8 bit periods is
literally implemented by forcing a pulse
in bit 8 of each channel. Thus, only seven
bits per chan- nel, or 1.344 Mbps, is available
for data.
dsx1B8ZS(2): 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.
E1 links, with or without CRC, use dsx1HDB3 or
dsx1AMI.
dsx1AMI(4): 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.
The default value for T1 is 'dsx1JBZS' and for E1
is 'dsx1HDB3'.
This field is not applicable for FRSM-VHS cards
and is set to notUsed(5). |